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检索条件"机构=Key Lab of lndustrial Computer Control Engineering of Hebei Province"

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Robust adaptive control for hydraulic servo position system with unmatched uncertainties

Robust adaptive control for hydraulic servo position system ...

引用

Chinese control Conference (CCC)

作者： Ru Chang Yi-Ming Fang Zhi-Jie Wang Hai-Bo Tian Key Lab of Industrial Computer Control Engineering of Hebei Province College of Electric Engineering Yanshan University Qinhuangdao 066004 China

To deal with the problems caused by unmatched uncertainties and external load disturbance exist in mill hydraulic servo position system, a robust adaptive controller design method is presented in this paper. The controller is composed of a state feedback controller and an adaptive compensator, the state feedback controller is obtained by solving a Riccati equation, and the compensator is obtained by estimating the upper bounds of the unknown external disturbances. It is proved that the global asymptotic stability of the resulting closed-loop system can be guaranteed. Finally, simulation results for the mill hydraulic servo position system illustrate the validity of the proposed algorithm.

关键词： Robustness Servomotors Backstepping Adaptive control Uncertainty

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Robust predictive control for a class of uncertain discrete system with multiple state delays

Robust predictive control for a class of uncertain discrete ...

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Chinese control Conference (CCC)

作者： Jun-Cheng Zhao Yi-Ming Fang Jian-Xiong Li Key Lab of Industrial Computer Control Engineering of Hebei Province College of Electric Engineering Yanshan University Qinhuangdao 066004 China

A robust predictive control algorithm based on memory state feedback is proposed for a class of uncertain discrete time system with input constraint and multiple state delays. By introducing Lyapunov-Krasovskii function and using linear matrix inequality (LMI) method, the algorithm can convert the infinite time domain optimization problems into linear programming problems. Sufficient conditions of the existence and explicit expression for the memory state feedback controller are obtained, and the control input can satisfy constraint as well. Asymptotical stability of the closed-loop system and minimum of robust performance index can be guaranteed simultaneously. Finally, the simulation results illustrate the effectiveness of the proposed algorithm.

关键词： Robustness Predictive control Predictive models Delay Mathematical model State feedback Prediction algorithms

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Bearing Condition Monitoring and Fault Diagnosis of a Wind Turbine Using Parameter Free Detection

Bearing Condition Monitoring and Fault Diagnosis of a Wind T...

引用

The 2011 International Conference on Electric and Electronics(EEIC 2011)

作者： Shenggang Yang Xiaoli Li Ming Liang Key Lab of Industrial Computer Control Engineering of Hebei Province Institute of Electrical Engineering Yanshan University Department of Mechanical Engineering University of Ottawa

The most frequently used component of a wind turbine is bearing which failure could lead to malfunction and ultimately complete stall in a mission-critical equipment. Hence, bearing fault detection is an imperative part of preventive maintenance procedures in a wind turbine. This paper presents a free parameter approach to implement bearing condition monitoring and fault diagnosis. This approach extracts the amplitude and frequency modulations of faulty vibration signals that measured from a wind turbine system. The amplitude demodulation is inherent, and the fault frequency will be detected from the spectrums of the signal. The effectiveness of this approach has been validated by using simulated signal and experimental evaluation.

关键词： Bearing Condition Monitoring Fault Detection Wind turbine

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Speed sensorless control for wind turbine systems based on Hamiltonian model observer

Speed sensorless control for wind turbine systems based on H...

引用

作者： Ren, Li-Na Liu, Fu-Cai Jiao, Xiao-Hong Key Lab of Industrial Computer Control Engineering of Hebei Province Yanshan University Qinhuangdao 066004 China

ISBN: (纸本)9789881725592

Aimed at the rotor speed unmeasured, this paper presents a speed sensorless control strategy with observer for permanent magnet wind turbine generator based on port-controlled Hamiltonian (PCH) model. The PCH model is established by taking full advantage of the physics structure of wind turbine system and then the full-order observer is proposed based the PCH model to estimate rotor speed. This structure of controller is simple but also reflecting physical meaning. Moreover, an adaptive controller is investigated under the uncertain parameters and the external disturbance. The proposed strategy is proved valid by the simulation illustration. © 2011 Chinese Assoc of Automati.

关键词： Permanent magnets

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Robust predictive control for a class of uncertain discrete system with multiple state delays

Robust predictive control for a class of uncertain discrete ...

引用

作者： Zhao, Jun-Cheng Fang, Yi-Ming Li, Jian-Xiong Key Lab of Industrial Computer Control Engineering of Hebei Province College of Electric Engineering Yanshan University Qinhuangdao 066004 China

ISBN: (纸本)9789881725592

关键词： Linear matrix inequalities

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Robust adaptive control for hydraulic servo position system with unmatched uncertainties

Robust adaptive control for hydraulic servo position system ...

引用

作者： Chang, Ru Fang, Yi-Ming Wang, Zhi-Jie Tian, Hai-Bo Key Lab of Industrial Computer Control Engineering of Hebei Province College of Electric Engineering Yanshan University Qinhuangdao 066004 China

ISBN: (纸本)9789881725592

关键词： Closed loop systems

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T-S model based fault tree analysis on the hoisting system of rubber-tyred girder hoister

T-S model based fault tree analysis on the hoisting system o...

引用

2010 WASE International Conference on Information engineering, ICIE 2010

作者： Yao, Chengyu Zhang, Yingyi Key Lab of Industrial Computer Control Engineering of Hebei Province Yanshan University Qinhuangdao China

ISBN: (纸本)9780769540801

Hoisting system is the key part of the girder hoister, and its reliability determines the stability and security of the girder hoister directly. Hoisting system consists of mechanical, electrical and hydraulic components. Owing to the multiple and complex failure modes and mechanisms of the components, the hoisting system's reliability evaluation is accomplished by Fault Tree Analysis (FTA) based on T-S model. Failure probabilities can be described as fuzzy possibilities and fault degrees are expressed in terms of fuzzy numbers, while events' relationships are described by T-S gates instead of conventional logic gates. A method to acquire knowledge about the premise and consequent events is given, in terms of fuzzy rules of T-S gates made up of fuzzy possibilities and fault degrees of components. Fuzzy possibilities of the intermediate events and the top event are computed by MATlab, in terms of information about field experiences and expert data. Considering the influence of fault degrees to the system at the same time, it offers reference to find and improve relevant weaknesses of the system, thus the dependability of the whole hoisting system is improved. © 2010 IEEE.

关键词： Fault tree analysis

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Fuzzy adaptive control for multi-machine power system based on ant colony algorithm

Fuzzy adaptive control for multi-machine power system based ...

引用

International Conference on Natural Computation

作者： Wu, Zhong-Qiang Yao, Yuan Dou, Chun-Xia Key Lab of Industrial Computer Control Engineering of Hebei Province Yanshan University Qinhuangdao 066004 China

ISBN: (纸本)9781424459612

Based on multi-machine excitation control models, using fuzzy adaptive theory and considering the muti-machine nonlinear system whose states are not available, observer-based adaptive fuzzy output feed back control schemes are proposed. In this paper, the ant colony algorithm is used to optimize the fuzzy control rules. The simulation result shows that the controller can effectively improve power system stability under big disturbance. © 2010 IEEE.

关键词： Fuzzy control

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A new LMS algorithm with application to fixed satellite communications

A new LMS algorithm with application to fixed satellite comm...

引用

International Workshop on Advanced Computational Intelligence

作者： Li, Haibin Han, Yanguang Guan, Xinping Key Lab. of Industrial Computer Control Engineering Hebei Province Qinhuangdao CO 066004 China

ISBN: (纸本)9781424463343

A distinctive new LMS algorithm is proposed in his paper. Both fast convergence rate and small steady state rror can be obtained through non-linear weighting N errors of the current moment and past moments in this algorithm. The algorithm analyzed that the ideal step size is achieved by increasing the error information, building new nonlinear relations between step size factor and error function and eliminating the effect of correlated noise sequences. Then the new algorithm is applied to the fixed satellite communications system in which the channel is affected by multipath effect and weather conditions attenuation. Simulation results show that the new algorithm converges faster than usual algorithms under approximate steady state performance. The signal BER performance is greatly improved with the new adaptive algorithm equalizer in the fixed satellite communications system.

关键词： Satellite communication systems

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Optimization of schedule with multi-objective for tandem cold rolling mill based on IAGA

Optimization of schedule with multi-objective for tandem col...

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2010 International Conference on Mechanic Automation and control engineering, MACE2010

作者： Che, Haijun Han, Xinyan Yang, Jingming Li, Lianfei Key Lab. of Industrial Computer Control Engineering of Hebei Province Yanshan University Qinhuangdao China

ISBN: (纸本)9781424477388

To tackle the multi-objective problem in the process of tandem cold rolling, a mathematical model of multi-object optimization is presented. Taking equal relatively power and prevent slippage as objective functions. Aiming to the problem of Standard Genetic Algorithm (SGA), such as premature convergence, oscillation and over-randomization in iterative process, an Improved Adaptive Genetic Algorithm (IAGA) is applied to optimize the system. The algorithm decides the crossover rate and mutation rate of chromosome based on individual adaptive value in calculation process, make the start phase mutate obviously and later phase stable slowly and ensure the population development, seeking balance and entire convergence. Simulated results show that, in comparison with the actual rolling schedule, the optimization rolling schedule makes the reasonable distribution of tandem cold rolling power, gives the full play to equipment capacity, reduces the rate of slippage, improves the product quality, and the proposed method is demonstrated to be competent. ©2010 IEEE.

关键词： Multiobjective optimization

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