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Fuzzy dynamic output-feedback control for markov jump fuzzy bilinear system

ICIC Express Letters, Part B: Applications 2015年第10期6卷 2883-2890页

作者： Chang, Ru Fang, Yiming Liu, Le Key Lab of Industrial Computer Control Engineering of Hebei Province College of Electric Engineering Yanshan University China National Engineering Research Center for Equipment and Technology of Cold Strip Rolling No. 438 Hebei Ave QinhuangdaoP.R China

Fuzzy dynamic output-feedback control problem is investigated for a class of fuzzy bilinear systems with Markovian jumping parameters. The transition probability matrix is assumed to be partly unknown. Based on Takagi-Sugeno (T-S) fuzzy bilinear model, a nonlinear dynamic output-feedback controller is first constructed, and in terms of linear matrix inequalities techniques, the sufficient conditions on the stochastic stability of the closed-loop fuzzy bilinear jump system are presented and proved. Finally, a numerical example is provided to illustrate the effectiveness of the proposed method. ©, 2015 ICIC Express Letters *** Rights Reserved.

关键词： Fuzzy control

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control of epileptiform spikes based on nonlinear unscented Kalman filter

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Chinese Physics B 2014年第1期23卷 41-48页

作者：刘仙高庆李小俚 Key Lab of lndustrial Computer Control Engineering of Hebei Province Institute of Electrical Engineering Yanshan University Qinhuangdao 066004 China

A new control strategy based on nonlinear unscented Kalman filter(UKF) is proposed for a neural mass model that serves as a model for simulating real epileptiform stereo-electroencephalographic (SEEG) signals. The UKF is used as an observer to estimate the state from the noisy measurement because it has been proved to be effective for state estimation of nonlinear systems. A UKF controller is constructed via the estimated state and is illustrated to be effective for epileptiform spikes suppression of aforementioned model by numerical simulations.

关键词： unscented Kalman filter(UKF) control epileptiform spike closed-loop control neural mass model

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Hopf bifurcation control for a coupled nonlinear relative rotation system with time-delay feedbacks

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Chinese Physics B 2014年第10期23卷 299-305页

作者：刘爽李雪谈书贤李海滨 Key Laboratory of Industrial Computer Control Engineering of Hebei Province Yanshan University National Engineering Research Center for Equipment and Technology of Cold Strip Rolling Yanshan University

This paper investigates the Hopf bifurcations resulting from time delay in a coupled relative-rotation system with time- delay feedbacks. Firstly, considering external excitation, the dynamical equation of relative rotation nonlinear dynamical system with primary resonance and 1：1 internal resonance under time-delay feedbacks is deduced. Secondly, the averaging equation is obtained by the multiple scales method. The periodic solution in a closed form is presented by a perturbation approach. At last, numerical simulations confirm that time-delay theoretical analyses have influence on the Hopf bifurcation point and the stability of periodic solution.

关键词： relative rotation coupled nonlinear system bifurcation time delay

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Bifurcation and chaos analysis of a nonlinear electromechanical coupling relative rotation system

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Chinese Physics B 2014年第9期23卷 271-277页

作者：刘爽赵双双孙宝平张文明 Key Laboratory of Industrial Computer Control Engineering of Hebei Province Yanshan University National Engineering Research Center for Equipment and Technology of Cold Strip Rolling Yanshan University

Hopf bifurcation and chaos of a nonlinear electromechanical coupling relative rotation system are studied in this paper. Considering the energy in air-gap field of AC motor, the dynamical equation of nonlinear electromechanical coupling relative rotation system is deduced by using the dissipation Lagrange equation. Choosing the electromagnetic stiffness as a bifurcation parameter, the necessary and sufficient conditions of Hopf bifurcation are given, and the bifurcation characteristics are studied. The mechanism and conditions of system parameters for chaotic motions are investigated rigorously based on the Silnikov method, and the homoclinic orbit is found by using the undetermined coefficient method. Therefore, Smale horseshoe chaos occurs when electromagnetic stiffness changes. Numerical simulations are also given, which confirm the analytical results.

关键词： relative rotation electromechanical coupling Hopf bifurcation chaos

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Finite-time neural network adaptive control of under-actuated robots 4

Finite-time neural network adaptive control of under-actuate...

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2014 4th International Conference on Mechanical engineering, Industry and Manufacturing engineering, MEIME 2014

作者： Wu, Zhong Qiang Liu, Li Ling Zhao, Li Ru Key lab of industrial computer control engineering of Hebei province Yanshan University China

ISBN: (纸本)9783038353256

The finite-time neural network adaptive control of under-actuated robot is investigated, and a kind of multistep control strategy is used. First the transformation of dynamics model is made, and the passive joints are driven to desire positions by the coupling among joints, then the passive joints are locked. When the passive joints are locked to other operating point, the system becomes the one with structure uncertain. Combining the theory of finite-time control with neural network adaptive control, a finite-time neural network adaptive controller is got which can make the position tracking of joint rapidly. The simulation shows the effectiveness of the controller. © (2014) Trans Tech Publications, Switzerland.

关键词： Robots

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An equalization algorithm based on constellation matched phase error for M-ary phase shift keying signals

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Journal of Computational Information Systems 2014年第3期10卷 895-902页

作者： Wang, Xinlin Liu, Bin Li, Haibin Liu, Shuang College of Information Science and Engineering Yanshan University Qinhuangdao 066004 China Key Lab. of Industrial Computer Control Engineering of Hebei Province Yanshan University Qinhuangdao 066004 China

The inter-symbol interference (ISI) and phase error caused by non-ideal character of channel can result in severe degradation of bit error rate performance in communication system. The existing equalization algorithm can effectively eliminate the ISI of M-ary phase shift keying signals (MPSK), but do not inhibit the phase error. A new equalization algorithm that accomplishes blind equalization and phase information recovery simultaneously is proposed for MPSK signals. In the algorithm, the cost function is weighted sum of two separate well-defined terms: one is identical to the constant modulus algorithm case to enhance the robust of the algorithm, and another is a constellation matched phase error (CMPE) term that is constructed in this paper. The CMPE term is used to cancel the phase error of the equalizer output. Simulation results demonstrate that the proposed algorithm is effective in removing ISI and correcting phase error at the same time. © 2014 Binary Information Press.

关键词： Phase shift keying

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Optimization of Tandem Cold Rolling Schedule Based on Competitive Coevolution Algorithm 33

Optimization of Tandem Cold Rolling Schedule Based on Compet...

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第三十三届中国控制会议

作者： ZHAO Xinqiu MENG Qinggang CHE Haijun YANG Jingming National Engineering Research Center for Equipment and Technology of Cold Strip Rolling Key Lab of Industrial Computer Control Engineering of Hebei Province Yanshan University

ISBN: (纸本)9781479947249

The schedule set is an important part in the cold rolling process, which directly affects product quality and production efficiency in the production of steel rolling. Due to the low precision of traditional rolling force model, a model of rolling force was founded by the least squares support vector machine(LSSVM) method though analyzing the influencing factors of rolling force. Considering the diversity of optimization goal on rolling schedule of cold tandem rolling, the rolling schedule was optimized by competitive coevolution algorithm(Comp-CEA). A rolling schedule of steel cold rolling mill in Tangshan was optimized by selecting the power distribution, excellent flatness and the slip rate as objective functions. The experiment results show that Comp-CEA has the advantages such as high accuracy, rapid convergence and so on, and three objective functions can be improved in varying degrees.

关键词： Comp-CEA LSSVM,tandem cold rolling,rolling schedule

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Backstepping sliding mode control for electro-hydraulic servo system with input saturation via an extended state observer

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Journal of Computational Information Systems 2014年第5期10卷 1955-1963页

作者： Shi, Shengli Li, Jianxiong Li, Yehong Fang, Yiming Key Laboratory of Industrial Computer Control Engineering of Hebei Province Yanshan University Qinhuangdao 066004 China College of Science Yanshan University Qinhuangdao 066004 China

The position tracking control scheme is investigated in this paper for electro-hydraulic servo system with parameter uncertainties and external disturbances. First, the total uncertainty is estimated via an extended state observer, and backstepping sliding mode control law based on the extended state is designed to ensure the system output track the reference signal. Then the control strategy for electro-hydraulic servo system subjected to input saturation is further considered. The extended state observer technique is applied to compensate the effects of the compound uncertainty, which contains not only the parameter uncertainties and external disturbances, but also the unknown input saturation. With the proposed method, the stability of the resulting closed-loop system is proven and the tracking errors converge to a small neighborhood of zero. Finally, simulation results are presented to verify the effectiveness of the proposed tracking control strategies. © 2014 Binary Information Press.

关键词： Backstepping

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A double-loop structure in the adaptive generalized predictive control algorithm for control of robot end-point contact force

A double-loop structure in the adaptive generalized predicti...

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作者： Wen, Shuhuan Zhu, Jinghai Li, Xiaoli Chen, Shengyong Key Lab of Industrial Computer Control Engineering of Hebei Province Yanshan University Qinhuangdao066004 China College of Computer Science Zhejiang University of Technology Hangzhou310023 China

Robot force control is an essential issue in robotic intelligence. There is much high uncertainty when robot end-effector contacts with the environment. Because of the environment stiffness effects on the system of the robot end-effector contact with environment, the adaptive generalized predictive control algorithm based on quantitative feedback theory is designed for robot end-point contact force system. The controller of the internal loop is designed on the foundation of QFT to control the uncertainty of the system. An adaptive GPC algorithm is used to design external loop controller to improve the performance and the robustness of the system. Two closed loops used in the design approach realize the systems performance and improve the robustness. The simulation results show that the algorithm of the robot end-effector contacting force control system is effective. © 2014 ISA. Published by Elsevier Ltd. All rights reserved.

关键词： Point contacts

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An improved method for MRAC system of indirectly designed

An improved method for MRAC system of indirectly designed

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2012 International Conference on Cybernetics and Informatics, ICCI 2012

作者： Huishan, Han Yan, Liu Defang, Cheng Xue, Gao Xingtai Polytechnic College Xingtai054000 China Key Lab of Industrial Computer Control Engineering of Hebei Province Yanshan University Qinhuangdao066004 China

Based on Lyapunov stability theorem, a MRAC system was researched to solve that differential value of plant output is unknown. Meanwhile an improved design for MRAC system aimed on the factor of restricting convergence of system is given. The method not only solves the problem that makes the system cannot work well as a result of the adjustable parameters, but also improves the convergence of plant. The simulation graphs have shown that the plant can follow the output of the reference model quit well. © Springer Science+Business Media New York 2014.

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