闭环系统故障诊断技术综述

本文着眼于闭环环境下动态系统中的故障诊断问题.介绍了目前闭环系统故障诊断的研究意义, 特别关注了开闭环故障诊断的不同,并概述了现有的闭环系统故障诊断方法. 通过仿真实验比较了典型开环系统和闭环系统中故障诊断的不同性能.最后探讨了闭环系统故障诊断研究中 亟待解决的问题以及未来可能的研究方向.     

离散非线性系统开闭环P型迭代学习控制律及其收敛性

本文在讨论了一般开环与闭环迭代学习控制的不足后，针对一类离散非线性系统，提出了新的开闭环ＰＧ型迭代学习控制律，给出了它的收敛性证明，仿真结果表明：开闭环Ｐ型迭代律优于单纯的开环或产才环Ｐ型迭代 律。     

非线性系统开闭环PID型迭代学习控制算法的鲁棒性

针对非线性时变系统的迭代学习控制问题提出了一种开闭环PID型迭代学习控制律,并证明了系统满足收敛条件时,具有开闭环PID型迭代学习律的一类非线性时变系统在动态过程存在干扰的情况下控制算法的鲁棒性问题.分析表明,系统在状态干扰、输出干扰和初态干扰有界的情况下跟踪误差有界收敛,在所有干扰渐近重复的情况下可以完全地跟踪给定的期望轨迹.     

非线性时变系统开闭环P型迭代学习控制的收敛性

对于非线性时变系统,给出了其开闭环P型迭代学习控制收敛的充要条件.这些收 敛条件与被控系统状态方程的具体形式无关.对比表明,该文的结论改进了现有结果.     

基于2_D系统理论的变初始条件线性系统的开闭环学习控制

对于具有重复运动特性的系统,迭代学习控制是一种简便且行之有效的方法.考虑到系统每次运行初始值的不确定性,利用二维系统理论设计了开闭环迭代学习控制器,并给出了控制收敛的充分条件.用仿真试验验证其有效性.     

非线性系统开闭环PI型迭代学习控制律及其收敛性

对于一类参数未知的非线性系统在有奶时域上的精确轨迹跟踪问题，提出了一种开闭环ＰＩ型迭代学习控制策略，给出了其收敛的充要条件，分析表明：所给出的收敛条件推广了现有结果。     

电容式微陀螺自适应闭环驱动系统的研究

对微陀螺闭环驱动系统理论进行分析讨论,结合微陀螺结构特性和自适应锁相环特点,设计一种微陀螺自适应闭环驱动系统。利用数学工具Matlab分别建立Simulink传统的自动增益控制器（AGC）方式闭环驱动系统模型和自适应闭环驱动系统模型,对其进行系统性能对比分析。分析结果表明：微陀螺自适应闭环驱动系统建立时间比传统AGC方式闭环驱动系统建立时间缩短69％,系统频率偏差仅为1Hz,频率稳定性是传统闭环驱动系统的38．46％,系统抗噪声能力优于传统闭环驱动系统。因此,采用自适应闭环驱动系统可以提高微陀螺的检测灵敏度。     

面向应用领域的操作系统开发模型研究

基于系统评估标准驱动系统软件开发的基本思想,提出了一种新型系统软件开发闭环模型。与传统的闭环模型不同,系统软件开发的闭环模型通过研究特定领域内应用行为的共性并指导操作系统的开发设计,从而达到提高操作系统在该应用领域内的产出率。     

迭代学习控制系统的鲁棒收敛性分析(英)

本文提出一种开闭环配合的滤波器型选代学习控制算法，并将这种算法应用于一般非线性动态系统的轨迹跟踪．对于渐近重复初始条件和渐近周期干扰的情形，通过控制误差估计和输出误差估计，文中分别证明了学习过程的一致收敛性．证明中未采用线性化手段．     

参数化不确定非线性系统的鲁棒控制

首次用鲁棒控制的方法解决参数化反馈型非线性系统的输出调节问题,利用递推方法设计了鲁棒控制器。所得控制器既能保证所有闭环系统信号的全局有界性,又能使闭环系统输出任意小,其一大优点是能对闭环系统的过渡响应进行分析。     

二次型最优离散系统的两个必要条件

本文给出了线性定常二次型最优离散系统的两个必要条件,得到了单输入单输出系统开环特征多项式系数a_i和最优闭环特征多项式系数b_i与权阵Q之间的直接关系,所得结论有益于设计一个具有指定闭环极点的最优控制系统。     

Controllability and stability of a second-order hyperbolic system with collocated sensor/actuator

A second-order hyperbolic system with collocated sensor/actuator is considered. The semigroup generation is shown for the closed-loop system under the feedback of a generic unbounded observation operator. The equivalence between the exponential stability of the closed-loop system and exact controllability of the open-loop system is established in the general framework of well-posed linear systems. Finally, the conditions are weakened for the diagonal semigroups with finite dimensional inputs. Example of beam equation is presented to display the application.     

Regular linear systems with feedback

We consider a rather general class of infinite-dimensional linear systems, called regular linear systems, for which convenient representations are known to exist both in time and in the frequency domain. We introduce and study the concept of admissible feedback operator for such a system and of well-posedness radius. We show that the closed-loop system obtained from a regular linear system with an admissible feedback operator is again regular and we describe the relationship between the generating operators of the open-loop and closed-loop systems.Part of the results reported here were obtained while the author was visiting FUNDP Namur, under the Belgian Program on Inter-University Poles of Attraction initiated by the Belgian state, Prime Minister's Office, Science Policy Programming. The scientific responsibility is assumed by the author.     

Reduced-order observer-based control design for nonlinear stochastic systems

In this paper, we investigate the stabilization control design problem of nonlinear stochastic SISO systems in strict-feedback form. By introducing a novel reduced-order observer, an output-feedback-based control is constructively designed, which renders the closed-loop system asymptotically stable in the large when the nonlinearities and stochastic disturbance equal zero at the equilibrium point of the open-loop system, and bounded in probability, otherwise. Besides, the obtained controller preserves the equilibrium point of the open-loop nonlinear system.     

Limitations of feedback properties imposed by open-loop right halfplane poles

An integral constraint on the closed-loop transfer function of unstable open-loop systems is used to quantify a tradeoff between feedback properties of the closed-loop system. This results in a lower bound on the peak of the complementary sensitivity function for unstable plants. The lower bound illustrates the nature of the tradeoff that is imposed, and provides insight into the difficulties imposed on the control of unstable systems. It can be used to quantitatively evaluate tradeoffs between the frequency of the open-loop unstable pole, the peak of the complementary sensitivity functions, and the bandwidth of the closed-loop system. Such a relationship has long been recognized, and is embodied in the classical design rule of thumb which states that the closed-loop bandwidth must be at least twice as large as the frequency of the unstable pole. Results which give insight into this rule and a theoretical basis for it are provided     

输入饱和系统的离散增益调度控制及其在在轨交会中的应用

基于参量Lyapunov方法和不变集理论,针对具有输入饱和非线性约束的线性系统,提出了一种离散增益调度控制方法. 通过逐渐 增大代表闭环系统收敛速率参数的值,所提出的离散增益调度控制方法逐步加快闭环系统的收敛速度,达到改善闭环系统 动态性能的目的. 如果开环系统是非指数不稳定的,则所提出的离散增益调度控制器可实现半全局镇定;反之可实现局部镇定,并均可保证闭环系统的指数稳定性. 最后,将 所提出的方法应用于空间合作目标在轨交会控制系统的控制器设计,并直接在原始非线 性系统模型上进行仿真,结果验证了所提方法的有效性.     

气动式可靠性强化振动台单锤控制系统研究

研究了一气动式振动台单锤开环控制系统,为实现单锤以及多锤闭环控制系统奠定了一定的基础,对我国开展气动式振动台的研发具有一定的参考价值。     

Receding horizon control of nonlinear systems

The receding horizon control strategy provides a relatively simple method for determining feedback control for linear or nonlinear systems. The method is especially useful for the control of slow nonlinear systems, such as chemical batch processes, where it is possible to solve, sequentially, open-loop fixed-horizon, optimal control problems online. The method has been shown to yield a stable closed-loop system when applied to time-invariant or time-varying linear systems. It is shown that the method also yields a stable closed-loop system when applied to nonlinear systems