共查询到19条相似文献,搜索用时 187 毫秒
1.
关于不确定对称组合系统的稳定化 总被引:2,自引:0,他引:2
研究不确定对称组合系统的二次稳定化问题,给出这类系统可二次稳定的一些充分条件
及计算反馈控制律的方法.这些条件的检验和反馈控制律的计算都由两个低阶系统关于相应
问题的求解来完成. 相似文献
2.
3.
从全新的二次型供给率的耗散角度,研究了线性时滞系统的二次稳定性和耗散控制问题,给出了线性矩阵不等式(LMI)形式的充分条件。而且,考虑了时滞系统在状态反馈控制器和动态输出反馈控制器作用下的闭环系统的二次稳定和耗散性问题,同样给出了LMI形式的充分条件,并通过线性矩阵不等式的可行解构造出耗散状态反馈控制律和动态输出反馈控制律。 相似文献
4.
广义不确定系统鲁棒稳定性及鲁棒镇定的矩阵不等式方法 总被引:6,自引:1,他引:5
考虑广义不确定系统的鲁棒稳定性及鲁棒镇定问题.提出了广义不确定系统'广义二
次稳定'及'广义二次可镇定'的概念,利用矩阵不等式,分别得到了所考虑广义不确定系统广义
二次稳定及广义二次可镇定的充要条件,而且,使广义不确定系统鲁棒镇定的状态反馈控制律
的设计可通过求解一给定的矩阵不等式而得到. 相似文献
5.
6.
凸锥型不确定线性切换系统的二次镇定 总被引:2,自引:0,他引:2
研究具有凸锥型不确定性的线性切换系统的二次鲁棒稳定化问题.这种不确定性是由若干已知常数矩阵所张成的凸锥构成的.利用凸组合技术,分别给出了连续和离散线性切换系统的鲁棒二次可稳定条件及切换律的设计方法.按照这些条件,只要判断张成凸锥的顶点矩阵的某个凸组合是否可稳即可.最后给出仿真例子. 相似文献
7.
本文研究在模型参数不确定及未知干扰的情况下的车队控制问题,该方法可保证车队系统在有限时间内稳定.针对前车–跟随(PF)、双向(BD)的信息拓扑结构,引入一种新的二次间距策略,保证车队系统的交通流稳定性.然后,提出两种基于非线性终端滑模控制和有限时间理论的分布式协同控制算法,分别保证了系统的队列稳定性和强队列稳定性,同时设计自适应律来处理系统中不确定参数和外源性扰动的影响,通过构造Lyapunov函数分析系统的有限时间稳定性与队列稳定性.最后通过数值仿真结果,证明了所提出的控制算法的有效性.结果表明,本文所提的方法能保证队列稳定性、交通流稳定性、并保证闭环系统中的所有信号都是有限时间稳定的. 相似文献
8.
线性离散时滞系统的鲁棒耗散控制 总被引:2,自引:0,他引:2
考虑线性离散时滞系统的二次型耗散控制问题.对于确定系统,给出渐近稳定且严格二次型耗散的条件和动态输出反馈控制器使闭环系统渐近稳定且严格二次型耗散.对于不确定系统,考虑不确定性具有耗散特性的情形,讨论鲁棒耗散性分析和动态输出反馈鲁棒耗散控制问题.通过构造增广系统,将不确定系统的鲁棒严格二次型耗散分析和设计转化为确定系统的情况.所得结果为离散时滞系统的无源控制和H∞控制提供了统一框架,且为离散时滞系统的分析和设计提供了一种更灵活、保守性更小的方法. 相似文献
9.
中央空调冷水系统管路特性变化、设备老化等因素导致中央空调冷水系统二次泵压差模型具有不确定性,以致常规PID算法的调节性能变差,甚至在空调系统运行一段时间后出现不可控的现象;而无模型自适应控制(Model Free Adaptive Control,MFAC)是一种采用不依赖被控对象的具体数学模型的"泛模型"和一些"控制功能"的某种组合相结合的、具有参数自适应和结构自适应的控制方法;引入了无模型自适应控制算法,来改善中央空调冷水系统二次泵压差控制效果,确保系统的调节时间和超调量保持不变;仿真和实验结果表明:相对于PID控制,MFAC具有很强的鲁棒性和抗干扰能力及自适应能力,调节性能稳定,可以克服由于系统管路特性变化、设备老化等因素导致的中央空调冷水系统二次泵压差模型不确定性的情况,控制效果良好。 相似文献
10.
基于渐近调节的容错控制 总被引:3,自引:1,他引:2
针对线性动态故障系统,提出了一种基于线性二次型问题的容错控制方法,该方法可以通过牛顿一拉普森迭代算法来渐近调节状态反馈控制律,以降低故障系统由于故障诊断和系统重构的延时所产生的运行风险,从而提高系统性能。给出了适用该方法的充分条件,并进一步讨论了该方法在系统能耗方面的优越性,对一个具体航空系统进行了仿真,结果证实了该渐近方法的有效性。 相似文献
11.
12.
This paper discusses a generalized quadratic stabilization problem for a class of discrete‐time singular systems with time‐delay and nonlinear perturbation (DSSDP), which the satisfies Lipschitz condition. By means of the S‐procedure approach, necessary and sufficient conditions are presented via a matrix inequality such that the control system is generalized quadratically stabilizable. An explicit expression of the static state feedback controllers is obtained via some free choices of parameters. It is shown in this paper that generalized quadratic stability also implies exponential stability for linear discrete‐time singular systems or more generally, DSSDP. In addition, this new approach for discrete singular systems (DSS) is developed in order to cast the problem as a convex optimization involving linear matrix inequalities (LMIs), such that the controller can stabilize the overall system. This approach provides generalized quadratic stabilization for uncertain DSS and also extends the existing robust stabilization results for non‐singular discrete systems with perturbation. The approach is illustrated here by means of numerical examples. 相似文献
13.
14.
线性离散时滞系统的输出反馈耗散控制 总被引:4,自引:1,他引:4
考虑线性离散时滞系统的二次型耗散控制问题,设计动态输出反馈使闭环系统渐近稳定且严格二次型耗散.先将系统严格二次型耗散性转化为线性矩阵不等式的可解性,得到了系统渐近稳定且严格二次型耗散的条件.然后讨论输出反馈耗散控制问题,给出了控制器的存在条件,总结出了控制器的综合方法、步骤.所得结果可为离散时滞系统的无源控制和H∞控制提供统一框架,也为离散时滞系统的分析和设计提供了一种更灵活、保守性更小的方法. 相似文献
15.
16.
This paper investigates the quadratic stability and stabilization of a class of matrix second‐order time‐varying systems. All the system matrices including the second‐order differential coefficient matrix are assumed to have the time‐varying norm‐bounded parameters. Necessary and sufficient conditions for the quadratic stability and stabilization of such time‐varying systems are derived. All the results are obtained in terms of linear matrix inequalities. Two illustrative examples are given to show that our results are effective and less conservative than the results obtained by other researchers. Copyright © 2011 John Wiley & Sons, Ltd. 相似文献
17.
Perfect tracking control is an important and frequently encountered requirement in various industries (e.g. robotic control). We developed a novel systematic framework for designing a fuzzy controller via feedback linearisation to control a class of discrete-time Takagi–Sugeno (TS) fuzzy systems with quadratic rule consequents to achieve such tracking. We established a necessary condition for its local stability and a necessary and sufficient condition for the boundedness of the controller. The feedback linearisation is known to fail to work in certain systems due to the unboundedness of the tracking controller output. To address this issue, we developed a method to check whether any given quadratic TS fuzzy system will cause such a failure. We developed a scheme to ensure that the output of the controller designed for any failure-causing system will be bounded and the resulting controller will attain nearly perfect tracking performance. Applying feedback linearisation to the quadratic fuzzy systems is innovative relative to the literature exclusively dealing with the TS fuzzy systems with linear rule consequents (including our previous results), which are now generalised by the new findings. Two numerical examples are provided to illustrate the effectiveness and utility of our new theoretical results. 相似文献
18.
19.
Robust Output Feedback Stabilization of Switched Nonlinear Systems with Average Dwell Time 下载免费PDF全文
Li‐Chen Fu 《Asian journal of control》2014,16(1):264-276
For some switched nonlinear systems, stabilization can be achieved under arbitrary switching with state feedback control. Due to switching zero dynamics, output feedback stabilization for some switched nonlinear systems needs dwell time between switching to guarantee system stability. In this paper, we consider a class of switched nonlinear systems with unknown parameters and unknown switching signals. We design a robust output feedback controller that stabilizes the system under a class of switching signals with average dwell time (ADT) where the value of ADT can be reduced by adjusting the control gain. For some special cases, common quadratic Lyapunov functions of the closed‐loop systems can be found and the value of ADT is further relaxed. Some examples and simulations are provided to validate the results. 相似文献