Hirpa Gelgele Lemu

Professor

Hirpa Gelgele Lemu

Kontakt

Telefon: 5183 2173 / +4797669570

E-post: hirpa.g.lemu@uis.no

Rom: KE E-239

Organisasjonsenhet

Det teknisk- naturvitenskapelige fakultet

Institutt for maskin, bygg og materialteknologi

Kort om meg

Dr. Hirpa G. Lemu is a professor of Mechanical Engineering at University of Stavanger, Department of Mechanical & Structural Engineering and Materials Technology. Dr. Lemu's  research areas focus on simulation driven design approach, design optimization, design for additive manufacturing, additive manufacturing technologies, composite materials and natural fibers, modeling and simulation of mechanical systems and material behavior characterization. He has served as research group leader of the Mechanical and Materials Engineering group at his department for several years, where developing study programs and the curriculum have been part of his main responsibilities. Currently, Dr. Lemu is the chairperson of national organ for mechanical and structural discipline whose responsibilities include advisory support in definition of learning outcomes for study programs in mechanical and structural engineering disciplines. Among recent achievements, he founded a 3D Printing lab at UiS and this lab is currently equipped with diverse 3D printers of thermoplastic, composite and metallic materials and 3D scanning tools. Dr. Lemu has been the main initiator and coordinator of an international conference organized at University of Stavanger entitled “Computational Methods in Offshore Technology”. The conference was organized in November 2019 for the second time and attracted publications from 20 different countries and will be organized every other year. He is also the initiator and faculty advisor of two student teams working on problem-based learning projects, ION Racing and UiS Subsea, who design and build Formula 1 like racecar and underwater robot respectively, for participation in annual competition of engineering students at international level. Dr. Lemu has served as member of several recruitment committees in Norway and member of PhD evaluation committee for over 15 PhD candidates at different institutions in Norway and other countries in Europe and Asia. He has published and co-published over 150 articles in reputed journals and conference proceedings. Currently, he is serving as an Areal Editor of Journal of Simulation Modelling Practice and Theory (ELSVIER), Guest Editor for Materials journal (MPDI) for a special issue entitled “Advances in Modeling and Analysis of Additive Manufactured Materials”, Reviewer of many International Journals and Scientific Committee member of several International Conferences.

Student Thesis Supervision and PhD Research Leadership

  • Total number of PhDs supervised: 4 graduated and 5 ongoing
  • Total number of supervised MSc thesis: 48
  • Total number of supervised BSc theses: 176

For more info: www.ux.uis.no/~hirpa/
Google Scholar profile

Følg meg på nett

LinkedIn

Publikasjoner

Vitenskapelige publikasjoner

Mesay Alemu Tolcha; Holm Altenbach; Konstantin Naumenko; Hirpa G. Lemu (2026) Computational and experimental investigation of thermodynamic and atomic diffusion behavior in relation to microstructural evolution for Inconel 718 alloy during the wire arc additive manufacturing process. I: Journal of Alloys and Compounds. ISSN 0925-8388. Volum 1050. DOI: 10.1016/j.jallcom.2025.185783

Kinisa Wareso Abesho; Moera Gutu Jiru; Hirpa G. Lemu; Mohammed Abdulkedir Alfeki (2025) Study of mechanical and physical properties of pineapple leaf fiber and coffee husk filler reinforced polymer composite using response surface method. I: Polymer testing. ISSN 0142-9418. Volum 150. s.108915-108915. DOI: 10.1016/j.polymertesting.2025.108915

Fakada Dabalo Gurmesa; Hirpa G. Lemu; Wakshum Mekonnen Tucho; Beruna Baisa Muleta (2025) Impacts of wire diameter on microstructure and hardness of Inconel 625 fabricated by wire arc additive manufacturing. I: Journal of Materials Research and Technology (JMR&T). ISSN 2238-7854. Volum 37. s.5423-5435. DOI: 10.1016/j.jmrt.2025.07.175

Eshetu Tadesse Ymer; Hirpa G. Lemu; Mesay Alemu Tolcha (2025) Identification of the key material degradation mechanisms affecting silicon solar cells: Systematic literature review. I: Results in Engineering (RINENG). Online ISSN 2590-1230. Volum 27. DOI: 10.1016/j.rineng.2025.106113

Leta Yadeta; Hirpa G. Lemu; Addisu K./M. Tadese (2025) Fluid structure interaction induced fatigue stress analysis of multi-stage centrifugal water pump shaft under varying load condition. I: Journal of the Brazilian Society of Mechanical Sciences and Engineering. ISSN 1678-5878. Volum 47. DOI: 10.1007/s40430-025-05703-w

Yadesa Tadese; Dame Ayane; Hirpa G. Lemu (2025) Comparative study of influence of climatic conditions on physio-mechanical properties of sisal fibers and fiber-epoxy composites. I: Results in Materials. Online ISSN 2590-048X. Volum 28. DOI: 10.1016/j.rinma.2025.100769

Tomasz TrzepieciƄski; Marwan T. Mezher; Valmir Dias Luiz; Salah Eddine Laouini; Hirpa G. Lemu (2025) Application of Feed-Forward Neural Networks for Modeling Friction Phenomena with Presence of Vegetable Oil-Based Bio-Lubricants. I: Advances in Materials Science (AMS). ISSN 1730-2439. Volum 25. s.65-65. DOI: 10.2478/adms-2025-0003

Beruna Baisa Muleta; Mesay Alemu Tolcha; Hirpa G. Lemu (2025) Analysis of Boiler Tube Failures and Root Causes Using Macroscopic Characterization Techniques. I: High Temperature Corrosion of Materials. ISSN 2731-8397. Volum 102. DOI: 10.1007/s11085-025-10346-2

Tamana Dabasa; Hirpa G. Lemu; Yohannes Regassa (2025) A Review on the Crashworthiness of Bio-Inspired Cellular Structures for Electric Vehicle Battery Pack Protection. I: Computation. Online ISSN 2079-3197. Volum 13. DOI: 10.3390/computation13090217

Tekalign Lemma Woldassilas; Hirpa G. Lemu; Endalkachew Mosisa Gutema (2025) A DEMATEL method for identifying supply chain complexity drivers of footwear industry. I: Management Science Letters. ISSN 1923-9335. Volum 15. s.167-176. DOI: 10.5267/j.msl.2025.1.001

Tishager Taye Teriya; Hirpa G. Lemu; Endalkachew Mosisa Gutema (2025) Experimental investigation on mechanical properties of 3D printed enset fiber reinforced tough 1500 resin composite. I: Discover Materials. Online ISSN 2730-7727. Volum 6. DOI: 10.1007/s43939-025-00501-6

Yosef Wakjira Adugna; Arturo Cioni; Hirpa G. Lemu; Hanne Røland Hagland (2025) Mechanical and cell attachment evaluation of additively manufactured biomimetic architected scaffolds for tissue engineering. I: Journal of The Mechanical Behavior of Biomedical Materials. ISSN 1751-6161. Volum 173. DOI: 10.1016/j.jmbbm.2025.107237

Yosef Wakjira Adugna; Hanne Røland Hagland; Hirpa G. Lemu (2025) Additive Manufacturing Technologies in Clinical and Tissue Engineering Applications: Workflow Validation, Anatomical Accuracy, Orthopedic Modeling, and Functional Scaffold Design. Universitetet i Stavanger. ISBN 9788284393803.

Abera E. Bekele; Hirpa G. Lemu (2025) Tribological behavior investigation of enset/sisal hybrid reinforced composites. I: Journal of Physics: Conference Series (JPCS). ISSN 1742-6588. Volum 2944. DOI: 10.1088/1742-6596/2944/1/012010

Muleta Tiki Lemi; Hirpa G. Lemu; Endalkachew Mosisa Gutema (2025) Review of Recent Advancements in 3D Printing Technologies for Textile Applications. I: Textile & Leather Review. ISSN 2623-6257. Volum 8. s.72-104. DOI: 10.31881/TLR.2024.169

Tekalign Lemma; Endalkachew Mosisa Gutema; Hirpa G. Lemu; Mahesh Gopal (2025) A Structural Equation Model For Adopting Additive Manufacturing in the Footwear Firms Supply Chains. I: Brazilian Journal of Operations & Production Management (BJO&PM). ISSN 1679-8171. Volum 22. DOI: 10.14488/BJOPM.2322.2025

Fakada Dabalo Gurmesa; Hirpa G. Lemu; Wakshum Mekonnen Tucho; Adugna Deressa Akessa (2025) Effects of wire diameter on mechanical and microstructural properties of Inconel 625 fabricated by wire arc additive manufacturing. I: Journal of Materials Research and Technology (JMR&T). ISSN 2238-7854. Volum 35. s.3226-3235. DOI: 10.1016/j.jmrt.2025.02.025

Debela Negassa Gurmu; Krzysztof WacƂawiak; Hirpa G. Lemu (2025) Predicting the Compressive Properties of Carbon Foam Using Artificial Neural Networks. I: Materials. Online ISSN 1996-1944. Volum 18. DOI: 10.3390/ma18112516

Naol Dessalegn Dejene; Wakshum Mekonnen Tucho; Hirpa G. Lemu (2025) Effects of Scanning Strategies, Part Orientation, and Hatching Distance on the Porosity and Hardness of AlSi10Mg Parts Produced by Laser Powder Bed Fusion. I: Journal of Manufacturing and Materials Processing (JMMP). Online ISSN 2504-4494. Volum 9. DOI: 10.3390/jmmp9030078

Alemu Merga; Endalkachew Mosisa Gutema; Mahesh Gopal; Hirpa G. Lemu (2025) Numerical Simulation of Temperature Distribution and Residual Stress in Laser Beam Welding AA6061 and Ti-6Al-4V and Optimization of Welding Processes. I: Recent Patents on Engineering. ISSN 1872-2121. Volum 19. DOI: 10.2174/0118722121310962240605094216

Endalkachew Mosisa Gutema; Mahesh Gopal; Hirpa G. Lemu (2025) Tribological Study of Multi-Walled Carbon Nanotube-Reinforced Aluminum 7075 Using Response Surface Methodology and Multi-Objective Genetic Algorithm. I: Journal of Composites Science. Online ISSN 2504-477X. Volum 9. DOI: 10.3390/jcs9030137

Bethelehem Burju Bukate; Hirpa G. Lemu; Femi Emmanuel Olu; Mesay Alemu Tolcha; Antony Joseph; Chandra Sekhar Tiwary (2025) Cellulose fiber (palm fiber and teff straw) reinforced 3D printed composites with enhanced fracture resistance. I: Materials Today Communications. Online ISSN 2352-4928. Volum 46. DOI: 10.1016/j.mtcomm.2025.112944

Mesay Alemu Tolcha; Hirpa G. Lemu; Yosef Wakjira Adugna (2025) Optimizing economics of machining for LM25Al/VC composite material using analytical modeling, deep neural network and GRA coupled with RSM. I: Scientific Reports. Online ISSN 2045-2322. Volum 15. DOI: 10.1038/s41598-025-95446-4

Dame Alemayehu Efa; Endalkachew Mosisa Gutema; Hirpa G. Lemu; Mahesh Gopal (2024) Friction stir-welding of AZ31B Mg and 6061-T6 Al alloys optimization using Box-Behnken design (BBD) and Artificial Neural network (ANN). I: Research on Engineering Structures and Materials (RESM). ISSN 2148-9807. Volum 10. s.413-430. DOI: 10.17515/resm2023.50ma0703rs

Adugna Deressa Akessa; Hirpa G. Lemu (2024) Experimental study of mechanical properties and numerical simulation of 3D printed carbon fiber reinforced polymer composites. I: Ove Tobias Gudmestad; Hirpa G. Lemu; Idriss El-Thalji; Tiago Fazeres-Ferradosa; Mudiyan Nirosha Damayanthi Adasooriya; Sudath C. Siriwardane; Andreas Delimitis; Jayantha Prasanna Liyanage; Vidar Folke Hansen; José A.F.O. Correia; Samarakoon Mudiyansele Samindi Samarakoon; Chandima RATNAYAKE MUDIYANSELAGE; Gerhard Ersdal; Tor Hemmingsen; Mona Wetrhus Minde; Dimitrios Pavlou, Analytical and experimental methods in mechanical and civil engineering : Contributions of the 1st olympiad in engineering science (OES 2023). Springer Nature. ISBN 9783031497223. s.97-110. DOI: 10.1007/978-3-031-49723-0_8

Dame Alemayehu Efa; Endalkachew Mosisa Gutema; Hirpa G. Lemu; Mahesh Gopal (2024) Optimization of Titanium Alloy- Ti-6Al-4V to Minimize Mass, Maximize Stiffness and Frequency in Additive Manufacturing. I: Key Engineering Materials. ISSN 1013-9826. Volum 980. s.3-13. DOI: 10.4028/p-sO6M4z

Dame Alemayehu Efa; Endalkachew Mosisa Gutema; Hirpa G. Lemu; Mahesh Gopal (2024) Modeling and Simulation of Friction Stir Welding of Aluminum and Magnesium Alloys Using Finite Element Analysis. I: Key Engineering Materials. ISSN 1013-9826. Volum 980. s.15-29. DOI: 10.4028/p-47WKMs

Dame Alemayehu Efa; Hirpa G. Lemu; Endalkachew Mosisa Gutema; Mahesh Gopal (2024) Analyzing the Effect of Temperature on Alloy Steel Forging Simulation Using Finite Element Simulation. I: Key Engineering Materials. ISSN 1013-9826. Volum 979. s.81-92. DOI: 10.4028/p-A6inH6

Tsegaye Amare; Balkeshwar Singh; Guteta Kabeta; Moera G. Jiru; Hirpa G. Lemu (2024) Structural Equation Modeling of Relationships Among Lean Operational, Financial Performance, and Customer Satisfaction. I: Indian Journal of Science and Technology. ISSN 0974-6846. Volum 17. s.1606-1620. DOI: 10.17485/IJST/v17i15.3016

Atomsa D. Hirpa; Endalkachew Mosisa Gutema; Hirpa G. Lemu; Mahesh Gopal (2024) Comparative Study of Machining Parameters of Single and Double Cutting Tools During Turning of AISI 1045 Steel. I: Recent Patents on Engineering. ISSN 1872-2121. Volum 19. DOI: 10.2174/0118722121310810240621095952

Mesay Alemu Tolcha; Hirpa G. Lemu (2024) Modeling thermo-mechanical fatigue for rolling die under continuous casting process. I: Results in Engineering (RINENG). Online ISSN 2590-1230. Volum 23. DOI: 10.1016/j.rineng.2024.102577

Abera Endesha Bekele; Hirpa G. Lemu (2024) Evaluating the Hybridization and Treatment Effects on the Mechanical Properties of Enset and Sisal Hybrid Composites. I: Journal of Composites Science. Online ISSN 2504-477X. Volum 8. DOI: 10.3390/jcs8090377

Edosa K. Tesema; Hirpa G. Lemu (2024) Topology Optimization of Plastic Shredding Machine Blade Carriage. I: Yi Wang; Tao Yu; Kesheng Wang, IWAMA 2023: International Workshop of Advanced Manufacturing and Automation XIII. Springer. ISBN 9789819706655. s.687-694. DOI: 10.1007/978-981-97-0665-5_84

Weynishet D. Kelbessa; Firankor T. Daba; Hirpa G. Lemu (2024) Effect of Fiber Orientation on Water Absorption and Hardness of Lowland Bamboo Fiber Reinforced Composite. I: Yi Wang; Tao Yu; Kesheng Wang, IWAMA 2023: International Workshop of Advanced Manufacturing and Automation XIII. Springer. ISBN 9789819706655. s.695-702. DOI: 10.1007/978-981-97-0665-5_85

Fakada Dabalo Gurmesa; Hirpa G. Lemu; Yosef Wakjira Adugna; Mesfin Demise Harsibo (2024) Residual Stresses in Wire Arc Additive Manufacturing Products and Their Measurement Techniques: A Systematic Review. I: Applied Mechanics. Online ISSN 2673-3161. Volum 5. s.420-449. DOI: 10.3390/applmech5030025

Yohannes Regassa; Hirpa G. Lemu (2024) Damage assessment of crack growth through numerical modelling and rain flow counting method. I: Georgios C. Georgiou; Yanyan Sha; José A.F.O. Correia; Dimitrios Pavlou; Knut Erik Teigen Giljarhus; Nicholas Fantuzzi; Hojjat Adeji, Advances in Computational Mechanics and Applications. Springer. ISBN 9783031497919. s.268-279. DOI: 10.1007/978-3-031-49791-9_19

Yosef Wakjira Adugna; Navaneethan S. Kurukkal; Hirpa G. Lemu (2024) Anatomical model reconstruction (solid modeling) using a reverse engineering approach. I: Yanyan Sha; Hojjat Adeji; Nicholas Fantuzzi; Dimitrios Pavlou; Knut Erik Teigen Giljarhus; Georgios C. Georgiou; José A.F.O. Correia, Advances in Computational Mechanics and Applications. Springer. ISBN 9783031497919. s.254-267. DOI: 10.1007/978-3-031-49791-9_18

Yosef Wakjira Adugna; Arturo Cioni; Hirpa G. Lemu (2024) Current status of the application of additive-manufactured TPMS structure in bone tissue engineering. I: Progress in Additive Manufacturing. ISSN 2363-9512. DOI: 10.1007/s40964-024-00714-w

Naol Dessalegn Dejene; Hirpa G. Lemu (2024) Characterisation and prediction of mechanical properties in laser powder bed fusion-printed parts: a comparative analysis using machine learning. I: Materials technology (New York, N.Y.). ISSN 1066-7857. Volum 39. DOI: 10.1080/10667857.2024.2419228

Tekalign Lemma; Hirpa G. Lemu; Endalkachew Mosisa Gutema (2024) Studying the Moderating Effects of Additive Manufacturing Best Practices Between Supply Chain Complexity and Its Performance. I: Logistics. Online ISSN 2305-6290. Volum 8. DOI: 10.3390/logistics8040112

Mesay Alemu Tolcha; Hirpa G. Lemu (2024) Parametric optimizing of electro-discharge machining for LM25Al/VC composite material machining using deterministic and stochastic methods. I: The International Journal of Advanced Manufacturing Technology. ISSN 0268-3768. DOI: 10.1007/s00170-024-13221-7

Naol Dessalegn Dejene; Hirpa G. Lemu; Endalkachew Mosisa Gutema (2024) Effects of process parameters on the surface characteristics of laser powder bed fusion printed parts: machine learning predictions with random forest and support vector regression. I: The International Journal of Advanced Manufacturing Technology. ISSN 0268-3768. Volum 133. s.5611-5625. DOI: 10.1007/s00170-024-14087-5

Yosef Wakjira Adugna; Navaneethan S. Kurukkal; Hirpa G. Lemu (2024) Reverse engineering in medical application: literature review, proof of concept and future perspectives. I: Scientific Reports. Online ISSN 2045-2322. Volum 14. DOI: 10.1038/s41598-024-74176-z

Kuleni Fekadu Yadeta; Sudath C. Siriwardane; Tesfaye Alemu Mohammed; Hirpa G. Lemu (2024) Influence of pre-existing cracks and concrete cover on service life of reinforced concrete and mechanical behaviour of corroded rebars. I: International Journal of Structural Integrity. ISSN 1757-9864. Volum 15. s.283-297. DOI: 10.1108/IJSI-12-2023-0139

Tekalign Lemma Woldesilassiea; Hirpa G. Lemu; Endalkachew Mosisa Gutema (2024) Impacts of Adopting Additive Manufacturing Process on Supply Chain: Systematic Literature Review. I: Logistics. Online ISSN 2305-6290. Volum 8. DOI: 10.3390/logistics8010003

Mahesh Gopal; Endalkachew Mosisa Gutema; Hirpa G. Lemu; Jaleta Sori (2024) A Hybrid Nondominant-Based Genetic Algorithm (NSGA-II) for Multiobjective Optimization to Minimize Vibration Amplitude in the End Milling Process. I: Advances in Materials Science and Engineering. ISSN 1687-8434. Volum 2024. DOI: 10.1155/2024/6652973

Yosef Wakjira Adugna; Navaneethan S. Kurukkal; Hirpa G. Lemu (2024) Assessment of the accuracy of 3D printed medical models through reverse engineering. I: Heliyon. Online ISSN 2405-8440. Volum 10. DOI: 10.1016/j.heliyon.2024.e31829

Endalkachew Mosisa Gutema; Hirpa G. Lemu (2024) Conventional Machining of Metal Matrix Composites towards Sustainable Manufacturing—Present Scenario and Future Prospects. I: Journal of Composites Science. Online ISSN 2504-477X. Volum 8. DOI: 10.3390/jcs8090356

Mesay Alemu Tolcha; Tensay Mitikneh Gebrehiwot; Hirpa G. Lemu (2024) Enhancing Mechanical Properties of Cast Ingot Al6061 Alloy Using ECAP Process. I: Journal of materials engineering and performance (Print). ISSN 1059-9495. DOI: 10.1007/s11665-024-09978-3

Kedir Hussen; Hirpa G. Lemu; Amanuel Diriba Tura (2024) Metaheuristic optimization of compressive strength and microstructures for fused deposition modelling using PLA material. I: Hojjat Adeji; Knut Erik Teigen Giljarhus; Nicholas Fantuzzi; José A.F.O. Correia; Georgios C. Georgiou; Dimitrios Pavlou; Yanyan Sha, Advances in Computational Mechanics and Applications. Springer. ISBN 9783031497919. s.155-171. DOI: 10.1007/978-3-031-49791-9_11

Yosef Wakjira Adugna; Heinrich Bruggermann; Erik Sæland Hafnor; Ane Djuv; Aksel Paulsen; Hanne Røland Hagland; Hirpa G. Lemu (2024) Study on how 3D printer process parameters can be optimized for use in orthopedics fracture classification and surgical planning. I: José A.F.O. Correia; Hojjat Adeji; Knut Erik Teigen Giljarhus; Georgios C. Georgiou; Yanyan Sha; Dimitrios Pavlou; Nicholas Fantuzzi, Advances in Computational Mechanics and Applications. Springer. ISBN 9783031497919. s.143-154. DOI: 10.1007/978-3-031-49791-9_10

Temesgen Batu Gemechu; Hirpa G. Lemu (2023) Application of Artificial Intelligence for Surface Roughness Prediction of Additively Manufactured Components. I: Materials. Online ISSN 1996-1944.

Temesgen Batu Gemechu; Hirpa G. Lemu (2023) Application of Composite Materials for Energy Generation Devices. I: Journal of Composites Science. Online ISSN 2504-477X.

L. Yadeta; Hirpa G. Lemu; A.K.M. Tadese (2023) Numerical analysis of centrifugal water pump impeller under varying loads. I: IOP Conference Series: Materials Science and Engineering. ISSN 1757-8981. Volum 1294. DOI: 10.1088/1757-899X/1294/1/012022

Kitesa Akewaq Irena; Hirpa G. Lemu; Yahiya Ahmed Kedir (2023) Effect of Interference Size on Contact Pressure Distribution of Railway Wheel Axle Press Fitting. I: Designs. Online ISSN 2411-9660. Volum 7. DOI: 10.3390/designs7050119

Debela N. Gurmu; Hirpa G. Lemu (2023) Experimental Investigation on Effect of Weight Fraction of Sisal Fiber on Mechanical Properties of Sisal-E-Glass Hybrid Polymer Composites. I: Advances in Materials Science and Engineering. ISSN 1687-8434. Volum 2023. DOI: 10.1155/2023/3948500

Yosef Wakjira Adugna; Hirpa G. Lemu (2023) Comparative evaluation of stress concentration generated on human femur structure using meshfree software. I: Yi Wang; Tao Yu; Kesheng Wang, Advanced Manufacturing and Automation XII. Conference proceedings IWAMA 2022.. Springer. ISBN 9789811993381. s.458-470. DOI: 10.1007/978-981-19-9338-1_56

Fakada Dabalo Gurmesa; Hirpa G. Lemu (2023) Literature Review on Thermomechanical Modelling and Analysis of Residual Stress Effects in Wire Arc Additive Manufacturing. I: Metals. Online ISSN 2075-4701. Volum 13. DOI: 10.3390/met13030526

Abera E. Bekele; Hirpa G. Lemu; Moera G. Jiru (2023) Study of the Effects of Alkali Treatment and Fiber Orientation on Mechanical Properties of Enset/Sisal Polymer Hybrid Composite. I: Journal of Composites Science. Online ISSN 2504-477X. Volum 7. DOI: 10.3390/jcs7010037

Naol Dessalegn Dejene; Hirpa G. Lemu; Endalkachew Mosisa Gutema (2023) Critical Review of Comparative Study of Selective Laser Melting and Investment Casting for Thin-Walled Parts. I: Materials. Online ISSN 1996-1944. Volum 16. DOI: 10.3390/ma16237346

Mahesh Gopal; Hirpa G. Lemu; Endalkachew Mosisa Gutema (2023) Sustainable Additive Manufacturing and Environmental Implications: Literature Review. I: Sustainability. Online ISSN 2071-1050. Volum 15. DOI: 10.3390/su15010504

Naol Dessalegn Dejene; Hirpa G. Lemu (2023) Current Status and Challenges of Powder Bed Fusion-Based Metal Additive Manufacturing: Literature Review. I: Metals. Online ISSN 2075-4701. Volum 13. DOI: 10.3390/met13020424

Mesay Alemu Tolcha; Hirpa G. Lemu (2023) Utilizing multiple criteria decision-making optimization methods to machine LM25Al/VC material under electro-discharge machining processes. I: IOP Conference Series: Materials Science and Engineering. ISSN 1757-8981. Volum 1294. DOI: 10.1088/1757-899X/1294/1/012049

Temesgen Batu; Hirpa G. Lemu; Hailu Shimels (2023) Application of Artificial Intelligence for Surface Roughness Prediction of Additively Manufactured Components. I: Materials. Online ISSN 1996-1944. Volum 16. DOI: 10.3390/ma16186266

Enes Hacihamud; K Dahl; O. Gabrielsen; Hirpa G. Lemu; Sudath C. Siriwardane (2023) Non-linear buckling analysis of ship hull stiffened panels. I: IOP Conference Series: Materials Science and Engineering. ISSN 1757-8981. Volum 1294. DOI: 10.1088/1757-899X/1294/1/012030

Amanuel Tura; Hirpa G. Lemu; Lingerew E Melaku; Hana B. Mamo (2023) Impact of FDM 3D printing parameters on compressive strength and printing weight of PLA components. I: Yi Wang; Tao Yu; Kesheng Wang, Advanced Manufacturing and Automation XII. Conference proceedings IWAMA 2022.. Springer. ISBN 9789811993381. s.495-504. DOI: 10.1007/978-981-19-9338-1_60

Yohannes Regassa; T. Dabasa; G. Amare; Hirpa G. Lemu (2023) Bio-inspired design trends for sustainable energy structures. I: IOP Conference Series: Materials Science and Engineering. ISSN 1757-8981. Volum 1294. DOI: 10.1088/1757-899X/1294/1/012044

Tekalign Lemma; Hirpa G. Lemu; Endalkachew Mosisa Gutema (2023) Assessment of awareness levels towards additive manufacturing best practices in transforming traditional manufacturing: A case study in Ethiopian context. I: IOP Conference Series: Materials Science and Engineering. ISSN 1757-8981. Volum 1294. DOI: 10.1088/1757-899X/1294/1/012045

Temesgen Batu; Hirpa G. Lemu; H.G. Shimels; M. Zebenay (2023) Process parameter modelling and optimization techniques applied to fused deposition modelling: A review. I: IOP Conference Series: Materials Science and Engineering. ISSN 1757-8981. Volum 1294. DOI: 10.1088/1757-899X/1294/1/012047

Tamana Dabasa; Hirpa G. Lemu; Yohannes Regassa (2023) Literature review on thin-walled and cellular structure designs for energy absorption. I: IOP Conference Series: Materials Science and Engineering. ISSN 1757-8981. Volum 1294. DOI: 10.1088/1757-899X/1294/1/012046

Tekalign Lemma; Endalkachew Mosisa Gutema; Hirpa G. Lemu (2023) Additive manufacturing best practices and its impact on supply chain performance through structural equation modelling: A case study in Ethiopian footwear industry. I: IOP Conference Series: Materials Science and Engineering. ISSN 1757-8981. Volum 1294. DOI: 10.1088/1757-899X/1294/1/012052

Yosef Wakjira Adugna; Hirpa G. Lemu; Hanne Røland Hagland (2023) Triply periodic minimal surfaces based functionally graded biomimetic scaffold fabrication via stereolithography. I: IOP Conference Series: Materials Science and Engineering. ISSN 1757-8981. Volum 1294. DOI: 10.1088/1757-899X/1294/1/012051

Tomasz TrzepieciƄski; Temesgen Batu; Fasikaw Kibrete; Hirpa G. Lemu (2023) Application of Composite Materials for Energy Generation Devices. I: Journal of Composites Science. Online ISSN 2504-477X. Volum 7. DOI: 10.3390/jcs7020055

Yahiya Ahmed Kedir; Hirpa G. Lemu (2023) Prediction of Fatigue Crack Initiation under Variable Amplitude Loading: Literature Review. I: Metals. Online ISSN 2075-4701. Volum 13. DOI: 10.3390/met13030487

Endalkachew Mosisa Gutema; Mahesh Gopal; Hirpa Gelgele Lemu (2022) Temperature Optimization by Using Response Surface Methodology and Desirability Analysis of Aluminium 6061. I: Materials. Online ISSN 1996-1944. Volum 15. DOI: 10.3390/ma15175892

Abera E. Bekele; Hirpa Gelgele Lemu; Moera G. Jiru (2022) Exploration of Mechanical Properties of Enset–Sisal Hybrid Polymer Composite. I: Fibers. Online ISSN 2079-6439. Volum 10. DOI: 10.3390/fib10020014

Tomasz TrzepieciƄski; Sherwan Mohammed Najm; Hirpa Gelgele Lemu (2022) Current Concepts for Cutting Metal-Based and Polymer-Based Composite Materials. I: Journal of Composites Science. Online ISSN 2504-477X. Volum 6. DOI: 10.3390/jcs6050150

Øyvind Karlsen; Hirpa G. Lemu; Imad Berkani (2022) An investigation of the effects and consequences of combining Expanding Dual Pin with radial spherical plain bearings. I: Applied Mechanics. Online ISSN 2673-3161. Volum 3. s.573-589. DOI: 10.3390/applmech3020034

Mesay A. Tolcha; Getasew Andargie Ademe; Yohanis D. Jelila; Moera G. Jiru; Hirpa G. Lemu (2022) Analyzing the effect of vibration on crack growth on shaft using fuzzy logic. I: Meccanica (Milano. Print). ISSN 0025-6455. DOI: 10.1007/s11012-022-01609-2

Soheil Salahshour Langeroodi; Øyvind Karlsen; Hirpa G. Lemu (2022) Experimental and Numerical Studies of Stress Distribution in an Expanding Pin Joint System. I: Applied Mechanics. Online ISSN 2673-3161. Volum 3. s.46-63. DOI: 10.3390/applmech3010003

Samrawit A Tewelde; Hirpa G. Lemu; Jonathan B Dawit (2022) Mechanical property characterization of water hyacinth and glass fiber reinforced hybrid composite. I: Materials Today: Proceedings. Online ISSN 2214-7853. Volum 62. s.6445-6449. DOI: 10.1016/j.matpr.2022.04.115

Øyvind Karlsen; Hirpa G. Lemu; Imad Berkani (2022) A Novel Technique for Temporarily Repair and Improvement of Damaged Pin Joint Support Bores. I: Applied Mechanics. Online ISSN 2673-3161. Volum 3. s.1206-1222. DOI: 10.3390/applmech3040069

Abdulbasit Mohammed; Belete Sirahbizu; Hirpa Gelgele Lemu (2022) Optimal Rotary Wind Turbine Blade Modeling with Bond Graph Approach for Specific Local Sites. I: Energies. Online ISSN 1996-1073. Volum 15. DOI: 10.3390/en15186858

Amanuel Diriba Tura; Hirpa Gelgele Lemu; Hana Beyene Mamo; A. Johnson Santhosh (2022) Prediction of tensile strength in fused deposition modeling process using artificial neural network and fuzzy logic. I: Progress in Additive Manufacturing. ISSN 2363-9512. DOI: 10.1007/s40964-022-00346-y

Berhanu Tolessa Amena; Holm Altenbach; Getachew Shunki Tiba; Hirpa G. Lemu (2022) Analysis Of the Negative Impacts of Coffee Husk on The Local Environment Of Ethiopia. I: European Chemical Bulletin (ECB). Online ISSN 2063-5346. Volum 11. s.18-26. DOI: 10.31838/ecb/2022.11.11.003

Desalegn A. Yeshanew; Moera G. Jiru; Hirpa Gelgele Lemu; Mesay A. Tolcha (2022) Internal Corrosion Damage Mechanisms of the Underground Water Pipelines. I: Advances in Science and Technology Research Journal. Online ISSN 2299-8624. Volum 16. s.111-123. DOI: 10.12913/22998624/149369

Getachew A. Ambaye; Hirpa Gelgele Lemu; Mesay A. Tolcha (2022) Contact temperature analysis of the classical Geneva mechanism through numerical methods. I: Materials Today: Proceedings. Online ISSN 2214-7853. Volum 57. s.545-552. DOI: 10.1016/j.matpr.2022.01.420

Yohannes Regassa; Jema Gari; Hirpa Gelgele Lemu (2022) Composite Overwrapped Pressure Vessel Design Optimization Using Numerical Method. I: Journal of Composites Science. Online ISSN 2504-477X. Volum 6. DOI: 10.3390/jcs6080229

Amanuel Diriba Tura; Hirpa Gelgele Lemu; Hana Beyene Mamo (2022) Experimental Investigation and Prediction of Mechanical Properties in a Fused Deposition Modeling Process. I: Crystals. Online ISSN 2073-4352. Volum 12. DOI: 10.3390/cryst12060844

Øyvind Karlsen; Hirpa Gelgele Lemu (2022) Comparative study on loosening of anti-loosening bolt and standard bolt system. I: Engineering Failure Analysis. ISSN 1350-6307. Volum 140. DOI: 10.1016/j.engfailanal.2022.106590

Adugna Deressa Akessa; Wakshum Mekonnen Tucho; Hirpa Gelgele Lemu; Jørgen Grønsund (2022) Investigations of the Microstructure and Mechanical Properties of 17-4 PH ss Printed Using a MarkForged Metal X. I: Materials. Online ISSN 1996-1944. Volum 15. DOI: 10.3390/ma15196898

Abera E. Bekele; Hirpa Gelgele Lemu; Moera G. Jiru (2022) Study of Machinability in Drilling Operation of Enset–Sisal Hybrid Polyester Composite. I: Journal of Composites Science. Online ISSN 2504-477X. Volum 6. DOI: 10.3390/jcs6070205

Getachew A. Ambaye; Hirpa Gelgele Lemu (2022) Numerical stress analysis and fatigue life prediction of the classical external Geneva mechanism. I: Tao Yu; Yi Wang; Kesheng Wang; Kristian Martinsen, Advanced Manufacturing and Automation XI Conference proceedings IWAMA 2021. Springer. ISBN 9789811905728. s.176-186. DOI: 10.1007/978-981-19-0572-8_23

Jonathan B. Dawit; Hirpa Gelgele Lemu; Samrawit A. Tewelde (2022) Tensile and Flexural Properties of Acacia Tortilis/Glass Fiber Reinforced Hybrid Composites. I: Kristian Martinsen; Kesheng Wang; Tao Yu; Yi Wang, Advanced Manufacturing and Automation XI Conference proceedings IWAMA 2021. Springer. ISBN 9789811905728. s.187-197. DOI: 10.1007/978-981-19-0572-8_24

Welteji Bena; Hirpa Gelgele Lemu (2022) Analysis of Thermomechanical Cracks of Disc Brake Used in Heavy Trucks. I: International Review of Mechanical Engineering (IREME). ISSN 1970-8734. Volum 16. s.365-372. DOI: 10.15866/ireme.v16i7.22331

Endalkachew Mosisa Gutema; Mahesh Gopal; Hirpa Gelgele Lemu (2022) Minimization of Surface Roughness and Temperature during Turning of Aluminum 6061 Using Response Surface Methodology and Desirability Function Analysis. I: Materials. Online ISSN 1996-1944. Volum 15. DOI: 10.3390/ma15217638

Frankor T. Daba; Hirpa Gelgele Lemu (2022) Conceptual modelling and topology optimization framework of tower crane hook: A case study. I: Kristian Martinsen; Kesheng Wang; Tao Yu; Yi Wang, Advanced Manufacturing and Automation XI Conference proceedings IWAMA 2021. Springer. ISBN 9789811905728. s.531-539. DOI: 10.1007/978-981-19-0572-8_68

Yohannes Regassa; Hirpa Gelgele Lemu; Belete Sirabizuh (2021) Nature inspired design in fiber orientation trends for reinforcement of composites. I: Addisu Negash Ali; Solomon Workneh Fanta; Mekuanint Agegnehu Bitew; Abebech Abera Beyene; Mulugeta Admasu Delele, Advances of Science and Technology : 8th EAI International Conference : ICAST 2020, Bahir Dar, Ethiopia, October 2-4, 2020 : Proceedings : Part II. Springer. ISBN 9783030806170. s.382-394. DOI: 10.1007/978-3-030-80618-7_26

Yohannes Regassa; Hirpa G. Lemu; Belete Sirhabizu (2021) Investigation of spider web oriented composite fabrics burst strength. I: AIMS Materials Science. Online ISSN 2372-0484. Volum 8. s.622-639. DOI: 10.3934/matersci.2021038

Nigato D. Tilahun; Hirpa Gelgele Lemu (2021) Mechanical vibration analysis of fiber reinforced polymer composite beams using analytical and numerical methods. I: Mulugeta Admasu Delele; Solomon Workneh Fanta; Abebech Abera Beyene; Mekuanint Agegnehu Bitew; Addisu Negash Ali, Advances of Science and Technology : 8th EAI International Conference : ICAST 2020, Bahir Dar, Ethiopia, October 2-4, 2020 : Proceedings : Part II. Springer. ISBN 9783030806170. s.357-369. DOI: 10.1007/978-3-030-80618-7_24

Temesgen Batu; Hirpa G. Lemu (2021) Fatigue life study of false banana/glass fiber reinforced composite for wind turbine blade application. I: Kristian Martinsen; Yi Wang; Tao Yu; Kesheng Wang, Advanced manufacuring and automation X. Springer Nature. ISBN 9789813363175. s.29-40. DOI: 10.1007/978-981-33-6318-2_4

Muhammad Maaz Akhtar; Øyvind Karlsen; Hirpa Gelgele Lemu (2021) Study of Bondura® Expanding PIN System – Combined Axial and Radial Locking System. I: Strojniski vestnik. ISSN 0039-2480. Volum 67. s.625-634. DOI: 10.5545/SV-JME.2021.7306

Robin Heimli Helle; Hirpa Gelgele Lemu (2021) A case study on use of 3D scanning for reverse engineering and quality control. I: Materials Today: Proceedings. Online ISSN 2214-7853. Volum 45. s.5255-5262. DOI: 10.1016/j.matpr.2021.01.828

Temesgen Batu; Hirpa Gelgele Lemu; Elias G. Michael (2021) Multi objective parametric optimization and composite material performance study for master leaf spring. I: Materials Today: Proceedings. Online ISSN 2214-7853. Volum 45. s.5347-5353. DOI: 10.1016/j.matpr.2021.01.925

Hirpa Gelgele Lemu; Ove Mikkelsen (2021) Experience in Use of 3D Printing in Engineering Education at University of Stavanger. I: Nordic Journal of STEM Education. Online ISSN 2535-4574. Volum 5. DOI: 10.5324/njsteme.v5i1.3934

Getachew A. Ambaye; Hirpa G. Lemu (2021) Effect of backlash on transmission error and time varying mesh stiffness. I: Yi Wang; Tao Yu; Kristian Martinsen; Kesheng Wang, Advanced manufacuring and automation X. Springer Nature. ISBN 9789813363175. s.18-28. DOI: 10.1007/978-981-33-6318-2_3

Yohanis D. Jelila; Hirpa G. Lemu (2021) Study of wheel-rail contacts at railway turnout using multibody dynamics simulation approach. I: Yi Wang; Kesheng Wang; Tao Yu; Kristian Martinsen, Advanced manufacuring and automation X. Springer Nature. ISBN 9789813363175. s.371-379.

Mesay Alemu Tolcha; Moera Gutu Jiru; Hirpa Gelgele Lemu (2021) Experimental Investigation of Al-CuMgMn Alloy Developed by Laser Beam Surface Modification for Wear Resistance. I: Metals. Online ISSN 2075-4701. Volum 11. s.1-15. DOI: 10.3390/met11050712

Yohannes Regassa; Hirpa Gelgele Lemu; Belete Sirabizuh; Samuel Rahimeto (2021) Studies on the Geometrical Design of Spider Webs for Reinforced Composite Structures. I: Journal of Composites Science. Online ISSN 2504-477X. Volum 5. s.57-57. DOI: 10.3390/jcs5020057

Abera E. Bekele; Hirpa G. Lemu; Moera G. Jiru (2021) Experimental study of physical, chemical and mechanical properties of enset and sisal fibers. I: Polymer testing. ISSN 0142-9418. Volum 106. DOI: 10.1016/j.polymertesting.2021.107453

Samrawit Alemyayehu; Yohannes Regassa; Bisrath Yoseph; Hirpa Gelgele Lemu (2021) Mechanical properties characterization of water hyacinth (Emboch) plant for use as fiber reinforced polymer composite. I: Mulugeta Admasu Delele; Abebech Abera Beyene; Solomon Workneh Fanta; Addisu Negash Ali; Mekuanint Agegnehu Bitew, Advances of Science and Technology : 8th EAI International Conference : ICAST 2020, Bahir Dar, Ethiopia, October 2-4, 2020 : Proceedings : Part II. Springer. ISBN 9783030806170. s.482-492. DOI: 10.1007/978-3-030-80618-7_33

Abdulbasit Mohammed; Hirpa Gelgele Lemu; Belete Sirahbizu (2021) Statistical analysis of Ethiopian wind power potential at selected sites. I: Mulugeta Admasu Delele; Solomon Workneh Fanta; Abebech Abera Beyene; Addisu Negash Ali; Mekuanint Agegnehu Bitew, Advances of Science and Technology : 8th EAI International Conference : ICAST 2020, Bahir Dar, Ethiopia, October 2-4, 2020 : Proceedings : Part II. Springer. ISBN 9783030806170. s.370-381. DOI: 10.1007/978-3-030-80618-7_25

Yosef Wakjira Adugna; Adugna Deressa Akessa; Hirpa G. Lemu (2021) Overview study on challenges of additive manufacturing for a healthcare application. I: IOP Conference Series: Materials Science and Engineering. ISSN 1757-8981. Volum 1201. DOI: 10.1088/1757-899X/1201/1/012041

Bao Gia Ngoc Nguyen; Hirpa G. Lemu; Ole Gabrielsen; Idriss El-Thalji (2021) Characterization of acoustic emission signals under 3-point bending test. I: IOP Conference Series: Materials Science and Engineering. ISSN 1757-8981. Volum 1201. DOI: 10.1088/1757-899X/1201/1/012034

Iyasu T Jiregna; Hirpa G. Lemu (2021) Thermal stress analysis of disc brake using analytical and numerical methods. I: IOP Conference Series: Materials Science and Engineering. ISSN 1757-8981. Volum 1201. DOI: 10.1088/1757-899X/1201/1/012033

Tomasz TrzepieciƄski; Sherwan M Najm; Manel Sbayti; Hedi Belhadjsalah; Marcin Szpunar; Hirpa G. Lemu (2021) New Advances and Future Possibilities in Forming Technology of Hybrid Metal–Polymer Composites Used in Aerospace Applications. I: Journal of Composites Science. Online ISSN 2504-477X. Volum 5. DOI: 10.3390/jcs5080217

Tomasz TrzepieciƄski; Hirpa G. Lemu; Ɓukasz ChodoƂa; Daniel Ficek (2021) Modelling Anisotropic Phenomena of Friction of Deep-Drawing Quality Steel Sheets Using Artificial Neural Networks. I: Advances in Materials Science (AMS). ISSN 1730-2439. Volum 21. DOI: 10.2478/adms-2021-0016

Bruno Villoria; Sudath C. Siriwardane; Hirpa G. Lemu (2021) Review on fatigue life assessment methods for welded joints in orthotropic steel decks of long-span bridges. I: IOP Conference Series: Materials Science and Engineering. ISSN 1757-8981. Volum 1201. DOI: 10.1088/1757-899X/1201/1/012036

Amanuel Tura; Hanna Mamo; Yohannis Jelila; Hirpa G. Lemu (2021) Experimental investigation and ANN prediction for part quality improvement of fused deposition modeling parts. I: IOP Conference Series: Materials Science and Engineering. ISSN 1757-8981. Volum 1201. DOI: 10.1088/1757-899X/1201/1/012031

Øyvind Karlsen; Hirpa G. Lemu (2021) Safety related study of Expanding Pin systems application in lifting and drilling equipment within Construction, Offshore, and Marine sectors. I: IOP Conference Series: Materials Science and Engineering. ISSN 1757-8981. Volum 1201. DOI: 10.1088/1757-899X/1201/1/012026

Goftila Sirata; Hirpa G. Lemu; Krzysztof Waclawiak; Yohanis D. Jelila (2021) Study of rail-wheel contact problem by analytical and numerical approaches. I: IOP Conference Series: Materials Science and Engineering. ISSN 1757-8981. Volum 1201. DOI: 10.1088/1757-899X/1201/1/012035

Yohannes Regassa; Hirpa G. Lemu; Belete Sirhabizu (2021) Burst strength analysis of composite overwrapped pressure vessel using finite element method. I: IOP Conference Series: Materials Science and Engineering. ISSN 1757-8981. Volum 1201. DOI: 10.1088/1757-899X/1201/1/012029

Yohanis D. Jelila; Hirpa G. Lemu; WiesƂaw Pamula; Goftila Sirata (2021) Fatigue life analysis of wheel-rail contacts at railway turnouts using finite element modelling approach. I: IOP Conference Series: Materials Science and Engineering. ISSN 1757-8981. Volum 1201. DOI: 10.1088/1757-899X/1201/1/012047

Tomasz Trzepiecinski; Francesco dell’Isola; Hirpa G. Lemu (2021) Multiphysics Modeling and Numerical Simulation in Computer-Aided Manufacturing Processes. I: Metals. Online ISSN 2075-4701. Volum 11. DOI: 10.3390/met11010175

Hirpa Gelgele Lemu; Øyvind Karlsen (2021) Questionnarie-based Survey of Experiences with the Use of Expanding PIN Systems in Mechanical Joints. I: Results in Engineering (RINENG). Online ISSN 2590-1230. Volum 9. s.100212-100212. DOI: 10.1016/j.rineng.2021.100212

Abdulbasit Mohammed; Hirpa Gelgele Lemu; Belete Sirahbizu (2021) Determining Optimum Rotary Blade Design for Wind-Powered Water-Pumping Systems for Local Selected Sites. I: Strojniski vestnik. ISSN 0039-2480. Volum 67. s.214-222. DOI: 10.5545/sv-jme.2021.7140

Temesgen Batu Gemechu; Hirpa G. Lemu; Belete Sirhabizuh (2020) Study of the Performance of Natural Fiber Reinforced Composites for Wind Turbine Blade Applications. I: Advances in Science and Technology Research Journal.

Thomasz Trzepiecinski; Hirpa G. Lemu (2020) Effect of Lubrication on Friction in Bending under Tension Test-Experimental and Numerical Approach. I: Metals. Online ISSN 2075-4701. Volum 10. s.544-544. DOI: 10.3390/met10040544

Temesgen Batu; Hirpa G. Lemu; Belete Sirhabizuh (2020) Study of the Performance of Natural Fiber Reinforced Composites for Wind Turbine Blade Applications. I: Advances in Science and Technology Research Journal. Online ISSN 2299-8624. Volum 14. s.67-75. DOI: 10.12913/22998624/118201

Tomasz TrzepieciƄski; Hirpa G. Lemu (2020) Improving Prediction of Springback in Sheet Metal Forming Using Multilayer Perceptron-Based Genetic Algorithm. I: Materials. Online ISSN 1996-1944. Volum 13. DOI: 10.3390/ma13143129

Temesgen Batu; Hirpa G. Lemu (2020) Comparative study of the effect of chord length computation methods in design of wind turbine blade. I: Kristian Martinsen; Tao Yu; Kesheng Wang; Yi Wang, Advanced manufacturing and automation IX. Springer. ISBN 9789811523410. s.106-115. DOI: 10.1007/978-981-15-2341-0_14

Øyvind Karlsen; Hirpa G. Lemu (2020) On Modelling Techniques for Mechanical Joints: Literature Study. I: Yi Wang; Kesheng Wang; Tao Yu; Kristian Martinsen, Advanced manufacturing and automation IX. Springer. ISBN 9789811523410. s.116-125. DOI: 10.1007/978-981-15-2341-0_15

Temesgen Batu; Hirpa Gelgele Lemu (2020) Investigation of mechanical properties of false banana/glass fiber reinforced hybrid composite materials. I: Results in Materials. Online ISSN 2590-048X. Volum 8. DOI: 10.1016/j.rinma.2020.100152

Getachew A. Ambaye; Hirpa Gelgele Lemu (2020) Dynamic analysis of spur gear with backlash using ADAMS. I: Materials Today: Proceedings. Online ISSN 2214-7853. DOI: 10.1016/j.matpr.2020.09.309

Getachew A. Ambaye; Hirpa G. Lemu (2020) Numerical Study of Effect of Backlash on Flash Temperature of Spur Gear. I: International Review of Mechanical Engineering (IREME). ISSN 1970-8734. Volum 14. s.684-692. DOI: 10.15866/ireme.v14i11.19763

Jonathan B. Dawit; Hirpa Gelgele Lemu; Yohannes Regassa; Adugna Deressa Akessa (2020) Investigation of the mechanical properties of Acacia tortilis fiber reinforced natural composite. I: Materials Today: Proceedings. Online ISSN 2214-7853. Volum 38. DOI: 10.1016/j.matpr.2020.09.308

Tomasz Trzepiecinski; Hirpa G. Lemu (2020) Recent developments and trends in the friction testing for conventional sheet metal forming and incremental sheet forming. I: Metals. Online ISSN 2075-4701. Volum 10. s.1-34. DOI: 10.3390/met10010047

Jonathan B. Dawit; Yohannes Regassa; Hirpa G. Lemu (2020) Property characterization of acacia tortilis for natural fiber reinforced polymer composite. I: Results in Materials. Online ISSN 2590-048X. Volum 5. DOI: 10.1016/j.rinma.2019.100054

Endashaw Tesfaye Woldemariam; Hirpa G. Lemu (2019) A machine Learning based framework for model approximation followed by design Optimization for expensive numerical simulation-based Optimization problems. I: x ISOPE, The 29th International Ocean and Polar Engineering Conference. International Society of Offshore & Polar Engineers. ISBN 9781880653852. s.943-950.

Øyvind Karlsen; Hirpa G. Lemu (2019) Fretting fatigue and wear of mechanical joints: Literature study. I: IOP Conference Series: Materials Science and Engineering. ISSN 1757-8981. Volum 700. DOI: 10.1088/1757-899X/700/1/012015

Yohannes Regassa; Hirpa G. Lemu; Belete Sirabizuh (2019) Trends of using polymer composite materials in additive manufacturing. I: IOP Conference Series: Materials Science and Engineering. ISSN 1757-8981. Volum 659. DOI: 10.1088/1757-899X/659/1/012021

Mostafa Ahmed Atteya; Ove Mikkelsen; Hirpa G. Lemu (2019) State-of-the-art of crack propagation modelling in tubular joints. I: IOP Conference Series: Materials Science and Engineering. ISSN 1757-8981. Volum 700. DOI: 10.1088/1757-899X/700/1/012035

Thomasz Trzepiecinski; Hirpa G. Lemu (2019) Finite element method-based modeling of bending under tension friction test of deep drawing quality steel sheets. I: IOP Conference Series: Materials Science and Engineering. ISSN 1757-8981. Volum 504. DOI: 10.1088/1757-899X/504/1/012068

Mesay Alemu Tolcha; Hirpa G. Lemu (2019) Modeling Thermomechanical Stress with H13 Tool Steel Material Response for Rolling Die under Hot Milling. I: Metals. Online ISSN 2075-4701. Volum 9. DOI: 10.3390/met9050495

Bisrat M. Kebede; Hirpa G. Lemu (2019) Design, simulation and production of hydraulic briquette press for metal chips. I: Advances in Science and Technology Research Journal. Online ISSN 2299-8624. Volum 13. s.24-30. DOI: 10.12913/22998624/105809

Thomasz Trzepiecinski; Hirpa G. Lemu (2019) FEM-based assessment of wear of stamping die. I: IOP Conference Series: Materials Science and Engineering. ISSN 1757-8981. Volum 526. DOI: 10.1088/1757-899X/526/1/012002

Aboma Wagari Gebisa; Hirpa G. Lemu (2019) Influence of 3D Printing FDM Process Parameters on Tensile Property of ULTEM 9085. I: Procedia Manufacturing. Online ISSN 2351-9789. Volum 30. s.331-338. DOI: 10.1016/j.promfg.2019.02.047

Kowalik Marek; Thomasz Trzepiecinski; Hirpa G. Lemu (2019) Effect of Pressing Parameters on the Quality of Joint Formation of Heat Exchanger Fins with the Base Plate. I: MATEC Web of Conferences. Online ISSN 2261-236X. Volum 290. DOI: 10.1051/matecconf/201929003009

Tesfaye Olana Terefe; Hirpa G. Lemu; Addisu K/Mariam (2019) Review and synthesis of a walking machine (Robot) leg mechanism. I: MATEC Web of Conferences. Online ISSN 2261-236X. Volum 290. DOI: 10.1051/matecconf/201929008012

Abdulbasit Mohammed; Hirpa G. Lemu (2019) Wind Turbine System Modelling Using Bond Graph Method. I: Lecture Notes in Electrical Engineering. ISSN 1876-1100. Volum 484. s.95-105. DOI: 10.1007/978-981-13-2375-1_14

Thomasz Trzepiecinski; Hirpa G. Lemu (2019) Prediction of springback in the air V-bending of metallic sheets. I: IOP Conference Series: Materials Science and Engineering. ISSN 1757-8981. Volum 645. DOI: 10.1088/1757-899X/645/1/012011

Andres Garcia-Granada; Joan Catafal-Pedragosa; Hirpa G. Lemu (2019) Topology optimization through stiffness/weight ratio analysis for a three-point bending test of additive manufactured parts. I: IOP Conference Series: Materials Science and Engineering. ISSN 1757-8981. Volum 700. DOI: 10.1088/1757-899X/700/1/012012

Thomasz Trzepiecinski; Hirpa G. Lemu (2019) Numerical analysis of the influence of friction conditions on the pile-up effect in Vickers hardness measurements. I: IOP Conference Series: Materials Science and Engineering. ISSN 1757-8981. Volum 700. DOI: 10.1088/1757-899X/700/1/012019

Adugna Deressa Akessa; Aboma Wagari Gebisa; Hirpa G. Lemu (2019) Numerical simulation of FDM manufactured parts by adopting approaches in composite material simulation. I: IOP Conference Series: Materials Science and Engineering. ISSN 1757-8981. Volum 700. DOI: 10.1088/1757-899X/700/1/012016

Yohannes Regassa; Hirpa G. Lemu (2019) Multibody System Modelling and Simulation: Case Study on Excavator Manipulator. I: Kesheng Wang; Tao Yu; Jan Ola Strandhagen; Yi Wang, Advanced Manufacturing and Automation VIII Proceedings IWAMA 2018. Springer. ISBN 9789811323751. s.628-635. DOI: 10.1007/978-981-13-2375-1_79

Yohannes Regassa; Belete Sirabizuh; Hirpa G. Lemu (2019) Review and Analysis of Processing Principles and Applications of Self-healing Composite Materials. I: Yi Wang; Jan Ola Strandhagen; Tao Yu; Kesheng Wang, Advanced Manufacturing and Automation VIII Proceedings IWAMA 2018. Springer. ISBN 9789811323751. s.159-167. DOI: 10.1007/978-981-13-2375-1_21

Hirpa G. Lemu (2019) On Opportunities and Limitations of Additive Manufacturing Technology for Industry 4.0 Era. I: Tao Yu; Yi Wang; Jan Ola Strandhagen; Kesheng Wang, Advanced Manufacturing and Automation VIII Proceedings IWAMA 2018. Springer. ISBN 9789811323751. s.106-113. DOI: 10.1007/978-981-13-2375-1_15

Tesfaye O. Terefe; Hirpa G. Lemu; Addisu K/Mariam; Tadele B. Tuli (2019) Kinematic Modeling and Analysis of a Walking Machine (Robot) Leg Mechanism on a Rough Terrain. I: Advances in Science and Technology Research Journal. Online ISSN 2299-8624. Volum 13. s.43-53. DOI: 10.12913/22998624/109792

Endashaw Tesfaye Woldemariam; Hirpa G. Lemu (2019) Numerical simulation-based effect characterization and design Optimization of micro cross-flow turbine. I: Strojniski vestnik. ISSN 0039-2480. Volum 65. s.386-397. DOI: 10.5545/sv-jme.2018.5901

Abdissa M Aliyi; Hirpa G. Lemu (2019) Case study on topology optimized design for additive manufacturing. I: IOP Conference Series: Materials Science and Engineering. ISSN 1757-8981. Volum 659. s.1-9. DOI: 10.1088/1757-899X/659/1/012020

Thomasz Trzepiecinski; Hirpa G. Lemu (2019) A Three-Dimensional Elastic-Plastic Contact Analysis of Vickers Indenter on a Deep Drawing Quality Steel Sheet. I: Materials. Online ISSN 1996-1944. Volum 12. DOI: 10.3390/ma12132153

Aboma Wagari Gebisa; Hirpa G. Lemu (2018) Additive Manufacturing for the Manufacture of Gas Turbine Engine Components: Literature Review and Future Perspectives. I: . ASME, ASME Turbo Expo 2018: Turbomachinery Technical Conference and Exposition Volume 6: Ceramics; Controls, Diagnostics, and Instrumentation; Education; Manufacturing Materials and Metallurgy Oslo, Norway, June 11–15, 2018. The American Society of Mechanical Engineers (ASME). ISBN 9780791851128. DOI: 10.1115/GT2018-76686

Ina D. Nikolova; Hirpa G. Lemu; Dimitrinka S. Dahterova; Vanio D. Ivanov (2018) A Comparative Study of Outranking Methods for Multi-Criteria Optimization of Electromechanical Modules. I: Tehnicki Vjesnik. ISSN 1330-3651. Volum 25. s.1330-1338. DOI: 10.17559/TV-20170111011555

Aboma Wagari Gebisa; Hirpa G. Lemu (2018) Investigating Effects of Fused-Deposition Modeling (FDM) Processing Parameters on Flexural Properties of ULTEM 9085 using Designed Experiment. I: Materials. Online ISSN 1996-1944. Volum 11. DOI: 10.3390/ma11040500

Kate Iren Byberg; Aboma Wagari Gebisa; Hirpa G. Lemu (2018) Mechanical properties of ULTEM 9085 material processed by fused deposition modeling. I: Polymer testing. ISSN 0142-9418. Volum 72. s.335-347. DOI: 10.1016/j.polymertesting.2018.10.040

Endashaw Tesfaye Woldemariam; Hirpa G. Lemu; Gary G. Wang (2018) CFD-Driven Valve Shape Optimization for Performance Improvement of a Micro Cross-Flow Turbine. I: Energies. Online ISSN 1996-1073. Volum 11. s.1-18. DOI: 10.3390/en11010248

Aboma Wagari Gebisa; Hirpa G. Lemu (2018) Effect of Process Parameters on Compressive Properties of ULTEM 9085 Produced by FDM Process. I: . ASME, ASME 2018 International Mechanical Engineering Congress and Exposition November 9–15, 2018, Pittsburgh, Pennsylvania, USA Volume 2: Advanced manufacturing. The American Society of Mechanical Engineers (ASME). ISBN 9780791852019. DOI: 10.1115/IMECE2018-87523

Thomasz Trzepiecinski; Hirpa G. Lemu (2018) Frictional Resistances of AMS5599 Nickel-based Alloy at High Pressure Conditions. I: IOP Conference Series: Materials Science and Engineering. ISSN 1757-8981. Volum 381. DOI: 10.1088/1757-899X/381/1/012159

Delesa Kajela; Hirpa G. Lemu (2018) Design and Modelling of a Light Duty Trencher for Local Conditions. I: Advances in Science and Technology Research Journal. Online ISSN 2299-8624. Volum 12. s.303-311. DOI: 10.12913/22998624/85661

Tesfaye Olana Terefe; Hirpa G. Lemu (2018) Solution Approaches to Differential Equations of Mechanical System Dynamics: A Case Study of Car Suspension System. I: Advances in Science and Technology Research Journal. Online ISSN 2299-8624. Volum 12. s.266-273. DOI: 10.12913/22998624/85662

Karsten Mikal Kopperstad; Hirpa G. Lemu (2018) Design and Performance Study of Additive Manufactured Thrusters for Remotely Operated Underwater Vehicle. I: Dmitri Matskevitch; Beom-Soo Hyun; Alan M. Wang; Jin S. Chung, The Proceedings of The Twenty-eighth (2018) International OCEAN AND POLAR ENGINEERING CONFERENCE, ISOPE 2018. International Society of Offshore & Polar Engineers. ISBN 9781880653876.

Endashaw Tesfaye Woldemariam; Eric Coatanéa; G. Gary Wang; Hirpa G. Lemu; Di Wu (2018) Customized dimensional analysis conceptual modelling framework for design optimization—a case study on the cross-flow micro turbine model. I: Engineering optimization (Print). ISSN 0305-215X. DOI: 10.1080/0305215X.2018.1519556

Kristen Rege; Hirpa G. Lemu (2017) A Review of Fatigue Crack Propagation Modelling Techniques Using FEM and XFEM. I: IOP Conference Series: Materials Science and Engineering. ISSN 1757-8981. Volum 276. s.1-17. DOI: 10.1088/1757-899X/276/1/012027

Aboma Wagari Gebisa; Hirpa G. Lemu (2017) A Case Study on Topology Optimized Design for Additive Manufacturing. I: IOP Conference Series: Materials Science and Engineering. ISSN 1757-8981. Volum 276. DOI: 10.1088/1757-899X/276/1/012026

Imad Berkani; Øyvind Karlsen; Hirpa G. Lemu (2017) Experimental and numerical study of Bondura® 6.6 PIN joints. I: IOP Conference Series: Materials Science and Engineering. ISSN 1757-8981. Volum 276. DOI: 10.1088/1757-899X/276/1/012028

Hirpa G. Lemu; Tomasz TrzepieciƄski; Andrzej Kubit; Romuald Fejkiel (2017) FRICTION MODELING OF Al-Mg ALLOY SHEETS BASED ON MULTIPLE REGRESSION ANALYSIS AND NEURAL NETWORKS. I: Advances in Science and Technology Research Journal. Online ISSN 2299-8624. Volum 11. s.48-57. DOI: 10.12913/22998624/68460

Thomasz Trzepiecinski; Hirpa G. Lemu (2017) Prediction of springback in V-die air bending process by using finite element method. I: MATEC Web of Conferences. Online ISSN 2261-236X. Volum 121. DOI: 10.1051/matecconf/201712103023

Hirpa G. Lemu (2017) On Competition-driven Teaching of Multidisciplinary Engineering Education: Implementation cases at University of Stavanger. I: Nordic Journal of STEM Education. Online ISSN 2535-4574. Volum 1. s.278-286. DOI: 10.5324/njsteme.v1i1.2340

Adugna Deressa Akessa; Hirpa G. Lemu; Aboma Wagari Gebisa (2017) Mechanical Property Characterization of Additive Manufactured ABS Material Using Design of Experiment Approach. I: N. N., ASME 2017 International Mechanical Engineering Congress and Exposition. The American Society of Mechanical Engineers (ASME). ISBN 9780791858493. DOI: 10.1115/IMECE2017-70144

Hirpa G. Lemu (2017) Assessment and analysis of structural health monitoring techniques for rotating machines. I: ISOPE - International Offshore and Polar Engineering Conference. Proceedings. ISSN 1098-6189. s.981-988.

Herman Vestli; Hirpa G. Lemu; Bjørn T. Svendsen; Ole Gabrielsen; S.A. Sudath C. Siriwardane (2017) Case studies on structural health monitoring of offshore bottom-fixed steel structures. I: ISOPE - International Offshore and Polar Engineering Conference. Proceedings. ISSN 1098-6189. s.965-972.

Endashaw Tesfaye Woldemariam; Hirpa G. Lemu; Gary G. Wang (2017) Geometric Parameters' Effect Characterization and Design Optimization of a Micro Scale Cross-flow Turbine for an Improved Performance. I: ISOPE - International Offshore and Polar Engineering Conference. Proceedings. ISSN 1098-6189. s.569-576.

Aboma Wagari Gebisa; Hirpa G. Lemu (2017) Design for manufacturing to design for Additive Manufacturing: Analysis of implications for design optimality and product sustainability. I: Procedia Manufacturing. Online ISSN 2351-9789. Volum 13. s.724-731. DOI: 10.1016/j.promfg.2017.09.120

Tomasz TrzepieciƄski; Hirpa G. Lemu; Romuald Fejkiel (2017) Numerical simulation of effect of friction directionality on forming of anisotropic sheets. I: International Journal of Simulation Modelling. ISSN 1726-4529. Volum 16. s.590-602. DOI: 10.2507/IJSIMM16(4)3.392

Thomasz Trzepiecinski; Hirpa G. Lemu (2017) Effect of Activation Function and Post Synaptic Potential on Response of Artificial Neural Network to Predict Frictional Resistance of Aluminium Alloy Sheets. I: IOP Conference Series: Materials Science and Engineering. ISSN 1757-8981. Volum 269. s.1-6. DOI: 10.1088/1757-899X/269/1/012041

Thomasz Trzepiecinski; Romuald Fejkiel; Hirpa G. Lemu (2017) Experimental Investigation of Frictional Resistances in the Drawbead Region of the Sheet Metal Forming Processes. I: IOP Conference Series: Materials Science and Engineering. ISSN 1757-8981. Volum 276. DOI: 10.1088/1757-899X/269/1/012042

Thomasz Trzepiecinski; Hirpa G. Lemu (2017) Effect of Computational Parameters on Springback Prediction by Numerical Simulation. I: Metals. Online ISSN 2075-4701. Volum 7. DOI: 10.3390/met7090380

Amir Safari; Kambiz Haji Hajikolaei; Hirpa G. Lemu; Gary G. Wang (2016) A High-Dimensional Model Representation Guided PSO Methodology with Application on Compressor Airfoil Shape Optimization. I: . ASME Turbo Expo 2016, ASME Turbo Expo 2016: Turbomachinery Technical Conference and Exposition. The American Society of Mechanical Engineers (ASME). ISBN 9780791849750.

Rodrigo L. Banos; Hirpa G. Lemu (2016) Design and performance analysis of anchor system for a single-body wave energy converter. I: NN NN, ASME 2016 35th International Conference on Ocean, Offshore and Arctic Engineering - Volume 6: Ocean Space Utilization; Ocean Renewable Energy. The American Society of Mechanical Engineers (ASME). ISBN 9780791849972. DOI: 10.1115/omae2016-54043

Jose V. Taboada; Hirpa G. Lemu (2016) Analysis of Wave Energy Sources in the North Atlantic Waters in View of Design Challenges. I: NN NN, ASME 2016 35th International Conference on Ocean, Offshore and Arctic Engineering - Volume 6: Ocean Space Utilization; Ocean Renewable Energy. The American Society of Mechanical Engineers (ASME). ISBN 9780791849972. DOI: 10.1115/omae2016-54042

Benjamin ؝ygarden; Mathias Bruset; Hirpa G. Lemu (2016) Multibody Dynamics Simulation of ROV Manipulator Designed for Student Competition. I: Kesheng Wang; Yi Wang; Jan Ola Strandhagen; Tao Yu, Advanced Manufacturing and Automation VI. Atlantis Press. ISBN 9789462522435. DOI: 10.2991/iwama-16.2016.42

Ina D. Nikolova; Dimitrinka S. Dahterova; Vanio D. Ivanov; Hirpa G. Lemu (2016) Multi-criteria Optimization of Electromechanical Modules: Part 1- PROMETHEE method. I: Kesheng Wang; Yi Wang; Jan Ola Strandhagen; Tao Yu, Advanced Manufacturing and Automation VI. Atlantis Press. ISBN 9789462522435. DOI: 10.2991/iwama-16.2016.23

Ina D. Nikolova; Dimitrinka S. Dahterova; Dimitrinka S. Ivanov; Hirpa G. Lemu (2016) Multi-criteria Optimization of Electromechanical Modules: Part 2 - RAZOR method. I: Kesheng Wang; Yi Wang; Jan Ola Strandhagen; Tao Yu, Advanced Manufacturing and Automation VI. Atlantis Press. ISBN 9789462522435. DOI: 10.2991/iwama-16.2016.28

Endashaw Tesfaye Woldemariam; Hirpa G. Lemu (2016) Comparative analysis of computational methods in Fluid-Structure Interaction: Temporal descretization and coupling techniques. I: Kesheng Wang; Yi Wang; Jan Ola Strandhagen; Tao Yu, Advanced Manufacturing and Automation VI. Atlantis Press. ISBN 9789462522435. DOI: 10.2991/iwama-16.2016.26

Endashaw Tesfaye Woldemariam; Hirpa G. Lemu (2016) Nonlinear isogeometric analysis in simulation-based design optimization: State-of-the-art analysis. I: Kesheng Wang; Yi Wang; Jan Ola Strandhagen; Tao Yu, Advanced Manufacturing and Automation V. WIT Press. ISBN 9781784661694. s.89-97. DOI: 10.2495/IWAMA150111

Hirpa G. Lemu (2016) Proposal for design-centered cloud computing in engineering design and manufacturing. I: Kesheng Wang; Yi Wang; Jan Ola Strandhagen; Tao Yu, Advanced Manufacturing and Automation V. WIT Press. ISBN 9781784661694. s.241-249. DOI: 10.2495/IWAMA150281

Ashish Aeran; Hirpa G. Lemu (2016) Time Integration Schemes in Dynamic Problems: Effect of Damping on Numerical Stability and Accuracy. I: Kesheng Wang; Yi Wang; Jan Ola Strandhagen; Tao Yu, Advanced Manufacturing and Automation VI. Atlantis Press. ISBN 9789462522435. DOI: 10.2991/iwama-16.2016.40

Hirpa G. Lemu (2016) Beyond Rapid Prototyping: Study of prospects and impacts of 3D printing in functional part fabrication. I: Kesheng Wang; Yi Wang; Jan Ola Strandhagen; Tao Yu, Advanced Manufacturing and Automation VI. Atlantis Press. ISBN 9789462522435. DOI: 10.2991/iwama-16.2016.25

Petrova Radostina; Hirpa G. Lemu (2016) Adaptability of surgical robot to guide its clamp operation along predefined path. I: Kesheng Wang; Yi Wang; Jan Ola Strandhagen; Tao Yu, Advanced Manufacturing and Automation V. WIT Press. ISBN 9781784661694. s.126-133.

Tomasz TrzepieciƄski; Andrzej TRYTEK; Hirpa G. Lemu (2016) Study of Frictional Properties of AMS Nickel-Chromium Alloys. I: Key Engineering Materials. ISSN 1013-9826. Volum 674. s.244-249. DOI: 10.4028/www.scientific.net/KEM.674.244

Amir Safari; Younis Adel; Gary G. Wang; Hirpa G. Lemu; Dong Zuomin (2015) Development of a metamodel assisted sampling approach to aerodynamic shape optimization problems. I: Journal of Mechanical Science and Technology. ISSN 1738-494X. Volum 29. s.2013-2024. DOI: 10.1007/s12206-015-0422-5

Tomasz TrzepieciƄski; Anna Bazan; Hirpa G. Lemu (2015) Study of Frictional Characteristics of Steel Sheets Used in Automobile Industry. I: International Journal of Automotive Technology. ISSN 1229-9138. Volum 16. s.849-863. DOI: 10.1007/s12239-015-0087-1

Hirpa G. Lemu (2015) Advances in numerical computation based mechanical system design and simulation. I: Advances in Manufacturing. ISSN 2095-3127. Volum 3. s.130-138. DOI: 10.1007/s40436-015-0110-9

Hirpa G. Lemu; Petrova Radostina; Assen Mihailov (2015) Study of a Vertical Axis Wind Turbine Using Fluid Particle Trajectory. I: Applied Mechanics and Materials. ISSN 1660-9336. Volum 799-800. s.618-624. DOI: 10.4028/www.scientific.net/AMM.799-800.618

Tomasz TrzepieciƄski; anna BAZAN; Hirpa G. Lemu (2015) Finite Element Modeling of Frictional and Material Anisotropy during Forming of Steel Cylindrical Cups. I: Applied Mechanics and Materials. ISSN 1660-9336. Volum 789-790. s.3-6. DOI: 10.4028/www.scientific.net/AMM.789-790.3

Tomasz TrzepieciƄski; Hirpa G. Lemu (2015) Proposal of Experimental-Numerical Method for Friction Description in Sheet Metal Forming. I: Strojniski vestnik. ISSN 0039-2480. Volum 61. s.383-391. DOI: 10.5545/sv-jme.2015.2404

Ioan Larion; Hirpa G. Lemu (2014) Study of Coanda Effect Applied to Vertical Wind Turbine Blades. I: ASME 2014, ASME 2014 International Mechanical Engineering Congress and Exposition Volume 6B: Energy Montreal, Quebec, Canada, November 14–20, 2014. The American Society of Mechanical Engineers (ASME). ISBN 9781379184652. DOI: 10.1115/IMECE2014-39864

Radostina Petrova; Hirpa G. Lemu (2014) Stress and Displacement Analysis of a HAWT Under Time-Variable Wind. I: ASME 2014, ASME 2014 International Mechanical Engineering Congress and Exposition Volume 6B: Energy Montreal, Quebec, Canada, November 14–20, 2014. The American Society of Mechanical Engineers (ASME). ISBN 9781379184652. DOI: 10.1115/IMECE2014-37018

Hirpa G. Lemu (2014) Virtual Engineering Based Design Integration, Visualization and Validation. I: Journal of Applied Mechanical Engineering. Online ISSN 2168-9873. Volum 3. DOI: 10.4172/2168-9873.1000e129

Hirpa G. Lemu (2014) Current status and challenges of using geometric tolerance information in intelligent manufacturing systems. I: Advances in Manufacturing. ISSN 2095-3127. Volum 2. s.13-21. DOI: 10.1007/s40436-014-0056-3

Hirpa G. Lemu; Tomasz TrzepieciƄski (2014) Multiple Regression and Neural Network Based Characterization of Friction in Sheet Metal Forming. I: Advanced Materials Research. ISSN 1022-6680. Volum 1051. s.204-210. DOI: 10.4028/www.scientific.net/AMR.1051.204

Hirpa G. Lemu (2014) Simulation-based engineering approaches for renewable energy conversion systems. I: Advanced Materials Research. ISSN 1022-6680. Volum 1039. s.91-98. DOI: 10.4028/www.scientific.net/AMR.1039.91

Hirpa G. Lemu (2014) Virtual engineering in design and manufacturing. I: Advances in Manufacturing. ISSN 2095-3127. Volum 2. s.289-294. DOI: 10.1007/s40436-014-0085-y

Tomasz TrzepieciƄski; Hirpa G. Lemu (2014) Frictional conditions of AA5251 aluminium alloy sheets using drawbead simulator tests and numerical methods. I: Strojniski vestnik. ISSN 0039-2480. Volum 60. s.51-60. DOI: 10.5545/sv-jme.2013.1310

Alemayehu W. Huluka; Hirpa G. Lemu (2014) Study and Development of Vehicle Collision Detection System. I: 2014 ASME, ASME 2014 International Mechanical Engineering Congress and Exposition Volume 12: Transportation Systems Montreal, Quebec, Canada, November 14–20, 2014. The American Society of Mechanical Engineers (ASME). ISBN 9781379184652. DOI: 10.1115/IMECE2014-37227

Kambiz Haji Hajikolaei; Amir Safari; Gaofeng Wang; Hirpa G. Lemu (2014) Surrogate-assisted Self-accelerated Particle Swarm Optimization. I: SciTech AIAA, 10th AIAA Multidisciplinary Design Optimization Conference. American Institute of Aeronautics and Astronautics (AIAA). ISBN 9781624103100. DOI: 10.2514/6.2014-1486

Mojtaba P. Omran; Amin Amani; Hirpa G. Lemu (2013) Analytical Approximation of Nonlinear Vibration of String with Large Amplitudes. I: Journal of Mechanical Science and Technology. ISSN 1738-494X. Volum 27. s.981-986. DOI: 10.1007/s12206-013-0301-x

Hirpa G. Lemu (2013) On Hybrid Computer-Aided Tools to Interface Design Data. I: Journal of Mechanics Engineering and Automation. ISSN 2159-5275. Volum 3. s.397-404.

Amir Safari; Hirpa G. Lemu; Mohsen Assadi (2013) A Novel Combination of Adaptive Tools for Turbomachinery Airfoil Shape Optimization Using a Real-coded Genetic Algorithm. I: 2013 ASME Turbo Expo, ASME Turbo Expo: Turbine Technical Conference and Exposition 2013, USA. The American Society of Mechanical Engineers (ASME). ISBN 9780791855232. DOI: 10.1115/GT2013-94093

Hirpa G. Lemu (2013) Study of the role of virtual engineering technologies in design. I: Kesheng Wang; Jan Ola Strandhagen; Dawei Tu, Proceedings of IWAMA 2013 - The Third International Workshop of Advanced Manufacturing and Automation. Tapir Akademisk Forlag. ISBN 9788232103775. s.148-155.

Hirpa G. Lemu; Tomasz TrzepieciƄski (2013) Numerical and Experimental Study of Frictional Behavior in Bending Under Tension Test. I: Strojniski vestnik. ISSN 0039-2480. Volum 59. s.41-49. DOI: 10.5545/sv-jme.2012.383

Hirpa G. Lemu (2013) Assessment of geometric tolerance information as a carrier of design intent to manufacturing and inspection. I: Kesheng Wang; Jan Ola Strandhagen; Dawei Tu, Proceedings of IWAMA 2013 - The Third International Workshop of Advanced Manufacturing and Automation. Tapir Akademisk Forlag. ISBN 9788232103775. s.59-70.

Amir Safari; Hirpa G. Lemu; Soheil Jafari; Mohsen Assadi (2013) A Comparative Analysis of Nature-Inspired Optimization Approaches to 2D Geometric Modelling for Turbomachinery Applications. I: Mathematical Problems in Engineering (MPE). ISSN 1024-123X. s.1-15. DOI: 10.1155/2013/716237

Tomasz TrzepieciƄski; Hirpa G. Lemu (2012) Application of Genetic Algorithms to Optimize Neural Networks for Selected Tribological Tests. I: Journal of Mechanics Engineering and Automation. ISSN 2159-5275. Volum 2. s.69-76.

Hirpa G. Lemu; Safet Kurtovic (2012) 3D Printing for rapid manufacturing : study of dimensional and geometrical accuracy. I: Jan Frick; Bjørge Timenes Laugen, Advances in Production Management Systems. Value Networks: Innovation, Technologies, and Management. Springer Science+Business Media B.V.. ISBN 9783642339790. s.470-479. DOI: 10.1007/978-3-642-33980-6_51

Hirpa G. Lemu; Tomasz TrzepieciƄski (2012) Study of Material Modeling Strategies for Deformability Analysis of Rectangular Cups. I: Advanced Materials Research. ISSN 1022-6680. Volum 498. s.243-248. DOI: 10.4028/www.scientific.net/AMR.498.243

Hirpa G. Lemu; Thomasz Trzepiecinski (2012) FEM Based Deformability Analysis of Metal Forming: Influence of Material Models and Analysis Approaches. I: AIP Conference Proceedings. ISSN 0094-243X. Volum 1431. s.702-710. DOI: 10.1063/1.4707626

Thomasz Trzepiecinski; Hirpa G. Lemu (2012) Study of Material Anisotropy in Metal Forming Using Finite Element Methods. I: Hirpa G. Lemu, Anisotropy Research: New Developments. Nova Science Publishers. ISBN 9781620819777. s.1-24. DOI: 10.1007/s12289-010-0994-7

Amir Safari; Hirpa G. Lemu (2012) Optimum nurbs curve fitting for geometry parameterization of gas turbine blade’s sections ; part 2: swarm intelligence techniques. I: conference ASME, International mechanical engineering congress and exposition. The American Society of Mechanical Engineers (ASME). ISBN 9780791845172.

Amir Safari; Hirpa G. Lemu (2012) Optimum nurbs curve fitting for geometry parameterization of gas turbine blade's sections ; part 1: evolutionary optimization techniques. I: conference ASME, International mechanical engineering congress and exposition. The American Society of Mechanical Engineers (ASME). ISBN 9780791845172.

Hirpa G. Lemu; Jan Frick; Tadeusz Uhl; Wojciech Lisowski; Piotr Piwowarczyk (2012) Study on need assessment of mechatronics education in Norway and Poland. I: Jan Frick; Bjørge Timenes Laugen, Advances in Production Management Systems. Value Networks: Innovation, Technologies, and Management. Springer Science+Business Media B.V.. ISBN 9783642339790. s.557-566. DOI: 10.1007/978-3-642-33980-6_60

Amir Safari; Hirpa G. Lemu (2012) A comparative study of optimum bezier and NURBS curve fitting for measured point cloud of airfoil shapes. I: Kesheng Wang; Jan Ola Strandhagen; Dawei Tu, Proceedings of IWAMA 2012 - The Second International Workshop of Advanced Manufacturing and Automation. Tapir Akademisk Forlag. ISBN 9788232101108. s.421-428.

Radostina Petrova; Hirpa G. Lemu (2012) Design study for dynamic behavior of wind turbine blade. I: Kesheng Wang; Jan Ola Strandhagen; Dawei Tu, Proceedings of IWAMA 2012 - The Second International Workshop of Advanced Manufacturing and Automation. Tapir Akademisk Forlag. ISBN 9788232101108. s.131-138.

Hirpa G. Lemu; Jan Frick; Tadeusz Uhl; Wojciech Lisowski; Piotr Piwowarczyk (2011) Study on Need Assessment of Mechatronics Education in Norway and Poland. I: Jan Frick, Advances in production management systems : value networks : innovatio n,technologies and management. Universitetet i Stavanger. ISBN 9788276444612.

Hirpa G. Lemu (2011) Influence of Interference Fit and Surface Roughness on Contact Resistance of Tubing Connections. I: Journal of Mechanics Engineering and Automation. ISSN 2159-5275. Volum 1. s.285-292.

Amir Safari; Hossein Saeidi; Hirpa Lemu Gelgele (2011) Assessment of gas turbine compressor fouling effects on operation cost and performance of thermal power plants in Iran. I: Maneesh Singh; Rao Raj B. K. N.; Jayantha Prasanna Liyanage, Proceedings of the 24th International Congress on Condition Monitoring and Diagnostics Engineering Management (COMADEM2011). COMADEM International. ISBN 9780954130725. s.906-914.

Hirpa Lemu Gelgele; Thomasz Trzepiecinski (2011) Investigation of Anisotropy Problems in Sheet Metal Forming using Finite Element Method. I: International Journal of Material Forming. ISSN 1960-6206. Volum 4. s.357-369. DOI: 10.1007/s12289-010-0994-7

Hirpa Lemu Gelgele; Jiregna Hirko Foggi (2010) Finite element based stress prediction for design of composite materials. I: Kesheng Wang; Odd Myklebust; Dawei Tu, International Workshop of Advanced Manufacturing and Automation : (IWAMA2010) : 25-27th September, 2010, Shanghai University, Shanghai, China. Tapir Akademisk Forlag. ISBN 9788251925181. s.149-156.

Hirpa Lemu Gelgele (2010) Study of Design Optimization Using Finite Element Method and Genetic Algorithm. I: Kesheng Wang; Odd Myklebust; Dawei Tu, International Workshop of Advanced Manufacturing and Automation : (IWAMA2010) : 25-27th September, 2010, Shanghai University, Shanghai, China. Tapir Akademisk Forlag. ISBN 9788251925181. s.127-134.

Hirpa Lemu Gelgele; Jiregna Hirko Foggi (2010) Finite Element Based Stress Prediction for Design of Composite Materials. I: Kesheng Wang; Odd Myklebust; Dawei Tu, International Workshop of Advanced Manufacturing and Automation : (IWAMA2010) : 25-27th September, 2010, Shanghai University, Shanghai, China. Tapir Akademisk Forlag. ISBN 9788251925181. s.149-156.

Hirpa Lemu Gelgele (2006) Study on CAD Integrated Analysis for Complex Structures. I: Knowledge Enterprise: Intelligent Strategies in Product Design, Manufacturing and Management. Springer. s.673-678.

Bøker og kapitler

Dimitrios Pavlou; José A.F.O. Correia; Tiago Fazeres-Ferradosa; Ove Tobias Gudmestad; Sudath C. Siriwardane; Hirpa G. Lemu; Gerhard Ersdal; Jayantha Prasanna Liyanage; Vidar Folke Hansen; Mona Wetrhus Minde; Chandima RATNAYAKE MUDIYANSELAGE; Andreas Delimitis; Idriss El-Thalji; Mudiyan Nirosha Damayanthi Adasooriya; Samarakoon Mudiyansele Samindi Samarakoon; Tor Hemmingsen (2024) Analytical and experimental methods in mechanical and civil engineering : Contributions of the 1st olympiad in engineering science (OES 2023). Springer Nature. ISBN 9783031497223.

Hirpa G. Lemu (2012) Anisotropy Research: New Developments. Nova Science Publishers. ISBN 9781620819777.

Hirpa Lemu Gelgele (2008) Dimensjonering av maskinelementer. UiS.

Hirpa Lemu Gelgele (2008) Introductory Tutorials in Using ANSYS 11 and MATLAB. UiS.

Formidling

Naol Dessalegn Dejene; Hirpa G. Lemu; Sang-Hu Park (2025) Machine-Learning-Enabled Energy-Density Mapping for Surface Roughness Prediction in L-PBF AlSi10Mg. I: Korean Society of Machine Tool Engineers. Online ISSN 2384-2407.

Mesay Alemu Tolcha; Tensay Mitikneh Gebrehiwot; Hirpa G. Lemu (2024) Correction to: Enhancing Mechanical Properties of Cast Ingot Al6061 Alloy Using ECAP Process (Journal of Materials Engineering and Performance, (2024), 10.1007/s11665-024-09978-3). I: Journal of materials engineering and performance (Print). ISSN 1059-9495. DOI: 10.1007/s11665-024-10276-1

Edosa K. Tesema; Hirpa G. Lemu (2023) Topology Optimization of Plastic Shredding Machine Blade Carriage. IWAMA23 conference; 2023-10-15 - 2023-10-16.

Weynishet D. Kelbesa; Firankor T. Daba; Hirpa G. Lemu (2023) Effect of Fiber Orientation on Water Absorption and Hardness of Lowland Bamboo Fiber Reinforced Composite. IWAMA23 conference; 2023-10-15 - 2023-10-16.

Yosef Wakjira Adugna; Heinrich Brüggemann; Erik Hafnor; Ane Djuv; Aksel Paulsen; Hanne Røland Hagland; Hirpa Gelgele Lemu (2023) A framework for the visualization of femoral fractures from Imaging to 3D Print. National Conference for Additive Manufacturing 2023; 2023-03-21 - 2023-03-22.

Amanuel Tura; Hirpa G. Lemu; Lingerew E Melaku; Hana B. Mamo (2022) Impact of FDM 3D Printing Parameters on Compressive Strength and Printing Weight of PLA Components. IWAMA Conference 2022; 2022-11-01 - 2022-11-02.

Yosef Wakjira Adugna; Hirpa G. Lemu (2022) Comparative Evaluation of Stress Concentration Generated on Human Femur Structure Using Meshfree Software. IWAMA Conference 2022; 2022-11-01 - 2022-11-02.

Øyvind Karlsen; Hirpa G. Lemu (2021) Safety related study of Expanding Pin systems application in lifting and drilling equipment within Construction, Offshore, and Marine sectors. COTech Conference; 2021-11-25 - 2021-11-26.

Iyasu T Jiregna; Hirpa G. Lemu (2021) Thermal stress analysis of disc brake using analytical and numerical methods. COTech Conference; 2021-11-25 - 2021-11-26.

Bruno Villoria; Sudath C. Siriwardane; Hirpa G. Lemu (2021) Review on fatigue life assessment methods for welded joints in orthotropic steel decks of long-span bridges. COTech Conference; 2021-11-25 - 2021-11-26.

Amanuel Tura; Hanna Mamo; Yohannis Jelila; Hirpa G. Lemu (2021) Experimental investigation and ANN prediction for part quality improvement of fused deposition modeling parts. COTech Conference; 2021-11-25 - 2021-11-26.

Yohannes Regassa; Hirpa G. Lemu; Belete Sirhabizu (2021) Burst strength analysis of composite overwrapped pressure vessel using finite element method. COTech Conference; 2021-11-25 - 2021-11-26.

Goftila Sirata; Hirpa G. Lemu; Krzysztof Waclawiak; Yohanis D. Jelila (2021) Study of rail-wheel contact problem by analytical and numerical approaches. COTech Conference; 2021-11-25 - 2021-11-26.

Bao Nguyen; Hirpa G. Lemu; Ole Gabrielsen; Idriss El-Thalji (2021) Characterization of acoustic emission signals under 3-point bending test. COTech Conference; 2021-11-25 - 2021-11-26.

Yohanis D. Jelila; Hirpa G. Lemu; WiesƂaw pamula; Goftila Sirata (2021) Fatigue life analysis of wheel-rail contacts at railway turnouts using finite element modelling approach. COTech Conference; 2021-11-25 - 2021-11-26.

Yosef Adugna Wakjira; Hirpa G. Lemu; Adugna Deressa Akessa (2021) Overview study on challenges of additive manufacturing for a healthcare application. COTech conference; 2021-11-26 - 2021-11-27.

Frankor T. Daba; Hirpa Gelgele Lemu (2021) Conceptual modelling and topology optimization framework of tower crane hook: A case study. IWAMA 2021; 2021-10-11 - 2021-10-12.

Getachew A. Ambaye; Hirpa Gelgele Lemu (2021) Numerical stress analysis and fatigue life prediction of the classical external Geneva mechanism. IWAMA 2021; 2021-10-11 - 2021-10-12.

Jonathan B. Dawit; Hirpa Gelgele Lemu; Samrawit A. Tewelde (2021) Tensile and Flexural Properties of Acacia Tortilis/Glass Fiber Reinforced Hybrid Composites. IWAMA 2021; 2021-10-11 - 2021-10-12.

Getachew A. Ambaye; Hirpa Gelgele Lemu (2020) Dynamic analysis of spur gear with backlash using ADAMS. International Conference & Exposition on Mechanical, Material and Manufacturing Technology(ICE3MT2020); 2020-10-09 - 2020-10-10.

Hirpa Gelgele Lemu (2020) Application of High-dimensional and Nature Inspired Approaches to Design Optimization of Energy Converters. 8th EAI International Conference on Advancements of Science and Technology; 2020-10-02 - 2020-10-04.

Yohanis D. Jelila; Hirpa Gelgele Lemu (2020) Study of wheel-rail contacts at railway turnout using multibody dynamics simulation approach. 10th International Workshop of Advanced Manufacturing and Automation (IWAMA 2020); 2020-10-12 - 2020-10-13.

Nigatu D. Tilahun; Hirpa Gelgele Lemu (2020) Mechanical Vibration Analysis of Fiber Reinforced Polymer Composite Beams Using Analytical and Numerical Methods. 8th EAI International Conference on Advancements of Science and Technology; 2020-10-02 - 2020-10-04.

Yohannes Regassa; Hirpa Gelgele Lemu; Belete Sirabizuh (2020) Nature Inspired Design in Fiber Orientation Trends for Reinforcement of Composites. 8th EAI International Conference on Advancements of Science and Technology; 2020-10-02 - 2020-10-04.

Hirpa Gelgele Lemu (2020) Advances, opportunities and limitations of Additive Manufacturing Technology. International Conference & Exposition on Mechanical, Material and Manufacturing Technology(ICE3MT2020); 2020-10-09 - 2020-10-10.

Jonathan B. Dawit; Hirpa Gelgele Lemu; Yohannes Regassa; Adugna Deressa Akessa (2020) Investigation of the mechanical properties of Acacia tortilis fiber reinforced natural composite. International Conference & Exposition on Mechanical, Material and Manufacturing Technology(ICE3MT2020); 2020-10-09 - 2020-10-10.

Abdulbasit Mohammed; Hirpa Gelgele Lemu; Belete Sirabizuh (2020) Statistical Analysis of Ethiopian Wind Power Potential at Selected Sites. 8th EAI International Conference on Advancements of Science and Technology; 2020-10-02 - 2020-10-04.

Samrawit Alemayehu; Yohannes Regassa; Bisrath Yoseph; Hirpa Gelgele Lemu (2020) Mechanical Properties Characterization of Water Hyacinth (“Emboch”) Plant for Use as Fiber Reinforced Polymer Composite. 8th EAI International Conference on Advancements of Science and Technology; 2020-10-02 - 2020-10-04.

Temesgen Batu; Hirpa Gelgele Lemu (2020) Fatigue life study of false banana/glass fiber reinforced composite for wind turbine blade application. 10th International Workshop of Advanced Manufacturing and Automation (IWAMA2020); 2020-10-12 - 2020-10-13.

Getachew A. Ambaye; Hirpa Gelgele Lemu (2020) Effect of backlash on transmission error and time varying mesh stiffness. 10th International workshop of Advanced Manufacturing and Automation (IWAMA2020); 2020-10-12 - 2020-10-13.

Adugna Deressa Akessa; Aboma Wagari Gebisa; Hirpa G. Lemu (2019) Numerical simulation of FDM manufactured parts by adopting approaches in composite material simulation. Computational Methods in Offshore Technology; 2019-11-27 - 2019-11-29.

Yohannes Regassa; Hirpa G. Lemu; Belete Sirabizuh (2019) Trends of using polymer composite materials in additive manufacturing. 9th International Scientific Conference - Research and Development of Mechanical Elements and Systems (IRMES 2019); 2019-09-05 - 2019-09-07.

Temesgen Batu; Hirpa G. Lemu (2019) Comparative study of the effect of chord length computation methods in design of wind turbine blade. 9th International Workshop on Advanced Manufacturing and Automation; 2019-11-21 - 2019-11-22.

Øyvind Karlsen; Hirpa G. Lemu (2019) Fretting fatigue and wear of mechanical joints: Literature study. COTech & OGTech conference; 2019-11-27 - 2019-11-29.

Øyvind Karlsen; Hirpa G. Lemu (2019) On modelling techniques for Mechanical joints: Literature study. 9th International workshop on advanced manufacturing and automation; 2019-11-21 - 2019-11-22.

Kowalik Marek; Thomasz Trzepiecinski; Hirpa G. Lemu (2019) Effect of Pressing Parameters on the Quality of Joint Formation of Heat Exchanger Fins with the Base Plate. 9th Int. Conf. on Manufacturing Science and Education; 2019-06-05 - 2019-06-07.

Tesfaye Olana Terefe; Hirpa G. Lemu; Addisu K/Mariam (2019) Review and synthesis of a walking machine (Robot) leg mechanism. 9th Int. Conf. on Manufacturing Science and Education; 2019-06-05 - 2019-06-07.

Endashaw Tesfaye Woldemariam; Hirpa G. Lemu (2019) A machine Learning based framework for model approximation followed by design Optimization for expensive numerical simulation-based Optimization problems. ISOPE 2019; 2019-06-16 - 2019-06-21.

Mostafa Ahmed Atteya; Ove Mikkelsen; Hirpa G. Lemu (2019) State-of-the-art of crack propagation modelling in tubular joints. COTech & OGTech conference; 2019-11-27 - 2019-11-29.

Abdulbasit M Aliyi; Hirpa G. Lemu (2019) Case study on topology optimized design for additive manufacturing. 9th International Scientific Conference - Research and Development of Mechanical Elements and Systems (IRMES 2019); 2019-09-05 - 2019-09-07.

Thomasz Trzepiecinski; Hirpa G. Lemu (2018) FEM-based assessment of wear of stamping die. The International Conference on Materials Research and Innovation; 2018-12-17 - 2019-05-21.

Aboma Wagari Gebisa; Hirpa G. Lemu (2018) Effect of Process Parameters on Compressive Properties of ULTEM 9085 Produced by FDM Process. IMECE2018; 2018-11-09 - 2018-11-15.

Aboma Wagari Gebisa; Hirpa G. Lemu (2018) Additive Manufacturing for the Manufacture of Gas Turbine Engine Components: Literature Review and Future Perspectives. Turbo Expo 2018; 2018-06-17 - 2018-06-21.

Karsten Mikal Kopperstad; Hirpa G. Lemu (2018) Design and Performance Study of Additive Manufactured Thrusters for Remotely Operated Underwater Vehicle. International Society of Offshore and Polar Engineers (ISOPE); 2018-06-10 - 2018-06-15.

Yohannes Regassa; Hirpa G. Lemu (2018) Multibody System Modelling and Simulation: Case Study on Excavator Manipulator. IWAMA 2018; 2018-09-25 - 2018-09-26.

Hirpa G. Lemu (2018) On Opportunities and Limitations of Additive Manufacturing Technology for Industry 4.0 Era. IWAMA2018; 2018-09-25 - 2018-09-26.

Yohannes Regassa; Belete Sirabizuh; Hirpa G. Lemu (2018) Review and Analysis of Processing Principles and Applications of Self-healing Composite Materials. IWAMA 2018; 2018-09-25 - 2018-09-26.

Abdulbasit Mohammed; Hirpa G. Lemu (2018) Modelling Wind Turbine System Using Bond Graph Method. IWAMA2018; 2018-09-25 - 2018-09-26.

Hirpa G. Lemu (2018) Influence of 3D Printing FDM Process Parameters on Tensile Property of ULTEM 9085.. GCMM2018; 2018-12-05 - 2018-12-07.

Kristen Rege; Hirpa G. Lemu (2017) A review of fatigue crack propagation modelling techniques using FEM and XFEM. First Conference of Computational Methods in Offshore Technology - COTech 2017; 2017-11-30 - 2017-12-01.

Adugna Deressa Akessa; Hirpa G. Lemu; Aboma Wagari Gebisa (2017) Mechanical Property Characterization of Additive Manufactured ABS Material Using Design of Experiment Approach. ASME 2017 International Mechanical Engineering Congress and Exposition; 2017-11-03 - 2017-11-09.

Hirpa G. Lemu (2017) Assessment and Analysis of Structural Health Monitoring Techniques for Rotating Machines. International Society of Offshore and Polar Engineers Conference, ISOPE 2017,; 2017-06-26 - 2017-06-30.

Hirpa G. Lemu (2017) On Competition-driven Teaching of Multidisciplinary Engineering Education: Implementation cases at University of Stavanger. MNT Conference; 2017-03-30 - 2017-03-31.

Herman Vestli; Hirpa G. Lemu; Bjørn Thomas Svendsen; Ole Gabrielsen; S.A. Sudath C. Siriwardane (2017) Case Studies on Structural Health Monitoring of Offshore Bottom-fixed Steel Structures. ISOPE 2017 International Ocean and Polar Engineering; 2017-06-25 - 2017-06-30.

Thomasz Trzepiecinski; Romuald Fejkiel; Hirpa G. Lemu (2017) Experimental Investigation of Frictional Resistances in the Drawbead Region of the Sheet Metal Forming Processes. 4th AMMSE 2017; 2017-09-22 - 2017-09-24.

Jose V. Taboada; Hirpa G. Lemu (2016) Analysis of Wave Energy Sources in the North Atlantic Waters in View of Design Challenges. 35th International Conference on Ocean, Offshore and Arctic Engineering OMAE 2016; 2016-06-19 - 2016-06-24.

Amir Safari; Kambiz Haji Hajikolaei; Hirpa G. Lemu; Gary G. Wang (2016) A High-Dimensional Model Representation Guided PSO Methodology with Application on Compressor Airfoil Shape Optimization. Turboexpo 2016,; 2016-06-13 - 2016-06-17.

Erik Vasøy Olsen; Hirpa G. Lemu (2016) Mechanical testing of composite materials for monocoque design in Formula Student car. I: International Journal of Social, Behavioral, Educational, Economic, Business and Industrial Engineering. ISSN 2010-376X. Volum 10. s.1-8.

Endashaw Tesfaye Woldemariam; Hirpa G. Lemu (2016) Comparative analysis of computational methods in Fluid-Structure Interaction: Temporal descretization and coupling techniques. IWAMA – International Workshop of Advanced Manufacturing and Automation; 2016-11-10 - 2016-11-11.

Petrova Radostina; Mihailov Assen; Hirpa G. Lemu (2015) Study of a Vertical Axis Wind Turbine Using Fluid Particle Trajectory. ICMET 2015; 2015-07-01 - 2015-07-02.

Tomasz TrzepieciƄski; Hirpa G. Lemu (2015) A hybrid Method for Description of Frictional Resistance using Modified Bending Under Tension Friction Test. BALMATTRIB 2015; 2015-11-05 - 2015-11-06.

Hirpa G. Lemu (2015) Proposal for design-centered cloud computing in engineering design and manufacturing. IWAMA2015; 2015-10-22 - 2015-10-23.

Endashaw Tesfaye Woldemariam; Hirpa G. Lemu (2015) Nonlinear isogeometric analysis in simulation-based design optimization: State-of-the-art analysis. IWAMA2015; 2015-10-22 - 2015-10-23.

Petrova Radostina; Hirpa G. Lemu (2015) Adaptability of surgical robot to guide its clamp operation along predefined path. IWAMA2015; 2015-10-22 - 2015-10-23.

Larion Ioan; Hirpa G. Lemu (2014) Study of Coanda effect applied to vertical Wind turbine blades. ASME 2014 International Mechanical Engineering Congress and Exposition IMECE2014; 2014-11-14 - 2014-11-20.

Petrova Radostina; Hirpa G. Lemu (2014) Stress and displacement analysis of a HAWT under time-variable wind. ASME 2014 International Mechanical Engineering Congress and Exposition IMECE2014; 2014-11-14 - 2014-11-20.

Huluka Alemayehu W.; Hirpa G. Lemu (2014) Study and development of vehicle collision detection system. ASME 2014 International Mechanical Engineering Congress and Exposition IMECE2014; 2014-11-14 - 2014-11-20.

Amir Safari; Kambiz H. Hajikolaei; Gary G. Wang; Hirpa G. Lemu (2014) Surrogate-assisted Self-accelerated Particle Swarm Optimization. 10th AIAA Multidisciplinary Design Optimization Conference; 2014-01-13 - 2014-01-17.

Jose V. Taboada; Hirpa G. Lemu; Jose A. Perez (2014) Comparative analysis of two offshore wave energy conversion devices: Cape Verde vs. Flexible Drive Line designs. 1st International Conference on Renewable Energies Offshore; 2014-11-24 - 2014-11-26.

Amir Safari; Kambiz H. Hajikolaei; Hirpa G. Lemu; Gary G. Wang; Mohsen Assadi (2013) Decomposition of High-Dimensional Shape Optimization Problems Through Quantifying Design Variable Correlation. ASME IMECE 2013 Conference; 2013-11-15 - 2013-11-22.

Amir Safari; Hirpa G. Lemu; Assadi Mohsen (2013) A Novel Combination of Adaptive Tools for Turbomachinery Airfoil Shape Optimization Using a Real-coded Genetic Algorithm. ASME Turbo Expo 2013; 2013-06-03 - 2013-06-07.

Adel Younis; Amir Safari; G. Gary Wang; Hirpa G. Lemu; Zuomin Dong (2013) SHAPE OPTIMIZATION OF TYPICAL HEAVY-DUTY GAS TURBINE COMPRESSOR AIROFOIL USING METAMODEL BASED ALGORITHM. 10th World Congress on Structural and Multidisciplinary Optimization; 2013-05-19 - 2013-05-24.

Hirpa G. Lemu (2013) Multibody dynamics simulation in design and performance analysis of energy conversion systems – a review. NAFEMS Nordic Seminar 2013; 2013-02-05 - 2013-02-06.

Amir Safari; Hirpa G. Lemu; Henning Severson (2012) Geometric Modeling and Numerical Simulation of Airfoil Shapes Using Integrated MATLAB® and COMSOL Multiphysics®. COMSOL Conference 2012; 2012-10-10 - 2012-10-12.

Amir Safari; Hirpa G. Lemu (2012) Review of Recent Researches on Gas Turbine Blades Shape Optimization Techniques and Approaches. Recent Advances and Challenges in Energy, RACE - 2012, Published in International Journal of Earth Sciences and Engineering, ISSN 0974-5904; 2012-01-04 - 2012-01-06.

Amir Safari; Hirpa G. Lemu (2012) Optimum NURBS curve fitting for geometry parameterization of gas turbine blades’ sections: Part I – Evolutionary optimization techniques. ASME 2012 International Mechanical Engineering Congress & Exposition; 2012-11-09 - 2012-11-15.

Amir Safari; Hirpa G. Lemu (2012) Optimum nurbs curve fitting for geometry parameterization of gas turbine blade’s sections ; part 2: swarm intelligence techniques. International mechanical engineering congress and exposition; 2012-11-09 - 2012-11-15.

Hirpa G. Lemu (2011) Tolerances in Design and Strain Beyond Elastic Limit. Competence Development and Experience Sharing; 2011-10-04 - 2011-12-02.

Hirpa G. Lemu (2011) Transmission System Design and 2D/3D Finite Element Analysis. Competence Development and Experience Sharing; 2011-12-05 - 2011-12-13.

Hossein Said; Amir Safari; Hirpa G. Lemu (2011) A Quantitative Prediction of Axial Compressor Performance Deterioration Using Fouling Full 3D Modeling. International Conference on Applied Energy; 2011-05-16 - 2011-05-18.

Hirpa G. Lemu; Tomasz TrzepieciƄski (2011) FEM Based Deformability Analysis of Metal Forming: influence of material models and analysis approaches. Proc. of MESIC 2011: 4th Manufacturing Society International Conference; 2011-09-21 - 2011-09-23.

Tadeusz Uhl; Wojciech Lisowski; Daniel Prosak; Jan Frick; Hirpa G. Lemu (2011) Analysis of Companies' Needs Related to the Mechatronics Study Graduates. Summary Conference on Project FSS/2008/x/D5/W/0045; 2011-05-23 - 2011-05-24.

Hirpa Lemu Gelgele (2010) Experimental study and Finite Element Analysis of Expandable Tubulars. utenTitteltekst; 2010-05-08 - 2010-05-12.

Hirpa Lemu Gelgele (2010) Finite Element Methods in Strength Analysis of Orthopedics Devices. Annual Conference of Norwegian Society of Orthopedics Engineers; 2010-10-06 - 2010-10-07.

Hirpa Lemu Gelgele (2010) How to Use ANSYS for Strength Analysis - Application Examples for Students and Teaching Staff. utenTitteltekst; 2010-11-29 - 2010-12-03.

Hirpa Lemu Gelgele (2010) Rapid Prototyping - A manufacturing Tool for Orthopedics Devices. Annual Conference of Norwegian Society of Orthopedics Engineers; 2010-10-06 - 2010-10-07.

Hirpa Lemu Gelgele (2009) Study of Contact Area and Contact Resistance in Contact Design of Tubing Connections. 13th International Research/Expert Conference on Trends in the Development of Machinery and Associated Technology; 2009-09-21 - 2009-09-26.

Hirpa Lemu Gelgele (2009) Design and Analysis of Machines and Mechanisms. utenTitteltekst; 2009-05-04 - 2009-05-09.

Hirpa Lemu Gelgele (2007) Preliminary Study of Tubular Expansion Using Finite Element Methods. 11th International Research/Expert Conf. "Trends in the Development of Machinery and Associated Technology", TMT 2007; 2007-09-05 - 2007-09-09.

Hirpa Lemu Gelgele (2006) Challenges of Knowledge Discovery and Management. Seminar i Naturvitenskap, UiS; 2006-03-23.

Hirpa Lemu Gelgele (2006) Finite Element Based Genetic Algorithm for Structural Design Optimization. 10th INTERNATIONAL RESEARCH/EXPERT CONFERENCE, TMT 2006; 2006-09-11 - 2006-09-15.

Hirpa Lemu Gelgele (2005) Stress Concentration Analysis in Pressure Vessels Using Finite Element Method. 9th International Research/Expert Conference, TMT 2005; 2005-09-26 - 2005-09-30.

Hirpa Lemu Gelgele (2004) The TSP Scenario for Optimized Sequencing of Machining Operations. The 8th Int. Research/Expert Conference ?Trends in the Development of Machinery and Associated Technology? TMT 2004; 2004-09-15.

Hirpa Lemu Gelgele (2003) Solving Manufacturing System Problems Using Hybrid Genetic Algorithm and Artificial Neural Networks. 7th Int.Research/Expert Conference ”Trends in the Development of Machinery and Associated Technology" TMT 2003; 2003-09-15 - 2003-09-17.

Hirpa Lemu Gelgele; Kesheng Wang (2002) Modelling and Optimation of Machining Process Using Hybrid Computational Intelligence Approach. International conference on Computer Systems and Technologies; 2002-06-20 - 2002-06-21.

Kilde: Nasjonalt vitenarkiv