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Adaptive control of uncertain time-delay chaotic systems 被引量:1
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作者 Zhuhong ZHANG 《控制理论与应用(英文版)》 EI 2005年第4期357-363,共7页
This work investigates adaptive control of a large class of uncertain time-delay chaotic systems (UTCSs) with unknown general perturbation terms bounded by a polynomial (unknown gains), Associated with the differe... This work investigates adaptive control of a large class of uncertain time-delay chaotic systems (UTCSs) with unknown general perturbation terms bounded by a polynomial (unknown gains), Associated with the different cases of known and unknowl system matrices, two corresponding adaptive controllers are proposed to stabilize unstable fixed points of the systems by means of Lyapunov stability theory and linear matrix inequafities (LMI) which can be solved easily by convex optimization algorithms, Two examples are used for examining the effectiveness of the proposed methods. 展开更多
关键词 Adaptive control uncertain time-delay chaotic system STABILITY LMI
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Observer-based adaptive control of uncertain time-delay switched systems with stuck actuator faults
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作者 Limin WANG Cheng SHAO 《控制理论与应用(英文版)》 EI 2009年第2期219-223,共5页
This paper concerns the observer-based adaptive control problem of uncertain time-delay switched systems with stuck actuator faults. Under the case where the original controller cannot stabilize the faulty system, mul... This paper concerns the observer-based adaptive control problem of uncertain time-delay switched systems with stuck actuator faults. Under the case where the original controller cannot stabilize the faulty system, multiple adaptive controllers are designed and a suitable switching logic is incorporated to ensure the closed-loop system stability and state tracking. New delay-independent sufficient conditions for asymptotic stability are obtained in terms of linear matrix inequalities based on piecewise Lyapunov stability theory. On the other hand, adaptive laws for on-line updating of some of the controller parameters are also designed to compensate the effect of stuck failures. Finally, simulation results for reference [1] model show that the design is feasible and efficient. 展开更多
关键词 Observer-based adaptive control Tuck actuator faults DELAY-INDEPENDENT uncertain time-delay switched systems
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Average Consensus in Directed Networks of Multi-agents with Uncertain Time-varying Delays 被引量:8
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作者 WANG Zhao-Xia DU Da-Jun FEI Min-Rui 《自动化学报》 EI CSCD 北大核心 2014年第11期2602-2608,共7页
关键词 多代理系统 时变延迟 平均 网络 拓扑结构 充分条件 通信延迟 时间变化
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PASSIVE CONTROL FOR A CLASS OF UNCERTAIN TIME-DELAY SYSTEMS
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作者 李志虎 邵惠鹤 《Journal of Shanghai Jiaotong university(Science)》 EI 2001年第1期36-39,43,共5页
This paper focuses on the passive control for a class of linear time delay system with norm bounded time varying parameter uncertainties by using a linear matrix inequality (LMI) approach. A sufficient condition under... This paper focuses on the passive control for a class of linear time delay system with norm bounded time varying parameter uncertainties by using a linear matrix inequality (LMI) approach. A sufficient condition under which the uncertain time delay system is quadratically stable and strictly passive for all admissible uncertainties was derived. It is shown that the solvability of problem of the robust passive controller design is implied by the feasibility of a linear matrix inequality. 展开更多
关键词 passive control uncertain systems time delay linear matrix inequalities
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Integral sliding mode control of time-delay systems with mismatching uncertainties 被引量:3
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作者 Fu Zhao Yu Liu Xiuming Yao Baoku Su 《Journal of Systems Engineering and Electronics》 SCIE EI CSCD 2010年第2期273-280,共8页
A linear matrix inequality (LMI)-based sliding surface design method for integral sliding mode control of uncertain time- delay systems with mismatching uncertainties is proposed. The uncertain time-delay system und... A linear matrix inequality (LMI)-based sliding surface design method for integral sliding mode control of uncertain time- delay systems with mismatching uncertainties is proposed. The uncertain time-delay system under consideration may have mis- matching norm bounded uncertainties in the state matrix as well as the input matrix, A sufficient condition for the existence of a sliding surface is given to guarantee asymptotic stability of the full order slJdJng mode dynamics. An LMI characterization of the slid- ing surface is given, together with an integral sliding mode control law guaranteeing the existence of a sliding mode from the initial time. Finally, a simulation is given to show the effectiveness of the proposed method. 展开更多
关键词 linear matrix inequality integral sliding mode control uncertain time-delay systems mismatching uncertainties.
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ROBUST STABILITY FOR A TYPE OF UNCERTAIN TIME-DELAY SYSTEMS 被引量:1
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作者 年晓红 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI 2000年第4期479-484,共6页
Some new results for stability of uncertain time-delay systems are derived and the stability degree is also discussed. Some previous results for stability and robust stability of time-delay systems are improved. Lastl... Some new results for stability of uncertain time-delay systems are derived and the stability degree is also discussed. Some previous results for stability and robust stability of time-delay systems are improved. Lastly, examples are included to illustrate our results. 展开更多
关键词 uncertain time-delay system robust stability stability degree
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An Enduring Partnership In Uncertain Times
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作者 LISA CURTIS 《Beijing Review》 2009年第49期14-15,共2页
The United States and India reaffirm their mutual commitment during Indian prime minister’s recent U.S. trip u.S. President Barack Obama welcomed Indian Prime Minister Manmohan Singh on November 24 with an em- phasis... The United States and India reaffirm their mutual commitment during Indian prime minister’s recent U.S. trip u.S. President Barack Obama welcomed Indian Prime Minister Manmohan Singh on November 24 with an em- phasis on the continuing value of a partnership carefully developed over 展开更多
关键词 An Enduring Partnership In uncertain times
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Supply Coordination Based on Bonus Policy in Assembly under Uncertain Delivery Time 被引量:1
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作者 LI Guo LIU Mengqi +1 位作者 WANG Zhaohua PENG Bingzong 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2013年第2期293-303,共11页
The existing research of supply coordination under uncertain delivery time mainly focuses on the collaboration between the supplier and the manufacturer, which aim at minimizing the total cost of each side and finding... The existing research of supply coordination under uncertain delivery time mainly focuses on the collaboration between the supplier and the manufacturer, which aim at minimizing the total cost of each side and finding comparative optimal solutions under decentralized decision. In the supply coordination, the collaboration between suppliers in assembly system is usually not considered. As a result, the manufacturer’s production is often delayed due to mismatching delivery of components between suppliers. Therefore, to ensure supply coordination in assembly system, collaboration between suppliers should be taken into consideration. In this paper, an assembly system with two suppliers and one manufacturer under uncertain delivery time is considered. The model is established and optimal solution is given under decentralized decision. Furthermore, the cost functions of two suppliers are both convex, and a unique Nash equilibrium exists between two suppliers. Then the optimal decision under supply coordination is analyzed, which is regarded as a benchmark for supply coordination. Additionally, the total cost of the assembly system is jointly convex in agreed delivery time. To achieve supply coordination a bonus policy is explored in the assembly system under uncertain delivery time, and the total cost under bonus policy must be lower than under decentralized decision. Finally the numerical and sensitivity analysis shows the cost of assembly system under bonus policy equals that under supply coordination, and the cost of each side in assembly system under bonus policy is lower compared to that under decentralized decision. The proposed research minimizes the total cost of each side with bonus policy in assembly system, ensures the supply coordination between suppliers and the manufacturer, and improves the competiveness of the whole supply chain. 展开更多
关键词 supply coordination bonus policy assembly system uncertain delivery time
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Stability analysis and design of time-delay uncertain systems using robust reliability method 被引量:4
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作者 Shuxiang Guo 《Journal of Systems Engineering and Electronics》 SCIE EI CSCD 2011年第3期493-499,共7页
A robust reliability method for stability analysis and reliability-based stabilization of time-delay dynamic systems with uncertain but bounded parameters is presented by treating the uncertain parameters as interval ... A robust reliability method for stability analysis and reliability-based stabilization of time-delay dynamic systems with uncertain but bounded parameters is presented by treating the uncertain parameters as interval variables.The performance function used for robust reliability analysis is defined by a delayindependent stability criterion.The design of robust controllers is carried out by solving a reliability-based optimization problem in which the control cost satisfying design requirements is minimized.This kind of treatment makes it possible to achieve a balance between the reliability and control cost in the design of controller when uncertainties must be taken into account.By the method,a robust reliability measure of the degree of stability of a time-delay uncertain system can be provided,and the maximum robustness bounds of uncertain parameters such that the time-delay system to be stable can be obtained.All the procedures are based on the linear matrix inequality approach and therefore can be carried out conveniently.The effectiveness and feasibility of the proposed method are demonstrated with two practical examples.It is shown by numerical simulations and comparison that it is meaningful to take the robust reliability into account in the control design of uncertain systems. 展开更多
关键词 STABILITY uncertain system time-delay system robust reliability linear matrix inequality(LMI).
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Robust H∞ Control with Exponent Stability for Time-Delay Uncertain Systems 被引量:1
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作者 Luo Xiaoyuan 《Journal of Systems Engineering and Electronics》 SCIE EI CSCD 2002年第1期27-33,共7页
This paper is concerned with the robust H ∞ control with exponent stability for a class of time delay uncertain systems. Attention is focused on the design of controllers such that the resulting closed loop system... This paper is concerned with the robust H ∞ control with exponent stability for a class of time delay uncertain systems. Attention is focused on the design of controllers such that the resulting closed loop system not only is exponentially stable but also satisfies, H ∞ disturbance attenuance via memoryless state feedback control. Sufficient conditions for feasibility are obtained in terms of LMIs. Moreover, optimization of LMI is considered such that the controller with low gain parameters is formulated. 展开更多
关键词 uncertain system time delay Robust H control Exponent attenuance LMI.
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Robust Stabilization for Linear Time-varying Uncertain Periodic Descriptor Systems 被引量:4
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作者 JI Xiao-Fu YANG Ze-Bin +1 位作者 SUN Yu-Kun SU Hong-Ye 《自动化学报》 EI CSCD 北大核心 2008年第9期1219-1220,共2页
这个问题赶出为线性变化时间的不明确的周期的描述符系统的稳定被重游。为线性变化时间的不明确的周期的描述符系统基于柔韧的稳定性的概念,为柔韧的稳定性的一个必要、足够的条件被提出。柔韧的稳定问题也被学习,相应必要、足够的条... 这个问题赶出为线性变化时间的不明确的周期的描述符系统的稳定被重游。为线性变化时间的不明确的周期的描述符系统基于柔韧的稳定性的概念,为柔韧的稳定性的一个必要、足够的条件被提出。柔韧的稳定问题也被学习,相应必要、足够的条件用双系统的符号被给。获得的矩阵不平等条件能被转变到与一些免费矩阵的介绍的线性矩阵不平等一,它使分析和设计过程简单、可靠。 展开更多
关键词 稳定性 自动化系统 周期 控制系统
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Sensor Fault Diagnosis for a Class of Time Delay Uncertain Nonlinear Systems Using Neural Network 被引量:4
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作者 Mou Chen Chang-Sheng Jiang Qing-Xian Wu 《International Journal of Automation and computing》 EI 2008年第4期401-405,共5页
In this paper,a sliding mode observer scheme of sensor fault diagnosis is proposed for a class of time delay nonlinear systems with input uncertainty based on neural network.The sensor fault and the system input uncer... In this paper,a sliding mode observer scheme of sensor fault diagnosis is proposed for a class of time delay nonlinear systems with input uncertainty based on neural network.The sensor fault and the system input uncertainty are assumed to be unknown but bounded.The radial basis function (RBF) neural network is used to approximate the sensor fault.Based on the output of the RBF neural network,the sliding mode observer is presented.Using the Lyapunov method,a criterion for stability is given in terms of matrix inequality.Finally,an example is given for illustrating the availability of the fault diagnosis based on the proposed sliding mode observer. 展开更多
关键词 uncertain nonlinear system time delay radial basis function (RBF) neural network sliding mode observer fault diag-nosis.
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New Robust Exponential Stability Analysis for Uncertain Neural Networks with Time-varying Delay 被引量:3
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作者 Yong-Gang Chen Wei-Ping Bi 《International Journal of Automation and computing》 EI 2008年第4期395-400,共6页
In this paper,the global robust exponential stability is considered for a class of neural networks with parametric uncer- tainties and time-varying delay.By using Lyapunov functional method,and by resorting to the new... In this paper,the global robust exponential stability is considered for a class of neural networks with parametric uncer- tainties and time-varying delay.By using Lyapunov functional method,and by resorting to the new technique for estimating the upper bound of the derivative of the Lyapunov functional,some less conservative exponential stability criteria are derived in terms of linear matrix inequalities (LMIs).Numerical examples are presented to show the effectiveness of the proposed method. 展开更多
关键词 Robust exponential stability uncertain neural networks time-varying delay Lyapunov functional method linear matrix inequalities (LMIs).
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Decentralized robust guaranteed cost control for a class of interconnected singular large-scale systems with time-delay and parameter uncertainty 被引量:8
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作者 Wo Songlin Shi Guodong Zou Yun 《Journal of Systems Engineering and Electronics》 SCIE EI CSCD 2007年第1期111-119,共9页
The decentralized robust guaranteed cost control problem is studied for a class of interconnected singular large-scale systems with time-delay and norm-bounded time-invariant parameter uncertainty under a given quadra... The decentralized robust guaranteed cost control problem is studied for a class of interconnected singular large-scale systems with time-delay and norm-bounded time-invariant parameter uncertainty under a given quadratic cost performance function. The problem that is addressed in this study is to design a decentralized robust guaranteed cost state feedback controller such that the closed-loop system is not only regular, impulse-free and stable, but also guarantees an adequate level of performance for all admissible uncertainties. A sufficient condition for the existence of the decentralized robust guaranteed cost state feedback controllers is proposed in terms of a linear matrix inequality (LMI) via LMI approach. When this condition is feasible, the desired state feedback decentralized robust guaranteed cost controller gain matrices can be obtained. Finally, an illustrative example is provided to demonstrate the effectiveness of the proposed approach. 展开更多
关键词 uncertain singular large-scale systems time-delay system Guaranteed cost control LMI
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Delay-dependent Robust Stability for Uncertain Stochastic Systems with Interval Time-varying Delay 被引量:5
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作者 ZHANG Yan HE Yong WU Min 《自动化学报》 EI CSCD 北大核心 2009年第5期577-582,共6页
关键词 随机系统 稳定性 自动化 分析
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Robust stability analysis of uncertain discrete-time systems with state delay
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作者 RenZhengyun ZhangLiqun ShaoHuihe 《Journal of Systems Engineering and Electronics》 SCIE EI CSCD 2004年第2期153-157,共5页
The sufficient conditions of stability for uncertain discrete-time systems with state delay have been proposed by some researchers in the past few years, yet these results may be conservative in application. The stabi... The sufficient conditions of stability for uncertain discrete-time systems with state delay have been proposed by some researchers in the past few years, yet these results may be conservative in application. The stability analysis of these systems is discussed, and the necessary and sufficient condition of stability is derived by method other than constructing Lyapunov function and solving Riccati inequality. The root locations of system characteristic polynomial, which is obtained by augmentation approach and Laplace expansion, determine the stability of uncertain discrete-time systems with state delay, the system is stable if and only if all roots lie within the unit circle. In order to analyze robust stability of system characteristic polynomial effectively, Kharitonov theorem and edge theorem are applied. Example shows the practicability of these methods. 展开更多
关键词 robust stability state delay uncertain discrete-time system necessary and sufficient condition POLYNOMIAL Hurwitz stability Schur stability.
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ROBUST FILTERS WITH SAMPLED-DATA ESTIMATION COVARANCE CONSTRAINT FOR UNCERTAIN CONTINUOUS-TIME SYSTEMS
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作者 霍沛军 王子栋 郭治 《Journal of Shanghai Jiaotong university(Science)》 EI 1999年第1期39-44,共6页
This paper was concerned with the problem of robust sampled data state estimation for uncertain continuous time systems. A sampled data estimation covariance is given by taking intersample behaviour into account. T... This paper was concerned with the problem of robust sampled data state estimation for uncertain continuous time systems. A sampled data estimation covariance is given by taking intersample behaviour into account. The primary purpose of this paper is to design robust discrete time Kalman filters such that the sampled data estimation covariance is not more than a prespecified value, and therefore the error variances achieve the desired constraints. It is shown that the addressed problem can be converted into a similar problem for a fictitious discrete time system. The existence conditions and the explicit expression of desired filters were both derived. Finally, a simple example was presented to demonstrate the effectiveness of the proposed design procedure. 展开更多
关键词 uncertain SYSTEMS continuous time SYSTEMS ROBUST FILTERS sampled data ESTIMATION covariance intersample behaviour
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Robust Stability Criterion for Uncertain Neural Networks with Time Delays
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作者 林知微 张宁 杨洪玖 《Defence Technology(防务技术)》 SCIE EI CAS 2010年第3期189-193,共5页
The robust stability of uncertain neural network with time-varying delay was investigated.The norm-bounded uncertainties are included in the system matrices.The constraint on time-varying delays is removed,which means... The robust stability of uncertain neural network with time-varying delay was investigated.The norm-bounded uncertainties are included in the system matrices.The constraint on time-varying delays is removed,which means that a fast time-varying delay is admissible.Some new delay-dependent stability criteria were presented by using Lyapunov-Krasovskii functional and linear matrix inequalities(LMIs) approaches.Finally,a numerical example was given to illustrate the effectiveness and innovation nature of the developed techniques. 展开更多
关键词 control theory robust stability neural network time-DELAY uncertain system
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Robust finite-time stabilization of unified chaotic complex systems with certain and uncertain parameters
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作者 刘平 《Chinese Physics B》 SCIE EI CAS CSCD 2013年第7期73-78,共6页
This paper deals with the finite-time stabilization of unified chaotic complex systems with known and unknown parameters. Based on the finite-time stability theory, nonlinear control laws are presented to achieve fini... This paper deals with the finite-time stabilization of unified chaotic complex systems with known and unknown parameters. Based on the finite-time stability theory, nonlinear control laws are presented to achieve finite-time chaos control of the determined and uncertain unified chaotic complex systems, respectively. The two controllers are simple, and one of the uncertain unified chaotic complex systems is robust. For the design of a finite-time controller on uncertain unified chaotic complex systems, only some of the unknown parameters need to be bounded. Simulation results for the chaotic complex Lorenz, Lu¨ and Chen systems are presented to validate the design and analysis. 展开更多
关键词 finite-time stability uncertain parameters unified chaotic complex systems
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Robust H_∞ control for discrete-time polytopic uncertain systems with linear fractional vertices 被引量:2
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作者 ShaoshengZHOU JamesLAM ShengyuanXU 《控制理论与应用(英文版)》 EI 2004年第1期75-81,共7页
The robust H∞ control problem for discrete-time uncertain systems is investigated in this paper. The uncertain systems are modelled as a polytopic type with linear fractional uncertainty in the vertices. A new linear... The robust H∞ control problem for discrete-time uncertain systems is investigated in this paper. The uncertain systems are modelled as a polytopic type with linear fractional uncertainty in the vertices. A new linear matrix inequality (LMI) characterization of the H∞ performance for discrete systems is given by introducing a matrix slack variable which decouples the matrix of a Lyapunov function candidate and the parametric matrices of the system. This feature enables one to derive sufficient conditions for discrete uncertain systems by using parameter-dependent Lyapunov functions with less conservativeness. Based on the result, H∞ performance analysis and controller design are carried out. A numerical example is included to demonstrate the effectiveness of the proposed results. 展开更多
关键词 Discrete-time systems H∞ control Linear matrix inequality uncertain systems
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