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Hirpa Gelgele Lemu

Professor

Det teknisk- naturvitenskapelige fakultet
Institutt for maskin, bygg og materialteknologi
KE E-208
Bio

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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Publications
  • Vitenskapelige publikasjoner
    • Mohammed, Abdulbasit; Lemu, Hirpa Gelgele; Sirahbizu, Belete

      (2021)

      Determining Optimum Rotary Blade Design for Wind-Powered Water-Pumping Systems for Local Selected Sites.

      Strojniski vestnik

      ISSN 0039-2480.

      Volum 67.

      Hefte 5.

      s.214-222.

      DOI: 10.5545/sv-jme.2021.7104

    • Tilahun, Nigato D.; Lemu, Hirpa Gelgele

      (2021)

      Mechanical vibration analysis of fiber reinforced polymer composite beams using analytical and numerical methods. I: 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

    • Helle, Robin Heimli; Lemu, Hirpa Gelgele

      (2021)

      A case study on use of 3D scanning for reverse engineering and quality control.

      Materials Today: Proceedings

      ISSN 2214-7853.

      Volum 45.

      s.5255-5262.

      DOI: 10.1016/j.matpr.2021.01.828

    • Regassa, Yohannes; Lemu, Hirpa Gelgele; Sirabizuh, Belete; Rahimeto, Samuel

      (2021)

      Studies on the Geometrical Design of Spider Webs for Reinforced Composite Structures.

      Journal of Composites Science

      ISSN 2504-477X.

      Volum 5.

      DOI: 10.3390/jcs5020057

    • Batu, Temesgen; Lemu, Hirpa Gelgele; G. Michael, Elias

      (2021)

      Multi objective parametric optimization and composite material performance study for master leaf spring.

      Materials Today: Proceedings

      ISSN 2214-7853.

      Volum 45.

      s.5347-5353.

      DOI: 10.1016/j.matpr.2021.01.925

    • Lemu, Hirpa Gelgele; Mikkelsen, Ove

      (2021)

      Experience in Use of 3D Printing in Engineering Education at University of Stavanger.

      Nordic Journal of STEM Education

      ISSN 2535-4574.

      Volum 5.

      Hefte 1.

      DOI: 10.5324/njsteme.v5i1.3934

    • Lemu, Hirpa Gelgele; Karlsen, Øyvind

      (2021)

      Questionnarie-based Survey of Experiences with the Use of Expanding PIN Systems in Mechanical Joints.

      Results in Engineering (RINENG)

      ISSN 2590-1230.

      Volum 9.

      DOI: 10.1016/j.rineng.2021.100212

    • Mohammed, Abdulbasit; Lemu, Hirpa Gelgele; Sirahbizu, Belete

      (2021)

      Statistical analysis of Ethiopian wind power potential at selected sites. I: 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

    • Regassa, Yohannes; Lemu, Hirpa G.; Sirhabizu, Belete

      (2021)

      Investigation of spider web oriented composite fabrics burst strength.

      AIMS Materials Science

      ISSN 2372-0484.

      Volum 8.

      Hefte 4.

      s.622-639.

      DOI: 10.3934/matersci.2021038

    • Tolcha, Mesay Alemu; Jiru, Moera Gutu; Lemu, Hirpa Gelgele

      (2021)

      Experimental Investigation of Al-CuMgMn Alloy Developed by Laser Beam Surface Modification for Wear Resistance.

      Metals

      ISSN 2075-4701.

      Volum 11.

      Hefte 5.

      s.1-15.

      DOI: 10.3390/met11050712

    • Regassa, Yohannes; Lemu, Hirpa Gelgele; Sirabizuh, Belete

      (2021)

      Nature inspired design in fiber orientation trends for reinforcement of composites. I: 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

    • Alemyayehu, Samrawit; Regassa, Yohannes; Yoseph, Bisrath; Lemu, Hirpa Gelgele

      (2021)

      Mechanical properties characterization of water hyacinth (Emboch) plant for use as fiber reinforced polymer composite. I: 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

    • Jelila, Yohanis D.; Lemu, Hirpa G.

      (2021)

      Study of wheel-rail contacts at railway turnout using multibody dynamics simulation approach. I: Advanced manufacuring and automation X.

      Springer Nature

      ISBN 9789813363175.

      s.371-379.

      DOI: 10.1007%2F978-981-33-6318-2_46

    • Akhtar, Muhammad Maaz; Karlsen, Øyvind; Lemu, Hirpa G.

      (2021)

      Study of Bondura® Expanding PIN System – Combined Axial and Radial Locking System .

      Strojniski vestnik

      ISSN 0039-2480.

      Volum 67.

      Hefte 12.

      s.625-634.

      DOI: 10.5545/sv-jme.2021.7306

    • Jelila, Yohanis D.; Lemu, Hirpa G.; Pamula, Wiesław; Sirata, Goftila

      (2021)

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

      IOP Conference Series: Materials Science and Engineering

      ISSN 1757-8981.

      Volum 1201.

      DOI: 10.1088/1757-899X/1201/1/012047

    • Nguyen, Bao Gia Ngoc; Lemu, Hirpa G.; Gabrielsen, Ole; El-Thalji, Idriss

      (2021)

      Characterization of acoustic emission signals under 3-point bending test.

      IOP Conference Series: Materials Science and Engineering

      ISSN 1757-8981.

      Volum 1201.

      DOI: 10.1088/1757-899X/1201/1/012034

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

      (2021)

      Study of rail-wheel contact problem by analytical and numerical approaches.

      IOP Conference Series: Materials Science and Engineering

      ISSN 1757-8981.

      Volum 1201.

      DOI: 10.1088/1757-899X/1201/1/012035

    • Villoria, Bruno; Siriwardane , Sudath C.; Lemu, Hirpa G.

      (2021)

      Review on fatigue life assessment methods for welded joints in orthotropic steel decks of long-span bridges.

      IOP Conference Series: Materials Science and Engineering

      ISSN 1757-8981.

      Volum 1201.

      DOI: 10.1088/1757-899X/1201/1/012036

    • Regassa, Yohannes; Lemu, Hirpa G.; Sirhabizu, Belete

      (2021)

      Burst strength analysis of composite overwrapped pressure vessel using finite element method.

      IOP Conference Series: Materials Science and Engineering

      ISSN 1757-8981.

      Volum 1201.

      DOI: 10.1088/1757-899X/1201/1/012029

    • Karlsen, Øyvind; Lemu, Hirpa G.

      (2021)

      Safety related study of Expanding Pin systems application in lifting and drilling equipment within Construction, Offshore, and Marine sectors.

      IOP Conference Series: Materials Science and Engineering

      ISSN 1757-8981.

      Volum 1201.

      DOI: 10.1088/1757-899X/1201/1/012026

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

      (2021)

      Modelling Anisotropic Phenomena of Friction of Deep-Drawing Quality Steel Sheets Using Artificial Neural Networks.

      Advances in Materials Science

      ISSN 2083-4799.

      Volum 21.

      Hefte 3.

      DOI: 10.2478/adms-2021-0016

    • Jiregna, Iyasu T; Lemu, Hirpa G.

      (2021)

      Thermal stress analysis of disc brake using analytical and numerical methods.

      IOP Conference Series: Materials Science and Engineering

      ISSN 1757-8981.

      Volum 1201.

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

    • Trzepiecinski, Tomasz; dell’Isola, Francesco; Lemu, Hirpa G.

      (2021)

      Multiphysics Modeling and Numerical Simulation in Computer-Aided Manufacturing Processes.

      Metals

      ISSN 2075-4701.

      Volum 11.

      Hefte 1.

      DOI: 10.3390/met11010175

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

      (2021)

      Overview study on challenges of additive manufacturing for a healthcare application.

      IOP Conference Series: Materials Science and Engineering

      ISSN 1757-8981.

      Volum 1201.

      DOI: 10.1088/1757-899X/1201/1/012041

    • Tura, Amanuel; Mamo, Hanna; Jelila, Yohannis; Lemu, Hirpa G.

      (2021)

      Experimental investigation and ANN prediction for part quality improvement of fused deposition modeling parts.

      IOP Conference Series: Materials Science and Engineering

      ISSN 1757-8981.

      Volum 1201.

      DOI: 10.1088/1757-899X/1201/1/012031

    • Trzepieciński, Tomasz; Najm, Sherwan M; Sbayti, Manel; Belhadjsalah, Hedi; Szpunar, Marcin; Lemu, Hirpa G.

      (2021)

      New Advances and Future Possibilities in Forming Technology of Hybrid Metal–Polymer Composites Used in Aerospace Applications.

      Journal of Composites Science

      ISSN 2504-477X.

      Volum 5.

      Hefte 8.

      DOI: 10.3390/jcs5080217

    • Ambaye, Getachew A.; Lemu, Hirpa G.

      (2021)

      Effect of backlash on transmission error and time varying mesh stiffness. I: Advanced manufacuring and automation X.

      Springer Nature

      ISBN 9789813363175.

      s.18-28.

      DOI: 10.1007/978-981-33-6318-2_3

    • Batu, Temesgen; Lemu, Hirpa G.

      (2021)

      Fatigue life study of false banana/glass fiber reinforced composite for wind turbine blade application. I: Advanced manufacuring and automation X.

      Springer Nature

      ISBN 9789813363175.

      s.29-40.

      DOI: 10.1007/978-981-33-6318-2_4

    • Bekele, Abera E.; Lemu, Hirpa G.; Jiru, Moera G.

      (2021)

      Experimental study of physical, chemical and mechanical properties of enset and sisal fibers.

      Polymer testing

      ISSN 0142-9418.

      Volum 106.

      DOI: 10.1016/j.polymertesting.2021.107453

    • Trzepieciński, Tomasz; Lemu, Hirpa G.

      (2020)

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

      Materials

      ISSN 1996-1944.

      Volum 13.

      DOI: 10.3390/ma13143129

    • Batu, Temesgen; Lemu, Hirpa G.; Sirhabizuh, Belete

      (2020)

      Study of the Performance of Natural Fiber Reinforced Composites for Wind Turbine Blade Applications.

      Advances in Science and Technology Research Journal

      ISSN 2299-8624.

      Volum 14.

      Hefte 2.

      s.67-75.

      DOI: 10.12913/22998624/118201

    • Ambaye, Getachew A.; Lemu, Hirpa G.

      (2020)

      Numerical Study of Effect of Backlash on Flash Temperature of Spur Gear.

      International Review of Mechanical Engineering (IREME)

      ISSN 1970-8734.

      Volum 14.

      Hefte 11.

      s.684-692.

      DOI: 10.15866/ireme.v14i11.19763

    • Dawit, Jonathan B.; Lemu, Hirpa Gelgele; Regassa, Yohannes; Akessa, Adugna Deressa

      (2020)

      Investigation of the mechanical properties of Acacia tortilis fiber reinforced natural composite.

      Materials Today: Proceedings

      ISSN 2214-7853.

      DOI: 10.1016/j.matpr.2020.09.308

    • Batu, Temesgen; Lemu, Hirpa Gelgele

      (2020)

      Investigation of mechanical properties of false banana/glass fiber reinforced hybrid composite materials.

      Results in Materials

      ISSN 2590-048X.

      Volum 8.

      DOI: 10.1016/j.rinma.2020.100152

    • Trzepiecinski, Thomasz; Lemu, Hirpa G.

      (2020)

      Effect of Lubrication on Friction in Bending under Tension Test-Experimental and Numerical Approach.

      Metals

      ISSN 2075-4701.

      Volum 10.

      Hefte 4.

      DOI: 10.3390/met10040544

    • Dawit, Jonathan B.; Regassa, Yohannes; Lemu, Hirpa G.

      (2020)

      Property characterization of acacia tortilis for natural fiber reinforced polymer composite.

      Results in Materials

      ISSN 2590-048X.

      Volum 5.

      DOI: 10.1016/j.rinma.2019.100054

    • Trzepiecinski, Tomasz; Lemu, Hirpa G.

      (2020)

      Recent developments and trends in the friction testing for conventional sheet metal forming and incremental sheet forming.

      Metals

      ISSN 2075-4701.

      Volum 10.

      Hefte 1.

      s.1-34.

      DOI: 10.3390/met10010047

    • Ambaye, Getachew A.; Lemu, Hirpa Gelgele

      (2020)

      Dynamic analysis of spur gear with backlash using ADAMS.

      Materials Today: Proceedings

      ISSN 2214-7853.

      DOI: 10.1016/j.matpr.2020.09.309

    • Karlsen, Øyvind; Lemu, Hirpa G.

      (2020)

      On modelling techniques for mechanical joints : Literature study. I: Advanced manufacturing and automation IX.

      Springer

      ISBN 9789811523410.

      s.116-125.

      DOI: 10.1007/978-981-15-2341-0_15

    • Batu, Temesgen; Lemu, Hirpa G.

      (2020)

      Comparative study of the effect of chord length computation methods in design of wind turbine blade. I: Advanced manufacturing and automation IX.

      Springer

      ISBN 9789811523410.

      s.106-115.

      DOI: 10.1007/978-981-15-2341-0_14

    • Regassa, Yohannes; Sirabizuh, Belete; Lemu, Hirpa G.

      (2019)

      Review and Analysis of Processing Principles and Applications of Self-healing Composite Materials. I: Advanced Manufacturing and Automation VIII Proceedings IWAMA 2018.

      Springer

      ISBN 978-981-13-2375-1.

      s.159-167.

      DOI: 10.1007/978-981-13-2375-1_21

    • Regassa, Yohannes; Lemu, Hirpa G.

      (2019)

      Multibody System Modelling and Simulation: Case Study on Excavator Manipulator. I: Advanced Manufacturing and Automation VIII Proceedings IWAMA 2018.

      Springer

      ISBN 978-981-13-2375-1.

      s.628-635.

      DOI: 10.1007/978-981-13-2375-1_79

    • Marek, Kowalik; Trzepiecinski, Thomasz; Lemu, Hirpa G.

      (2019)

      Effect of Pressing Parameters on the Quality of Joint Formation of Heat Exchanger Fins with the Base Plate.

      MATEC Web of Conferences

      ISSN 2261-236X.

      Volum 290.

      DOI: 10.1051/matecconf/201929003009

    • Lemu, Hirpa G.

      (2019)

      On Opportunities and Limitations of Additive Manufacturing Technology for Industry 4.0 Era. I: Advanced Manufacturing and Automation VIII Proceedings IWAMA 2018.

      Springer

      ISBN 978-981-13-2375-1.

      s.106-113.

      DOI: 10.1007/978-981-13-2375-1_15

    • Woldemariam, Endashaw Tesfaye; Lemu, Hirpa G.

      (2019)

      A machine Learning based framework for model approximation followed by design Optimization for expensive numerical simulation-based Optimization problems. I: The 29th International Ocean and Polar Engineering Conference .

      International Society of Offshore & Polar Engineers

      ISBN 978-1-880653-85-2.

      s.943-950.

    • Trzepiecinski, Thomasz; Lemu, Hirpa G.

      (2019)

      FEM-based assessment of wear of stamping die.

      IOP Conference Series: Materials Science and Engineering

      ISSN 1757-8981.

      Volum 526.

      DOI: 10.1088/1757-899X/526/1/012002

    • Terefe, Tesfaye O.; Lemu, Hirpa G.; K/Mariam, Addisu; Tuli, Tadele B.

      (2019)

      Kinematic Modeling and Analysis of a Walking Machine (Robot) Leg Mechanism on a Rough Terrain.

      Advances in Science and Technology Research Journal

      ISSN 2299-8624.

      Volum 13.

      Hefte 3.

      s.43-53.

      DOI: 10.12913/22998624/109792

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

      (2019)

      Review and synthesis of a walking machine (Robot) leg mechanism.

      MATEC Web of Conferences

      ISSN 2261-236X.

      Volum 290.

      DOI: 10.1051/matecconf/201929008012

    • Kebede, Bisrat M.; Lemu, Hirpa G.

      (2019)

      Design, simulation and production of hydraulic briquette press for metal chips.

      Advances in Science and Technology Research Journal

      ISSN 2299-8624.

      Volum 13.

      Hefte 2.

      s.24-30.

      DOI: 10.12913/22998624/105809

    • Woldemariam, Endashaw Tesfaye; Lemu, Hirpa G.

      (2019)

      Numerical simulation-based effect characterization and design Optimization of micro cross-flow turbine.

      Strojniski vestnik

      ISSN 0039-2480.

      Volum 65.

      Hefte 6.

      s.386-397.

      DOI: 10.5545/sv-jme.2018.5901

    • Aliyi, Abdissa M; Lemu, Hirpa G.

      (2019)

      Case study on topology optimized design for additive manufacturing.

      IOP Conference Series: Materials Science and Engineering

      ISSN 1757-8981.

      Volum 659.

      Hefte 1.

      s.1-9.

      DOI: 10.1088/1757-899X/659/1/012020

    • Trzepiecinski, Thomasz; Lemu, Hirpa G.

      (2019)

      Numerical analysis of the influence of friction conditions on the pile-up effect in Vickers hardness measurements.

      IOP Conference Series: Materials Science and Engineering

      ISSN 1757-8981.

      Volum 700.

      Hefte 1.

      DOI: 10.1088/1757-899X/700/1/012019

    • Garcia-Granada, Andres; Catafal-Pedragosa, Joan; Lemu, Hirpa G.

      (2019)

      Topology optimization through stiffness/weight ratio analysis for a three-point bending test of additive manufactured parts.

      IOP Conference Series: Materials Science and Engineering

      ISSN 1757-8981.

      Volum 700.

      Hefte 1.

      DOI: 10.1088/1757-899X/700/1/012012

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

      (2019)

      Numerical simulation of FDM manufactured parts by adopting approaches in composite material simulation.

      IOP Conference Series: Materials Science and Engineering

      ISSN 1757-8981.

      Volum 700.

      Hefte 1.

      DOI: 10.1088/1757-899X/700/1/012016

    • Regassa, Yohannes; Lemu, Hirpa G.; Sirabizuh, Belete

      (2019)

      Trends of using polymer composite materials in additive manufacturing.

      IOP Conference Series: Materials Science and Engineering

      ISSN 1757-8981.

      Volum 659.

      Hefte 1.

      DOI: 10.1088/1757-899X/659/1/012021

    • Karlsen, Øyvind; Lemu, Hirpa G.

      (2019)

      Fretting fatigue and wear of mechanical joints: Literature study.

      IOP Conference Series: Materials Science and Engineering

      ISSN 1757-8981.

      Volum 700.

      Hefte 1.

      DOI: 10.1088/1757-899X/700/1/012015

    • Trzepiecinski, Thomasz; Lemu, Hirpa G.

      (2019)

      Prediction of springback in the air V-bending of metallic sheets.

      IOP Conference Series: Materials Science and Engineering

      ISSN 1757-8981.

      Volum 645.

      Hefte 1.

      DOI: 10.1088/1757-899X/645/1/012011

    • Atteya, Mostafa Ahmed; Mikkelsen, Ove; Lemu, Hirpa G.

      (2019)

      State-of-the-art of crack propagation modelling in tubular joints.

      IOP Conference Series: Materials Science and Engineering

      ISSN 1757-8981.

      Volum 700.

      Hefte 1.

      DOI: 10.1088/1757-899X/700/1/012035

    • Trzepiecinski, Thomasz; Lemu, Hirpa G.

      (2019)

      A Three-Dimensional Elastic-Plastic Contact Analysis of Vickers Indenter on a Deep Drawing Quality Steel Sheet.

      Materials

      ISSN 1996-1944.

      Volum 12.

      DOI: 10.3390/ma12132153

    • Mohammed, Abdulbasit; Lemu, Hirpa G.

      (2019)

      Wind Turbine System Modelling Using Bond Graph Method.

      Lecture Notes in Electrical Engineering

      ISSN 1876-1100.

      Volum 484.

      s.95-105.

      DOI: 10.1007/978-981-13-2375-1_14

    • Trzepiecinski, Thomasz; Lemu, Hirpa G.

      (2019)

      Finite element method-based modeling of bending under tension friction test of deep drawing quality steel sheets.

      IOP Conference Series: Materials Science and Engineering

      ISSN 1757-8981.

      Volum 504.

      Hefte 1.

      DOI: 10.1088/1757-899X/504/1/012068

    • Tolcha, Mesay Alemu; Lemu, Hirpa G.

      (2019)

      Modeling Thermomechanical Stress with H13 Tool Steel Material Response for Rolling Die under Hot Milling.

      Metals

      ISSN 2075-4701.

      Volum 9.

      Hefte 5.

      DOI: 10.3390/met9050495

    • Gebisa, Aboma Wagari; Lemu, Hirpa G.

      (2019)

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

      Procedia Manufacturing

      ISSN 2351-9789.

      Volum 30.

      s.331-338.

      DOI: 10.1016/j.promfg.2019.02.047

    • Woldemariam, Endashaw Tesfaye; Coatanéa, Eric; Wang, G. Gary; Lemu, Hirpa G.; Wu, Di

      (2018)

      Customized dimensional analysis conceptual modelling framework for design optimization—a case study on the cross-flow micro turbine model.

      Engineering optimization (Print)

      ISSN 0305-215X.

      DOI: 10.1080/0305215X.2018.1519556

    • Nikolova, Ina D.; Lemu, Hirpa G.; Dahterova, Dimitrinka S.; Ivanov, Vanio D.

      (2018)

      A Comparative Study of Outranking Methods for Multi-Criteria Optimization of Electromechanical Modules .

      Tehnicki Vjesnik

      ISSN 1330-3651.

      Volum 25.

      Hefte 5.

      s.1330-1338.

      DOI: 10.17559/TV-20170111011555

    • Woldemariam, Endashaw Tesfaye; Lemu, Hirpa G.; Wang, Gary G.

      (2018)

      CFD-Driven Valve Shape Optimization for Performance Improvement of a Micro Cross-Flow Turbine.

      Energies

      ISSN 1996-1073.

      Volum 11.

      Hefte 1.

      s.1-18.

      DOI: 10.3390/en11010248

    • Gebisa, Aboma Wagari; Lemu, Hirpa G.

      (2018)

      Investigating Effects of Fused-Deposition Modeling (FDM) Processing Parameters on Flexural Properties of ULTEM 9085 using Designed Experiment.

      Materials

      ISSN 1996-1944.

      Volum 11.

      Hefte 4.

      DOI: 10.3390/ma11040500

    • Gebisa, Aboma Wagari; Lemu, Hirpa G.

      (2018)

      Effect of Process Parameters on Compressive Properties of ULTEM 9085 Produced by FDM Process. I: 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 978-0-7918-5201-9.

      DOI: 10.1115/IMECE2018-87523

    • Gebisa, Aboma Wagari; Lemu, Hirpa G.

      (2018)

      Additive Manufacturing for the Manufacture of Gas Turbine Engine Components: Literature Review and Future Perspectives. I: 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 978-0-7918-5112-8.

      DOI: 10.1115/GT2018-76686

    • Byberg, Kate Iren; Gebisa, Aboma Wagari; Lemu, Hirpa G.

      (2018)

      Mechanical properties of ULTEM 9085 material processed by fused deposition modeling.

      Polymer testing

      ISSN 0142-9418.

      Volum 72.

      s.335-347.

      DOI: 10.1016/j.polymertesting.2018.10.040

    • Kopperstad, Karsten Mikal; Lemu, Hirpa G.

      (2018)

      Design and Performance Study of Additive Manufactured Thrusters for Remotely Operated Underwater Vehicle. I: The Proceedings of The Twenty-eighth (2018) International OCEAN AND POLAR ENGINEERING CONFERENCE, ISOPE 2018.

      International Society of Offshore & Polar Engineers

      ISBN 978-1-880653-87-6.

    • Terefe, Tesfaye Olana; Lemu, Hirpa G.

      (2018)

      Solution Approaches to Differential Equations of Mechanical System Dynamics: A Case Study of Car Suspension System.

      Advances in Science and Technology Research Journal

      ISSN 2299-8624.

      Volum 12.

      Hefte 2.

      s.266-273.

      DOI: 10.12913/22998624/85662

    • Kajela, Delesa; Lemu, Hirpa G.

      (2018)

      Design and Modelling of a Light Duty Trencher for Local Conditions.

      Advances in Science and Technology Research Journal

      ISSN 2299-8624.

      Volum 12.

      Hefte 1.

      s.303-311.

      DOI: 10.12913/22998624/85661

    • Trzepiecinski, Thomasz; Lemu, Hirpa G.

      (2018)

      Frictional Resistances of AMS5599 Nickel-based Alloy at High Pressure Conditions.

      IOP Conference Series: Materials Science and Engineering

      ISSN 1757-8981.

      Volum 381.

      Hefte 1.

      DOI: 10.1088/1757-899X/381/1/012159

    • Lemu, Hirpa G.; Trzepieciński, Tomasz; Kubit, Andrzej; Fejkiel, Romuald

      (2017)

      FRICTION MODELING OF Al-Mg ALLOY SHEETS BASED ON MULTIPLE REGRESSION ANALYSIS AND NEURAL NETWORKS.

      Advances in Science and Technology Research Journal

      ISSN 2299-8624.

      Volum 11.

      Hefte 1.

      s.48-57.

      DOI: 10.12913/22998624/68460

    • Lemu, Hirpa G.

      (2017)

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

      Nordic Journal of STEM Education

      ISSN 2535-4574.

      Volum 1.

      Hefte 1.

      s.278-286.

      DOI: 10.5324/njsteme.v1i1.2340

    • Vestli, Herman; Lemu, Hirpa G.; Svendsen, Bjørn T.; Gabrielsen, Ole; Siriwardane , S.A. Sudath C.

      (2017)

      Case studies on structural health monitoring of offshore bottom-fixed steel structures.

      ISOPE - International Offshore and Polar Engineering Conference. Proceedings

      ISSN 1098-6189.

      s.965-972.

    • Lemu, Hirpa G.

      (2017)

      Assessment and analysis of structural health monitoring techniques for rotating machines.

      ISOPE - International Offshore and Polar Engineering Conference. Proceedings

      ISSN 1098-6189.

      s.981-988.

    • Rege, Kristen; Lemu, Hirpa G.

      (2017)

      A Review of Fatigue Crack Propagation Modelling Techniques Using FEM and XFEM.

      IOP Conference Series: Materials Science and Engineering

      ISSN 1757-8981.

      Volum 276.

      Hefte 1.

      s.1-17.

      DOI: 10.1088/1757-899X/276/1/012027

    • Berkani, Imad; Karlsen, Øyvind; Lemu, Hirpa G.

      (2017)

      Experimental and numerical study of Bondura® 6.6 PIN joints.

      IOP Conference Series: Materials Science and Engineering

      ISSN 1757-8981.

      Volum 276.

      Hefte 1.

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

    • Woldemariam, Endashaw Tesfaye; Lemu, Hirpa G.; Wang, Gary G.

      (2017)

      Geometric Parameters' Effect Characterization and Design Optimization of a Micro Scale Cross-flow Turbine for an Improved Performance.

      ISOPE - International Offshore and Polar Engineering Conference. Proceedings

      ISSN 1098-6189.

      s.569-576.

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

      (2017)

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

      The American Society of Mechanical Engineers (ASME)

      ISBN 978-0-7918-5849-3.

      DOI: 10.1115/IMECE2017-70144

    • Gebisa, Aboma Wagari; Lemu, Hirpa G.

      (2017)

      Design for manufacturing to design for Additive Manufacturing: Analysis of implications for design optimality and product sustainability.

      Procedia Manufacturing

      ISSN 2351-9789.

      Volum 13.

      s.724-731.

      DOI: 10.1016/j.promfg.2017.09.120

    • Gebisa, Aboma Wagari; Lemu, Hirpa G.

      (2017)

      A Case Study on Topology Optimized Design for Additive Manufacturing.

      IOP Conference Series: Materials Science and Engineering

      ISSN 1757-8981.

      Volum 276.

      Hefte 1.

      DOI: 10.1088/1757-899X/276/1/012026

    • Trzepieciński, Tomasz; Lemu, Hirpa G.; Fejkiel, Romuald

      (2017)

      Numerical simulation of effect of friction directionality on forming of anisotropic sheets.

      International Journal of Simulation Modelling

      ISSN 1726-4529.

      Volum 16.

      Hefte 4.

      s.590-602.

      DOI: 10.2507/IJSIMM16(4)3.392

    • Trzepiecinski, Thomasz; Lemu, Hirpa G.

      (2017)

      Effect of Activation Function and Post Synaptic Potential on Response of Artificial Neural Network to Predict Frictional Resistance of Aluminium Alloy Sheets.

      IOP Conference Series: Materials Science and Engineering

      ISSN 1757-8981.

      Volum 269.

      Hefte 1.

      s.1-6.

      DOI: 10.1088/1757-899X/269/1/012041

    • Trzepiecinski, Thomasz; Fejkiel, Romuald; Lemu, Hirpa G.

      (2017)

      Experimental Investigation of Frictional Resistances in the Drawbead Region of the Sheet Metal Forming Processes.

      IOP Conference Series: Materials Science and Engineering

      ISSN 1757-8981.

      Volum 276.

      Hefte 012042.

      DOI: 10.1088/1757-899X/269/1/012042

    • Trzepiecinski, Thomasz; Lemu, Hirpa G.

      (2017)

      Prediction of springback in V-die air bending process by using finite element method.

      MATEC Web of Conferences

      ISSN 2261-236X.

      Volum 121.

      DOI: 10.1051/matecconf/201712103023

    • Trzepiecinski, Thomasz; Lemu, Hirpa G.

      (2017)

      Effect of Computational Parameters on Springback Prediction by Numerical Simulation.

      Metals

      ISSN 2075-4701.

      Volum 7.

      Hefte 9.

      DOI: 10.3390/met7090380

    • Banos, Rodrigo L.; Lemu, Hirpa G.

      (2016)

      Design and performance analysis of anchor system for a single-body wave energy converter. I: 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 978-0-7918-4997-2.

      DOI: 10.1115/omae2016-54043

    • Radostina, Petrova; Lemu, Hirpa G.

      (2016)

      Adaptability of surgical robot to guide its clamp operation along predefined path. I: Advanced Manufacturing and Automation V.

      WIT Press

      ISBN 978-1-78466-169-4.

      s.126-133.

    • Aeran, Ashish; Lemu, Hirpa G.

      (2016)

      Time Integration Schemes in Dynamic Problems: Effect of Damping on Numerical Stability and Accuracy. I: Advanced Manufacturing and Automation VI.

      Atlantis Press

      ISBN 978-94-6252-243-5.

      DOI: 10.2991/iwama-16.2016.40

    • Taboada, Jose V.; Lemu, Hirpa G.

      (2016)

      Analysis of Wave Energy Sources in the North Atlantic Waters in View of Design Challenges. I: 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 978-0-7918-4997-2.

      DOI: 10.1115/omae2016-54042

    • Woldemariam, Endashaw Tesfaye; Lemu, Hirpa G.

      (2016)

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

      Atlantis Press

      ISBN 978-94-6252-243-5.

      DOI: 10.2991/iwama-16.2016.26

    • Safari, Amir; Hajikolaei, Kambiz Haji; Lemu, Hirpa G.; Wang, Gary G.

      (2016)

      A High-Dimensional Model Representation Guided PSO Methodology with Application on Compressor Airfoil Shape Optimization. I: ASME Turbo Expo 2016: Turbomachinery Technical Conference and Exposition.

      The American Society of Mechanical Engineers (ASME)

      ISBN 978-0-7918-4975-0.

    • Trzepieciński, Tomasz; TRYTEK, Andrzej; Lemu, Hirpa G.

      (2016)

      Study of Frictional Properties of AMS Nickel-Chromium Alloys.

      Key Engineering Materials

      ISSN 1013-9826.

      Volum 674.

      s.244-249.

      DOI: 10.4028/www.scientific.net/KEM.674.244

    • Nikolova, Ina D.; Dahterova, Dimitrinka S.; Ivanov, Dimitrinka S.; Lemu, Hirpa G.

      (2016)

      Multi-criteria Optimization of Electromechanical Modules: Part 2 - RAZOR method. I: Advanced Manufacturing and Automation VI.

      Atlantis Press

      ISBN 978-94-6252-243-5.

      DOI: 10.2991/iwama-16.2016.28

    • ؝ygarden, Benjamin; Bruset, Mathias; Lemu, Hirpa G.

      (2016)

      Multibody Dynamics Simulation of ROV Manipulator Designed for Student Competition. I: Advanced Manufacturing and Automation VI.

      Atlantis Press

      ISBN 978-94-6252-243-5.

      DOI: 10.2991/iwama-16.2016.42

    • Lemu, Hirpa G.

      (2016)

      Beyond Rapid Prototyping: Study of prospects and impacts of 3D printing in functional part fabrication . I: Advanced Manufacturing and Automation VI.

      Atlantis Press

      ISBN 978-94-6252-243-5.

      DOI: 10.2991/iwama-16.2016.25

    • Woldemariam, Endashaw Tesfaye; Lemu, Hirpa G.

      (2016)

      Nonlinear isogeometric analysis in simulation-based design optimization: State-of-the-art analysis. I: Advanced Manufacturing and Automation V.

      WIT Press

      ISBN 978-1-78466-169-4.

      s.89-97.

      DOI: 10.2495/IWAMA150111

    • Lemu, Hirpa G.

      (2016)

      Proposal for design-centered cloud computing in engineering design and manufacturing. I: Advanced Manufacturing and Automation V.

      WIT Press

      ISBN 978-1-78466-169-4.

      s.241-249.

      DOI: 10.2495/IWAMA150281

    • Nikolova, Ina D.; Dahterova, Dimitrinka S.; Ivanov, Vanio D.; Lemu, Hirpa G.

      (2016)

      Multi-criteria Optimization of Electromechanical Modules: Part 1- PROMETHEE method. I: Advanced Manufacturing and Automation VI.

      Atlantis Press

      ISBN 978-94-6252-243-5.

      DOI: 10.2991/iwama-16.2016.23

    • Trzepieciński, Tomasz; Bazan, Anna; Lemu, Hirpa G.

      (2015)

      Study of Frictional Characteristics of Steel Sheets Used in Automobile Industry.

      International Journal of Automotive Technology

      ISSN 1229-9138.

      Volum 16.

      Hefte 5.

      s.849-863.

      DOI: 10.1007/s12239-015-0087-1

    • Safari, Amir; Adel, Younis; Wang, Gary G.; Lemu, Hirpa G.; Zuomin, Dong

      (2015)

      Development of a metamodel assisted sampling approach to aerodynamic shape optimization problems.

      Journal of Mechanical Science and Technology

      ISSN 1738-494X.

      Volum 29.

      Hefte 5.

      s.2013-2024.

      DOI: 10.1007/s12206-015-0422-5

    • Trzepieciński, Tomasz; Lemu, Hirpa G.

      (2015)

      Proposal of Experimental-Numerical Method for Friction Description in Sheet Metal Forming.

      Strojniski vestnik

      ISSN 0039-2480.

      Volum 61.

      Hefte 6.

      s.383-391.

      DOI: 10.5545/sv-jme.2015.2404

    • Lemu, Hirpa G.

      (2015)

      Advances in numerical computation based mechanical system design and simulation.

      Advances in Manufacturing

      ISSN 2095-3127.

      Volum 3.

      Hefte 2.

      s.130-138.

      DOI: 10.1007/s40436-015-0110-9

    • Trzepieciński, Tomasz; BAZAN, anna; Lemu, Hirpa G.

      (2015)

      Finite Element Modeling of Frictional and Material Anisotropy during Forming of Steel Cylindrical Cups.

      Applied Mechanics and Materials

      ISSN 1660-9336.

      Volum 789-790.

      s.3-6.

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

    • Lemu, Hirpa G.; Radostina, Petrova; Mihailov, Assen

      (2015)

      Study of a Vertical Axis Wind Turbine Using Fluid Particle Trajectory.

      Applied Mechanics and Materials

      ISSN 1660-9336.

      Volum 799-800.

      s.618-624.

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

    • Trzepieciński, Tomasz; Lemu, Hirpa G.

      (2014)

      Frictional conditions of AA5251 aluminium alloy sheets using drawbead simulator tests and numerical methods.

      Strojniski vestnik

      ISSN 0039-2480.

      Volum 60.

      Hefte 1.

      s.51-60.

      DOI: 10.5545/sv-jme.2013.1310

    • Lemu, Hirpa G.

      (2014)

      Virtual engineering in design and manufacturing.

      Advances in Manufacturing

      ISSN 2095-3127.

      Volum 2.

      Hefte 4.

      s.289-294.

      DOI: 10.1007/s40436-014-0085-y

    • Lemu, Hirpa G.

      (2014)

      Current status and challenges of using geometric tolerance information in intelligent manufacturing systems.

      Advances in Manufacturing

      ISSN 2095-3127.

      Volum 2.

      Hefte 1.

      s.13-21.

      DOI: 10.1007/s40436-014-0056-3

    • Lemu, Hirpa G.; Trzepieciński, Tomasz

      (2014)

      Multiple Regression and Neural Network Based Characterization of Friction in Sheet Metal Forming.

      Advanced Materials Research

      ISSN 1022-6680.

      Volum 1051.

      s.204-210.

      DOI: 10.4028/www.scientific.net/AMR.1051.204

    • Lemu, Hirpa G.

      (2014)

      Simulation-based engineering approaches for renewable energy conversion systems.

      Advanced Materials Research

      ISSN 1022-6680.

      Volum 1039.

      s.91-98.

      DOI: 10.4028/www.scientific.net/AMR.1039.91

    • Huluka, Alemayehu W.; Lemu, Hirpa G.

      (2014)

      Study and Development of Vehicle Collision Detection System. I: 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 978-13-7918-4652.

      DOI: 10.1115/IMECE2014-37227

    • Petrova, Radostina; Lemu, Hirpa G.

      (2014)

      Stress and Displacement Analysis of a HAWT Under Time-Variable Wind. I: 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 978-13-7918-4652.

      DOI: 10.1115/IMECE2014-37018

    • Lemu, Hirpa G.

      (2014)

      Virtual Engineering Based Design Integration, Visualization and Validation.

      Journal of Applied Mechanical Engineering

      ISSN 2168-9873.

      Volum 3.

      Hefte 2.

      DOI: 10.4172/2168-9873.1000e129

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

      (2014)

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

      American Institute of Aeronautics and Astronautics (AIAA)

      ISBN 978-1-62410-310-0.

      DOI: 10.2514/6.2014-1486

    • Larion, Ioan; Lemu, Hirpa G.

      (2014)

      Study of Coanda Effect Applied to Vertical Wind Turbine Blades. I: 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 978-13-7918-4652.

      DOI: 10.1115/IMECE2014-39864

    • Lemu, Hirpa G.

      (2013)

      Assessment of geometric tolerance information as a carrier of design intent to manufacturing and inspection. I: Proceedings of IWAMA 2013 - The Third International Workshop of Advanced Manufacturing and Automation.

      Tapir Akademisk Forlag

      ISBN 978-82-321-0377-5.

      s.59-70.

    • Lemu, Hirpa G.

      (2013)

      Study of the role of virtual engineering technologies in design. I: Proceedings of IWAMA 2013 - The Third International Workshop of Advanced Manufacturing and Automation.

      Tapir Akademisk Forlag

      ISBN 978-82-321-0377-5.

      s.148-155.

    • Safari, Amir; Lemu, Hirpa G.; Assadi, Mohsen

      (2013)

      A Novel Combination of Adaptive Tools for Turbomachinery Airfoil Shape Optimization Using a Real-coded Genetic Algorithm. I: ASME Turbo Expo: Turbine Technical Conference and Exposition 2013, USA.

      The American Society of Mechanical Engineers (ASME)

      ISBN 978-0-7918-5523-2.

      DOI: 10.1115/GT2013-94093

    • Safari, Amir; Lemu, Hirpa G.; Jafari, Soheil; Assadi, Mohsen

      (2013)

      A Comparative Analysis of Nature-Inspired Optimization Approaches to 2D Geometric Modelling for Turbomachinery Applications.

      Mathematical problems in engineering

      ISSN 1024-123X.

      s.1-15.

      DOI: 10.1155/2013/716237

    • Lemu, Hirpa G.; Trzepieciński, Tomasz

      (2013)

      Numerical and Experimental Study of Frictional Behavior in Bending Under Tension Test.

      Strojniski vestnik

      ISSN 0039-2480.

      Volum 59.

      Hefte 1.

      s.41-49.

      DOI: 10.5545/sv-jme.2012.383

    • Lemu, Hirpa G.

      (2013)

      On Hybrid Computer-Aided Tools to Interface Design Data.

      Journal of Mechanics Engineering and Automation

      ISSN 2159-5275.

      Volum 3.

      Hefte 7.

      s.397-404.

    • Omran, Mojtaba P.; Amani, Amin; Lemu, Hirpa G.

      (2013)

      Analytical Approximation of Nonlinear Vibration of String with Large Amplitudes.

      Journal of Mechanical Science and Technology

      ISSN 1738-494X.

      Volum 27.

      Hefte 4.

      s.981-986.

      DOI: 10.1007/s12206-013-0301-x

    • Trzepiecinski, Thomasz; Lemu, Hirpa G.

      (2012)

      Study of Material Anisotropy in Metal Forming Using Finite Element Methods. I: Anisotropy Research: New Developments.

      Nova Science Publishers, Inc.

      ISBN 978-1-62081-977-7.

      s.1-24.

      DOI: 10.1007/s12289-010-0994-7

    • Trzepieciński, Tomasz; Lemu, Hirpa G.

      (2012)

      Application of Genetic Algorithms to Optimize Neural Networks for Selected Tribological Tests.

      Journal of Mechanics Engineering and Automation

      ISSN 2159-5275.

      Volum 2.

      Hefte 2.

      s.69-76.

    • Petrova, Radostina; Lemu, Hirpa G.

      (2012)

      Design study for dynamic behavior of wind turbine blade. I: Proceedings of IWAMA 2012 - The Second International Workshop of Advanced Manufacturing and Automation.

      Tapir Akademisk Forlag

      ISBN 978-82-321-0110-8.

      s.131-138.

    • Safari, Amir; Lemu, Hirpa G.

      (2012)

      Optimum nurbs curve fitting for geometry parameterization of gas turbine blade's sections ; part 1: evolutionary optimization techniques. I: International mechanical engineering congress and exposition.

      The American Society of Mechanical Engineers (ASME)

      ISBN 9780791845172.

    • Safari, Amir; Lemu, Hirpa G.

      (2012)

      A comparative study of optimum bezier and NURBS curve fitting for measured point cloud of airfoil shapes. I: Proceedings of IWAMA 2012 - The Second International Workshop of Advanced Manufacturing and Automation.

      Tapir Akademisk Forlag

      ISBN 978-82-321-0110-8.

      s.421-428.

    • Lemu, Hirpa G.; Kurtovic, Safet

      (2012)

      3D Printing for rapid manufacturing : study of dimensional and geometrical accuracy. I: Advances in Production Management Systems. Value Networks: Innovation, Technologies, and Management.

      Springer Science+Business Media B.V.

      ISBN 978-3-642-33979-0.

      s.470-479.

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

    • Lemu, Hirpa G.; Trzepieciński, Tomasz

      (2012)

      Study of Material Modeling Strategies for Deformability Analysis of Rectangular Cups.

      Advanced Materials Research

      ISSN 1022-6680.

      Volum 498.

      s.243-248.

      DOI: 10.4028/www.scientific.net/AMR.498.243

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

      (2012)

      Study on need assessment of mechatronics education in Norway and Poland. I: Advances in Production Management Systems. Value Networks: Innovation, Technologies, and Management.

      Springer Science+Business Media B.V.

      ISBN 978-3-642-33979-0.

      s.557-566.

      DOI: 10.1007/978-3-642-33980-6_60

    • Safari, Amir; Lemu, Hirpa G.

      (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.

      The American Society of Mechanical Engineers (ASME)

      ISBN 9780791845172.

    • Lemu, Hirpa G.; Trzepiecinski, Thomasz

      (2012)

      FEM Based Deformability Analysis of Metal Forming: Influence of Material Models and Analysis Approaches.

      AIP Conference Proceedings

      ISSN 0094-243X.

      Volum 1431.

      s.702-710.

      DOI: 10.1063/1.4707626

    • Lemu, Hirpa G.

      (2011)

      Influence of Interference Fit and Surface Roughness on Contact Resistance of Tubing Connections.

      Journal of Mechanics Engineering and Automation

      ISSN 2159-5275.

      Volum 1.

      Hefte 4.

      s.285-292.

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

      (2011)

      Study on Need Assessment of Mechatronics Education in Norway and Poland. I: Advances in production management systems : value networks : innovatio n,technologies and management.

      ISBN 978-82-7644-461-2.

    • Gelgele, Hirpa Lemu; Trzepiecinski, Thomasz

      (2011)

      Investigation of Anisotropy Problems in Sheet Metal Forming using Finite Element Method.

      International Journal of Material Forming

      ISSN 1960-6206.

      Volum 4.

      Hefte 4.

      s.357-369.

      DOI: 10.1007/s12289-010-0994-7

    • Safari, Amir; Saeidi, Hossein; Gelgele, Hirpa Lemu

      (2011)

      Assessment of gas turbine compressor fouling effects on operation cost and performance of thermal power plants in Iran. I: Proceedings of the 24th International Congress on Condition Monitoring and Diagnostics Engineering Management (COMADEM2011).

      COMADEM International

      ISBN 0-9541307-2-3.

      s.906-914.

    • Gelgele, Hirpa Lemu; Foggi, Jiregna Hirko

      (2010)

      Finite Element Based Stress Prediction for Design of Composite Materials. I: International Workshop of Advanced Manufacturing and Automation : (IWAMA2010) : 25-27th September, 2010, Shanghai University, Shanghai, China.

      Tapir Akademisk Forlag

      ISBN 978-82-519-2518-1.

      s.149-156.

    • Gelgele, Hirpa Lemu

      (2010)

      Study of Design Optimization Using Finite Element Method and Genetic Algorithm. I: International Workshop of Advanced Manufacturing and Automation : (IWAMA2010) : 25-27th September, 2010, Shanghai University, Shanghai, China.

      Tapir Akademisk Forlag

      ISBN 978-82-519-2518-1.

      s.127-134.

    • Gelgele, Hirpa Lemu; Foggi, Jiregna Hirko

      (2010)

      Finite element based stress prediction for design of composite materials. I: International Workshop of Advanced Manufacturing and Automation : (IWAMA2010) : 25-27th September, 2010, Shanghai University, Shanghai, China.

      Tapir Akademisk Forlag

      ISBN 978-82-519-2518-1.

      s.149-156.

    • Gelgele, Hirpa Lemu

      (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
    • Lemu, Hirpa G.

      (2012)

      Anisotropy Research: New Developments.

      Nova Science Publishers, Inc.

      ISBN 978-1-62081-977-7.

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

      (2021)

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

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

      (2021)

      Overview study on challenges of additive manufacturing for a healthcare application.

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

      (2021)

      Characterization of acoustic emission signals under 3-point bending test.

    • Karlsen, Øyvind; Lemu, Hirpa G.

      (2021)

      Safety related study of Expanding Pin systems application in lifting and drilling equipment within Construction, Offshore, and Marine sectors.

    • Regassa, Yohannes; Lemu, Hirpa G.; Sirhabizu, Belete

      (2021)

      Burst strength analysis of composite overwrapped pressure vessel using finite element method.

    • Jiregna, Iyasu T; Lemu, Hirpa G.

      (2021)

      Thermal stress analysis of disc brake using analytical and numerical methods.

    • Tura, Amanuel; Mamo, Hanna; Jelila, Yohannis; Lemu, Hirpa G.

      (2021)

      Experimental investigation and ANN prediction for part quality improvement of fused deposition modeling parts.

    • Villoria, Bruno; Siriwardane , Sudath C.; Lemu, Hirpa G.

      (2021)

      Review on fatigue life assessment methods for welded joints in orthotropic steel decks of long-span bridges.

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

      (2021)

      Study of rail-wheel contact problem by analytical and numerical approaches.

    • Ambaye, Getachew A.; Lemu, Hirpa Gelgele

      (2020)

      Dynamic analysis of spur gear with backlash using ADAMS.

    • Mohammed, Abdulbasit; Lemu, Hirpa Gelgele; Sirabizuh, Belete

      (2020)

      Statistical Analysis of Ethiopian Wind Power Potential at Selected Sites.

    • Dawit, Jonathan B.; Lemu, Hirpa Gelgele; Regassa, Yohannes; Akessa, Adugna Deressa

      (2020)

      Investigation of the mechanical properties of Acacia tortilis fiber reinforced natural composite.

    • Ambaye, Getachew A.; Lemu, Hirpa Gelgele

      (2020)

      Effect of backlash on transmission error and time varying mesh stiffness.

    • Jelila, Yohanis D.; Lemu, Hirpa Gelgele

      (2020)

      Study of wheel-rail contacts at railway turnout using multibody dynamics simulation approach.

    • Regassa, Yohannes; Lemu, Hirpa Gelgele; Sirabizuh, Belete

      (2020)

      Nature Inspired Design in Fiber Orientation Trends for Reinforcement of Composites.

    • Tilahun, Nigatu D.; Lemu, Hirpa Gelgele

      (2020)

      Mechanical Vibration Analysis of Fiber Reinforced Polymer Composite Beams Using Analytical and Numerical Methods.

    • Lemu, Hirpa Gelgele

      (2020)

      Application of High-dimensional and Nature Inspired Approaches to Design Optimization of Energy Converters.

    • Batu, Temesgen; Lemu, Hirpa Gelgele

      (2020)

      Fatigue life study of false banana/glass fiber reinforced composite for wind turbine blade application.

    • Lemu, Hirpa Gelgele

      (2020)

      Advances, opportunities and limitations of Additive Manufacturing Technology.

    • Alemayehu, Samrawit; Regassa, Yohannes; Yoseph, Bisrath; Lemu, Hirpa Gelgele

      (2020)

      Mechanical Properties Characterization of Water Hyacinth (“Emboch”) Plant for Use as Fiber Reinforced Polymer Composite.

    • Aliyi, Abdulbasit M; Lemu, Hirpa G.

      (2019)

      Case study on topology optimized design for additive manufacturing.

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

      (2019)

      Numerical simulation of FDM manufactured parts by adopting approaches in composite material simulation.

    • Regassa, Yohannes; Lemu, Hirpa G.; Sirabizuh, Belete

      (2019)

      Trends of using polymer composite materials in additive manufacturing.

    • Karlsen, Øyvind; Lemu, Hirpa G.

      (2019)

      Fretting fatigue and wear of mechanical joints: Literature study.

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

      (2019)

      Review and synthesis of a walking machine (Robot) leg mechanism.

    • Karlsen, Øyvind; Lemu, Hirpa G.

      (2019)

      On modelling techniques for Mechanical joints: Literature study.

    • Batu, Temesgen; Lemu, Hirpa G.

      (2019)

      Comparative study of the effect of chord length computation methods in design of wind turbine blade.

    • Marek, Kowalik; Trzepiecinski, Thomasz; Lemu, Hirpa G.

      (2019)

      Effect of Pressing Parameters on the Quality of Joint Formation of Heat Exchanger Fins with the Base Plate.

    • Atteya, Mostafa Ahmed; Mikkelsen, Ove; Lemu, Hirpa G.

      (2019)

      State-of-the-art of crack propagation modelling in tubular joints.

    • Woldemariam, Endashaw Tesfaye; Lemu, Hirpa G.

      (2019)

      A machine Learning based framework for model approximation followed by design Optimization for expensive numerical simulation-based Optimization problems.

    • Gebisa, Aboma Wagari; Lemu, Hirpa G.

      (2018)

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

    • Regassa, Yohannes; Sirabizuh, Belete; Lemu, Hirpa G.

      (2018)

      Review and Analysis of Processing Principles and Applications of Self-healing Composite Materials.

    • Regassa, Yohannes; Lemu, Hirpa G.

      (2018)

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

    • Lemu, Hirpa G.

      (2018)

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

    • Trzepiecinski, Thomasz; Lemu, Hirpa G.

      (2018)

      FEM-based assessment of wear of stamping die.

    • Lemu, Hirpa G.

      (2018)

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

    • Kopperstad, Karsten Mikal; Lemu, Hirpa G.

      (2018)

      Design and Performance Study of Additive Manufactured Thrusters for Remotely Operated Underwater Vehicle.

    • Gebisa, Aboma Wagari; Lemu, Hirpa G.

      (2018)

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

    • Mohammed, Abdulbasit; Lemu, Hirpa G.

      (2018)

      Modelling Wind Turbine System Using Bond Graph Method.

    • Trzepiecinski, Thomasz; Fejkiel, Romuald; Lemu, Hirpa G.

      (2017)

      Experimental Investigation of Frictional Resistances in the Drawbead Region of the Sheet Metal Forming Processes.

    • Vestli, Herman; Lemu, Hirpa G.; Svendsen, Bjørn T.; Gabrielsen, Ole; Siriwardane , S.A. Sudath C.

      (2017)

      Case Studies on Structural Health Monitoring of Offshore Bottom-fixed Steel Structures.

    • Lemu, Hirpa G.

      (2017)

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

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

      (2017)

      Mechanical Property Characterization of Additive Manufactured ABS Material Using Design of Experiment Approach.

    • Rege, Kristen; Lemu, Hirpa G.

      (2017)

      A review of fatigue crack propagation modelling techniques using FEM and XFEM.

    • Lemu, Hirpa G.

      (2017)

      Assessment and Analysis of Structural Health Monitoring Techniques for Rotating Machines.

    • Olsen, Erik Vasøy; Lemu, Hirpa G.

      (2016)

      Mechanical testing of composite materials for monocoque design in Formula Student car.

      International Journal of Social, Behavioral, Educational, Economic, Business and Industrial Engineering

      ISSN 2010-376X.

      Volum 10.

      Hefte 1.

      s.1-8.

    • Safari, Amir; Hajikolaei, Kambiz Haji; Lemu, Hirpa G.; Wang, Gary G.

      (2016)

      A High-Dimensional Model Representation Guided PSO Methodology with Application on Compressor Airfoil Shape Optimization.

    • Taboada, Jose V.; Lemu, Hirpa G.

      (2016)

      Analysis of Wave Energy Sources in the North Atlantic Waters in View of Design Challenges.

    • Woldemariam, Endashaw Tesfaye; Lemu, Hirpa G.

      (2016)

      Comparative analysis of computational methods in Fluid-Structure Interaction: Temporal descretization and coupling techniques.

    • Radostina, Petrova; Assen, Mihailov; Lemu, Hirpa G.

      (2015)

      Study of a Vertical Axis Wind Turbine Using Fluid Particle Trajectory.

    • Trzepieciński, Tomasz; Lemu, Hirpa G.

      (2015)

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

    • Radostina, Petrova; Lemu, Hirpa G.

      (2015)

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

    • Lemu, Hirpa G.

      (2015)

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

    • Woldemariam, Endashaw Tesfaye; Lemu, Hirpa G.

      (2015)

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

    • Taboada, Jose V.; Lemu, Hirpa G.; Perez, Jose A.

      (2014)

      Comparative analysis of two offshore wave energy conversion devices: Cape Verde vs. Flexible Drive Line designs.

    • Radostina, Petrova; Lemu, Hirpa G.

      (2014)

      Stress and displacement analysis of a HAWT under time-variable wind.

    • Ioan, Larion; Lemu, Hirpa G.

      (2014)

      Study of Coanda effect applied to vertical Wind turbine blades.

    • Alemayehu W., Huluka; Lemu, Hirpa G.

      (2014)

      Study and development of vehicle collision detection system.

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

      (2014)

      Surrogate-assisted Self-accelerated Particle Swarm Optimization.

    • Younis, Adel; Safari, Amir; Wang, G. Gary; Lemu, Hirpa G.; Dong, Zuomin

      (2013)

      SHAPE OPTIMIZATION OF TYPICAL HEAVY-DUTY GAS TURBINE COMPRESSOR AIROFOIL USING METAMODEL BASED ALGORITHM.

    • Safari, Amir; Hajikolaei, Kambiz H.; Lemu, Hirpa G.; Wang, Gary G.; Assadi, Mohsen

      (2013)

      Decomposition of High-Dimensional Shape Optimization Problems Through Quantifying Design Variable Correlation.

    • Safari, Amir; Lemu, Hirpa G.; Mohsen, Assadi

      (2013)

      A Novel Combination of Adaptive Tools for Turbomachinery Airfoil Shape Optimization Using a Real-coded Genetic Algorithm.

    • Lemu, Hirpa G.

      (2013)

      Multibody dynamics simulation in design and performance analysis of energy conversion systems – a review.

    • Safari, Amir; Lemu, Hirpa G.

      (2012)

      Optimum nurbs curve fitting for geometry parameterization of gas turbine blade’s sections ; part 2: swarm intelligence techniques.

    • Safari, Amir; Lemu, Hirpa G.

      (2012)

      Review of Recent Researches on Gas Turbine Blades Shape Optimization Techniques and Approaches.

    • Safari, Amir; Lemu, Hirpa G.; Severson, Henning

      (2012)

      Geometric Modeling and Numerical Simulation of Airfoil Shapes Using Integrated MATLAB® and COMSOL Multiphysics®.

    • Safari, Amir; Lemu, Hirpa G.

      (2012)

      Optimum NURBS curve fitting for geometry parameterization of gas turbine blades’ sections: Part I – Evolutionary optimization techniques.

    • Lemu, Hirpa G.

      (2011)

      Transmission System Design and 2D/3D Finite Element Analysis.

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

      (2011)

      Analysis of Companies' Needs Related to the Mechatronics Study Graduates.

    • Lemu, Hirpa G.

      (2011)

      Tolerances in Design and Strain Beyond Elastic Limit.

    • Said, Hossein; Safari, Amir; Lemu, Hirpa G.

      (2011)

      A Quantitative Prediction of Axial Compressor Performance Deterioration Using Fouling Full 3D Modeling.

    • Lemu, Hirpa G.; Trzepieciński, Tomasz

      (2011)

      FEM Based Deformability Analysis of Metal Forming: influence of material models and analysis approaches.

    • Gelgele, Hirpa Lemu

      (2010)

      Rapid Prototyping - A manufacturing Tool for Orthopedics Devices.

    • Gelgele, Hirpa Lemu

      (2010)

      Experimental study and Finite Element Analysis of Expandable Tubulars.

    • Gelgele, Hirpa Lemu

      (2010)

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

    • Gelgele, Hirpa Lemu

      (2010)

      Finite Element Methods in Strength Analysis of Orthopedics Devices.

    • Gelgele, Hirpa Lemu

      (2009)

      Design and Analysis of Machines and Mechanisms.

    • Gelgele, Hirpa Lemu

      (2009)

      Study of Contact Area and Contact Resistance in Contact Design of Tubing Connections.

    • Gelgele, Hirpa Lemu

      (2008)

      Dimensjonering av maskinelementer.

    • Gelgele, Hirpa Lemu

      (2008)

      Introductory Tutorials in Using ANSYS 11 and MATLAB.

    • Gelgele, Hirpa Lemu

      (2007)

      Preliminary Study of Tubular Expansion Using Finite Element Methods.

    • Gelgele, Hirpa Lemu

      (2006)

      Finite Element Based Genetic Algorithm for Structural Design Optimization.

    • Gelgele, Hirpa Lemu

      (2006)

      Challenges of Knowledge Discovery and Management.

    • Gelgele, Hirpa Lemu

      (2005)

      Stress Concentration Analysis in Pressure Vessels Using Finite Element Method.

    • Gelgele, Hirpa Lemu

      (2004)

      The TSP Scenario for Optimized Sequencing of Machining Operations.

    • Gelgele, Hirpa Lemu

      (2003)

      Solving Manufacturing System Problems Using Hybrid Genetic Algorithm and Artificial Neural Networks.

    • Gelgele, Hirpa Lemu; Wang, Kesheng

      (2002)

      Modelling and Optimation of Machining Process Using Hybrid Computational Intelligence Approach.

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