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2011 International Conference on Future Wireless Networks and Information systems, ICFWI 2011

作者： Ma, You-Jie Jia, Li-Ying Zhou, Xue-Song Li, Ji Li, Xiao-Shuang Liu, Si-Jia Dept. of Electrical Engineering Tianjin University of Technology Tianjin Key Laboratory for Control Theory and Applications in Complicated Systems Tianjin China

ISBN: (纸本)9783642273254

The problem of determining the Hopf bifurcation point in an autonomous nonlinear system with bifurcation parameters is converted into solve a set of nonlinear algebraic equations , which can be constructed by a semi-analytical method and solved by an iterative numerical algorithm as proposed, according to the necessary and sufficient conditions for existing of Hopf bifurcation. First of all, the eigen-polynomial of Jacobian matrix of the system can be decomposed into product of two parts under the condition for existing of Hopf bifurcation. And then, the coefficients of the eigen-polynomial can be decided though the semi-analytical method by using the relations of the coefficients and the elements of Jacobian matrix, and deducing the conditions which should be decided by the coefficients at Hopf bifurcation point. The nonlinear equation set is constructed through the above condition and the one that Hopf bifurcation point must be the balance point of the system. The nonlinear equation set is constructed through the above condition and the one that Hopf bifurcation point must be the balance point of the system. And last, the nonlinear equation set is solved by using Newton2Raphson iterative method. The proposed method can determine both Hopf bifurcation point and the pure imaginary eigenvalue pair of the Jacobin matrix of the system at the same time, thus avoiding the shortcoming for repeatedly solving the eigenvalue problems for every change of the chosen parameters as in some other existing methods. The proposed method is feasible and effective which is illustrated in General Electric Power systems. © Springer-Verlag 2012.

关键词： Iterative methods

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Adaptive control of chaos in permanent magnet synchronous motor using the passive equivalence technique

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Journal of Computational Information systems 2012年第5期8卷 2091-2098页

作者： Li, Dexiong Qi, Huijuan Ma, Yajun Jin, Huichao Luo, Yuzhu Shijiazhuang Institute of Railway Technology Shijiazhuang 050041 China Tianjin Key Laboratory for Control Theory and Applications in Complicated Systems Tianjin University of Technology Tianjin 300384 China

Recent studies have shown that permanent magnet synchronous motor (PMSM) is a highly nonlinear system, and can exhibit chaotic behaviors when its systemic parameters fall into a certain area which severely threatens the secure and the stable operation of the motor-driven system. To control the undesired chaotic phenomenon in PMSM, an adaptive controller is designed based on the passive control technique. By means of the properties of a passive system, it derives the essential conditions which chaotic behaviors in PMSM could be equivalent to a passive system and proved that the equivalent system can be asymptotically stabilized at an equilibrium point via smooth state feedback. Taking into account the uncertainty of systemic parameters, an adaptive control law is introduced into the presented controller. Both theoretical and numerical simulation results are shown the effectiveness of the proposed method. © 2012 Binary Information Press.

关键词： Chaos control

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Study and simulation of switched reluctance drive multifunctional integration control system

Study and simulation of switched reluctance drive multifunct...

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International Conference on Consumer Electronics, Communications and Networks

作者： Ying Zhao Yaru Liu Dept. of Electrical Engineering Tianjin Key Laboratory for Control Theory & Applications in Complicated Systems Tianjin University of Technology Tianjin China

SRD has better application in future. We used SRD into hybrid electric vehicle and study integration of starting, running, steering and charging. A 6/4 SRD simulation model can be built by Matlab/Simulink. The characteristics of all stages of the vehicle are described well from this model and also proved the possibility of the control method.

关键词： Torque Reluctance motors Mathematical model control systems Batteries Vehicles Rotors

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Numerical Simulation of Casting Filling Process Based on FLUENT

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Energy Procedia 2012年 17卷 1864-1871页

作者： Xuan-xuan Yuwen Ling Chen Yi-jie Han Tianjin Key Laboratory for Control Theory & Applications in Complicated Systems Tianjin University of Technology Tianjin 300384 China School of Mechanical Engineering Tianjin University of Technology Tianjin 300384 China School of Foreign Languages Renmin University of China Beijing100872 China

Based on finite element theory, using FLUENT software and three-dimensional model to simulate liquid metal free surface and temperature field of casting filling process numerically. Boundary and initial conditions, such as velocity, pressure, temperature, etc., was reasonably set. The feasibility of using FLUENT to simulate three-dimensional casting was studied; the fluctuation of molten metal free surface was observed; the temperature distribution data on the end of filling was recorded, for further numerical simulation of casting solidification process which provided an accurate initial condition. This paper also predicted defects on casting filling process, and provided a basis for process optimization.

关键词： Mold Filling Simulation FLUENT Free Surface Temperature Field

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Research on the BOF steelmaking endpoint temperature prediction

Research on the BOF steelmaking endpoint temperature predict...

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2011 International Conference on Mechatronic Science, Electric Engineering and Computer, MEC 2011

作者： Cai, Bing-Yao Zhao, Hui Yue, You-Jun Tianjin Key Laboratory for Control Theory and Applications in Complicated System Tianjin University of Technology Tianjin China

ISBN: (纸本)9781612847221

One aim of basic oxygen furnace (BOF) steelmaking endpoint control is the temperature control. For the majority of the china's small or medium BOF, sublance can not be used as a result of restrictions of production conditions, so, researching the BOF endpoint control without sublance has a significant application value. For the data's characteristics of nonlinearity and high noises in the field, a new algorithm combining the DBSCAN clustering algorithm with the RBF neural network algorithm was proposed. It was used to achieve effective treatment of the noises, furthermore, it will be applied to the prediction of endpoint temperature of BOF steelmaking. Simulation results show that the RBF neural network with DBSCAN has more advantages than the original RBF neural network in dealing with sample sets of high noises. The new RBF neural network has a higher hit rate, which improved the versatility and practicality of RBF neural network. © 2011 IEEE.

关键词： Radial basis function networks

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controlling chaos in power system based on finite-time stability theory

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Chinese Physics B 2011年第12期20卷 101-108页

作者：赵辉马亚军刘思佳高士根钟丹 Tianjin Key Laboratory for Control Theory and Applications in Complicated Systems Tianjin University of Technology School of Electronic and Information Engineering Beijing Jiaotong University School of Electrical Engineering and Automation Tianjin University

Recent investigations show that a power system is a highly nonlinear system and can exhibit chaotic behaviour leading to a voltage collapse, which severely threatens the secure and stable operation of the power system. Based on the finite-time stability theory, two control strategies are presented to achieve finite-time chaos control. In addition, the problem of how to stabilize an unstable nonzero equilibrium point in a finite time is solved by coordinate transformation for the first time. Numerical simulations are presented to demonstrate the effectiveness and the robustness of the proposed scheme. The research in this paper may help to maintain the secure operation of power systems.

关键词： power system chaos control finite-time stability stabilize unstable nonzero equilibrium point robust controller

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Study of 3-RRRU parallel manipulator for its dynamics based on method Kane

Study of 3-RRRU parallel manipulator for its dynamics based ...

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International Conference on Measuring Technology and Mechatronics Automation

作者： Wang, Lihua Zhao, Xinhua Meng, Guangzhu Tianjin Key Laboratory for Control Theory and Applications in Complicated System Tianjin University of Technology Tianjin 300384 China

ISBN: (纸本)9780769542966

Focused on 3-RRRU parallel manipulator, this paper sets up its kinematic modeling through vector analysis. Then, velocity, angular velocity, partial velocity, partial angular velocity, acceleration, and angular acceleration are presented for every bar in every leg. Further, dynamic modeling of 3-RRRU parallel manipulator is established and analyzed under appropriate generalized coordinates. Finally, a numerical simulation example is given. © 2011 IEEE.

关键词： Angular velocity

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Research and Improvement of Deficit Round Robin Algorithm Based on CAN Bus

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International Conference on Computational Materials Science (CMS 2011)

作者： Chen Zaiping Guo Yanlei Key Laboratory for Control Theory and Applications in Complicated Systems School Tianjin University of Technology

ISBN: (纸本)9783037851555

The data transmission on CAN bus is decided by priority, That is the data with high priority can always be transmited by inturrupt the data transmission with low priority In that case the data with lower priority may not be transmitted for a long time. To sove such problem we use DRR scheduling algorithm,But in the case of too many unexpected data,The scheduling results are poor In view of such situation this paper put forward a solution allocation quotas dynamicly according to the current network state. And setting up a CAN bus system simulation platform in which conducted a simuliation experiment. The result show that the improvement strategy work well at any situation.

关键词： CAN bus data transmission DRR scheduling algorithm unexpected data

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Implementation of management model for manufacturing information based to PDM

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key Engineering Materials 2011年 458卷 258-264页

作者： Hu, Yahui Hu, Xiaomin Zheng, Qingchun Lv, Huijvan School of Mechanical Engineering Tianjin University Tianjin 300072 China Tianjin Key Laboratory for Control Theory and Applications in Complicated Systems Tianjin University of Technology Tianjin 300384 China

Product development is becoming more complex. Product design is desired to be undertaken together with the considerations of downstream processes such as manufacturing and assembling. The product data exchange between CAD and PDM systems is a crucial issue for the integration of product development systems. To solve this, this paper focuses on a flexible, unified data model based on PDM that integrates information and models from different engineering domains. Some key technologies, such as type of data organization and data exchange between PDM and CAD, are researched based on the case of Smarteam. This approach has been experimented within a company environment that designs and produces families of the hydraulic press parts. © 2011 Trans Tech Publications, Switzerland.

关键词： Electronic data interchange

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Design of a New Multifunctional Wheelchair-bed

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Chinese Journal of Biomedical Engineering(English Edition) 2012年第4期21卷 165-170页

作者： LI Feng ZHANG Chun-qiu LIU Hai-ying GAO Li-lan YE Jin-duo XIN Dong Institute of Mechanical Engineering Tianjin University of Technology Tianjin Key Laboratory for Control Theory & Applications in Complicated Industry Systems Department of Mechanics College of Mechanical Science and Engineering Nanling Campus Jilin University

Currently, the aging of the population has become the world＇s social problem. With the increase of aging population and lots of disability, paralysis makes nursing care more difficult. Because of many elderly cannot get timely care, the phenomenon that the elderly have chronic diseases has become more and more serious. It is important to research and develop a new product which can help the elderly and the disabled for improving the quality of their life. This paper suggests a new type of mnltifunctional self-caring wheelchair-bed, which is combined with a wheelchair and a bed. The bed can realize the free conversion among user sitting, leg lifting and lying down, and also can implement the function of turning on sides. Particularly, the wheelchair can be easily separated from the bed and combined, so that patients and the elderly can move freely using it, and even it can be transformed into a standing type to satisfy the patient＇s standing demand, and to a certain extent, carry out the purpose of rehabilitation.

关键词： wheelchair-bed multifunctional rehabilitation design nursing care

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