Hirpa Gelgele Lemu

Professor

Hirpa Gelgele Lemu

Kontakt

Telefon: 5183 2173

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

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Publikasjoner

Vitenskapelige publikasjoner

Abera E. Bekele; Hirpa G. Lemu

(2025)

Tribological behavior investigation of enset/sisal hybrid reinforced composites. I: Journal of Physics: Conference Series (JPCS).

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.

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).

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).

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 N. Gurmu; Krzysztof Wacławiak; Hirpa G. Lemu

(2025)

Predicting the Compressive Properties of Carbon Foam Using Artificial Neural Networks. I: Materials.

Materials.

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).

Journal of Manufacturing and Materials Processing (JMMP).

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.

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.

Journal of Composites Science.

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.

Materials Today Communications.

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.

Scientific Reports.

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).

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.

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.

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.

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.

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.

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.

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).

Results in Engineering (RINENG).

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.

Journal of Composites Science.

ISSN 2504-477X.

Volum 8.

DOI: 10.3390/jcs8090377

Edosa K. Tesema; Hirpa G. Lemu

(2024)

Topology Optimization of Plastic Shredding Machine Blade Carriage.

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.

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.

Applied Mechanics.

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.

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.

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.

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.).

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.

Logistics.

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.

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.

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.

Scientific Reports.

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.

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.

Logistics.

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.

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.

Heliyon.

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.

Journal of Composites Science.

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).

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.

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.

s.143-154.

DOI: 10.1007/978-3-031-49791-9_10

Temesgen Batu Gemechu; Hirpa G. Lemu

(2023)

Application of Composite Materials for Energy Generation Devices. I: Journal of Composites Science.

Journal of Composites Science.

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.

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.

Designs.

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.

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.

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.

Metals.

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.

Journal of Composites Science.

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.

Materials.

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.

Sustainability.

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.

Metals.

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.

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.

Materials.

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.

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.

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.

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.

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.

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.

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.

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.

IOP Conference Series: Materials Science and Engineering.

ISSN 1757-8981.

Volum 1294.

DOI: 10.1088/1757-899X/1294/1/012051

Tomasz Trzepieciński; Temesgen Batu; Fasikaw Kibrete; Hirpa G. Lemu

(2023)

Application of Composite Materials for Energy Generation Devices. I: Journal of Composites Science.

Journal of Composites Science.

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.

Metals.

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.

Materials.

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.

Fibers.

ISSN 2079-6439.

Volum 10.

DOI: 10.3390/fib10020014

Tomasz Trzepieciński; Sherwan Mohammed Najm; Hirpa Gelgele Lemu

(2022)

Current Concepts for Cutting Metal-Based and Polymer-Based Composite Materials. I: Journal of Composites Science.

Journal of Composites Science.

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.

Applied Mechanics.

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).

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.

Applied Mechanics.

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.

Materials Today: Proceedings.

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.

Applied Mechanics.

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.

Energies.

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.

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).

European Chemical Bulletin (ECB).

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.

Advances in Science and Technology Research Journal.

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.

Materials Today: Proceedings.

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.

Journal of Composites Science.

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.

Crystals.

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.

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.

Materials.

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.

Journal of Composites Science.

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.

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.

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).

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.

Materials.

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.

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.

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.

AIMS Materials Science.

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.

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.

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.

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.

Materials Today: Proceedings.

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.

Materials Today: Proceedings.

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.

Nordic Journal of STEM Education.

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.

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.

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.

Metals.

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.

Journal of Composites Science.

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.

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.

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.

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.

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.

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.

IOP Conference Series: Materials Science and Engineering.

ISSN 1757-8981.

Volum 1201.

DOI: 10.1088/1757-899X/1201/1/012033

Tomasz Trzepieciński; 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.

Journal of Composites Science.

ISSN 2504-477X.

Volum 5.

DOI: 10.3390/jcs5080217

Tomasz Trzepieciński; Hirpa G. Lemu; Łukasz Chodoła; Daniel Ficek

(2021)

Modelling Anisotropic Phenomena of Friction of Deep-Drawing Quality Steel Sheets Using Artificial Neural Networks. I: Advances in Materials Science (AMS).

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.

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.

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.

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.

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.

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; Wiesław 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.

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.

Metals.

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).

Results in Engineering (RINENG).

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.

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.

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.

Metals.

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.

Advances in Science and Technology Research Journal.

ISSN 2299-8624.

Volum 14.

s.67-75.

DOI: 10.12913/22998624/118201

Tomasz Trzepieciński; Hirpa G. Lemu

(2020)

Improving Prediction of Springback in Sheet Metal Forming Using Multilayer Perceptron-Based Genetic Algorithm. I: Materials.

Materials.

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.

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.

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.

Results in Materials.

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.

Materials Today: Proceedings.

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).

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.

Materials Today: Proceedings.

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.

Metals.

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.

Results in Materials.

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.

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.

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.

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.

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.

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.

Metals.

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.

Advances in Science and Technology Research Journal.

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.

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.

Procedia Manufacturing.

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.

MATEC Web of Conferences.

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.

MATEC Web of Conferences.

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.

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.

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.

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.

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.

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.

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.

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.

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.

Advances in Science and Technology Research Journal.

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.

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.

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.

Materials.

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.

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.

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.

Materials.

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.

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.

Energies.

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.

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.

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.

Advances in Science and Technology Research Journal.

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.

Advances in Science and Technology Research Journal.

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.

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).

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.

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.

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.

IOP Conference Series: Materials Science and Engineering.

ISSN 1757-8981.

Volum 276.

DOI: 10.1088/1757-899X/276/1/012028

Hirpa G. Lemu; Tomasz Trzepieciński; 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.

Advances in Science and Technology Research Journal.

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.

MATEC Web of Conferences.

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.

Nordic Journal of STEM Education.

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.

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.

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.

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.

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.

Procedia Manufacturing.

ISSN 2351-9789.

Volum 13.

s.724-731.

DOI: 10.1016/j.promfg.2017.09.120

Tomasz Trzepieciński; Hirpa G. Lemu; Romuald Fejkiel

(2017)

Numerical simulation of effect of friction directionality on forming of anisotropic sheets. I: International Journal of Simulation Modelling.

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.

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.

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.

Metals.

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.

Rodrigo L. Banos; Hirpa G. Lemu

(2016)

Design and performance analysis of anchor system for a single-body wave energy converter.

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.

DOI: 10.1115/omae2016-54042

Benjamin ؝ygarden; Mathias Bruset; Hirpa G. Lemu

(2016)

Multibody Dynamics Simulation of ROV Manipulator Designed for Student Competition.

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.

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.

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.

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.

s.89-97.

DOI: 10.2495/IWAMA150111

Hirpa G. Lemu

(2016)

Proposal for design-centered cloud computing in engineering design and manufacturing.

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.

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.

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.

s.126-133.

Tomasz Trzepieciński; Andrzej TRYTEK; Hirpa G. Lemu

(2016)

Study of Frictional Properties of AMS Nickel-Chromium Alloys. I: Key Engineering Materials.

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.

Journal of Mechanical Science and Technology.

ISSN 1738-494X.

Volum 29.

s.2013-2024.

DOI: 10.1007/s12206-015-0422-5

Tomasz Trzepieciński; Anna Bazan; Hirpa G. Lemu

(2015)

Study of Frictional Characteristics of Steel Sheets Used in Automobile Industry. I: International Journal of Automotive Technology.

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.

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.

Applied Mechanics and Materials.

ISSN 1660-9336.

Volum 799-800.

s.618-624.

DOI: 10.4028/www.scientific.net/AMM.799-800.618

Tomasz Trzepieciński; 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.

Applied Mechanics and Materials.

ISSN 1660-9336.

Volum 789-790.

s.3-6.

DOI: 10.4028/www.scientific.net/AMM.789-790.3

Tomasz Trzepieciński; Hirpa G. Lemu

(2015)

Proposal of Experimental-Numerical Method for Friction Description in Sheet Metal Forming. I: Strojniski vestnik.

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.

DOI: 10.1115/IMECE2014-39864

Radostina Petrova; Hirpa G. Lemu

(2014)

Stress and Displacement Analysis of a HAWT Under Time-Variable Wind.

DOI: 10.1115/IMECE2014-37018

Hirpa G. Lemu

(2014)

Virtual Engineering Based Design Integration, Visualization and Validation. I: Journal of Applied Mechanical Engineering.

Journal of Applied Mechanical Engineering.

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.

Advances in Manufacturing.

ISSN 2095-3127.

Volum 2.

s.13-21.

DOI: 10.1007/s40436-014-0056-3

Hirpa G. Lemu; Tomasz Trzepieciński

(2014)

Multiple Regression and Neural Network Based Characterization of Friction in Sheet Metal Forming. I: Advanced Materials Research.

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.

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.

Advances in Manufacturing.

ISSN 2095-3127.

Volum 2.

s.289-294.

DOI: 10.1007/s40436-014-0085-y

Tomasz Trzepieciński; Hirpa G. Lemu

(2014)

Frictional conditions of AA5251 aluminium alloy sheets using drawbead simulator tests and numerical methods. I: Strojniski vestnik.

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.

DOI: 10.1115/IMECE2014-37227

Kambiz Haji Hajikolaei; Amir Safari; Gaofeng Wang; Hirpa G. Lemu

(2014)

Surrogate-assisted Self-accelerated Particle Swarm Optimization.

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.

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.

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.

DOI: 10.1115/GT2013-94093

Hirpa G. Lemu

(2013)

Study of the role of virtual engineering technologies in design.

s.148-155.

Hirpa G. Lemu; Tomasz Trzepieciński

(2013)

Numerical and Experimental Study of Frictional Behavior in Bending Under Tension Test. I: Strojniski vestnik.

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.

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).

Mathematical Problems in Engineering (MPE).

ISSN 1024-123X.

s.1-15.

DOI: 10.1155/2013/716237

Tomasz Trzepieciński; Hirpa G. Lemu

(2012)

Application of Genetic Algorithms to Optimize Neural Networks for Selected Tribological Tests. I: Journal of Mechanics Engineering and Automation.

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.

s.470-479.

DOI: 10.1007/978-3-642-33980-6_51

Hirpa G. Lemu; Tomasz Trzepieciński

(2012)

Study of Material Modeling Strategies for Deformability Analysis of Rectangular Cups. I: Advanced Materials Research.

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.

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.

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.

Amir Safari; Hirpa G. Lemu

(2012)

Optimum nurbs curve fitting for geometry parameterization of gas turbine blade's sections ; part 1: evolutionary optimization techniques.

Hirpa G. Lemu; Jan Frick; Tadeusz Uhl; Wojciech Lisowski; Piotr Piwowarczyk

(2012)

Study on need assessment of mechatronics education in Norway and Poland.

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.

s.421-428.

Radostina Petrova; Hirpa G. Lemu

(2012)

Design study for dynamic behavior of wind turbine blade.

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.

Hirpa G. Lemu

(2011)

Influence of Interference Fit and Surface Roughness on Contact Resistance of Tubing Connections. I: Journal of Mechanics Engineering and Automation.

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.

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.

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.

s.149-156.

Hirpa Lemu Gelgele

(2010)

Study of Design Optimization Using Finite Element Method and Genetic Algorithm.

s.127-134.

Hirpa Lemu Gelgele; Jiregna Hirko Foggi

(2010)

Finite Element Based Stress Prediction for Design of Composite Materials.

s.149-156.

Hirpa Lemu Gelgele

(2006)

Study on CAD Integrated Analysis for Complex Structures.

s.673-678.

Bøker og kapitler

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.

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

(2024)

Analytical and experimental methods in mechanical and civil engineering : Contributions of the 1st olympiad in engineering science (OES 2023).

Hirpa G. Lemu

(2012)

Anisotropy Research: New Developments.

Formidling

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).

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. I: IWAMA23 conference.

IWAMA23 conference.

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. I: IWAMA23 conference.

IWAMA23 conference.

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. I: National Conference for Additive Manufacturing 2023.

National Conference for Additive Manufacturing 2023.

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. I: IWAMA Conference 2022.

IWAMA Conference 2022.

Yosef Wakjira Adugna; Hirpa G. Lemu

(2022)

Comparative Evaluation of Stress Concentration Generated on Human Femur Structure Using Meshfree Software. I: IWAMA Conference 2022.

IWAMA Conference 2022.

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: COTech Conference.

COTech Conference.

Iyasu T Jiregna; Hirpa G. Lemu

(2021)

Thermal stress analysis of disc brake using analytical and numerical methods. I: COTech Conference.

COTech Conference.

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: COTech Conference.

COTech Conference.

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: COTech Conference.

COTech Conference.

Yohannes Regassa; Hirpa G. Lemu; Belete Sirhabizu

(2021)

Burst strength analysis of composite overwrapped pressure vessel using finite element method. I: COTech Conference.

COTech Conference.

Goftila Sirata; Hirpa G. Lemu; Krzysztof Waclawiak; Yohanis D. Jelila

(2021)

Study of rail-wheel contact problem by analytical and numerical approaches. I: COTech Conference.

COTech Conference.

Bao Nguyen; Hirpa G. Lemu; Ole Gabrielsen; Idriss El-Thalji

(2021)

Characterization of acoustic emission signals under 3-point bending test. I: COTech Conference.

COTech Conference.

Yohanis D. Jelila; Hirpa G. Lemu; Wiesław pamula; Goftila Sirata

(2021)

Fatigue life analysis of wheel-rail contacts at railway turnouts using finite element modelling approach. I: COTech Conference.

COTech Conference.

Yosef Adugna Wakjira; Hirpa G. Lemu; Adugna Deressa Akessa

(2021)

Overview study on challenges of additive manufacturing for a healthcare application. I: COTech conference.

COTech conference.

Frankor T. Daba; Hirpa Gelgele Lemu

(2021)

Conceptual modelling and topology optimization framework of tower crane hook: A case study. I: IWAMA 2021.

IWAMA 2021.

Getachew A. Ambaye; Hirpa Gelgele Lemu

(2021)

Numerical stress analysis and fatigue life prediction of the classical external Geneva mechanism. I: IWAMA 2021.

IWAMA 2021.

Jonathan B. Dawit; Hirpa Gelgele Lemu; Samrawit A. Tewelde

(2021)

Tensile and Flexural Properties of Acacia Tortilis/Glass Fiber Reinforced Hybrid Composites. I: IWAMA 2021.

IWAMA 2021.

Getachew A. Ambaye; Hirpa Gelgele Lemu

(2020)

Dynamic analysis of spur gear with backlash using ADAMS. I: International Conference & Exposition on Mechanical, Material and Manufacturing Technology(ICE3MT2020).

International Conference & Exposition on Mechanical, Material and Manufacturing Technology(ICE3MT2020).

Hirpa Gelgele Lemu

(2020)

Application of High-dimensional and Nature Inspired Approaches to Design Optimization of Energy Converters. I: 8th EAI International Conference on Advancements of Science and Technology.

8th EAI International Conference on Advancements of Science and Technology.

Yohanis D. Jelila; Hirpa Gelgele Lemu

(2020)

Study of wheel-rail contacts at railway turnout using multibody dynamics simulation approach. I: 10th International Workshop of Advanced Manufacturing and Automation (IWAMA 2020).

10th International Workshop of Advanced Manufacturing and Automation (IWAMA 2020).

Nigatu D. Tilahun; Hirpa Gelgele Lemu

(2020)

Mechanical Vibration Analysis of Fiber Reinforced Polymer Composite Beams Using Analytical and Numerical Methods. I: 8th EAI International Conference on Advancements of Science and Technology.

8th EAI International Conference on Advancements of Science and Technology.

Yohannes Regassa; Hirpa Gelgele Lemu; Belete Sirabizuh

(2020)

Nature Inspired Design in Fiber Orientation Trends for Reinforcement of Composites. I: 8th EAI International Conference on Advancements of Science and Technology.

8th EAI International Conference on Advancements of Science and Technology.

Hirpa Gelgele Lemu

(2020)

Advances, opportunities and limitations of Additive Manufacturing Technology. I: International Conference & Exposition on Mechanical, Material and Manufacturing Technology(ICE3MT2020).

International Conference & Exposition on Mechanical, Material and Manufacturing Technology(ICE3MT2020).

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: International Conference & Exposition on Mechanical, Material and Manufacturing Technology(ICE3MT2020).

International Conference & Exposition on Mechanical, Material and Manufacturing Technology(ICE3MT2020).

Abdulbasit Mohammed; Hirpa Gelgele Lemu; Belete Sirabizuh

(2020)

Statistical Analysis of Ethiopian Wind Power Potential at Selected Sites. I: 8th EAI International Conference on Advancements of Science and Technology.

8th EAI International Conference on Advancements of Science and Technology.

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. I: 8th EAI International Conference on Advancements of Science and Technology.

8th EAI International Conference on Advancements of Science and Technology.

Temesgen Batu; Hirpa Gelgele Lemu

(2020)

Fatigue life study of false banana/glass fiber reinforced composite for wind turbine blade application. I: 10th International Workshop of Advanced Manufacturing and Automation (IWAMA2020).

10th International Workshop of Advanced Manufacturing and Automation (IWAMA2020).

Getachew A. Ambaye; Hirpa Gelgele Lemu

(2020)

Effect of backlash on transmission error and time varying mesh stiffness. I: 10th International workshop of Advanced Manufacturing and Automation (IWAMA2020).

10th International workshop of Advanced Manufacturing and Automation (IWAMA2020).

Adugna Deressa Akessa; Aboma Wagari Gebisa; Hirpa G. Lemu

(2019)

Numerical simulation of FDM manufactured parts by adopting approaches in composite material simulation. I: Computational Methods in Offshore Technology.

Computational Methods in Offshore Technology.

Yohannes Regassa; Hirpa G. Lemu; Belete Sirabizuh

(2019)

Trends of using polymer composite materials in additive manufacturing. I: 9th International Scientific Conference - Research and Development of Mechanical Elements and Systems (IRMES 2019).

9th International Scientific Conference - Research and Development of Mechanical Elements and Systems (IRMES 2019).

Temesgen Batu; Hirpa G. Lemu

(2019)

Comparative study of the effect of chord length computation methods in design of wind turbine blade. I: 9th International Workshop on Advanced Manufacturing and Automation.

9th International Workshop on Advanced Manufacturing and Automation.

Øyvind Karlsen; Hirpa G. Lemu

(2019)

Fretting fatigue and wear of mechanical joints: Literature study. I: COTech & OGTech conference.

COTech & OGTech conference.

Øyvind Karlsen; Hirpa G. Lemu

(2019)

On modelling techniques for Mechanical joints: Literature study. I: 9th International workshop on advanced manufacturing and automation.

9th International workshop on advanced manufacturing and automation.

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: 9th Int. Conf. on Manufacturing Science and Education.

9th Int. Conf. on Manufacturing Science and Education.

Tesfaye Olana Terefe; Hirpa G. Lemu; Addisu K/Mariam

(2019)

Review and synthesis of a walking machine (Robot) leg mechanism. I: 9th Int. Conf. on Manufacturing Science and Education.

9th Int. Conf. on Manufacturing Science and Education.

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: ISOPE 2019.

ISOPE 2019.

Mostafa Ahmed Atteya; Ove Mikkelsen; Hirpa G. Lemu

(2019)

State-of-the-art of crack propagation modelling in tubular joints. I: COTech & OGTech conference.

COTech & OGTech conference.

Abdulbasit M Aliyi; Hirpa G. Lemu

(2019)

Case study on topology optimized design for additive manufacturing. I: 9th International Scientific Conference - Research and Development of Mechanical Elements and Systems (IRMES 2019).

9th International Scientific Conference - Research and Development of Mechanical Elements and Systems (IRMES 2019).

Thomasz Trzepiecinski; Hirpa G. Lemu

(2018)

FEM-based assessment of wear of stamping die. I: The International Conference on Materials Research and Innovation.

The International Conference on Materials Research and Innovation.

Aboma Wagari Gebisa; Hirpa G. Lemu

(2018)

Effect of Process Parameters on Compressive Properties of ULTEM 9085 Produced by FDM Process. I: IMECE2018.

IMECE2018.

Aboma Wagari Gebisa; Hirpa G. Lemu

(2018)

Additive Manufacturing for the Manufacture of Gas Turbine Engine Components: Literature Review and Future Perspectives. I: Turbo Expo 2018.

Turbo Expo 2018.

Karsten Mikal Kopperstad; Hirpa G. Lemu

(2018)

Design and Performance Study of Additive Manufactured Thrusters for Remotely Operated Underwater Vehicle. I: International Society of Offshore and Polar Engineers (ISOPE).

International Society of Offshore and Polar Engineers (ISOPE).

Yohannes Regassa; Hirpa G. Lemu

(2018)

Multibody System Modelling and Simulation: Case Study on Excavator Manipulator. I: IWAMA 2018.

IWAMA 2018.

Hirpa G. Lemu

(2018)

On Opportunities and Limitations of Additive Manufacturing Technology for Industry 4.0 Era. I: IWAMA2018.

IWAMA2018.

Yohannes Regassa; Belete Sirabizuh; Hirpa G. Lemu

(2018)

Review and Analysis of Processing Principles and Applications of Self-healing Composite Materials. I: IWAMA 2018.

IWAMA 2018.

Abdulbasit Mohammed; Hirpa G. Lemu

(2018)

Modelling Wind Turbine System Using Bond Graph Method. I: IWAMA2018.

IWAMA2018.

Hirpa G. Lemu

(2018)

Influence of 3D Printing FDM Process Parameters on Tensile Property of ULTEM 9085.. I: GCMM2018.

GCMM2018.

Kristen Rege; Hirpa G. Lemu

(2017)

A review of fatigue crack propagation modelling techniques using FEM and XFEM. I: First Conference of Computational Methods in Offshore Technology - COTech 2017.

First Conference of Computational Methods in Offshore Technology - COTech 2017.

Adugna Deressa Akessa; Hirpa G. Lemu; Aboma Wagari Gebisa

(2017)

Mechanical Property Characterization of Additive Manufactured ABS Material Using Design of Experiment Approach. I: ASME 2017 International Mechanical Engineering Congress and Exposition.

ASME 2017 International Mechanical Engineering Congress and Exposition.

Hirpa G. Lemu

(2017)

Assessment and Analysis of Structural Health Monitoring Techniques for Rotating Machines. I: International Society of Offshore and Polar Engineers Conference, ISOPE 2017,.

International Society of Offshore and Polar Engineers Conference, ISOPE 2017,.

Hirpa G. Lemu

(2017)

On Competition-driven Teaching of Multidisciplinary Engineering Education: Implementation cases at University of Stavanger. I: MNT Conference.

MNT Conference.

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. I: ISOPE 2017 International Ocean and Polar Engineering.

ISOPE 2017 International Ocean and Polar Engineering.

Thomasz Trzepiecinski; Romuald Fejkiel; Hirpa G. Lemu

(2017)

Experimental Investigation of Frictional Resistances in the Drawbead Region of the Sheet Metal Forming Processes. I: 4th AMMSE 2017.

4th AMMSE 2017.

Jose V. Taboada; Hirpa G. Lemu

(2016)

Analysis of Wave Energy Sources in the North Atlantic Waters in View of Design Challenges. I: 35th International Conference on Ocean, Offshore and Arctic Engineering OMAE 2016.

35th International Conference on Ocean, Offshore and Arctic Engineering OMAE 2016.

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: Turboexpo 2016,.

Turboexpo 2016,.

Endashaw Tesfaye Woldemariam; Hirpa G. Lemu

(2016)

Comparative analysis of computational methods in Fluid-Structure Interaction: Temporal descretization and coupling techniques. I: IWAMA – International Workshop of Advanced Manufacturing and Automation.

IWAMA – International Workshop of Advanced Manufacturing and Automation.

Petrova Radostina; Mihailov Assen; Hirpa G. Lemu

(2015)

Study of a Vertical Axis Wind Turbine Using Fluid Particle Trajectory. I: ICMET 2015.

ICMET 2015.

Tomasz Trzepieciński; Hirpa G. Lemu

(2015)

A hybrid Method for Description of Frictional Resistance using Modified Bending Under Tension Friction Test. I: BALMATTRIB 2015.

BALMATTRIB 2015.

Hirpa G. Lemu

(2015)

Proposal for design-centered cloud computing in engineering design and manufacturing. I: IWAMA2015.

IWAMA2015.

Endashaw Tesfaye Woldemariam; Hirpa G. Lemu

(2015)

Nonlinear isogeometric analysis in simulation-based design optimization: State-of-the-art analysis. I: IWAMA2015.

IWAMA2015.

Petrova Radostina; Hirpa G. Lemu

(2015)

Adaptability of surgical robot to guide its clamp operation along predefined path. I: IWAMA2015.

IWAMA2015.

Larion Ioan; Hirpa G. Lemu

(2014)

Study of Coanda effect applied to vertical Wind turbine blades. I: ASME 2014 International Mechanical Engineering Congress and Exposition IMECE2014.

ASME 2014 International Mechanical Engineering Congress and Exposition IMECE2014.

Petrova Radostina; Hirpa G. Lemu

(2014)

Stress and displacement analysis of a HAWT under time-variable wind. I: ASME 2014 International Mechanical Engineering Congress and Exposition IMECE2014.

ASME 2014 International Mechanical Engineering Congress and Exposition IMECE2014.

Huluka Alemayehu W.; Hirpa G. Lemu

(2014)

Study and development of vehicle collision detection system. I: ASME 2014 International Mechanical Engineering Congress and Exposition IMECE2014.

ASME 2014 International Mechanical Engineering Congress and Exposition IMECE2014.

Amir Safari; Kambiz H. Hajikolaei; Gary G. Wang; Hirpa G. Lemu

(2014)

Surrogate-assisted Self-accelerated Particle Swarm Optimization. I: 10th AIAA Multidisciplinary Design Optimization Conference.

10th AIAA Multidisciplinary Design Optimization Conference.

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. I: 1st International Conference on Renewable Energies Offshore.

1st International Conference on Renewable Energies Offshore.

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. I: ASME IMECE 2013 Conference.

ASME IMECE 2013 Conference.

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. I: ASME Turbo Expo 2013.

ASME Turbo Expo 2013.

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. I: 10th World Congress on Structural and Multidisciplinary Optimization.

10th World Congress on Structural and Multidisciplinary Optimization.

Hirpa G. Lemu

(2013)

Multibody dynamics simulation in design and performance analysis of energy conversion systems – a review. I: NAFEMS Nordic Seminar 2013.

NAFEMS Nordic Seminar 2013.

Amir Safari; Hirpa G. Lemu; Henning Severson

(2012)

Geometric Modeling and Numerical Simulation of Airfoil Shapes Using Integrated MATLAB® and COMSOL Multiphysics®. I: COMSOL Conference 2012.

COMSOL Conference 2012.

Amir Safari; Hirpa G. Lemu

(2012)

Review of Recent Researches on Gas Turbine Blades Shape Optimization Techniques and Approaches. I: Recent Advances and Challenges in Energy, RACE - 2012, Published in International Journal of Earth Sciences and Engineering, ISSN 0974-5904.

Recent Advances and Challenges in Energy, RACE - 2012, Published in International Journal of Earth Sciences and Engineering, ISSN 0974-5904.

Amir Safari; Hirpa G. Lemu

(2012)

Optimum NURBS curve fitting for geometry parameterization of gas turbine blades’ sections: Part I – Evolutionary optimization techniques. I: ASME 2012 International Mechanical Engineering Congress & Exposition.

ASME 2012 International Mechanical Engineering Congress & Exposition.

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: International mechanical engineering congress and exposition.

International mechanical engineering congress and exposition.

Hirpa G. Lemu

(2011)

Tolerances in Design and Strain Beyond Elastic Limit. I: Competence Development and Experience Sharing.

Competence Development and Experience Sharing.

Hirpa G. Lemu

(2011)

Transmission System Design and 2D/3D Finite Element Analysis. I: Competence Development and Experience Sharing.

Competence Development and Experience Sharing.

Hossein Said; Amir Safari; Hirpa G. Lemu

(2011)

A Quantitative Prediction of Axial Compressor Performance Deterioration Using Fouling Full 3D Modeling. I: International Conference on Applied Energy.

International Conference on Applied Energy.

Hirpa G. Lemu; Tomasz Trzepieciński

(2011)

FEM Based Deformability Analysis of Metal Forming: influence of material models and analysis approaches. I: Proc. of MESIC 2011: 4th Manufacturing Society International Conference.

Proc. of MESIC 2011: 4th Manufacturing Society International Conference.

Tadeusz Uhl; Wojciech Lisowski; Daniel Prosak; Jan Frick; Hirpa G. Lemu

(2011)

Analysis of Companies' Needs Related to the Mechatronics Study Graduates. I: Summary Conference on Project FSS/2008/x/D5/W/0045.

Summary Conference on Project FSS/2008/x/D5/W/0045.

Hirpa Lemu Gelgele

(2010)

Experimental study and Finite Element Analysis of Expandable Tubulars. I: utenTitteltekst.

utenTitteltekst.

Hirpa Lemu Gelgele

(2010)

Finite Element Methods in Strength Analysis of Orthopedics Devices. I: Annual Conference of Norwegian Society of Orthopedics Engineers.

Annual Conference of Norwegian Society of Orthopedics Engineers.

Hirpa Lemu Gelgele

(2010)

How to Use ANSYS for Strength Analysis - Application Examples for Students and Teaching Staff. I: utenTitteltekst.

utenTitteltekst.

Hirpa Lemu Gelgele

(2010)

Rapid Prototyping - A manufacturing Tool for Orthopedics Devices. I: Annual Conference of Norwegian Society of Orthopedics Engineers.

Annual Conference of Norwegian Society of Orthopedics Engineers.

Hirpa Lemu Gelgele

(2009)

Study of Contact Area and Contact Resistance in Contact Design of Tubing Connections. I: 13th International Research/Expert Conference on Trends in the Development of Machinery and Associated Technology.

13th International Research/Expert Conference on Trends in the Development of Machinery and Associated Technology.

Hirpa Lemu Gelgele

(2009)

Design and Analysis of Machines and Mechanisms. I: utenTitteltekst.

utenTitteltekst.

Hirpa Lemu Gelgele

(2007)

Preliminary Study of Tubular Expansion Using Finite Element Methods. I: 11th International Research/Expert Conf. "Trends in the Development of Machinery and Associated Technology", TMT 2007.

11th International Research/Expert Conf. "Trends in the Development of Machinery and Associated Technology", TMT 2007.

Hirpa Lemu Gelgele

(2006)

Challenges of Knowledge Discovery and Management. I: Seminar i Naturvitenskap, UiS.

Seminar i Naturvitenskap, UiS.

Hirpa Lemu Gelgele

(2006)

Finite Element Based Genetic Algorithm for Structural Design Optimization. I: 10th INTERNATIONAL RESEARCH/EXPERT CONFERENCE, TMT 2006.

10th INTERNATIONAL RESEARCH/EXPERT CONFERENCE, TMT 2006.

Hirpa Lemu Gelgele

(2005)

Stress Concentration Analysis in Pressure Vessels Using Finite Element Method. I: 9th International Research/Expert Conference, TMT 2005.

9th International Research/Expert Conference, TMT 2005.

Hirpa Lemu Gelgele

(2004)

The TSP Scenario for Optimized Sequencing of Machining Operations. I: The 8th Int. Research/Expert Conference ?Trends in the Development of Machinery and Associated Technology? TMT 2004.

The 8th Int. Research/Expert Conference ?Trends in the Development of Machinery and Associated Technology? TMT 2004.

Hirpa Lemu Gelgele

(2003)

Solving Manufacturing System Problems Using Hybrid Genetic Algorithm and Artificial Neural Networks. I: 7th Int.Research/Expert Conference ”Trends in the Development of Machinery and Associated Technology" TMT 2003.

7th Int.Research/Expert Conference ”Trends in the Development of Machinery and Associated Technology" TMT 2003.

Hirpa Lemu Gelgele; Kesheng Wang

(2002)

Modelling and Optimation of Machining Process Using Hybrid Computational Intelligence Approach. I: International conference on Computer Systems and Technologies.

International conference on Computer Systems and Technologies.

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