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Research on Virtual simulation Experiment Center Construction Practice and Resource Sharing Management Mechanism——Taking mechanical Foundation and Textile Equipment Experiment Center as an Example

Research on Virtual Simulation Experiment Center Constructio...

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The 1st International Conference on Education, Management Science and Economics (ICEMSE 2016)

作者： Yang Jiancheng Wang Zhifang Yang Tao Li Xinrong Li Dandan Zhao Yongli School of Mechanical Engineering Tianjin Polytechnic University Tianjin Key Laboratory of Modern Electromechanical Equipment Technology Virtual Simulation Experiment Teaching Center for Mechanical Foundation and Textile Equipment Design

In order to promote the opening and sharing of virtual simulation experiment teaching resources,this paper expatiates on the construction content and characteristics of virtual simulation experiment center of mechanical foundation and textile equipment based on the construction work of "virtual simulation experiment teaching center for mechanical foundation and textile equipment design" of school of mechanical engineering,Tianjin polytechnic *** paper studies and proposes the sharing management mechanism of the resources of virtual simulation experiment center for mechanical foundation and textile equipment,and predicts the follow-up sharing management of the resources of virtual simulation experiment center for mechanical foundation and textile equipment.

关键词： mechanical foundation and textile equipment virtual simulation experiment sharing management mechanism

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Effect of process parameters on deformation behavior of AA 5052 sheets in stretch flanging process

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Materials Today: Proceedings 2017年第8期4卷 9316-9326页

作者： Yogesh Dewang M.S. Hora S.K. Panthi Department of Mechanical Engineering Lakshmi Narain College of Technology Bhopal 462021 India Department of Civil Engineering Maulana Azad National Institute of Technology Bhopal 462003 India Computer Simulation & Design Centre Advanced Materials Processes and Research InstituteBhopal462024 India

Aluminum alloys are widely used in manufacturing of aircrafts and in automotive industry. In this paper aluminum alloy 5052 of 0.5 mm thickness was utilized to investigate deformation behavior in stretch flanging process. The effect of process parameters such as initial flange length, punch-die clearance and blank-holding force were investigated using FE simulation and experimentation. The results show that the circumferential strain and radial strain increases with increase in initial flange length and blank-holding force and decreases with increase in punch-die clearance. Experimental investigations were also carried out to validate FE simulation results. A very good agreement was obtained between FE simulation results and experimental in terms of punch load and edge crack location and propagation.

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Keep Your Friends Close and Your Colleagues Nearby: The Hidden Ties That Improve STEM Education

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Change 2019年第1期51卷 42页

作者： Mestre, Jose P. Herman, Geoffrey L. Tomkin, Jonathan H. West, Matthew Jose P. Mestre (mestre@illinois.edu). A theoretical nuclear physicist by training Mestre’s research focuses on the learning of physics contributing in areas such as the acquisition and use of knowledge by experts and novices transfer of learning problem solving and instructional design. He has offered Congressional testimony on The Science of Learning has published numerous articles and books and is a Fellow of the American Physical Society.http://***/0000-0003-2110-1954 Geoffrey L. Herman (glherman@illinois.edu). Herman has a Ph.D. in Electrical and Computer Engineering and is a Teaching Assistant Professor in Computer Science and a Research Assistant Professor in the Department of Curriculum & Instruction at the University of Illinois. His research focuses on how students learn engineering and computing concepts and studying processes for creating systemic instructional change in college settings. Previously he was a postdoctoral researcher in Engineering Education at Purdue University.http://***/0000-0002-9501-2295 Jonathan H. Tomkin (tomkin@illinois.edu). Tomkin is a mathematically based geoscientist with two research focus areas: first he uses models and large data sets to determine how climates glaciers tectonics and landscapes interact. Second he explores how new technological and organizational approaches can improve STEM education. He produced the first geoscience MOOC is the editor of an open-source textbook and has published widely in both geoscience and STEM education. Matthew West (mwest@illinois.edu). Matthew West is an Associate Professor of Mechanical Science and Engineering at the University of Illinois with research interests in scientific computing that include time integration of deterministic and stochastic systems distributed computation and particle methods for simulation and estimation. In education he researches computer-based assessment and the development of innovative teaching cultures. Professor West is a University of Illinois Distinguished Teacher-Scholar and Colleg

A science department on the campus of the University of Illinois has received numerous national awards for excellence in undergraduate teaching. The secret to their success? For nearly two decades, they have collaboratively used evidence-based instructional practices (EBIP) in their introductory level courses. Despite these successes and efforts to spread their EBIP, no other departments followed this department's lead. Then, suddenly six years ago, many instructors from other departments began adopting EBIP in their classrooms. This article asks what was the catalyst for this change? Why had previous attempts at institutional change failed? The authors answer these questions by analyzing their efforts to transform the teaching practices in large-enrollment science and engineering introductory courses on their campus.

关键词： STEM Education Evidence Based Practice Teaching Methods Undergraduate Study College Faculty Educational Change Communities of Practice Mentors School CultureIllinois

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Robust optimization design of the Mars airbag lander

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Zhongguo Jixie Gongcheng/China mechanical engineering 2017年第1期28卷 20-26页

作者： Qing, Qixiang Qing, Xiang Xiao, Jiuru Liao, Huidong The Key Laboratory of Advanced Design and Simulation Techniques for Special Equipment of MOE Hunan University Changsha410082 China State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body Hunan University Changsha410082 China Mechanical and Electrical Engineering Central South University of Forestry and Technology Changsha410004 China

Mars airbag lander was a complex structure with many critical parameters, extreme environment conditions, many uncertain factors and high reliability requirements. Computational efficiency of simulation was always a bottleneck problem in the processes of optimization design for the Mars airbag landers. Based on parallel and distributed computing technologies of super computing platforms and the multi-objective robust optimization method, a robust optimization design for the complex airbag system was carried out. The results show that the applications of supercomputer platform may greatly improve the robust optimization's computational efficiency in the optimization design, and the reliability of the Mars airbag lander will be highly improved. © 2017, Chinese mechanical engineering Society. All right reserved.

关键词： Computational efficiency

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Anti-controlling pitchfork bifurcation on Poincaré map of a three-degree-of-freedom vibro-impact system

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Zhendong yu Chongji/Journal of Vibration and Shock 2016年第20期35卷 24-29页

作者： Wu, Xin Xu, Huidong Wen, Guilin Wei, Kexiang School of Mechanical Engineering Hunan Institute of Engineering Xiangtan411104 China Key Laboratory of Advanced Design and Simulation Techniques for Special Equipment of Education Ministry Hunan University Changsha410082 China College of Mechanics Taiyuan University of Technology Taiyuan030024 China

In the premise of not changing periodic solutions of the original system and with considering the difficulties that are given by the implicit Poincaré map of the vibro-impact system, anti-control of Pitchfork bifurcation on Poincaré map of a three-degree-of-freedom vibro-impact system was studied by using the linear feedback control method. Firstly, the six-dimensional Poincaré map of a close-loop system was established. To overcome the difficulty that the numerical computing method can only be used to determine control gains on the basis of the classical critical criteria of Pitchfork bifurcation described by the properties of eigenvalues in the six-dimensional map, an explicit pitchfork critical criterion without using eigenvalues was used to obtain the controlling parameters area of two parameters. Then, the stability of the pitchfork bifurcation was further analyzed by utilizing the center manifold and normal formal theory. Finally, the numerical experiments verify that the stable pitchfork bifurcation solutions can be generated at arbitrary specified parameters. © 2016, Editorial Office of Journal of Vibration and Shock. All right reserved.

关键词： Degrees of freedom (mechanics)

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simulation and Evaluation of a Public Transport Priority Methodology

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Transportation Research Procedia 2015年 6卷 402-410页

作者： G. Malandraki I. Papamichail M. Papageorgiou V. Dinopoulou Dynamic Systems and Simulation Laboratory School of Production Engineering and Management Technical University of Crete 73100 Chania Greece Department of Mechanical and Industrial Design Engineering Technological Education Institute (TEI) of West Macedonia Koila Kozani 50100 Greece

The development of methodologies for bus priority at traffic signals is a research field that continues to grow since the need to improve public transport (PT) is nowadays higher compared to the previous decades. Several ways have been used to attract people to use PT means. These attempts can be distinguished in two basic categories: facility-design-based measures and signal-control-based measures. In this paper, a signal-control-based methodology is presented and implemented in a microscopic simulation environment emulating the network of Chania, Greece, with realistic traffic conditions. The control objective is to minimize the average delay time for the buses without creating major disturbances to the rest of the network. For this reason, apart from a fixed-time strategy combined with public transport priority (PTP), the traffic-responsive urban control (TUC) strategy with PTP is implemented in order to reduce the delays also for the private vehicles as well.

关键词： signal control public transport priority traffic-responsive urban control

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Vibration suppression of fuel sloshing using subband adaptive filtering

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International Journal of engineering, Transactions A: Basics 2015年第10期28卷 1124-1131页

作者： Khoshnood, A.M. Kavianipour, O. Department of Aerospace Engineering Center of Excellent of Design and Simulation of Space Systems K. N. Toosi University of Technology Tehran Iran Department of Mechanical Engineering Damavand Branch Islamic Azad University Damavand Iran

One of the main vibration problems of aerospace vehicles with liquid fuel propulsion system is fuel sloshing. This phenomenon is a low frequency vibrational challenge can affect on the motion of the vehicle and can degrade the stability of the main control system. In this regards, the motion of the liquid will be very critical when the frequency of the sloshing is very close to the frequencies of the main dynamic system. In addition, dominant frequencies of the sloshing are varied due to the flight time in the aerospace vehicles. In this paper, an aerospace launch vehicle with fuel sloshing is considered as a multi body dynamic system and in order to reduce the undesired effects of the fuel vibration, a new subband adaptive filter based on the Lyapunov theorem and the Discrete Fourier Transform (DFT) is designed. In this way, the new control system is implemented on the attitude control of the vehicle and the simulation of the nonlinear model is carried out. Numerical results of the simulation show the effects of the fuel sloshing on the vehicle are effectively omitted by means of the new subband adaptive controller.

关键词： Bandpass filters

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Anti-controlling Hopf-Hopf interaction bifurcations on Poincaré map of a three-degree-of-freedom vibro-impact system with clearance

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Zhendong Gongcheng Xuebao/Journal of Vibration engineering 2015年第6期28卷 952-959页

作者： Xu, Hui-Dong Wen, Gui-Lin Wu, Xin Zhang, Si-Jin College of Mechanics Taiyuan University of Technology Taiyuan030024 China State Key Laboratory of Advanced Design and Manufacture for Vehicle Body Hunan University Changsha410082 China College of Mechanical and Vehicle Engineering Hunan University Changsha410082 China Key Laboratory of Advanced Design and Simulation for Special Equipment Ministry of Education Hunan University Changsha410082 China

Anti-controlling Hopf-Hopf interaction bifurcation on Poincaré map in a three-degree-of-freedom vibratory system with clearance is addressed in this paper. Firstly, a six-dimensional Poincaré map of the vibro-impact system is established. As the analytical expressions of all eigenvalues of Jacobi matrix for six-dimensional map are unavailable, the classical critical criteria of Hopf-Hopf interaction bifurcation described by the properties of eigenvalues have a great limitation in obtaining control gains. Aiming at the limitation, a new bifurcation criterion including eigenvalue assignment, transversality condition and non-resonance condition is established. The established criteria are equivalent to the classical critical criteria, but they do not depend on eigenvalue computations of Jacobi matrix. Then, for the difficulty of implicit Poincaré map created by discontinuity of vibro-impact motions in anti-control design of bifurcation of the close-loop system, a linear feedback control method is developed. Finally, numerical simulation shows that a torus solution of Hopf-Hopf interaction bifurcation on Poincaré map is created in a desired parameter location and verifies theoretical analysis. © 2015, Nanjing University of Aeronautics an Astronautics. All right reserved.

关键词： Eigenvalues and eigenfunctions

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Influence of Blank Holding Force on Stretch Flange Forming of Aluminum Alloy

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Materials Today: Proceedings 2015年第4期2卷 1934-1941页

作者： Yogesh Dewang M.S. Hora S.K. Panthi Research Scholar Department of Mechanical EngineeringMaulana Azad National Institute of Technology Bhopal 462051 India Professor Department of Civil EngineeringMaulana Azad National Institute of Technology Bhopal 462051 India Scientist Computer Simulation & Design CentreAdvanced Materials Processes and Research Institute Bhopal 462064 India

The effect of blank holding force on the stretch flanging process was investigated using finite element simulation and experimental analysis. Finite element model was used to study the effect of blank holding forces on punch load and forming kinematics. An aluminum alloy 5052 sheet of 0.5 mm thickness was employed for this work. Blank holding force has a great effect on punch load and significant influence on forming kinematics. Validation of FEM results were obtained by conducting experiments. A very good agreement was obtained between FEM simulation results in terms of punch load and final shape which shows the accuracy of present finite element model.

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Finite Element Analysis of Non-axisymmetric Stretch Flanging Process for Prediction of Location of Failure

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Procedia Materials Science 2014年 5卷 2054-2062页

作者： Yogesh Dewang M.S. Hora S.K. Panthi Research Scholar Department of Mechanical EngineeringMaulana Azad National Institute of Technology Bhopal462051 India Professor Department of Civil EngineeringMaulana Azad National Institute of Technology Bhopal 462051 India Scientist Computer Simulation & Design CentreAdvanced Materials Processes and Research InstituteBhopal462064 India

Stretch flanging is an important sheet metal forming process which is applied in automotive industry. In this paper, finite element simulation of stretch flanging process of AA 5052 has been carried out. It is found that both punch-die clearance and initial flange length has great effect on strain distribution and edge cracking along die profile radius. A good agreement has been obtained between results of simulation and experimental results, in terms of edge crack, punch load and punch stroke. From this investigation, finite element simulation is found to be quite useful in predicting deformation behavior of stretch flange quite efficiently.

关键词： Stretch Flanging finite element simulation punch-die clearance initial flange length edge crack strain

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