一类输入为扇区非线性的不确定动力系统的指数镇定

研究一类输入为扇区非线性的不确定动力系统的指数镇定问题,在假设系统不确定性满足匹配条件的情况下,基于Lyapunov稳定性理论给出了一种连续型的鲁棒指数镇定控制器方案,在模型的部分不确定上界未知时修改了控制器,并得出全局渐近收敛的结果。算例仿真结果证实了设计方案的有效性。     

Robust Stability and Stabilization of Positive Interval Systems Subject to Actuator Saturation

This paper addresses the stabilization problem for a class of uncertain positive linear systems (PLSs) in the presence of saturating actuators. The objective is to obtain sufficient conditions for the robust stability of PLSs and to design robust state feedback control laws such that the closed‐loop uncertain system is asymptotically stable and positive at the origin with a large domain of attraction. Several sufficient conditions for robust stabilization and positivity are derived via the Lyapunov function approach and convex analysis method for both the discrete‐time and the continuous‐time cases, respectively. The state feedback controller design and the estimation of the domain of attraction are presented by solving a convex optimization problem with linear matrix inequalities (LMIs) constraints. A numerical example is given to show the effectiveness of the proposed methods.     

具有结构不确定性的线性反馈控制系统的鲁棒稳定性

本文研究了具有结构不确定性(Structured Uncertainty)因素的反馈控制系统的鲁棒稳定性问题,对于一个普通的补偿器,给出了闭环系统鲁棒稳定的充要条件,当补偿器满足某些假设条件时,得出了闭环系统鲁棒稳定的有限检验的充分必要条件.     

考虑执行器饱和的复杂动态网络鲁棒采样切换控制

随着计算机和网络技术的发展,复杂动态网络鲁棒采样切换控制受到广泛关注。探讨了在执行器饱和情况下不确定切换复杂动态网络的非周期采样控制问题。由于采样间隔上限受到停留时间的限制,采样数据控制器模式和系统模式之间的异步问题可能是由采样间隔内切换的子系统引起的。通过考虑无切换的采样间隔和有切换的采样间隔,分别构建了参数相关的李雅普诺夫闭环泛函。在平均停留时间的定义下,借助所构造的泛函,给出了不确定切换复杂动态网络误差系统的均方指数稳定性判据。此外,基于稳定性准则,针对执行器饱和情况下的不确定切换复杂动态网络,设计了全新的异步非周期采样控制器。根据提出的稳定性条件并采用非周期采样控制器设计方法,保证了不确定切换复杂动态网络与目标节点指数同步。最后,将利用蔡氏电路的算例与其他类似方法进行了对比,验证了所提方法的有效性,同时证明了利用所提方法得到的最大允许采样区间较大。     

基于输出反馈的不确定连续系统的鲁棒预测控制

运用线性矩阵不等式方法,研究一类基于输出反馈的线性连续时间范数有界参数不确定系统的鲁棒预测控制问题．基于变量变换的思想,将无限时域“最小—最大”优化问题转化为线性规划问题,得出分段连续的输出反馈控制律,并给出了控制律存在的充分条件,证明了优化问题在初始时刻的可行解保证闭环系统渐近稳定．仿真实例验证了此方法的有效性．     

输入为扇区非线性的不确定系统的鲁棒镇定

讨论一类输入为扇区非线性的不确定系统的渐近镇定问题。在假设系统不确定性满足匹配条件的情况下,基于无源性理论用逻辑切换得到了控制规律,并给出镇定这类系统的一种新的鲁棒控制方法。仿真算例表明该方法具有良好的控制效果。     

区间系统在反馈控制情况下的性能鲁棒性

本文讨论含区间对象的反馈控制系统性能鲁棒性问题，给出了检验区间系统性能鲁棒性的充要条件．当补偿器满足某种假设条件时，给出了闭环系统性能鲁棒性的有限检验结果。在有限检验的前提下，给出了补偿器在系数空间中所应满足的制约条件。     

不确定系统的鲁棒状态反馈区域极点配置

针对一类范数有界参数不确定线性连续系统。研究使得闭环系统的所有极点均配置在给定扇形区域中的状态反馈控制器设计问题。利用线性矩阵不等式（LMI）处理方法,给出不确定线性系统存在鲁棒D控制的充分条件,并利用该LMI的可行解给出状态反馈控制器的设计算法和设计步骤。最后。通过一算例验证结果的正确性和有效性。     

广义离散系统的状态反馈鲁棒H∞控制

针对一类范数有界参数不确定性的广义离散线性系统,研究了该系统的状态反馈鲁棒H∞控制问题。利用线性矩阵不等式（LMI）的方法,得到了问题可解的条件,并给出了相应的状态反馈控制律。在一定条件下,所得的状态反馈鲁棒H∞控制律使广义离散线性系统对所有容许的不确定性参数,能够保证闭环系统正则、具有因果关系并且渐进稳定,同时其传递函数矩阵能够满足给定的H∞性能指标。正常离散线性系统的相对应结果可作为本文结果的特殊形式。     

Robust stabilization of switched discrete-time systems with actuator saturation

This paper studies the robust stabilization problem of switched discrete-time linear systems subject to actuator saturation. New switched saturation-dependent Lyapunov functions are exploited to design a robust stabilizing state feedback controller that maximizes an estimation of the domain of attraction. The design problem of controller （coefficient matrices） is then reduced to an optimization problem with linear matrix inequality （LMI） constraints. A numerical example is given to show the effectiveness of the proposed method.     

Adaptive Sensor-Fault Tolerant Control of Unmanned Underwater Vehicles With Input Saturation

This paper investigates the tracking control problem for unmanned underwater vehicles(UUVs) systems with sensor faults, input saturation, and external disturbance caused by waves and ocean currents. An active sensor fault-tolerant control scheme is proposed. First, the developed method only requires the inertia matrix of the UUV, without other dynamic information,and can handle both additive and multiplicative sensor faults.Subsequently, an adaptive fault-tolerant controller is designed to achie...     

含饱和状态反馈线性离散时间系统渐近稳定性

As saturation is involved in the stabilizing feedback control of a linear discrete-time system, the original global-asymptotic stabilization (GAS) may drop to region-asymptotic stabilization (RAS). How to test if the saturated feedback system is GAS or RAS? The paper presents a criterion to answer this question, and describes an algorithm to calculate an invariant attractive ellipsoid for the RAS case. At last, the effectiveness of the approach is shown with examples.     

具有滞后型执行机构的Lurie控制系统的鲁棒绝对稳定性

本文对于具有滞后型执行机构的不确定性Lurie控制系统，构造了一个关于Lyapunov泛函中自由参数的LMI。通过这个LMI的解来构造Lyapunov泛函保证系统的鲁棒绝对稳定性。在此基础上，获得了保证系统绝对稳定的鲁棒扰动界的LMI，并给出了利用迭代法获得鲁棒扰动界的方法。最后给出一个实例说明本文方法的有效性。     

On Asymptotic Stabilization of Linear Discrete-time Systems with Saturated State Feedback

As saturation is involved in the stabilizing feedback control of a linear discrete-time system, the original global-asymptotic stabilization (GAS) may drop to region-asymptotic stabilization (RAS). How to test if the saturated feedback system is GAS or RAS? The paper presents a criterion to answer this question, and describes an algorithm to calculate an invariant attractive ellipsoid for the RAS case. At last, the effectiveness of the approach is shown with examples.     

基于输出反馈的不确定NCS鲁棒容错控制

研究了一类具有网络诱导时延和参数不确定性网络化控制系统鲁棒容错控制问题.基于将时延的不确定性转换为系统状态方程系数矩阵不确定性的NCS模型,同时考虑系统参数不确定性对系统的影响,应用Lyapunov稳定性理论和LMI方法,采用输出反馈控制策略,推证出了保证闭环网络化控制系统在执行器或传感器发生故障时仍渐进稳定的充分条件,并以求解线性矩阵不等式组给出了容错控制器的设计方法,最后用仿真算例验证了此方法的可行性和有效性.     

Robust Control for Uncertain Nonlinear Feedback Systems Using Operator-based Right Coprime Factorization

The robust control issue for uncertain nonlinear system is discussed by using the method of right coprime factorization. As it is difficult to obtain the inverse of the right factor due to the high nonlinearity, the proving of the Bezout identity becomes troublesome. Therefore, two sufficient conditions are derived to manage this problem with the nonlinear feedback system as well as that with the uncertain nonlinear feedback system under the definition of Lipschitz norm. A simulation of temperature control is given to demonstrate the validity of the proposed method.      

不确定时滞系统时滞相关鲁棒镇定

文章研究了线性不确定时滞系统的时滞相关反馈镇定问题。基于系统的状态反馈给出系统可反馈镇定的控制规律。利用线性矩阵不等式(LMI)给出了系统可反馈镇定的充分条件,最后用实例验证了所得结论的正确性。     

不确定系统的鲁棒输出反馈区域极点配置

对一类具有范数有界参数不确定性的线性系统, 研究了使得闭环系统的所有极点均位于一给定圆盘中的输出反馈控制器设计问题. 采用线性矩阵不等式处理方法, 证明了该问题等价于一个线性矩阵不等式的可解性问题, 并利用该线性矩阵不等式的可行解给出了输出反馈控制器的构造方法. 所提出的方法既可应用到连续系统, 也可应用到离散系统.     

饱和约束下NNCS鲁棒容错少保守性判据与设计

对执行器饱和约束与故障情形下不确定非线性网络化控制系统(NNCS)的鲁棒H∞容错设计问题进行了研究。为了获得少保守性判据准则,构造了适当的时滞依赖Lyapunov-Krasovskii(L-K)泛函,采用了一种下界比常用Jensen积分不等式更紧的改进型Wirtinger积分不等式,推导出了使执行器饱和闭环故障NNCS具有鲁棒H∞容错性能的少保守性判据,并通过求解LMIs的方式给出了鲁棒容错控制器的设计方法。最后,通过仿真算例验证了所提方法的有效性,进而又求取了最大允许时延及最小扰动抑制率,并与已有类似结果进行比较,揭示了本方法所得结论的少保守性;另外,所提方法由于亦未引入除L-K泛函以外的决策变量,因此具有较低计算复杂度。     

Robust Stability For Uncertain Discrete Singular Systems With State Delay

A computationally simple stability condition for discrete singular systems with state delay is presented in this paper. Based on this, a robust stability result for such systems with structured parametric uncertainties is given. This condition ensures that, for all admissible uncertainties, the system under consideration is regular, causal and stable. Then D‐stability results for discrete singular delay systems are obtained. All the proposed conditions are easy to test.