Blar i Vitenskapelige publikasjoner (TN-IMBM) på forfatter "Lemu, Hirpa Gelgele"
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Analysis of Thermomechanical Cracks of Disc Brake Used in Heavy Trucks
Bena, Welteji; Lemu, Hirpa Gelgele (Peer reviewed; Journal article, 2022)In the present work, the study of fatigue failure of the disc brake of Volvo truck under thermomechanical effects across the disc thickness is reported. Both analytical and numerical approaches have been used. In the ... -
A case study on use of 3D scanning for reverse engineering and quality control
Lemu, Hirpa Gelgele; Helle, Robin H. (Peer reviewed; Journal article, 2021-03)Reverse engineering is needed to acquire knowledge of design that is lost, obsolete or withheld. Techniques have evolved from manual measurements, to utilizing the possibilities that lie within 3D scanning technologies. ... -
Comparative study on loosening of anti-loosening bolt and standard bolt system
Karlsen, Øyvind; Lemu, Hirpa Gelgele (Peer reviewed; Journal article, 2022)In general, bolted connections are exposed to vibrations or repeated over-loads that could lead to self-loosening due to loss of preload. Pre-tensioned bolts in ring flanges are critical parts in Offshore Floating Wind ... -
Composite Overwrapped Pressure Vessel Design Optimization Using Numerical Method
Regassa, Yohannes; Gari, Jema; Lemu, Hirpa Gelgele (Journal article; Peer reviewed, 2022-08-05)Composite Overwrapped Pressure Vessels (COPVs) are widely used in fields including aeronautics and by companies such as SpaceX to hold high pressure fluids. They are favored for these applications because they are far ... -
Contact temperature analysis of the classical Geneva mechanism through numerical methods
Ambaye, Getachew A.; Lemu, Hirpa Gelgele; Tolcha, Mesay A. (Peer reviewed; Journal article, 2022)In this study, the flash temperature of the classical Geneva mechanism has been studied using the numer- ical method. An excessive sliding motion between the wheel and pin leads to the generation of heat at the contact ... -
Current Concepts for Cutting Metal-Based and Polymer-Based Composite Materials
Trzepieciński, Tomasz; Najm, Sherwan Mohammed; Lemu, Hirpa Gelgele (Peer reviewed; Journal article, 2022)Due to the variety of properties of the composites produced, determining the choice of the appropriate cutting technique is demanding. Therefore, it is necessary to know the problems associated with cutting operations, ... -
Determining Optimum Rotary Blade Design for Wind-Powered Water-Pumping Systems for Local Selected Sites
Mohammed, Abdulbasit; Lemu, Hirpa Gelgele; Sirahbizu, Belete (Peer reviewed; Journal article, 2021)The design of a windmill rotor is critical for harnessing wind energy. In this work, a study is conducted to optimize the design and performance of a rotor blade that is suitable for low wind conditions. The windmills’ ... -
Dynamic analysis of spur gear with backlash using ADAMS
Ambaye, Getachew A.; Lemu, Hirpa Gelgele (Peer reviewed; Journal article, 2020)Gear tooth profile can deviate from its initial design shape and size as a result of increasing service time under time-varying load, introducing external agents like debris, overheating due to friction, wear, and in ... -
Experience in Use of 3D Printing in Engineering Education at University of Stavanger
Lemu, Hirpa Gelgele; Mikkelsen, Ove (Peer reviewed; Journal article, 2021)This article is based on a project run in 2018 and 2019 entitled “Educating Mechanical Engineering using 3D Printing – Under3DP”. The project was funded by Faculty of Science and Technology, University of Stavanger (UiS). ... -
Experimental Investigation and Prediction of Mechanical Properties in a Fused Deposition Modeling Process
Tura, Amanuel; Lemu, Hirpa Gelgele; Mamo, Hanna (Journal article; Peer reviewed, 2022-06-15)Additive manufacturing, also known as three-dimensional printing, is a computer-controlled advanced manufacturing process that produces three-dimensional items by depositing materials directly from a computer-aided design ... -
Experimental Investigation of Al-CuMgMn Alloy Developed by Laser Beam Surface Modification for Wear Resistance
Tolcha, Mesay A.; Jiru, Moera G.; Lemu, Hirpa Gelgele (Peer reviewed; Journal article, 2021-04)Laser surface alloying is one of the recent technologies used in the manufacturing sector for improving the surface properties of metals. Aluminum alloys are key materials in the manufacturing sector. This favors their ... -
Exploration of Mechanical Properties of Enset–Sisal Hybrid Polymer Composite
Bekele, Abera E.; Lemu, Hirpa Gelgele; Jiru, Moera G. (Peer reviewed; Journal article, 2022-02)Enset and sisal fibers are among the most widely used reinforcement to fabricate natural fiber-based composite materials. Hand lay-up techniques were employed in this study to fabricate enset–sisal (E/S) hybrid fiber ... -
Internal Corrosion Damage Mechanisms of the Underground Water Pipelines
Yeshanew, Desalegn A.; Jiru, Moera G.; Lemu, Hirpa Gelgele; Tolcha, Mesay A. (Peer reviewed; Journal article, 2022)Internal water pipe corrosion is a complicated problem due to the interaction of water quality parameters with pipe wall. This study presents investigations of internal pipe surface corrosion mechanisms related to water ... -
Investigation of mechanical properties of false banana/glass fiber reinforced hybrid composite materials
Batu, Temesgen; Lemu, Hirpa Gelgele (Peer reviewed; Journal article, 2020)The objective of the work presented in this article is to investigate the mechanical properties of false banana/glass fiber reinforced hybrid composite materials at different fiber volume fractions and orientation of hybrid ... -
Investigation of the mechanical properties of Acacia tortilis fiber reinforced natural composite
Dawit, Jonathan B.; Lemu, Hirpa Gelgele; Regassa, Yohannes; Akessa, Adugna Deressa (Peer reviewed; Journal article, 2020-10)The work presented in this paper is motivated by the fact that use of natural fiber materials for structural and non-structural applications have increased within the last two decades. In addition to the known benefits of ... -
Investigations of Microstructure and Mechanical Properties of 17-4 Ph Ss Printed by Markforged Metal X
Akessa, Adugna Deressa; Tucho, Wakshum Mekonnen; Lemu, Hirpa Gelgele; Grønsund, Jørgen (Peer reviewed; Journal article, 2022-10)The Markforged Metal X (MfMX) printing machine (Markforged Inc., Massachusetts, USA) is one of the latest introduced additive manufacturing (AM) devices. It is getting popular because of its safety, simplicity, and ability ... -
Minimization of Surface Roughness and Temperature during Turning of Aluminum 6061 Using Response Surface Methodology and Desirability Function Analysis
Gutema, Endalkachew Mosisa; Gopal, Mahesh; Lemu, Hirpa Gelgele (Peer reviewed; Journal article, 2022)Aluminum alloy is the second most abundant metal on Earth, known for its wide range of utilization in commercial goods due to its heat capacity and tensile strength. This study examines the effect of nose radius on the ... -
Multi objective parametric optimization and composite material performance study for master leaf spring
Batu, Temesgen; Lemu, Hirpa Gelgele; G. Michael, Elias (Peer reviewed; Journal article, 2021-03)Design optimization of product with the objective of reducing weight is one of current focuses in a product design. In the vehicle industry, in particular, weight reduction has significant impact on vehicle efficiency ... -
Optimal Rotary Wind Turbine Blade Modeling with Bond Graph Approach for Specific Local Sites
Mohammed, Abdulbasit; Sirahbizu, Belete; Lemu, Hirpa Gelgele (Peer reviewed; Journal article, 2022-09)The wind turbine blade is an important component for harnessing wind energy. It plays a vital role in wind turbine operation. In this work, a study was conducted to investigate the dynamic behavior of an optimal rotary ... -
Prediction of tensile strength in fused deposition modeling process using artificial neural network and fuzzy logic
Tura, Amanuel Diriba; Lemu, Hirpa Gelgele; Mamo, Hana Beyene; Santhosh, A. Johnson (Peer reviewed; Journal article, 2022)Fused deposition modeling is a modern rapid prototyping technique that is used for swiftly replicating concept modeling, physical modeling, and end-of-line manufacture. Precision parameter selection is crucial for generating ...