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Employment of hyper-cycloidal oscillatory motion for finding the coefficient of rolling friction. Part 1: Theoretical model

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IOP Conference Series: Materials Science and engineering 2019年第1期514卷

作者： S Alaci R-D Pentiuc F C Ciornei I C Romanu L Irimescu F Buium Mechanics and Technologies Department Stefan cel Mare University of Suceava Romania Electrotechnics Department Stefan cel Mare University of Suceava Romania Mechanical Engineering Mechatronics and Robotics Department Gheorghe Asachi Technical University of Iasi Romania

The oscillation motions of physical pendula constructed with contacts between ball and cylindrical external surfaces for materializing the theoretical frictionless pivot point were applied for determining the coefficient of rolling friction (occurring as a characteristic of the relative motion between the contacting surfaces). The condition imposed for estimation of the coefficient of rolling friction consists in the requirement that the theoretical curve and the experimental data describing the decrease of angular amplitude should superpose each other. To be mentioned that specialized software for dynamic analysis characterizes the rolling friction by the internal damping of the contacting materials instead of applying the coefficient of rolling friction between the materials.

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Modelling and simulation of a hydraulic system used for wind turbines

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IOP Conference Series: Materials Science and engineering 2019年第1期595卷

作者： R-I Pelin I Tița Technical University 'Gheorghe Asachi' Iași Department of Mechanical Engineering Mechatronics and Robotics Iasi Romania Technical University 'Gheorghe Asachi' Iași Department of Fluid Mechanics Hydraulic and Pneumatic Machines and Systems Iasi Romania

For wind turbines, pitch control is essential. In some cases, especially in the case of large scale wind turbines, hydraulic control is used. In this paper a hydraulic system used in wind turbine pitch control is analysed. Modelling and simulation of hydraulic systems is necessary in order to acknowledge the drawbacks and advantages before starting the design of the system. By acknowledging, the differences between the model of a physical system and a system in a virtual environment, one can handle the improvement, in terms of price or time-consumption. Considering the proposed diagram of the pitch control hydraulic system, it is presented the block diagram created in MATLAB Simscape Fluids. Some results of the simulation are presented. There are included conclusions and plans for future work.

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Friction and wear resistance of Al2O3 40TiO2 (AMDRY 6250) coating of a pump shaft sleeve bearing

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IOP Conference Series: Materials Science and engineering 2020年第1期724卷

作者： V Paleu C Cîrlan Paleu B Istrate S Bhaumik C Munteanu Gheorghe Asachi Technical University of Iaşi Mechanical Engineering Faculty Mechanical Engineering Mechatronics and Robotics Department 63 D. Mangeron Blvd. 700050 Iaşi RO Tribology and Surface Interaction Research Laboratory Department of Mechanical Engineering SRM Institute of Science and Technology Kattankulathur IN

The equipment of wastewater treatment plants is continuously subjected to different kinds of wear, as corrosion, abrasion, cavitation, erosion etc. The most affected components are those of slurry pumps, the slurry producing intense abrasive wear. The service life of pumps (wear rings, sealing, bearings, impellers, and casings) can considerably be extended by proper coating. Before the implementation of a new coating in equipment, its friction and wear behaviour must be determined beside corrosion resistance. This paper presents the results of friction tests carried out on AMSLER machine. The tribological pair was composed by Al2O3 40TiO2 (AMDRY 6250) coating deposited on substrate of a pump shaft sleeve running against a rolling bearing steel disk in dry lubrication conditions. The experimental results are compared against those obtained for uncoated steel.

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Effect of microstructure on wear behaviour of aluminium 2014 (Al2014)

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IOP Conference Series: Materials Science and engineering 2020年第1期724卷

作者： S Bhaumik V Paleu D Chowdhury C Cîrlan Paleu S Datta Tribology and Surface Interaction Research Laboratory Department of Mechanical Engineering SRM Institute of Science and Technology Kattankulathur IN Gheorghe Asachi Technical University of Iaşi Mechanical Engineering Faculty Mechanical Engineering Mechatronics and Robotics Department 63 D. Mangeron Blvd. 700050 Iaşi RO

The paper investigates the effect of ageing on the hardness and wearing of Al2014. Precipitation hardening and ageing were carried out on the samples. The samples were solution treated at 550°C and were naturally aged. Quenching was carried out using ice-brine solution. Vickers Hardness were taken at regular intervals till 900 hours. The peak hardness value of the natural aged sample was found to be 86HV (93 hours) as compared to the untreated sample (32.4HV) The wear tests were conducted at 10N, 500rpm for 30 minutes. After the tribo test it was observed that the coefficient of friction increased by 7.06% in the naturally aged sample, but the wear rate in case of as-received samples was 46% higher than that of the naturally aged sample. The change in the microstructure of Al2014 is the primary reason for the difference in wear rate of the samples. The present work will help to understand the influence of heat treatment of aluminium alloy on wear properties.

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Preface

Mechanisms and Machine Science

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Mechanisms and Machine Science 2018年 57卷 V-VI页

作者： Doroftei, Ioan Oprisan, Cezar Pisla, Doina Lovasz, Erwin Christian Mechanical Engineering Mechatronics and Robotics Department Mechanical Engineering Faculty “Gheorghe Asachi” Technical University of Iaşi Iaşi Romania Mechanical Systems Engineering Department Machine Building Faculty Research Center for Industrial Robots Simulation Testing Technical University of Cluj-Napoca Cluj-Napoca Romania

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PyChart – A Python module for analysis and visual view of 2D/3D Charts

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Journal of Physics: Conference Series 2021年第1期1781卷

作者： D Nedelcu T Latinovic 'Eftimie Murgu' University of Resita Romania Faculty of Engineering and Management Department of Mechanical Engineering and Management Traian Vuia square no.1-4 320085 Resita University of Banja Luka Bosnia and Herzegovina Faculty of Mechanical Engineering Department of Mechatronics and Robotics Stepe Stepanovica 71 78000 Banja Luka

The paper describes the PyChart module (aimed at analysis and visual view of 2D/3D Charts), which was created with the help of free and Open Source resources, using Python as a programming language and *** as a graphical user interface toolkit. The chart data is imported from a Excel/CSV file with a template structure and is drawn in the PyChart module as XY or XYZ curves similar with Excel scatter with smooth lines and markers style. The main functions of the charts are activated using the toolbar. The module is provided with zooming instruments (fit, pan, zoom in, zoom out), cubic spline curves interpolation, chart intersection with constant X, Y or Z values, visual follow of the 2D chart points to view coordinates, export of data in Windows Clipboard, Excel or Microsoft Word format and saving the chart as a image file.

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Recent Advances in Triboelectric Nanogenerators: From Technological Progress to Commercial Applications

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ACS Nano 2023年第12期17卷 11087-11219页

作者： Choi, Dongwhi Lee, Younghoon Lin, Zong-Hong Cho, Sumin Kim, Miso Ao, Chi Kit Soh, Siowling Sohn, Changwan Jeong, Chang Kyu Lee, Jeongwan Lee, Minbaek Lee, Seungah Ryu, Jungho Parashar, Parag Cho, Yujang Ahn, Jaewan Kim, Il-Doo Jiang, Feng Lee, Pooi See Khandelwal, Gaurav Kim, Sang-Jae Kim, Hyun Soo Song, Hyun-Cheol Kim, Minje Nah, Junghyo Kim, Wook Menge, Habtamu Gebeyehu Park, Yong Tae Xu, Wei Hao, Jianhua Park, Hyosik Lee, Ju-Hyuck Lee, Dong-Min Kim, Sang-Woo Park, Ji Young Zhang, Haixia Zi, Yunlong Guo, Ru Cheng, Jia Yang, Ze Xie, Yannan Lee, Sangmin Chung, Jihoon Oh, Il-Kwon Kim, Ji-Seok Cheng, Tinghai Gao, Qi Cheng, Gang Gu, Guangqin Shim, Minseob Jung, Jeehoon Yun, Changwoo Zhang, Chi Liu, Guoxu Chen, Yufeng Kim, Suhan Chen, Xiangyu Hu, Jun Pu, Xiong Guo, Zi Hao Wang, Xudong Chen, Jun Xiao, Xiao Xie, Xing Jarin, Mourin Zhang, Hulin Lai, Ying-Chih He, Tianyiyi Kim, Hakjeong Park, Inkyu Ahn, Junseong Huynh, Nghia Dinh Yang, Ya Wang, Zhong Lin Baik, Jeong Min Choi, Dukhyun Kyung Hee University Gyeonggi Yongin17104 Korea Republic of Department of Electrical Engineering and Computer Science Massachusetts Institute of Technology 77 Massachusetts Avenue CambridgeMA02139 United States Department of Mechanical Engineering Soft Robotics Research Center Seoul National University Seoul08826 Korea Republic of Department of Mechanical Engineering Gachon University Seongnam13120 Korea Republic of Department of Biomedical Engineering National Taiwan University Taipei10617 Taiwan Frontier Research Center on Fundamental and Applied Sciences of Matters National Tsing Hua University Hsinchu30013 Taiwan School of Advanced Materials Science & Engineering Sungkyunkwan University Suwon16419 Korea Republic of Sungkyunkwan University 2066 Seobu-ro Gyeonggi Suwon16419 Korea Republic of Department of Chemical and Biomolecular Engineering National University of Singapore 4 Engineering Drive 4 117585 Singapore Division of Advanced Materials Engineering Jeonbuk National University 567 Baekje-daero Jeonbuk Jeonju54896 Korea Republic of Jeonbuk National University 567 Baekje-daero Jeonbuk Jeonju54896 Korea Republic of Department of Physics Inha University 100 Inha-ro Incheon22212 Korea Republic of School of Materials Science & Engineering Yeungnam University Gyeongbuk Gyeongsan38541 Korea Republic of 291 Daehak-ro Daejeon34141 Korea Republic of School of Materials Science and Engineering Nanyang Technological University 50 Nanyang Avenue 639798 Singapore Institute of Flexible Electronics Technology of Tsinghua Zhejiang Jiaxing314000 China Nanomaterials and System Lab Major of Mechatronics Engineering Faculty of Applied Energy System Jeju National University Jeju632-43 Korea Republic of School of Engineering University of Glasgow GlasgowG128QQ United Kingdom Seoul02792 Korea Republic of Department of Physics Inha University Incheon22212 Korea Republic of Suwon16419 Korea Republic of Department of

Serious climate changes and energy-related environmental problems are currently critical issues in the world. In order to reduce carbon emissions and save our environment, renewable energy harvesting technologies will serve as a key solution in the near future. Among them, triboelectric nanogenerators (TENGs), which is one of the most promising mechanical energy harvesters by means of contact electrification phenomenon, are explosively developing due to abundant wasting mechanical energy sources and a number of superior advantages in a wide availability and selection of materials, relatively simple device configurations, and low-cost processing. Significant experimental and theoretical efforts have been achieved toward understanding fundamental behaviors and a wide range of demonstrations since its report in 2012. As a result, considerable technological advancement has been exhibited and it advances the timeline of achievement in the proposed roadmap. Now, the technology has reached the stage of prototype development with verification of performance beyond the lab scale environment toward its commercialization. In this review, distinguished authors in the world worked together to summarize the state of the art in theory, materials, devices, systems, circuits, and applications in TENG fields. The great research achievements of researchers in this field around the world over the past decade are expected to play a major role in coming to fruition of unexpectedly accelerated technological advances over the next decade. © 2023 The Authors. Published by American Chemical Society

关键词： Nanogenerators

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A new technique for improving the dispersion of a set of samples. Application in multi-query motion planning

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AIP Conference Proceedings 2015年第1期1660卷

作者： Weria Khaksar Tang Sai Hong Khairul Salleh Bin Mohamed Sahari Mansoor Khaksar aCentre for Advanced Robotics and Mechatronics Universiti Tenaga Nasional Jalan IKRAM-UNITEN 43000 Kajang Selangor Malaysia cDepartment of Industrial Engineering Sanandaj Branch Islamic Azad University Sanandaj Iran bDepartment of Mechanical Engineering University Putra Malaysia 43400 Serdang Selangor Malaysia

In this paper, we proposed a new learning strategy for probabilistic roadmap (PRM) algorithm. The proposed strategy is based on reducing the dispersion of the generated set of samples. We defined a forbidden range around each selected sample and ignore this region in further sampling. The resulted planner called LD-PRM is an effective multi-query sampling-based planner which is able to solve motion planning queries with smaller graphs. Simulation results indicated that the proposed planner improve the runtime of the PRM algorithm. Furthermore, the proposed planner is able to solve difficult motion planning cases including narrow passages and bug traps, which is a difficult task for classic sampling-based algorithms. For measuring the uniformity of the generated samples, a new algorithm was created to measure the dispersion of a set of samples based on any desired resolution. Also, comparison studies are provided to support the superiority claim of the proposed algorithm.

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Development of Microcontroller-Based Manipulator Arm: A Trilemma Problem-Solving Framework for robotics and STEM Education in Nigerian Schools

Development of Microcontroller-Based Manipulator Arm: A Tril...

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Technologies Applied to Electronics Teaching (TAEE)

作者： Mbadiwe S. Benyeogor Tobore L. Igbigbi Olusegun I. Lawal Udoh T. Akpan Andrew O. Benyeogor Nnaemeka M. Mbachu Kosisochukwu P. Nnoli Muhammad S. Aliero Adeboye Olatunbosun Institute of Physics University of Münster Münster Germany Department of Public Utilities City of Cleveland Ohio State USA Advanced Aerospace Engines Lab. Nat. Space Research & Dev. Agency Oka Akoko Ondo State Nigeria Dept. Mechatronics Engineering Lagos State Univ. of Sc. & Tech. Ikorodu Lagos State Nigeria CTE Computer Science & Robotics International Leadership of Texas Aggieland Texas USA Dept. Comp. Sc. & Electrical Engineering Constructor University Bremen Germany ICT Department Kebbi State Univ. of Sc. & Tech Aliero Nigeria Dept. Electrical & Electronics Engineering Ajayi Crowther University Oyo Town Oyo State Nigeria

ISBN: (数字)9798350348675

ISBN: (纸本)9798350348682

Advances in microprocessor technology and software engineering have resulted in the development of sophisticated robots that are used in modern society as assistive automata for production, security, and farming, among other things. To sustain the development of robots, robotics education should be included in school curricula (i.e., teaching and learning process). However, schools in many developing nations, such as Nigeria, are unable to adapt to this trend due to personnel, technological, infrastructural, and fiscal limitations. To address this problem, a low-cost robotic manipulator arm with real-time control algorithms and a human-robot interface that allows it to be controlled by a microcomputer is developed. This includes its functional model, geometry of link movement, mechanical design, control circuitries, and a Teraterm-based human-robot interface (HRI). Furthermore, an encryption method was developed that maps selected control keys to actuation functions in manipulator chains. We also explored how this robotic manipulator may be used as a teaching tool, particularly for teaching three major industrial technologies: machine-making, electronics, and computing. Our manipulator arm has undergone both unit and system tests and has been used for classroom teaching. Results of its applicability assessment show that our system could aid the teaching of robotics and STEM subjects in schools, as a way to solve the trilemma of harmonizing the concept of machines, electronic control, and computation in multidisciplinary domains.

关键词： Service robots Educational robots Education Manipulators Real-time systems Production facilities Security

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Utilization of Tabu search heuristic rules in sampling-based motion planning

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AIP Conference Proceedings 2015年第1期1660卷

作者： Weria Khaksar Tang Sai Hong Khairul Salleh Mohamed Sahari Mansoor Khaksar aCentre for Advanced Robotics and Mechatronics Universiti Tenaga Nasional Jalan IKRAM-UNITEN 43000 Kajang Selangor Malaysia cDepartment of Industrial Engineering Sanandaj Branch Islamic Azad University Sanandaj Iran bDepartment of Mechanical Engineering University Putra Malaysia 43400 Serdang Selangor Malaysia

Path planning in unknown environments is one of the most challenging research areas in robotics. In this class of path planning, the robot acquires the information from its sensory system. Sampling-based path planning is one of the famous approaches with low memory and computational requirements that has been studied by many researchers during the past few decades. We propose a sampling-based algorithm for path planning in unknown environments using Tabu search. The Tabu search component of the proposed method guides the sampling to find the samples in the most promising areas and makes the sampling procedure more intelligent. The simulation results show the efficient performance of the proposed approach in different types of environments. We also compare the performance of the algorithm with some of the well-known path planning approaches, including Bug1, Bug2, PRM, RRT and the Visibility Graph. The comparison results support the claim of superiority of the proposed algorithm.

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