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2010 8th IEEE International Conference on control and Automation, ICCA 2010

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

ISBN: (纸本)9781424451951

The problem of adaptive robust control for uncertain nonlinear systems with time-varying delay is considered in this paper. The upper bound of the uncertainty is assumed to be nonlinear functions with unknown coefficients. By using adaptive control method, a class of adaptive robust state feedback controller is proposed. Based on Lyapunov-Krasovskii method and Lyapunov stability theory, it is shown that the controller designed can render the uniform asymptotic stability of the system. Finally, a numerical example is given to show the controller is valid. © 2010 IEEE.

关键词： controllers

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Robust MPC algorithm for discrete-time systems with time-varying delay and nonlinear perturbations

Robust MPC algorithm for discrete-time systems with time-var...

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作者： Li, Jianxiong Fang, Yiming Shi, Shengli Institute of Electrical Engineering Key Lab. of Industrial Computer Control Engineering of Hebei Province Yanshan University Qinhuangdao 066004 China

ISBN: (纸本)9787894631046

A robust model predictive control (MPC) algorithm is presented for a class of discrete-time uncertain systems with time-varying delay, input constraints and norm-bounded nonlinear perturbations. By minimizing the upper bound of a cost function, an MPC state feedback control law is calculated at each step. The proposed MPC method for delayed system is delay-dependent, and it is effective to deal with nonlinear perturbations. It has been shown that the robust stability of the closed-loop systems is guaranteed by the proposed algorithm. Finally, a numerical example is given to illustrate the effectiveness of the proposed method.

关键词： Model predictive control

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Adaptive Backstepping control of Hydraulic Servo System with Input Saturation for Rolling Mill based on Multi-model Switching

Adaptive Backstepping Control of Hydraulic Servo System with...

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第三十二届中国控制会议

作者： LI Yehong FANG Yiming LI Jianxiong SHI Shengli Key Lab of Industrial Computer Control Engineering of Hebei Province Yanshan University National Engineering Research Center for Equipment and Technology of Cold Strip Rolling

ISBN: (纸本)9781479900305

For the problems of parameters change abruptly and input saturation of the rolling mill hydraulic servo systems,an adaptive backstepping control method based on multi-model switching is presented in this ***,multiple models of the rolling mill hydraulic servo systems under different operating modes are ***,an auxiliary system is introduced to reduce the effects of input saturation,and the adaptive backstepping controllers are designed for all *** the help of common Lyapunov theory,the proposed method can guarantee stability of the multi-model switched system under arbitrary switching ***,the simulation results demonstrate the effectiveness of the proposed control method.

关键词： Hydraulic servo system Rolling mill Input saturation Multi-model switching Backstepping

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Adaptive cross-coupled sliding mode control for synchronization of dual-cylinder electro-hydraulic servo systems 34

Adaptive cross-coupled sliding mode control for synchronizat...

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第三十四届中国控制会议

作者： SUN Mengfei LI Jianxiong FANG Yiming Key Lab of Industrial Computer Control Engineering of Hebei Province Yanshan University National Engineering Research Center for Equipment and Technology of Cold Strip Rolling

ISBN: (纸本)9781467374439

To improve the equality of continuous casting billet, synchronization control is investigated for continuous casting mold driven by dual-cylinder electro-hydraulic servo systems(EHSS) in this paper. A second-order super twisting sliding mode controller is developed for each cylinder EHSS, in which cross-coupled errors are employed to construct the sliding mode surfaces, which guarantee that trajectory tracking errors of each cylinder EHSS and the synchronization error can rapidly converge to zero in finite time even in presence of the parameter uncertainties and external disturbances. Furthermore, to reduce the chartering caused by the discontinuous control law of sliding mode control, adaptive gains are employed during the sliding mode controller design. Thus, an adaptive sliding surface cross-coupled synchronization controller is presented by employing Lyapunov stability theorems. Simulation results in a model obtained from a real continuous casting mold demonstrate the effectiveness of the method.

关键词： Dual-cylinder electro-hydraulic servo systems,synchronization,sliding mode control,cross-coupling,continuous casting mold

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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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Nonlinear Auto Disturbance Rejection control for Vibration Displacement System of Continuous Cast Mold Driven by Servo Motor 35

Nonlinear Auto Disturbance Rejection Control for Vibration D...

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第35届中国控制会议

作者： ZHENG Huicheng LIU Le FANG Yiming LI Qiang Key Lab of Industrial Computer Control Engineering of Hebei Province Yanshan University National Engineering Research Center for Equipment and Technology of Cold Strip Rolling

ISBN: (纸本)9781509009107

Aiming at the problem about the nonlinear function and the mechanical zero offset in the vibration system of continuous casting mold driven by servo motor, a discrete auto disturbance rejection control（ADRC） with nonlinear function processing algorithm is proposed. Firstly, for the nonlinear multi solutions problem existing between rotation angle and displacement of mold, a nonlinear algorithm is proposed to get the practical phase difference of eccentric shaft. The algorithm is achieved by calculating the time difference between ideal time of arrival and actual time of arrival at the same position. Secondly, the mathematical model of vibration system is discretized by using the Euler method, and an ADRC is designed to estimate the eccentric shaft mechanical zero offset and load disturbance, and then compensate and weaken the position error. Finally, the simulation results demonstrate the feasibility of the proposed method.

关键词： Continuous casting mold Non-sinusoidal vibration Driven by servo motor Auto disturbance rejection control

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Expression recognition algorithm based on local and global feature reconstruction residuals 7

Expression recognition algorithm based on local and global f...

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7th International Conference on Information Science and control engineering, ICISCE 2020

作者： Li, Yaqian Lei, Ya Wu, Chao Li, Haibin Yanshan University Key Laboratory of Industrial Computer Control Engineering of Hebei Province Qinhuangdao China

ISBN: (纸本)9781728164069

In this paper, an algorithm is proposed to improve expression recognition by combining reconstructed residuals of local and global information. Firstly, positional relation is introduced into local binary features encoding, and a non-negative matrix decomposition method with sparse correlation constraints is employed to perform reducing of dimension. Then, the features are encoded by bag-of-words model to form local features. Secondly, a discrete wavelet transform is used to emphasis on expression information and extract expression-enhanced global features. Thirdly, collab.ration Represents is used to calculate local partial reconstruction residuals and is combined with global reconstruction residuals to construct the final residual to be classified at the decision level. Experiments on Jaffe, TEFID and CK+ data sets prove the effectiveness of the proposed algorithm. © 2020 IEEE.

关键词： Discrete wavelet transforms

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PSO algorithm based PID parameters optimization of hydraulic screwdown system of cold strip mill

PSO algorithm based PID parameters optimization of hydraulic...

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2011 International Conference on Fluid Power and Mechatronics, FPM 2011

作者： Chen, Dongning Zhang, Guofeng Yao, Chengyu Key Lab of Heavy Machinery Fluid Power Transmission and Control of Hebei Province Yanshan University Qinhuangdao China Key Lab of Industrial Computer Control Engineering of Hebei Province Yanshan University Qinhuangdao China

ISBN: (纸本)9781424484522

Hydraulic screwdown system of cold strip mill is nonlinear, time-variant system and it is disturbed by many factors, so the turning quality of controller influences the accuracy of Automatic Gauge control (AGC). In this paper an optimum design method based on particle swarm optimization (PSO) algorithm is presented for PID controller parameters optimization of hydraulic servo screwdown system of one cold strip mill. With PSO algorithm it is fast to calculate PID controller parameters through minimizing the fitness function and searching on the given controller parameter space. Simulation shows that the PID controller turned by PSO algorithm can achieve better control performance than Genetic Algorithm (GA) in AGC system of one single stand reversing cold rolling mill. © 2011 IEEE.

关键词： Three term control systems

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Microgrid Economic Dispatch Problem Based on Distributed Algorithm in V2G Background 13

Microgrid Economic Dispatch Problem Based on Distributed Alg...

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13th IEEE Data Driven control and Learning Systems Conference, DDCLS 2024

作者： Ren, Lina Li, Shuai Hu, Zhihan Yanshan University Key Lab of Industrial Computer Control of Hebei Province Qinhuangdao066004 China

ISBN: (纸本)9798350361674

With the emergence of increasingly complex modern energy networks, there is a need for flexible and reliable methods to solve economic dispatch problems in smart grids. For this purpose, a broadcast gossip algorithm is proposed for solving the economic dispatch problem in a smart grid environment populated with distributed generators and vehicle to grid. First, with the objective of minimizing the system cost, the cost model of each part of the microgrid is developed under various constraints. At the same time, considering the peak-to-valley difference in the process of electric energy dispatching, this paper proposes an electric vehicle incentive and compensation cost model to achieve the purpose of making the grid peak and valley reduction. Then, an event triggering mechanism is introduced to save communication resources while economical scheduling. Finally, the proposed model and algorithm are simulated and analyzed by using the microgrid structure of IEEE 11 - bus standard, and the effectiveness of the proposed model and algorithm are verified. © 2024 IEEE.

关键词： Vehicle-to-grid

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A switching-based backstepping sliding mode control for space manipulator in presence of gravity variation

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High Technology Letters 2021年第4期27卷 454-462页

作者： Liu Fucai Zhao Wenna Meng Lingcong Liu Shuo Key Laboratory of Industrial Computer Control Engineering of Hebei Province Yanshan UniversityQinhuangdao 066004P.R.China Engineering Department University of SheffieldSheffieldUK

A novel switching-based backstepping sliding mode control(SBSMC) scheme is devised for the space manipulator exposed to different *** a view to distinct differences in dynamics properties when the operating conclition of space manipulator changer,the space manipulator can be thought of as a system composed of two subsystems,the ground subsystem and the space *** different types of backstepping sliding mode(BSM) controllers are designed,one is suited for the ground subsystem and the other is for the space *** switching between two subsystems can be implemented automatically when the switching mechanism is triggered,and the controllers for their subsystems experience synchronous *** this way,the space manipulator always has good behaviors in trajectory ***,multi-Lyapunov functions are introduced to prove the stability of this switching *** to simulation results,the method constructed in this research has better performance in control precision and adaptability compared with proportional-derivative(PD) control.

关键词： space manipulator microgravity switching system multi-Lyapunov functions backstepping sliding mode control(BSMC)

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