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6th IFAC Symposium on Mechatronic Systems, MECH 2013

作者： Chen, Dongning Yao, Chengyu Feng, Zhongkui Hebei Provincial Key Laboratory of Heavy Machinery Fluid Power Transmission and Control Yanshan University Qinhuangdao China Key Laboratory of Advanced Forging and Stamping Technology and Science Yanshan University Ministry of Education of China Qinhuangdao China Key Laboratory of Industrial Computer Control Engineering of Hebei Province Yanshan University Qinhuangdao China

ISBN: (纸本)9783902823311

The hydraulic system's reliability is a key factor to ensure the reliable operation of equipment and it is very important to evaluate reliability of hydraulic system. The paper describes a reliability prediction method that may be used to evaluate the reliability of hydraulic systems for industrial applications. The proposed method takes advantage of fuzzy set theory. The aim of this method is to minimize the deficiencies of the traditional reliability prediction methods treating a failure rate as fixed value due to insufficiency practice data. Triangular fuzzy number and Gaussian fuzzy number are used in the application of this prediction method, where environmental factor, derating factor, and other factors are considered. Finally, an example of type crane's hydraulic system is given to verify the feasibility and practicability of the method. © 2013 IFAC.

关键词： Fuzzy set theory

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Reliability optimization of multi-state hydraulic system based on T-S fault tree and extended PSO algorithm

Reliability optimization of multi-state hydraulic system bas...

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6th IFAC Symposium on Mechatronic Systems, MECH 2013

作者： Yao, Chengyu Wang, Bin Chen, Dongning Key Laboratory of Industrial Computer Control Engineering of Hebei Province Yanshan University Qinhuangdao China Hebei Provincial Key Laboratory of Heavy Machinery Fluid Power Transmission and Control Yanshan University Qinhuangdao China Key Laboratory of Advanced Forging and Stamping Technology and Science Yanshan University Ministry of Education of China Qinhuangdao China

ISBN: (纸本)9783902823311

In order to overcome the difficulty of constructing the multi-state system's reliability optimization model, and the shortage of premature convergence of PSO (Particle Swarm Optimization) algorithm, a new reliability optimization method based on T-S fault tree and EPSO (Extended PSO) algorithm is proposed. According to the T-S fault tree and T-S rules of the events, the multi-state system reliability optimization model is constructed, at the same time, given constraint conditions on the system cost, weight and volume, and combined with the death penalty to construct the fitness function. Furthermore, EPSO algorithm based on the attraction and repulsion forces in the artificial physics is applied to the reliability optimization of multi-state hydraulic system. Comparing with PSO algorithm, the results of EPSO algorithm are in a better performance in obtaining global optimal solution. © 2013 IFAC.

关键词： Trees (mathematics)

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Global dynamic sliding mode control of PMSM speed servo systems base on extended state observer

Global dynamic sliding mode control of PMSM speed servo syst...

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Chinese control Conference (CCC)

作者： Yangyang Wu Yiming Fang Le Liu Yongchao Zhang Key Lab of Industrial Computer Control Engineering of Hebei Province Yanshan University Qinhuangdao 066004 China

Base on the the high performance requirements of permanent magnet synchronous motor(PMSM) speed servo system for non-sinusoidal oscillation control system of continuous casting mold, a global dynamic sliding mode(GDSM) control method is proposed, The reaching law of the sliding mode is designed by exponential fast terminal sliding mode(EFTSM) method and the controllers could effectively diminish chattering by designing the first derivative of control output which contains discontinuous function of sliding mode control; Considers the time variation of parameters perturbation and load disturbance of PMSM, a extended state observer (ESO) is constructed to observe the dynamic observation of total system perturbation and conduct feedforward compensation; theoretical analysis shows that the closed-loop system is global bounded stability; The simulated results show that the static and dynamic performance of the PMSM speed servo control system can be significantly improved by using the proposed method.

关键词： Electronic mail Sliding mode control Servomotors Observers Zirconium Digital control Educational institutions

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Analysis of NMPC algorithm based on reduced precision solution criteria

Analysis of NMPC algorithm based on reduced precision soluti...

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2013 2nd International Conference on Manufacturing engineering and Process, ICMEP 2013

作者： Wan, Jiao Na Zhang, Ju Wen Wang, Zhi Qiang Zhang, Tie Jun Wang, Ke Xin Research Institute of Highway Ministry of Transport Beijing 100088 China Institute of applied mathematics Hebei academy of sciences Shijiazhuang 050081 China State Key Lab. of Industrial Control Technology Institute of Industrial Control Department of Control Science and Engineering Zhejiang University Hangzhou 310027 China

ISBN: (纸本)9783037857076

This paper studies the stability of nonlinear model predictive control (NMPC) based on sub-optimal solution obtained under reduced precision solution (RPS) criteria. NMPC needs to solve the optimal control problem (OCP) quickly and the input is injected into the controlled plant in time. Traditional convergence criteria in optimization algorithms usually cost excessive long computation time with little improvement of solution, which results in degradation of control performance eventually. RPS criteria are new convergence criteria for deciding whether the current iterate is good enough and whether the optimization procedure should be terminated. It can terminate the optimization process timely. This work gives the proof of the rps-NMPC's property. Simulations are done to analyze the effect of disturbance, especially when computational delay exists, on the closed-loop system controlled by rps-NMPC, and demonstrate that the algorithm owns good stability when disturbance exists. © (2013) Trans Tech Publications, Switzerland.

关键词： Closed loop systems

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Tension control study in the finishing mill of aluminum hot rolling mills based on PSO+CMAC

Tension control study in the finishing mill of aluminum hot ...

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2013 3rd International Conference on Advanced Measurement and Test, AMT 2013

作者： Yang, Jing-Ming Chen, Li Wan-Hong, Wang Che, Hai-Jun Key Lab of Industrial Computer Control Engineering of Hebei Province Yanshan University Qinhuangdao 066004 China National Engineering Research Center for Equipment and Technology of C.S.R Yanshan University Qinhuangdao 066004 China Henan Mingtai Al. Industrial Co. Ltd of Gongyi Henan Province 451200 China

ISBN: (纸本)9783037857168

Aimed at decreasing the tension variation during transforming process of "1+4" aluminum hot rolling mills unit in one factory of Henan, we analyzed the factors affecting tension variation and improved the tension formula of hot rolling mills process considering the influence of tension on forward slip value. The tension forming process of hot rolling mills from stand 1 to stand 4 is simulated, and the tension structure diagrams of the four-stands are constructed. Due to nonlinear characteristics of the aluminum hot rolling mills tension system, conventional PID controller could not meet the requirement of the system. So we proposed the mixed control of Cerebellar Model Articulation controller (CMAC) coupled with PID to solve the problem of online parameters control and we used Particle Swarm Optimization (PSO) algorithm to optimize PID controller parameters. By simulation, it could be found that the using of PSO+CMAC significantly reduced surplus adjustment and transition time, and strip tension coupling degree among stands was also reduced. © (2013) Trans Tech Publications, Switzerland.

关键词： Aluminum

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Optimal energy consumption scheduling based on Real-Time Pricing in Smart Grid

Optimal energy consumption scheduling based on Real-Time Pri...

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Chinese control Conference (CCC)

作者： Kai Ma Ting Yao Juhai Ma Xinping Guan Key Laboratory of Industrial Computer Control Engineering of Hebei Province Yanshan University Qinhuangdao Hebei CN School of Electronic Information and Electrical Engineering Shanghai Jiao Tong University Shanghai China Key Laboratory of Industrial Computer Control Engineering of Hebei Province Yanshan University Qinhuangdao China

This paper is concerned with the demand side management problem in smart grid, where consumers are served by multiple energy providers. In order to match with the supply, we propose a Real-Time Pricing (RTP)-based energy consumption scheduling scheme, which consists of energy consumption allocation, energy provider selection and real-time pricing. Specifically, the energy scheduling problem is first cast into a combinatorial optimization problem. Then, a distributed algorithm is designed, where energy providers and consumers jointly compute the optimal energy consumption allocation, energy provider selection and price. The algorithm can maximize the aggregate utility of all consumers in the system in a fair and efficient fashion. Simulation results confirm that the proposed distributed algorithm can potentially benefit both consumers and energy providers.

关键词： Pricing Energy consumption Real-time systems Aggregates Smart grids Optimization Electricity

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Discrete-time sliding mode control for a class of stochastic system

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ICIC Express Letters 2013年第7期7卷 2087-2092页

作者： Chang, Ru Fang, Yiming Liu, Le Li, Jianxiong Key Lab of Industrial Computer Control Engineering of Hebei Province Institute of Electrical Engineering Yanshan University No. 438 Hebei Street Qinhuangdao 066004 China National Engineering Research Center for Equipment and Technology of Cold Strip Rolling Hebei Street Qinhuangdao 066004 China

This paper is concerned with the discrete-time sliding mode control (SMC) problem for a class of stochastic system. A sufficient condition is presented to ensure the mean-square asymptotic stability of the stochastic system in the sliding mode by solving a linear objective function. Moreover, a power function is introduced to design a novel discrete sliding mode controller. The controller can guarantee the good dynamic quality of the stochastic system, and can ensure the reachability of the discrete-time sliding motion. Finally, a numerical example is given to illustrate the validity of the proposed SMC scheme. © 2013 ICIC International.

关键词： Stochastic systems

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Fuzzy control of clutch engagement with engine running at local constant speed

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Journal of Computational Information Systems 2013年第9期9卷 3423-3430页

作者： Zang, Huaiquan Fan, Jinlong Key Lab. of Industrial Computer Control Engineering of Heibei Province Yanshan University Qinhuangdao 066004 China

Aiming at the starting process of automated mechanical transmission, control algorithm of engaging process of clutch is studied. Firstly, the simplified dynamic model of clutch engagement is established. Secondly, the starting process of automobile is analyzed and the relationship between clutch engagement speed and jerk is obtained. Finally, fuzzy control algorithm of clutch engagement with engine running at local constant speed is proposed by combining engine constant speed control with fuzzy control of engaging process of clutch. Simulation results show that the algorithm can not only embody the driver's operation intention, but also ensure clutch engagement quickly and smoothly. © 2013 by Binary Information Press.

关键词： Clutches

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Study on modeling and stability analysis of nonlinear transmission system of wind turbine generator system

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Journal of Computational Information Systems 2013年第3期9卷 995-1002页

作者： Fan, Fengjie Fu, Liyuan Song, Minghou Meng, Zong Key Laboratory of Measurement Technology and Instrumentation of Hebei Province Yanshan University Qinhuangdao 066004 China Key Laboratory of Industrial Computer Control Engineering of Hebei Province Yanshan University Qinhuangdao 066004 China

The nonlinear dynamical model of wind turbine generator(WTG) drive system is presented considering nonlinear stiffness of the drive system. The frequency characteristics of wind turbine drive system incented by different forms, such as phase plane and Poincaré section are studied by simulation. The stability of wind turbine generator drive system is analyzed by using bifurcation and chaos theories. The stability of the periodic motion and the process of period-doubling bifurcation into chaos are further studied, and the effect of nonlinear stiffness on stability of wind turbine generator drive system is showed. The results show that negative nonlinear stiffness is beneficial to keep the stability of system, and when the chaos appears on the system, incentive parameter increases as the negative nonlinear stiffness increases. Copyright © 2013 Binary Information Press.

关键词： Wind Turbine Generators

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Optimization of rolling schedules based on improved artificial fish swarm algorithm for aluminum strip hot rolling mills

Optimization of rolling schedules based on improved artifici...

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Chinese control Conference (CCC)

作者： Jing-ming Yang Shuang Xu Haijun Che Zhiwei Zhao National Engineering Research Center for Equipment and Technology of Cold Strip Rolling Hebei Qinhuangdao 066004 China Key Lab of Industrial Computer Control Engineering of Hebei Province Yanshan University Qinhuangdao 066004 China

The quality and yield of the products in the process of hot rolling is affected seriously by slipping phenomenon. In order to solve the phenomenon in aluminum hot rolling, on the basis of considering various factors which lead to slip, the concept of hot rolling slip factor is proposed, and a multi-objective function with equal power margin and preventing the slip phenomenon is established, and the improved artificial fish swarm algorithm is applied to optimize the reduction of first three stands. Adaptive step and improved move strategy are introduced into the proposed algorithm on the basis of basic fish swarm algorithm, which has better accuracy of optimization and faster convergence speed. The optimized schedule is applied to roll aluminum of 1050 in one hot rolling mill, and the performance is satisfied.

关键词： Marine animals Electronic mail Aluminum Optimization Schedules Strips Educational institutions

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