共查询到19条相似文献,搜索用时 187 毫秒
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研究了一类具有范数有界不确定性中立时滞系统的鲁棒H∞控制问题。利用线性矩阵不等式(LMI)方法,给出了在状态反馈作用下,不确定中立时滞系统鲁棒可镇定且具H∞范数界的充分条件。并且基于此条件给出了无记忆状态反馈鲁棒H∞控制器设计方法。鲁棒H∞控制器保证闭环系统鲁棒稳定且满足给定的H∞范数约束条件,并可通过求解相应的线性矩阵不等式(LMI)得到。最后,数值算例说明了方法的可行性。 相似文献
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讨论了一类具有Markov跳跃参数的不确定混合线性系统的滑模控制问题.通过线性矩阵不等式方法,给出了系统在滑模面上均方意义下指数稳定的充分条件.当匹配参数不确定项范数上界未知时,提出了一种参数自适应滑模控制器,确保系统的运动轨迹在有限时间内到达滑模面并一直保持在滑模面上.仿真结果表明,所设计的自适应滑模控制器对匹配参数不确定性具有的鲁棒性. 相似文献
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Zhiguo Xu Lin Zhao 《International Journal of Adaptive Control and Signal Processing》2021,35(12):2406-2422
In this article, the problem of output feedback tracking control for uncertain Markov jumping nonlinear systems is studied. A finite-time control scheme based on command filtered backstepping and adaptive neural network (NN) technique is given. The finite-time command filter solves the problem of differential explosions for virtual control signals, the NN is utilized to approximate the uncertain nonlinear dynamics and the adaptive NN observer is applied to restructure the state of system. The finite-time error compensation mechanism is established to compensate the errors brought by filtering process. The proposed finite-time tracking control algorithm can ensure that the solution of the closed-loop system is practically finite-time stable in mean square. Two simulation examples are employed to demonstrate the effectiveness of the proposed control algorithm. 相似文献
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利用降维状态观测器离散系统的鲁棒容错控制 总被引:1,自引:0,他引:1
研究了线性离散不确定系统的鲁棒容错控制问题。针对线性离散控制系统存在不确定性和传感器失效的情况,利用降维观测器估计系统的状态,并基于估计的状态构成鲁棒容错控制律。给出了闭环系统具有鲁棒容错特性的充分条件。数值算例表明了算法的有效性。 相似文献
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Ronghao Wang Jianchun Xing Zhengrong Xiang 《International Journal of Adaptive Control and Signal Processing》2021,35(9):1824-1841
In the framework of asynchronous control, finite-time stabilization and finite-time bounded stabilization of linear time-varying (LTV) switched systems are investigated. A necessary and sufficient condition for finite-time stability (FTS) of LTV switched systems is proposed based on differential matrix inequalities (DMIs). Moreover, we extend the FTS result to the case of finite-time boundedness (FTB), and present a sufficient condition of FTB for LTV switched systems using the average dwell time method which can be used for design proposes. Then we turn to the design problem of asynchronously switched control to guarantee FTS or FTB of LTV switched systems and give a sufficient condition for the state feedback stabilization in the form of nonlinear DMIs (NDMIs). A numerical method is proposed to solve NDMIs approximately. Finally, two examples are given to illustrate the validity of the results. 相似文献
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Jiling Ding Weihai Zhang 《International Journal of Adaptive Control and Signal Processing》2021,35(9):1754-1767
The trajectory tracking control problem for a class of nonlinear systems with uncertain parameters is considered in this article. A new adaptive finite-time tracking control is designed based on the adaptive backstepping method via the command filters. The command filter mechanism can avoid the calculation of partial derivatives and solve the “explosion of complexity” in the backstepping design. The compensation signals are introduced to eliminate errors produced by the command filters. The proposed adaptive backstepping control can guarantee the tracking error remains in a small neighborhood of the origin in finite time, while the practical finite-time stability of the control systems with uncertain parameters is proven by the stability criterion. The effectiveness of the proposed scheme is verified by some simulation results. 相似文献
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Ke Xu Huanqing Wang Haikuo Shen 《International Journal of Adaptive Control and Signal Processing》2023,37(1):145-167
In this paper, an observer-based adaptive neural output-feedback control scheme is developed for a class of nonlinear stochastic nonstrict-feedback systems with input saturation in finite-time interval. The mean value theorem and the property of the smooth function are applied to cope with the difficulties caused by the existence of input saturation. According to the universal approximation capability of the radial basis function neural network, it will be utilized to compensate the unknown nonlinear functions. Based on the state observer, the finite-time Lyapunov stability theorem, we propose an adaptive neural output-feedback control scheme for nonlinear stochastic systems in nonstrict-feedback form. The developed controller guarantees that the system output signal can track the given reference signal trajectory, and all closed-loop signals are semi-globally finite-time stability in probability. The observer errors and the tracking error can converge to a small neighborhood of the origin. Finally, simulation results demonstrate the effectiveness of the developed control scheme. 相似文献
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Yunchang Huang Jianhui Wang Kemao Ma Wenqiang Wu 《International Journal of Adaptive Control and Signal Processing》2020,34(9):1182-1198
In this article, a novel fuzzy adaptive finite-time nonsmooth controller is developed to handle the finite-time tracking problem for a class of uncertain nonlinear systems. Different from traditional fuzzy adaptive approximation methods, proposed method contains only one adaptive parameter, no matter how many states there are in the system. By constructing a new Lyapunov function with prescribed performance bound, the transient and steady performances of control system can be ensured. Further, based on a criterion of finite-time semiglobal practical stability and backstepping technology, a novel fuzzy adaptive finite-time nonsmooth control method is designed. It can be demonstrated that proposed control can effectively ensure tracking error tends to small neighborhood in a finite time. Finally, two examples have been simulated by the proposed control method, and it shows effective tracking performance. 相似文献
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超级电容/锂动力双电船舶中存在着众多级联的电力电子装置和闭环控制的负载变换器,它们都可被视为恒功率负载,其负阻抗特性会放大系统的不稳定,甚至导致整个系统无法正常工作。针对这一问题,提出一种新型有限时间控制器。首先,构建双电船舶直流电力推进系统的数学模型,介绍用于混合发电单元的比例/积分下垂控制。然后,基于有限时间控制理论设计了含双曲正切函数的新型有限时间控制器,通过所设计的有限时间观测器对各类扰动进行观测,并由控制器进行补偿。最后,搭建仿真模型及实验平台,其结果表明,所提控制器可以在保证混合发电单元对母线电压波动分频响应的同时,提高系统带恒功率负载时的大信号稳定性。 相似文献
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Peng Sun Xiaona Song Shuai Song Vladimir Stojanovic 《International Journal of Adaptive Control and Signal Processing》2023,37(3):771-789
This article investigates the composite adaptive fuzzy finite-time prescribed performance control issue of switched nonlinear systems subject to the unknown external disturbance and performance requirement. First, by utilizing the compensation and prediction errors, the piecewise switched composite parameter update law is employed to improve the approximation accuracy of the unknown nonlinearity. Then, the improved fractional-order filter and error compensation signal are introduced to cope with the influences caused by the explosive calculation and filter error, respectively. Meanwhile, the effect of the compound disturbances consisting of the unknown disturbances and approximation errors is reduced appropriately by designing the piecewise switched nonlinear disturbance observer. Moreover, stability analysis results prove that the proposed preassigned performance control scheme not only ensures that all states of the closed-loop system are practical finite-time bounded, but also that the tracking error converges to a preassigned area with a finite time. Ultimately, the simulation examples are given to demonstrate the effectiveness of the proposed control strategy. 相似文献