Blar i Vitenskapelige publikasjoner (TN-IMBM) på forfatter "Lemu, Hirpa G."
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Additive manufacturing best practices and its impact on supply chain performance through structural equation modelling: A case study in Ethiopian footwear industry
Lemma, Tekalign; Gutema, Endalkachew Mosisa; Lemu, Hirpa G. (Peer reviewed; Journal article, 2023)The aim of this study is to analyze the effects of additive manufacturing (AM) best practices on supply chain (SC) performance. The study developed conceptual framework with four AM best practice as independent variables ... -
Application of Artificial Intelligence for Surface Roughness Prediction of Additively Manufactured Components
Batu, Temesgen; Lemu, Hirpa G.; Shimels, Hailu (Peer reviewed; Journal article, 2023)Additive manufacturing has gained significant popularity from a manufacturing perspective due to its potential for improving production efficiency. However, ensuring consistent product quality within predetermined equipment, ... -
Application of Composite Materials for Energy Generation Devices
Trzepieciński, Tomasz; Batu, Temesgen; Kibrete, Fasikaw; Lemu, Hirpa G. (Peer reviewed; Journal article, 2023-02)Globally, electricity demand rises by 1.8% per year; according to the American Energy Information Administration, global energy demand will increase by 47% over the next 30 years, driven by demographic and economic growth. ... -
Assessment of awareness levels towards additive manufacturing best practices in transforming traditional manufacturing: A case study in Ethiopian context
Lemma, Tekalign; Lemu, Hirpa G.; Gutema, Endalkachew Mosisa (Peer reviewed; Journal article, 2023)The main objective of this study is to assess the awarness levels of acadamic staffs and industry experts towards the best practices of additive manufacturing (AM) in transforming traditional manufacturing (TM) in local ... -
Bio-inspired design trends for sustainable energy structures
Regassa, Yohannes; Dabasa, T.; Amare, G.; Lemu, Hirpa G. (Peer reviewed; Journal article, 2023)Researchers and engineers are constantly looking to nature for design inspiration as they work to create novel and effective energy conversion structures. Engineers are developing durable and resilient materials to survive ... -
Burst strength analysis of composite overwrapped pressure vessel using finite element method
Regassa, Yohannes; Lemu, Hirpa G.; Sirhabizu, Belete (Peer reviewed; Journal article, 2021)The purpose of this numerical study was to investigate the burst performance of a type III composite overwrapped pressure vessel (COPV) using finite element methods. An Aluminum overwrapped composites pressure vessel was ... -
A Case Study on Topology Optimized Design for Additive Manufacturing
Gebisa, Aboma Wagari; Lemu, Hirpa G. (Journal article; Peer reviewed, 2017-12)Topology optimization is an optimization method that employs mathematical tools to optimize material distribution in a part to be designed. Earlier developments of topology optimization considered conventional manufacturing ... -
Case study on topology optimized design for additive manufacturing
Lemu, Hirpa G.; Aliyi, A.M. (Peer reviewed; Journal article, 2019-10)Additive Manufacturing (AM), also known as rapid prototyping, rapid manufacturing, layer manufacturing and three-dimensional printing, represents one of the most promising aspects of manufacturing for highly complex ... -
Characterization of acoustic emission signals under 3-point bending test
Nguyen, Bao; Lemu, Hirpa G.; Gabrielsen, Ole; El-Thalji, Idriss (Peer reviewed; Journal article, 2021)This paper summarizes a master’s thesis project which explored whether the characteristics of Acoustic Emission Testing (AET) signals can be used to detect yielding in steel samples undergoing a three-point bending test. ... -
Critical Review of Comparative Study of Selective Laser Melting and Investment Casting for Thin-Walled Parts
Dejene, Naol Dessalegn; Lemu, Hirpa G.; Gutema, Endalkachew Mosisa (Peer reviewed; Journal article, 2023)Thin-walled structures are a significant and growing portion of engineering construction, with a wide range of applications, including storage vessels, industrial buildings, warehouses, aircraft, automobiles, bridges, ... -
Design for manufacturing to design for Additive Manufacturing: Analysis of implications for design optimality and product sustainability
Gebisa, Aboma Wagari; Lemu, Hirpa G. (Journal article; Peer reviewed, 2017-10)In response to the development of new materials, improved design methods, and increased societal demands to manufactured products, Design for Manufacturing (DfM) concept has paved the way to incorporate these demands into ... -
Design, simulation and production of hydraulic briquette press for metal chips
Kebede, Bisrat M.; Lemu, Hirpa G. (Peer reviewed; Journal article, 2019)Removal of metal chips are involved in several industrial production processes that machine from casted parts by various operations such as turning, milling and drilling. In addition to the fact that the chips represent a ... -
Effect of Interference Size on Contact Pressure Distribution of Railway Wheel Axle Press Fitting
Irena, Kitesa Akewaq; Lemu, Hirpa G.; Kedir, Yahiya Ahmed (Peer reviewed; Journal article, 2023)Mechanical couplings in engineering usually use interference fits to connect the shaft and hub. A railway wheel axle is a press fit that is connected by interference and can be subjected to bending stress. In loaded press ... -
Effect of Lubrication on Friction in Bending under Tension Test-Experimental and Numerical Approach
Trzepiecinski, Thomasz; Lemu, Hirpa G. (Peer reviewed; Journal article, 2020)This paper is aimed to determine the value of coefficient of friction (COF) at the rounded edge of the die in the sheet metal forming operations using the bending under tension (BUT) test. The experimental part of the ... -
Effect of Pressing Parameters on the Quality of Joint Formation of Heat Exchanger Fins with the Base Plate
Marek, Kowalik; Trzepiecinski, Thomasz; Lemu, Hirpa G. (Peer reviewed; Journal article, 2019)In this paper, the results of experimental and numerical studies on joining the thin fins to the thick base plate of a heat exchanger are presented. The elements of the heat exchanger were joined by using developed method ... -
Experimental and Numerical Studies of Stress Distribution in an Expanding Pin Joint System
Salahshour Langeroodi, Soheil; Karlsen, Øyvind; Lemu, Hirpa G. (Peer reviewed; Journal article, 2022)Pin joints are widely used mechanisms in different industrial machineries such as aircrafts, cranes, ships, and offshore drilling equipment providing a joint with possibility of relative rotation about one single axis. The ... -
Experimental and numerical study of Bondura® 6.6 PIN joints
Berkani, Imad; Karlsen, Øyvind; Lemu, Hirpa G. (Journal article; Peer reviewed, 2017)Pin joints are widely used in heavy-duty machinery such as aircrafts, cranes and offshore drilling equipment to transfer multi-dimensional shear forces. Their strength and service life depend on the clamping force in the ... -
Experimental investigation and ANN prediction for part quality improvement of fused deposition modeling parts
Tura, Amanuel; Mamo, Hanna; Jelila, Yohannis; Lemu, Hirpa G. (Peer reviewed; Journal article, 2021)Fused deposition modeling (FDM) is the most prevalent thermoplastic additive manufacturing technology. Many input parameters and their settings have a significant impact on the quality and functionality of FDM parts produced. ... -
Experimental Investigation on Effect of Weight Fraction of Sisal Fiber on Mechanical Properties of Sisal-E-Glass Hybrid Polymer Composites
Gurmu, Debela N.; Lemu, Hirpa G. (Peer reviewed; Journal article, 2023)Currently, hybridizing natural fibers with synthetic fiber is considered as the best solution for reducing the environmental pollution and the cost of materials. This is due to the lower mechanical properties and high water ... -
Experimental study of physical, chemical and mechanical properties of enset and sisal fibers
Bekele, Abera E.; Lemu, Hirpa G.; Jiru, Moera G. (Peer reviewed; Journal article, 2021)The properties of composites depend on type and properties of the fiber, fiber structure and treatment. In this study, effects of NaOH treatment on the physical, chemical and mechanical properties of fibers collected from ...