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2012 9th IEEE International Conference on Mechatronics and Automation, ICMA 2012

作者： Chen, Jinxiang Zhang, Yungui Yu, Liye State Key Laboratory of Hybrid Process Industry Automation System and Equipment Technology Automation Research and Design Institute of Metallurgical Industry China Iron and Steel Research Institute Group Beijing 100081 China

ISBN: (纸本)9781467312776

This paper investigates the problem of fuzzy state feedback control for looper and tension control systems in hot rolling mills via a linear matrix inequality (LMI) approach. The considered system is approximated by a discrete-time looper and tension control system model. Based on a spectral norm approach, we design a fuzzy state feedback controller which makes the closed-loop system is asymptotically stable. In contrast to the existing results, the proposed approach has two advantages: i). Transition time is short. ii). The strip tension is less affected by the change of looper angel, such that good control performance can be obtained. iii) Simulation results show that the presented method can effectively overcome external disturbances. Moreover, this control scheme is easy to implement, and can be applied to other linear systems. A simulation example with practical parameters is provided to illustrate the effectiveness of the developed method. © 2012 IEEE.

关键词： Fuzzy control

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Dynamic model for quadrupole six-phase electrical excitation synchronous wind power system

Dynamic model for quadrupole six-phase electrical excitation...

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9th IET International Conference on Advances in Power system Control, Operation and Management, APSCOM 2012

作者： Yi, Yuanrui Wang, Cong Wang, Qianggang Zhao, Xia Yan, Wei Gao, Qiang State Key Laboratory of Power Transmission Equipment and System Security and New Technology Chongqing University Chongqing 400030 China Sichuan Electric Power Design and Consulting Co.Ltd. Chengdu 610016 Sichuan Province China

ISBN: (纸本)9781849197434

This paper presents a dynamic model for quadrupole six-phase electrical excitation synchronous wind power system. Capacitor charge-discharge process is taken into consideration, as well as transmission chain speed conversion and generator electromagnetic transformation. Based on PI control principle, controllers dynamic model is established to keep DC voltage constant and realize the maximum power point tracking (MPPT) and unity power factor output. And then, the circuit model is built with Matlab/Simulink. On the basis of the least square method, the relationship between uncontrollable rectifier reactive consumption (Qr) and active output (Pr) is fitted. Finally, a grid-connected WTG operation performance is studied and compared with circuit model simulation, which verify the validity of the proposed model.

关键词： Synchronous generators

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Dynamic model for quadrupole six-phase electrical excitation synchronous wind power system

Dynamic model for quadrupole six-phase electrical excitation...

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9th IET International Conference on Advances in Power system Control, Operation and Management (APSCOM 2012)

作者： Yuanrui Yi Cong Wang Qianggang Wang Xia Zhao Wei Yan Qiang Gao State Key Laboratory of Power Transmission Equipment & System Security and New Technology Chongqing University 400030 China Sichuan Electric Power Design and Consulting Co.Ltd. Chengdu 610016 China

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Research on fractional order controller based on best rational approximation approach

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Journal of Convergence Information technology 2012年第4期7卷 50-58页

作者： Zhao, Huimin Nie, Bing Li, Wen Deng, Wu Software Institute Dalian Jiaotong University Dalian 116028 China Key Laboratory of Numerical Simulation in the Sichuan Provincial College Neijiang Normal University Neijiang 641112 China Artificial Intelligence Key Laboratory of Sichuan Province Sichuan University of Science and Engineering Zigong 643000 China State Key Laboratory of Power Transmission Equipment and System Security and New Technology College of Electrical Engineering Chongqing University Chongqing 400044 China Key Laboratory of advanced Design and Intelligent Computing Dalian University Ministry of Education Dalian 116622 China

Introduce the basic concept of best rational approximation and constructing procedure of the best rational approximation function in Laplace domain. By an illustrative example the design method of FOC based on best rational approximation is discussed. The performance comparison of transfer functions between the FOC obtained by best rational approximation method and conventional PID shows that it is effective to apply the method in design of FOC, which can guarantee maximum absolute error of amplitude frequency characteristic of approximation function in a given error tolerance.

关键词： Rational functions

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Strength analysis for pre-stressed bolted joints of turntable bearings

Strength analysis for pre-stressed bolted joints of turntabl...

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2011 International Conference on Electronic and Mechanical Engineering and Information technology, EMEIT 2011

作者： Xu, Weiwei Liu, Hongbin Xue, Yujun Li, Jishun School of Mechatronics Engineering Henan University of Science and Technology Luoyang 471003 China Henan Key Laboratory for Machinery Design and Transmission System Henan University of Science and Technology Luoyang 471003 China State Key Laboratory of Mining Heavy Equipment Luoyang 471039 China

ISBN: (纸本)9781612840857

This paper describes a calculation model for pre-stressed bolted joints used to connect turntable bearing to the flanges. A traditional pre-stressed bolted joint calculation model is described and its insufficiencies for the direct application on turntable bearings are pointed out. The suggested stress analysis is done by modeling the most loaded single bolt segment of the turntable bearing assembly, applying the preload and the working load on it. The alternating stress in the bolt is done by finite element analysis. The results show that the alternating load of the bolt is significantly decreased and is lower than the fatigue limit of the bolt under the condition of the larger tightening force. Therefore, it should be possible to increase the preload in the conditions that the maximum stress of bolt is below its yield limit stress situation. © 2011 IEEE.

关键词： Stress analysis

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PERSPECTIVES IN MECHANICS OF HETEROGENEOUS SOLIDS

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Acta Mechanica Solida Sinica 2011年第1期24卷 1-26页

作者： C.Q. Chen J.Z. Cui H.L. Duan X.Q. Feng L.H. He G.K. Hu M.J. Huang Y.Z. Huo B.H. Ji B. Liu X.H. Peng H.J. Shi Q.P. Sun J.X. Wang Y.S. Wang H.P. Zhao Y.P. Zhao Q.S. Zheng W.N. Zou Department of Engineering Mechanics AML Tsinghua University Beijing 100084 China Academy of Mathematics and Systems Sciences Chinese Academy of Sciences Beijing 100190 China State Key Laboratory for Turbulence and Complex System and Department of Mechanics and Aerospace Engineering College of Engineering Peking University Beijing 100871 China CAS Key Laboratory of Mechanical Behavior and Design of Materials University of Science and Technology of China Hefei Anhui 230026 China School of Aerospace Engineering Beijing Institute of Technology Beijing 100081 China Institute for Advanced Study Nanchang University Nanchang 330031 China Depariment of Mechanics and Engineering Sciences Fudan University 220 Handa Road Shanghai 200433 China Department of Mechanical Engineering Hong Kong University of Science and Technology Hong KongChina Department of Mechanical Engineering Hong Kong University of Science and Technology Hong Kong China Institute of Engineering Mechanics Beijing Jiaotong University Beijing 100044 China State Key Laboratory of Nonlinear Mechanics Institute of Mechanics Chinese Academy of Sciences Beijing 100190 China

The Micro- and Nano-mechanics Working Group of the Chinese Society of Theoretical and Applied Mechanics organized a forum to discuss the perspectives, trends, and directions in mechanics of heterogeneous materials in January 2010. The international journal, Acta Mechanica Solida Sinica, is de- voted to all fields of solid mechanics and relevant disciplines in science, technology, and engineering, with a balanced coverage on analytical, experimental, numerical and applied investigations. On the occasion of the 30TM anniversary of Acta Mechanica Solida Sinica, its editor-in-chief, Professor Q.S. Zheng invited some of the forum participants to review the state-of-the-art of mechanics of heterogeneous solids, with a particular emphasis on the recent research development results of Chinese scientists. Their reviews are organized into five research areas as reported in different sections of this paper. ~I firstly brings in fo- cus on micro- and nano-mechanics, with regards to several selective topics, including multiscale coupled models and computational methods, nanocrystal superlattices, surface effects, micromechanical damage mechanics, and microstructural evolution of metals and shape memory alloys. ~II shows discussions on multifield coupled mechanical phenomena, e.g., multi-fields actuations of liquid crystal polymer networks, mechanical behavior of materials under radiations, and micromechanics of heterogeneous materials. In ~III, we mainly address the multiscale mechanics of biological nanocomposites, biological adhesive surface mechanics, wetting and dewetting phenomena on microstructured solid surfaces. The phononic crystals and manipulation of elastic waves were elaborated in ~IV. Finally, we conclude with a series of perspectives on solid mechanics. This review will set a primary goal of future science research and engineering application on solid mechanics with the effort of social and economic development.

关键词： heterogeneous materials smart materials biological materials multiscale mechanics micro- and nano-mechanics damage and fracture constitutive relation elastic wave surface effects

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Fuzzy H∞ filtering for nonlinear singularly perturbed systems with time-varying delay

Fuzzy H∞ filtering for nonlinear singularly perturbed syste...

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2011 8th International Conference on Fuzzy systems and Knowledge Discovery, FSKD 2011, Jointly with the 2011 7th International Conference on Natural Computation, ICNC'11

作者： Li, Yaping Chen, Jinxiang Meng, Lixia He, Meiyun Beijing Information Technology College Beijing 100015 China State Key Laboratory of Hybrid Process Industry Automation System and Equipment Technology Automation Research and Design Institute of Metallurgical Industry 100071 China Department of Computer Science and Technology Tsinghua University Army Aviation College Beijing 100084 China Department of Mechanism Army Aviation College Beijing 100123 China

ISBN: (纸本)9781612841816

This paper investigates the problem of designing fuzzy H∞ filter for a class of nonlinear singularly perturbed systems (SPSs) with time-varying delay in states. The considered system is approximated by a Takagi-Sugeno (T-S) fuzzy model. By using linear matrix inequality (LMI) methods, we give a -independent sufficient condition for the existence of fuzzy H∞ filter such that, the resulting filtering error system is globally stable with guaranteed H∞ performance for sufficiently small . The gains of filter are obtained by solving a set of -independent LMIs, and therefore the ill-conditioned problem caused by can be easily avoid. The proposed method can be applied to both standard and nonstandard nonlinear SPSs. A numerical example is provided to illustrate the effectiveness of the developed method. © 2011 IEEE.

关键词： Perturbation techniques

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On Energy-Efficient Trap Coverage in Wireless Sensor Networks

On Energy-Efficient Trap Coverage in Wireless Sensor Network...

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Real-Time systems Symposium (RTSS)

作者： Junkun Li Jiming Chen Shibo He Tian He Yu Gu Youxian Sun State Key Laboratory of Industrial Control Technology Zhejiang University China Computer Science and Engineering University of Minnesota USA Pillar of Information System Technology and Design Singapore University of Technology and Design Singapore

In wireless sensor networks (WSNs), trap coverage has recently been proposed to tradeoff between the availability of sensor nodes and sensing performance. It offers an efficient framework to tackle the challenge of limited resources in large scale sensor networks. Currently, existing works only studied the theoretical foundation of how to decide the deployment density of sensors to ensure the desired degree of trap coverage. However, the practical issues such as how to efficiently schedule sensor node to guarantee trap coverage under an arbitrary deployment is still left untouched. In this paper, we formally formulate the Minimum Weight Trap Cover Problem and prove it is an NP-hard problem. To solve the problem, we introduce a bounded approximation algorithm, called Trap Cover Optimization (TCO) to schedule the activation of sensors while satisfying specified trap coverage requirement. The performance of Minimum Weight Trap Coverage we find is proved to be at most O(ρ) times of the optimal solution, where ρ is the density of sensor nodes in the region. To evaluate our design, we perform extensive simulations to demonstrate the effectiveness of our proposed algorithm and show that our algorithm achieves at least 14% better energy efficiency than the state-of-the-art solution.

关键词： Sensors Wireless sensor networks Approximation algorithms Algorithm design and analysis Approximation methods Euclidean distance Optimization

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Numerical Study of a Dielectrophoresis Separation Device at Multiple Frequencies

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Procedia Engineering 2011年 15卷 341-345页

作者： Baoyu Song Deli Liu Lining Sun Liguo Chen Department of Mechanical Design Harbin Institute of Technology Harbin 150001 China State Key Laboratory of Robotics and System Harbin Institute of Technology Harbin 150080 China Robotics and Microsystems Center Soochow University Suzhou 215021 China

This paper presents a novel dielectrophoresis (DEP) chip for lateral separation of cells/particles at multiple frequencies. DEP force was enabled by interdigitated electrodes fabricated in the access channel. The non-uniform electric field distribution in the micro-channel is solved through finite element analysis. To improve the effectiveness of separation, the shape of insulators is optimized and other parameters such as the width of the electrodes are studied by introducing parameter K which can stand for the DEP force imposed on cells/particles. It is proved that planar electrodes can take place of 3D electrodes under certain condition. Furthermore functions realized by 3D electrodes can also be achieved by simple planar electrodes.

关键词： Lab-On-Chip Dielectrophoresis Particle focusing

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The uncertainty optimization of vehicle occupant restraint system based on interval number programming

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Qiche Gongcheng/Automotive Engineering 2011年第1期33卷 6-10页

作者： Li, Fangyi Li, Guangyao Zhang, Jiahong Sun, Guangyong Zhang, Zheng School of Automotive and Mechanical Engineering Changsha University of Science and Technology Changsha 410114 China Hunan University State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body Changsha 410082 China Autoliv Vehicle Safety System Technical Center Co. Ltd Shanghai 201807 China

The uncertainty optimization of vehicle occupant restraint system is studied in this paper based on interval number programming. Firstly a simulation model for occupant restraint system is set up using MADYMO software with the model verified by tests. Then, a weighted injury criterion is taken as objective, and the stiffness and upper anchor position of seat belt, as well as the tearing force and stretch length of force limiter etc are selected as design variables with the stiffnesses of seat and knee bolster as uncertain variables, and the uncertainty optimization is transformed into certainty optimization by using interval number programming. Next, the surrogate models for objective and constraint functions are built with Latin hypercube experiment design, and by utilizing sequential quadratic programming and genetic algorithms as the solvers for inner and outer layers respectively, an optimization is performed. Finally the approximately optimum solutions of the parameters of occupant restraint system are obtained.

关键词： Stiffness

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