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Optimal variable structure control with sliding modes for unstable processes 被引量:4
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作者 KUMAR Satyendra AJMERI Moina 《Journal of Central South University》 SCIE EI CAS CSCD 2021年第10期3147-3158,共12页
In this work,a variable structure control(VSC)technique is proposed to achieve satisfactory robustness for unstable processes.Optimal values of unknown parameters of VSC are obtained using Whale optimization algorithm... In this work,a variable structure control(VSC)technique is proposed to achieve satisfactory robustness for unstable processes.Optimal values of unknown parameters of VSC are obtained using Whale optimization algorithm which was recently reported in literature.Stability analysis has been done to verify the suitability of the proposed structure for industrial processes.The proposed control strategy is applied to three different types of unstable processes including non-minimum phase and nonlinear systems.A comparative study ensures that the proposed scheme gives superior performance over the recently reported VSC system.Furthermore,the proposed method gives satisfactory results for a cart inverted pendulum system in the presence of external disturbance and noise. 展开更多
关键词 variable structure control sliding mode control Whale optimization algorithm ROBUSTNESS non-linear system
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Compensation for secondary uncertainty in electro-hydraulic servo system by gain adaptive sliding mode variable structure control 被引量:11
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作者 张友旺 桂卫华 《Journal of Central South University of Technology》 EI 2008年第2期256-263,共8页
Based on consideration of the differential relations between the immeasurable variables and measurable variables in electro-hydraulic servo system,adaptive dynamic recurrent fuzzy neural networks(ADRFNNs) were employe... Based on consideration of the differential relations between the immeasurable variables and measurable variables in electro-hydraulic servo system,adaptive dynamic recurrent fuzzy neural networks(ADRFNNs) were employed to identify the primary uncertainty and the mathematic model of the system was turned into an equivalent linear model with terms of secondary uncertainty.At the same time,gain adaptive sliding mode variable structure control(GASMVSC) was employed to synthesize the control effort.The results show that the unrealization problem caused by some system's immeasurable state variables in traditional fuzzy neural networks(TFNN) taking all state variables as its inputs is overcome.On the other hand,the identification by the ADRFNNs online with high accuracy and the adaptive function of the correction term's gain in the GASMVSC make the system possess strong robustness and improved steady accuracy,and the chattering phenomenon of the control effort is also suppressed effectively. 展开更多
关键词 electro-hydraulic servo system adaptive dynamic recurrent fuzzy neural network(ADRFNN) gain adaptive slidingmode variable structure control(GASMVSC) secondary uncertainty
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Adaptive variable structure control for large-scale time-delayed systems with unknown nonlinear dead-zone 被引量:1
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作者 Shen Qikun Zhang Tianping 《Journal of Systems Engineering and Electronics》 SCIE EI CSCD 2007年第4期865-870,共6页
The problem of adaptive fuzzy control for a class of large-scale, time-delayed systems with unknown nonlinear dead-zone is discussed here. Based on the principle of variable structure control, a design scheme of adapt... The problem of adaptive fuzzy control for a class of large-scale, time-delayed systems with unknown nonlinear dead-zone is discussed here. Based on the principle of variable structure control, a design scheme of adaptive, decentralized, variable structure control is proposed. The approach removes the conditions that the dead-zone slopes and boundaries are equal and symmetric, respectively. In addition, it does not require that the assumptions that all parameters of the nonlinear dead-zone model and the lumped uncertainty are known constants. The adaptive compensation terms of the approximation errors axe adopted to minimize the influence of modeling errors and parameter estimation errors. By theoretical analysis, the closed-loop control system is proved to be semiglobally uniformly ultimately bounded, with tracking errors converging to zero. Simulation results demonstrate the effectiveness of the approach. 展开更多
关键词 nonlinear dead-zone decentralized control adaptive control variable structure control
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Decentralized Variable Structure Control of Complex Giant Singular Uncertainty Systems 被引量:1
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作者 Wen Xiangcai&Liu Yongqing (Department of Automation, South China University of Technology Guangzhou, 510641, P. R. China.) 《Journal of Systems Engineering and Electronics》 SCIE EI CSCD 1996年第1期23-34,共12页
This paper, at the first time, considers the problem of decentralized variable structure control of complex giant singular uncertainty systems by using the property of diagonally dominant matrix and Frobenius-Person t... This paper, at the first time, considers the problem of decentralized variable structure control of complex giant singular uncertainty systems by using the property of diagonally dominant matrix and Frobenius-Person theorem. The splendid selection of switching manifold for each subsystem makes the design relatively straightforward and can be easily realized. An illustrate example is given. 展开更多
关键词 Complex giant singular uncertainty systems Multiple input interconnected Decentralized variable structure control Sliding mode Completely controllable.
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Adaptive synchronization of a class of chaotic systems via variable structure control
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作者 Li Huiguang Zhang Xinying Guan Xinping 《Journal of Systems Engineering and Electronics》 SCIE EI CSCD 2005年第4期858-861,865,共5页
The synchronization problem under two cases is considered. One is that the bound on the uncertainty existing in the controller is known, the other is that the bound is unknown. In the latter case, the simple adaptatio... The synchronization problem under two cases is considered. One is that the bound on the uncertainty existing in the controller is known, the other is that the bound is unknown. In the latter case, the simple adaptation laws for upper bound on the norm of the uncertainty is proposed. Using this adaptive upper bound, a variable structure control is designed. The proposed method does not guarantee the convergence of the adaptive upper bound to the real one but makes the system asymptotically stable. 展开更多
关键词 chaotic synchronization UNCERTAINTY variable structure control.
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Stabilization Variable Structure Control for Singular Decoupling Motor System
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作者 Zou, Wenxun Liu, Yongqing 《Journal of Systems Engineering and Electronics》 SCIE EI CSCD 1997年第1期65-72,共8页
This paper describes the important application of variable structure control (VSC) theory on induction motor (IM) decoupling control system. A design scheme using singular system variable structure control method for ... This paper describes the important application of variable structure control (VSC) theory on induction motor (IM) decoupling control system. A design scheme using singular system variable structure control method for a decoupling IM system is presented. The scheme is shown to be robust to parametric variations and external disturbances. Simulation results show the stability and effectiveness of the proposed scheme 展开更多
关键词 Singular system Sliding mode Variable structure control Decoupling control Switch- ing function.
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Variable structure guidance law for attacking surface maneuver targets 被引量:16
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作者 Han Yanhua Xu Bo 《Journal of Systems Engineering and Electronics》 SCIE EI CSCD 2008年第2期337-341,共5页
The characteristics of surface maneuver targets are analyzed and a 3-D relative motion model for missiles and targets is established. A variable structure guidance law is designed considering the characteristics of ta... The characteristics of surface maneuver targets are analyzed and a 3-D relative motion model for missiles and targets is established. A variable structure guidance law is designed considering the characteristics of targets. In the guidance law, the distance between missiles and targets as well as the missile-target relative velocity are all substituted by estimation values. The estimation errors, the target's velocity, and the maneuver acceleration are all treated as bounded disturbance. The guidance law proposed can be implemented conveniently in engineering with little target information. The performance of the guidance system is analyzed theoretically and the numerical simulation result shows the effectiveness of the guidance law. 展开更多
关键词 air-to-surface missile guidance law variable structure control surface maneuver target.
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Mathematic modeling on flexible cooling system in hot strip mill 被引量:4
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作者 彭良贵 刘相华 +1 位作者 赵宪明 吴迪 《Journal of Central South University》 SCIE EI CAS 2014年第1期43-49,共7页
A novel cooling system combining ultra fast cooling rigs with laminar cooling devices was investigated.Based on the different cooling mechanisms,a serial of mathematic models were established to describe the relations... A novel cooling system combining ultra fast cooling rigs with laminar cooling devices was investigated.Based on the different cooling mechanisms,a serial of mathematic models were established to describe the relationship between water flow and spraying pressure and the relationship between water spraying heat flux and layout of nozzles installed on the top and bottom cooling headers.Model parameters were validated by measured data.Heat transfer models including air convection model,heat radiation model and water cooling capacity model were detailedly introduced.In addition,effects on cooling capacity by water temperature and different valve patterns were also presented.Finally,the comparison results from UFC used or not have been provided with respect to temperature evolution and mechanical properties of Q235B steel grade with thickness of 7.8 mm.Since online application of the sophisticated CTC process control system based on these models,run-out table cooling control system has been running stably and reliably to produce resource-saving,low-cost steels with smaller grain size. 展开更多
关键词 mathematic model ultra fast cooling laminar flow cooling variable frequency control coiling temperature control
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Parameter design and performance analysis of zero inertia continuously variable transmission system 被引量:1
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作者 胡建军 吉毅 晏玖江 《Journal of Central South University》 SCIE EI CAS CSCD 2015年第1期180-188,共9页
In order to solve the problem of weak power performance of vehicle equipped with continuously variable transmission(CVT) system working under transient operating conditions, a new CVT equipped with planetary gear mech... In order to solve the problem of weak power performance of vehicle equipped with continuously variable transmission(CVT) system working under transient operating conditions, a new CVT equipped with planetary gear mechanism and flywheel was researched, a design method of transmission parameter optimization was proposed, and the comprehensive matching control strategy was established for the new transmission system. Fuzzy controllers for throttle opening and CVT speed ratio were designed, and power performance and fuel economy of both vehicles respectively equipped with conventional CVT system and new transmission system wrere compared and analyzed by simulation. The results show that power performance and fuel economy of the vehicle equipped with new transmission system are better than that equipped with conventional CVT, thus the rationality of the parameter design method and control algorithm are verified. 展开更多
关键词 continuously variable transmission inertia optimization fuzzy control simulation
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A Harmonic Disturbance Suppression Method For Frequency Time-variable Systems
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作者 ZHOU Xinxiu FANG Jiancheng +1 位作者 LIU Gang ZHANG Ran 《中国电机工程学报》 EI CSCD 北大核心 2011年第36期I0012-I0012,247,共1页
The problem of complete rejection of external inaccessible disturbances plays an important role in the modem control theory.Analysis and design of a control system with harmonic disturbances are challenging.This paper... The problem of complete rejection of external inaccessible disturbances plays an important role in the modem control theory.Analysis and design of a control system with harmonic disturbances are challenging.This paper present both linear and nonlinear harm onics observers for systems with harm onic disturbances. 展开更多
关键词 harmonic disturbance linear matrix inequality nonlinear disturbance observer variable structure control magnetically suspended
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