军用飞机寿命指标使用及控制分析

针对目前航空兵部队在军用飞机使用控制中普遍存在根据经验选用寿命指标的问题,对其寿命指标使用及控制进行分析。从4个常用寿命指标对飞机使用的可靠性影响进行详细分析,给出各自的使用时机。同时,为提高军用飞机使用可靠性和充分发挥其寿命潜力,从控制角度出发,给出使各寿命指标协调一致的控制方案。结果表明：该分析实用、可行,可为相关研究提供一定的参考。     

Robustness of Exact p‐Controllability and Exact p‐Observability to q‐Type of Perturbations of the Generator

In Mei and Peng, Systems & Control Letters, 59 (2010) 470–475, the authors have proved in general setting that p‐admissibilities of control operators and observation operators are invariant to any q‐type of perturbations of generator of C₀‐semigroups on Banach space. In this paper, under the p‐admissibility invariance premise, the robustness of the exact p‐controllability as well as the exact p‐observability to q‐type of perturbations is verified.     

LINEAR SYSTEM CANONICAL FORMS

Several canonical forms are developed for linear, constant, single-input, single-output systems. These canonical forms correspond to the system properties of Controllability, Observability, Reachability, and Constructability and are applicable to the case of continuous systems in which time has been discretized and to the case of linear sequential machines.     

An overview on controllability analysis of chemical processes

Controllability is one of the most important aspects of chemical process operability, because it can be used to assess the attainable operation of a given process and improve its dynamic performance. The purpose of this article is to outline the main methodologies that have been developed to deal with the assessment of process controllability and the improvement of its controllability characteristics. Several existing controllability assessment methods are reviewed and discussed. For improving the controllability characteristic of a process, there are two main design methods: the optimization‐based method and the controllability indices‐based anticipating sequential method. Advantages and disadvantages of these techniques are discussed. It has been emphasized that bifurcation analysis, as a powerful nonlinear analysis tool, could provide important guidance for making processes more controllable by eliminating or avoiding some undesirable behaviors of processes. Further challenges and developments in the field of process controllability are identified. © 2010 American Institute of Chemical Engineers AIChE J, 2010     

挖装机液压控制系统优化设计

根据挖装机的性能要求,分析了节流控制,负载敏感控制和LUDV控制三种阀控方式,得出LUDV控制更适合挖装机。液压泵选择LRCS控制,泵和阀联合控制使挖装机更为高效、节能,操作性能也得到改善。     

集装箱起重机防摇系统状态分析

建立集装箱起重机的抽象模型,通过对模型进行线性简化,得出简化的系统动力学微分方程及其状态空间方程。运用李亚普诺夫定理,对线性化后的起重机系统进行稳定性分析,并运用秩判据原则对简化后系统能控性和能观测性进行判定。通过分析,线性简化后的集装箱起重机防摇系统为渐进稳定系统,且该系统完全能控和能观测。     

非线性稳定无交互控制的例题及反例研究

本文首先给出非线性控制系统的一般稳定无交互控制问题可解的一个一般结论,进而研 究两个例题,其中之一揭示所涉及问题中典型的非线性现象,另一个表明以往一个结论的错 误.     

Stabilization of switched linear systems with bounded disturbances and unobservable switchings

This paper studies the stabilization problem of switched linear systems with bounded disturbances. It is assumed that the system switches among an infinite set of uniformly controllable linear systems, and that the switching signals are not observable, but the switching duration has a lower bound. It will be shown that by combining on-line adaptive estimation and control in the controller design, a feedback control law can be constructed which makes the switched linear system globally stable.     

Decentralized state feedback control of discrete event systems

In this paper, we consider decentralized state feedback control of discrete event systems with a (global) control specification given by a predicate. In this framework, instead of a global state feedback, each local state feedback controls a part of the system according to local information so that global behaviors satisfy the global control specification. We introduce the notion of n-observability of predicates, and present necessary and sufficient conditions for the existence of a decentralized state feedback which achieves the global control specification.     

A graph-theoretic characterization of structurally fixed modes

A characterization of structurally fixed modes in linear systems is given in the graph-theoretic framework. The characterization results in a computationally efficient test for stabilizability of systems under feedback structure constraints.