具有状态时滞线性系统对时滞参数的自适应控制

对于存在状态时滞的线性时滞系统, 研究了无记忆与带记忆的复合状态反馈控制器的设计问题, 当滞后常数不能精确已知时, 首次提出了对时滞参数的自适应控制方案, 通过解相应的线性矩阵不等式 (LMI)即能求得满足设计要求的对时滞参数自适应控制器. 最后给出了仿真实例以说明结论的有效性.     

线性时滞系统对时滞参数的自适应控制

针对实际中线性时滞系统的时滞常数往往不能精确已知的缺点,对具有状态滞后的线性时滞系统提出一种对时滞常数的自适应控制方案,其控制器存在的充分条件由一个线性矩阵不等式（LMI）的形式给出,并对整个闭环系统的稳定性进行了分析。     

时滞系统关于时滞参数的自适应输出反馈控制

对存在状态时滞的线性时滞系统，给出符合分离性原理的动态输出反馈控制器形式，当时滞参数不能精确已知时，给出基于观测器的关于时滞参数的自适应动态输出反馈控制器设计方案，通过求解两个相应的Riccati型矩阵不等式即可求得满足设计要求的动态输出反馈控制器及关于时滞参数的自适应律，且控制器的存在性与时滞参数精确已知时相同．最后给出了一个应用仿真示例．     

线性时滞系统依赖于时滞的H∞状态反馈控制

对具有纯滞后输入的线性时滞系统,在系统的状态时滞与控制输入时滞不同时,研究了依赖时滞的H∞状态反馈控制器设计问题,其控制器存在的充分条件由一个线性矩阵不等式(LMI)的形式给出,并给出了相应的H∞控制器的综合设计方法.     

线性时滞系统依赖于时滞的H~∞状态反馈控制

对具有纯滞后输入的线性时滞系统 ,在系统的状态时滞与控制输入时滞不同时 ,研究了依赖时滞的 H∞ 状态反馈控制器设计问题 ,其控制器存在的充分条件由一个线性矩阵不等式 (L MI)的形式给出 ,并给出了相应的 H∞ 控制器的综合设计方法     

线性广义时滞系统的状态反馈H∞控制

首先利用线性矩阵不等式(LMI)方法,给出线性广义时滞系统稳定的一个充分条件;然后讨论广义时滞系统的H_∞状态反馈控制,给出控制器存在的充分条件,同时给出控制器的设计.控制器可由矩阵不等式解得。     

不确定离散时滞系统状态预估H∞控制

针对一类线性不确定离散时滞系统,研究了系统的鲁棒稳定性和鲁棒H∞观测控制器的设计问题.在系统状态不能直接测量的情况下,基于线性矩阵不等式方法,通过构造合适的Lyapunov函数,给出了系统新近稳定的充分条件和状态反馈控制器的设计方案,并通过求解相应的线性矩阵不等式得到满足设计要求的控制器.仿真结果表明,所设计的控制器对...     

中立型时滞系统基于状态观测器的控制设计-LMI方法

研究一类中立型时滞系统基于状态观测器的反馈控制问题。目的是利用线性矩阵不等式(LMI)方法设计状态观测器和动态输出反馈控制器,使得相应的闭环系统渐近稳定。最后给出一个数值例子验证了本文所给结果的有效性。     

线性广义时滞系统的H∞状态反馈控制器

首先利用线性矩阵不等式(LMI)方法，给出线性广义时滞系统稳定的一个充分条件；然后讨论线性广义时滞系统的H∞状态反馈控制，给出控制器存在的充分条件，同时给出控制器的设计，控制器可由线性矩阵不等式解得；最后举例说明了所提出方法的可行性。     

基于观测器的不确定广义时滞系统保成本控制

讨论了基于观测器的一类不确定广义时滞系统的保成本控制问题,给出了系统保成本控制器的设计方法.控制器的构造使得闭环系统是鲁棒稳定的.利用线性矩阵不等式以及Lyapunov函数方法,给出了鲁棒保成本控制器存在的充分条件以及相应的可保成本指标,并证明了这个条件等价于一组线性矩阵不等式(LM Is)的可解性问题,同时推广了已知的相关结果.最后以算例验证了设计方法的有效性.     

一类不确定时滞奇异系统的鲁棒非脆弱控制

针对不确定奇异时滞系统，研究了鲁棒非脆弱控制问题。假定不确定性范数有界，设计了基于观测器的控制器，使得闭环系统在不确定性影响下保持鲁棒稳定。仅通过求解相应线性矩阵不等式就可得到鲁棒状态反馈控制器，该控制器不仅对所有容许的系统不确定性使相应的闭环系统渐近稳定，而且满足控制器本身是非脆弱的，达到抑制干扰的效果。     

Adaptive Fault-Delay Accommodation for a Class of State-Delay Systems With Actuator Faults

Fault and delay accommodating simultaneously for a class of linear systems subject to state delays, actuator faults and disturbances is investigated in this work. A matrix norm minimization technique is applied to minimize the norms of coefficient matrix on time delay terms of the system in consideration. Compared with the matrix inequality scaling technique, the minimization technique can relax substantially the obtained stability conditions for state delay systems, especially, when the coefficient matrices of time delay terms have a large order of magnitudes.An output feedback adaptive fault-delay tolerant controller(AFDTC) is designed subsequently to stabilize the plant with state delays and actuator faults. Compared with the conventional fault tolerant controller(FTC), the designed output feedback AFDTC can be updated on-line to compensate the effect of both faults and delays on systems. Simulation results under two numerical examples exhibit the effectiveness and merits of the proposed method.     

Pointwise stabilisation of a string with time delay in the observation

Pointwise stabilisation is proposed in this paper for a string equation where the observation signal is subject to a time delay. Different from the boundary control, the feedback stabiliser is acting at the middle joint of the string. Well-posedness of the open-loop system and solvability of the observer are shown first. An observer system is then designed to estimate the state at the time interval when the observation is available, and a predictor system is designed to predict the state at the time interval when the observation is not available. Pointwise output feedback controller is introduced to make the closed-loop system asymptotically stable for the non-smooth initial values and exponentially stable for the smooth initial values, respectively. Simulation results demonstrate that the output feedback based on the observer and predictor effectively stabilises the pointwise control system with time delay.     

Two‐stage stability control for strict‐feedback systems with input delays and input nonlinear uncertainties

In this paper, a two‐stage control procedure is proposed for stabilization of a class of strict‐feedback systems with unknown constant time delays and nonlinear uncertainties in the input. A nominal controller is first designed to compensate input time delays without considering input nonlinear uncertainties. Extended from backstepping algorithm, input delay compensation is realized by means of predicted states that are computed through integration of cascaded system dynamics, making the nominal closed‐loop system asymptotically stable. Based on the nominal controller presented for the input delay system, a multi‐timescale system is subsequently developed to estimate the unknown input nonlinearity and make the estimate approach the nominal control input as fast as possible. It is proved that the proposed control scheme can make states of the strict‐feedback systems converge to zero and all the signals of the closed‐loop systems are guaranteed to be bounded in the presence of input time delays and nonlinear uncertainties. Simulation verification is carried out to illuminate the effectiveness of the proposed control approach.     

Exponential stabilization controller design for interconnected time delay systems

Decentralized robust control problem is investigated for a class of large scale systems with time varying delays. The considered systems have mismatches in time delay functions. A state coordinate transformation is first employed to change the original system into a cascade system. Then the virtual linear state feedback controller is developed to stabilize the first subsystem. Based on the virtual controller, a memoryless state feedback controller is constructed for the second subsystem. By choosing new Lyapunov Krasovskii functional, we show that the designed decentralized continuous adaptive controller makes the solutions of the closed-loop system exponentially convergent to a ball, which can be rendered arbitrary small by adjusting design parameters. Finally, a numerical example is given to show the feasibility and effectiveness of the proposed design techniques.     

Stability of sampled-data piecewise affine systems: A time-delay approach

This paper addresses the stability analysis of sampled-data piecewise-affine (PWA) systems consisting of a continuous-time plant in feedback connection with a discrete-time emulation of a continuous-time state feedback controller. The sampled-data system is first considered as a continuous-time system with a variable time delay. Conditions under which the trajectories of the sampled-data closed-loop system will converge to an attracting invariant set are then presented. It is also shown that when the sampling period converges to zero, these conditions coincide with sufficient conditions for non-fragility of the stabilizing continuous-time PWA state feedback controller. The results are successfully applied to a helicopter example.     

带有时滞的区间不确定正系统的约束控制

研究具有时变时滞的连续不确定正系统的约束控制问题.基于线性规划方法,首先设计状态反馈控制器使得相应的闭环系统是正系统且渐近稳定;然后建立在正性约束下有界的鲁棒状态反馈控制器存在的充分条件,同时给出控制器的设计方法;最后利用仿真算例验证所提出方法的有效性.