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2024 International Conference on Electrical Machines, ICEM 2024

作者： Park, Soo-Hwan Kim, Jae-Hyun Park, Chi-Sung Won, Yun-Jae Lim, Myung-Seop Dongguk University Department of Mechanical Robotics and Energy Engineering Seoul Korea Republic of School of Mechanical Engineering Yeungnam University Daegu Korea Republic of Hanyang University Department of Automotive Engineering Seoul Korea Republic of Automotive-Computer Convergence Hanyang University Department of Automotive Engineering Seoul Korea Republic of

ISBN: (纸本)9798350370607

This paper deals with the vibration characteristics of permanent magnet synchronous motors (PMSMs) when there is time-varying load generated in the reciprocating compressor. As the reciprocating mechanism is necessary for compressing the refrigerant, the time-varying load torque is inevitable in compressor. However, this load torque affects to the system dynamics such as the speed fluctuation. These speed ripple cause unexpected vibration characteristics because they induce sideband components in the time harmonics of the electromagnetic force of PMSM. Therefore, we analyzed the vibration characteristics of PMSM according to time harmonics variation and conduct a study to suppress sideband vibration by adopting harmonic current injection method. © 2024 IEEE.

关键词： Permanent magnets

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A Study on Laser Beam Machining and Prediction of Surface Finish and Material Removal Rate by Fuzzy Clustering 1st

A Study on Laser Beam Machining and Prediction of Surface Fi...

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1st International Conference on Energy and Materials Technologies, ICEMT 2021

作者： Devanathan, C. Giri, R. Dhandapani, S. Muthiah, C.T. Sivanand, A. Department of Mechanical Engineering Rajalakshmi Engineering College Thandalam Chennai602105 India Department of Robotics and Automation Rajalakshmi Engineering College Thandalam Chennai602105 India

ISBN: (纸本)9789811938948

Laser beam machining is a non-traditional manufacturing method which melts, vaporizes and thermally changes the characteristics of the material by focusing a monochromatic coherent light beam on the workpiece. This research article focuses on studying the laser beam machining of mild steel material by varying the input parameters like cutting speed, gas pressure and laser power. The parameters were varied in three levels, and totally, nine experiments were conducted based on orthogonal array. The output parameters such as material removal rate and surface roughness were analyzed, and the experimental results revealed that cutting speed and laser power were the most dominating parameter for getting good surface refinish and better material removal rate, respectively. The interaction effects of the parameters were also significant. The fuzzy c-means (FCM) clustering and fuzzy subtractive clustering (FSC)-based fuzzy inference systems are modeled to predict the output characteristics material removal rate (MRR) and surface roughness. It is found that the fuzzy subtractive clustering-based fuzzy inference systems are very effective in predicting the outputs. © 2023, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Surface roughness

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Characteristics of Heat Transfer of Cooling Tower Flat Type Flat Storage 4th

Characteristics of Heat Transfer of Cooling Tower Flat Type ...

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4th International Conference on Experimental and Computational Mechanics in engineering, ICECME 2022

作者： Rajai, Afdhalul Syuhada, Ahmad Razali Master of Mechanical Engineering Program Faculty of Engineering Universitas Syiah Kuala Banda Aceh23111 Indonesia Department of Mechanical Engineering Universitas Syiah Kuala Darussalam Banda Aceh23111 Indonesia

ISBN: (纸本)9789819974948

Cooling tower is a heat transfer device that works through water media, along with air used to cool the temperature using water media with direct contact with air which causes some of the water to evaporate. To improve the performance of the cooling tower, many trials and research have been carried out, one of which is by adjusting the hole in the cooling tower area as a liquid medium distribution. From this phenomenon, this study examines the effect that occurs on the number of holes on the rate of movement of the flat plate cooling tower with the overall height of the cooling tower 2.4 m, the number of distribution media for the cooling tower water flow is 5 plates in succession, and the length of each plate is 0.7 m with a width of 0.5 m. Plate variations are given to the cooling tower, namely plate without holes, plate 25 plate holes, 35 holes, 45 holes zig-zag hole model on the cooling tower. The diameter of each plate hole is 0.02 m with the slope ratio of each plate arrangement which is 15°. The results showed the highest heat transfer rate occurred in the cooling tower water inlet temperature of 75 °C. The plate variation used was the plate without the inlet hole model. And the lowest heat transfer rate occurs at the inlet water temperature of 55 °C with a plate variation of 45 holes with a zig-zag hole model. So that the variation of the hole pattern affects the temperature change with the heat transfer rate on the tower performance. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.

关键词： Cooling towers

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An effect of process parameters during wire cut electrical discharge machining of Inconel 738 3

An effect of process parameters during wire cut electrical d...

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3rd International Conference on Sustainable Energy Solutions for a Better Tomorrow, SESBT 2022

作者： Devanathan, C. Natarajan, M.S. Shankar, E. Giri, R. Vigneshwaran, K. Department of Mechanical Engineering Rajalakshmi Engineering College Chennai602 105 India Department of Robotics and Automation Rajalakshmi Engineering College Chennai602 105 India

In the recent days, super alloys especially nickel based materials are used more than 50% of aerospace gas turbine components such as turbine disc, blades etc., It becomes very hard to shape these materials with the use of traditional machining processes due to its improved strength at higher temperature. To overcome the issues faced during conventional machining, the various advanced machining techniques are tried for machining these super alloys. In the present study, Inconel 738 was cut by wire electrical discharge machining using 0.25 mm diameter copper wire. Demineralized water was used as dielectric fluid between tool and workpiece electrode. During the process, voltage, wire feed rate, time of pulse on and pulse off were adjusted at four different values and totally sixteen slots were cut to analyze the machining characteristics. The machined surfaces were tested for its surface finish, rate of material removal and kerf width. The ANOVA was performed using Minitab software to find out the optimized variables and percentage contribution of each parameter in providing the influencing results. Wire feed rate was the most influencing parameter to have the lowest kerf width. As far as Material removal rate, the four parameters were had the significant impact in increasing the MRR. Voltage is the important process parameter to reduce the surface roughness. © 2023 Elsevier Ltd. All rights reserved.

关键词： Surface roughness

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Designing Manufacturing Enterprises System for Industry 4.0

Designing Manufacturing Enterprises System for Industry 4.0

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IISE Annual Conference and Expo 2024

作者： Garbie, Ibrahim Garbie, Muhammad Department of Mechanical Engineering Industrial Engineering Program College of Engineering Helwan University Cairo Egypt Department of Industrial Systems and Manufacturing Engineering Texas Tech University LubbockTX United States

ISBN: (纸本)9781713877851

Currently, researchers are concentrating their attention on design for manufacturing, design for assembly, design for cost and design for quality, design for complexity, design for reconfiguration, design for sustainability, and design for X…etc., but they do not mention design manufacturing enterprises system for Industry 4.0. The design manufacturing enterprises system for Industry 4.0 is a systemic approach that simultaneously identifies elements and components for designing manufacturing enterprises for Industry 4.0, taking into consideration the new urgency of adopting Industry 4.0 and the challenges and risk management for implementing Industry 4.0. In this paper, the designing analysis and level will be presented by identifying the relative importance of urgent adoption and the challenges of implementing Industry 4.0. © IISE Annual Conference and Expo *** rights reserved.

关键词： Smart manufacturing

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Multi-criteria decision model for selection of a material suitable to lightning strike protection in aerospace applications

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Materials Today: Proceedings 2022年 59卷 725-733页

作者： Himagireesh, Ch. Ramji, K. Durga Prasad, K.G. Hari Kiran, V. Department of Mechanical Engineering Engineering and Technology Program GayatriVidyaParishad College for Degree & P.G.Courses Andhra Pradesh Visakhapatnam India Department of Mechanical Engineering Andhra University Visakhapatnam India Department of Mechanical Engineering Avanthi Institute of Engineering and Technology Andhra Pradesh India

In order to protect the aerospace structures against electromagneticinterference (EMI) caused by lightning strikes, metallic meshes or foils are currently being used. But the additional weight of metallic meshes cause counterbalance of weight saving imparted by the composite materials. In this context, Al6061 hybrid metal matrix composite specimens with different proportions of SiC, Al2O3 and fly ash particulates as reinforcement materials have been prepared and tested their characteristics suitability to lightning strike protection (LSP). As there is a conflicting nature among these properties a multi-criteria decision model using AHP, Entropy and TOPSIS techniques with a view to select appropriate specimen to meet the objective. The results of the proposed decision model are compared with that of the other methods VIKOR and PROMETHEE so as to validate the results. The same weightages for the properties are used in all the three methods. The proposed decision model is the robust one for ranking of the materials. © 2021

关键词： Aluminum oxide

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Analysis of Sandwich Structures with 3D-Printed Kresling Origami Cores

Analysis of Sandwich Structures with 3D-Printed Kresling Ori...

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AIAA Science and Technology Forum and Exposition, AIAA SciTech Forum 2025

作者： Hossain, Md Shahjahan Csercsevits, Vincent Seshaiah, Kira Bateniparvar, Omid Ghosh, Ranajay Department of Mechanical and Aerospace Engineering University of Central Florida OrlandoFL United States Department of Mechanical Engineering Widener University ChesterPA United States Smith College Picker Engineering Program NorthamptonMA United States

ISBN: (数字)9781624107238

ISBN: (纸本)9781624107238

Lightweight structures with bioinspired metamaterials, with their uniquely engineered properties not found in naturally occurring materials, have garnered significant attention for their potential in various engineering applications. This study explores the mechanical behavior of sandwich plate structures utilizing the Kresling origami pattern, fabricated through a straightforward 3D printing process. By conducting 3-point bending and compression tests, as well as simulations with Abaqus software, the research investigates the distinctive mechanical properties and performance enhancements these origami-inspired structures offer under mechanical loading. This study is noteworthy for being the first to investigate the bending characteristics of sandwich structures utilizing the two cell Kresling pattern or double Kresling, an area that has not been previously explored. Utilizing the Kresling structure in sandwich panels poses a challenge due to its rotational behavior. To address this, we employ a double Kresling pattern, which confines the rotation to the middle layer. This approach ensures that the outer layers remain stable, maintaining the overall integrity of the sandwich panel structure during deformation under mechanical loading. The findings reveal that the 3D-printed Kresling origami core significantly reduces weight while maintaining structural integrity, making it especially beneficial for aerospace engineering, where lightweight yet strong materials are crucial. This research highlights the potential of Kresling-patterned sandwich plates to improve efficiency and performance in supersonic vehicles, providing valuable insights into their structural efficiency and applicability in advanced engineering fields. © 2025, American Institute of Aeronautics and Astronautics Inc, AIAA. All rights reserved.

关键词： Compression testing

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Wind energy as a source of green hydrogen production in the USA

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Clean Energy 2023年第1期7卷 8-22页

作者： Ashish Sedai Rabin Dhakal Shishir Gautam Bijaya Kumar Sedhain Biraj Singh Thapa Hanna Moussa Suhas Pol National Wind Institute Texas Tech UniversityLubbockTX 79401USA Department of Mechanical Engineering Texas Tech UniversityLubbockTX 79401USA Department of Mechanical Engineering Tribhuvan UniversityPurbanchal CampusDharanNepal Green Hydrogen Lab Department of Mechanical EngineeringKathmandu UniversityDhulikhelNepal Wind Energy Program Texas Tech UniversityLubbockTX 79401USA

The study incorporates an overview of the green hydrogen-production potential from wind energy in the USA,its application in power generation and the scope of substituting grey and blue hydrogen for industrial *** 10 million metric tons of grey and blue hydrogen is produced in the USA annually to fulfil the industrial demand,whereas,for 1 million metric tons of hydrogen generated,13 million metric tons of CO_(2) are released into the *** research aims to provide a state-of-the-art review of the green hydrogen technology value chain and a case study on the production of green hydrogen from an 8-MW wind turbine installed in the southern plain region of *** research estimates that the wind-farm capacity of 130 gigawatt-hours is required to substitute grey and blue hydrogen for fulfilling the current US annual industrial hydrogen demand of 10 million metric *** study investi-gates hydrogen-storage methods and the scope of green hydrogen-based storage facilities for energy produced from a wind *** research focuses on the USA’s potential to meet all its industrial and other hydrogen application requirements through green hydrogen.

关键词： green hydrogen wind energy electrolysis greenhouse gases

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Predictive Modeling of Human Fatigue in a Manufacturing-Like Setting

Predictive Modeling of Human Fatigue in a Manufacturing-Like...

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2024 American Control Conference, ACC 2024

作者： Rafter, Abigail Tilbury, lDawn M. Barton, Kira University of Michigan Robotics Department Ann Arbor United States University of Michigan Mechanical Engineering Department Ann Arbor United States

ISBN: (纸本)9798350382655

Humans are an essential part of Smart Manufacturing systems. While modeling machines based on real-time data and knowledge from subject matter experts has been widely explored, modeling humans has not. Modeling humans presents significant challenges due to the heterogeneity of individuals and the stochasticity that may be introduced through individual decisions based on events. We hypothesize that human behavior within a controlled environment and task will lie within a predictable scope that can give insight into future behavioral states of humans, such as fatigue. Human fatigue affects workers' productivity, safety, and performance in manufacturing systems. We define fatigue as measurable tiredness resulting from physical exertion. If we can predict when a human worker will become fatigued, breaks or task changes can be preemptively incorporated into system planning to maintain desired levels of productivity and safety. In this paper, we propose a modeling structure to describe fatigue in humans performing repetitive, manufacturing-like tasks. Using first order techniques, the model incorporates task context and physiological sensor data. A case study in which the participant completes a repetitive cable assembly task provides a demonstration of model development. We derived linear time-invariant state space models that are capable of predicting fatigue levels with high accuracy over a 20 minute time horizon. © 2024 AACC.

关键词： Smart manufacturing

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Sustainability of Manufacturing Enterprises: A Psychological Perspective of Linking Manufacturing Layers

Sustainability of Manufacturing Enterprises: A Psychological...

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IISE Annual Conference and Expo 2024

ISBN: (纸本)9781713877851

As sustainability/sustainable development (S/SD) is still considered the buzzword in manufacturing environments, particularly after showing up and joining Industry 4.0 (I4.0), S/SD is prescribed to be embraced as one of the major perspectives of actualizing I4.0. Manufacturing, in common, is separated into three primary streams or layers. These layers are represented by machine design (MD), manufacturing processes (MP), and manufacturing systems (MS). All these layers constitute manufacturing enterprises. Although these layers coincide or overlap at one point, there's a psychological link between them. The primary layer is called the core and is dependable for designing machine components. The second layer is called the chosen layer, and it is represented by the manufacturing process with which generation operations will be adopted. The final layer could be a given one and is utilized to demonstrate which manufacturing system can be chosen. This paper aims to discover the S/SD for these layers and the psychological interface between them. In this paper, components of these three layers will be distinguished and analyzed, and the S/SD index of linking these layers through a psychological perspective will be proposed and outlined independently and universally. © IISE Annual Conference and Expo *** rights reserved.

关键词： Smart manufacturing

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