On the Synthesis of Optimum Linear Feedback Control Systems

Standard forms are presented which define transfer functions for optimum type 1 and type 2 feedback control systems, where systems with minimum integral of time multiplied absolute value of error in the presence of a step displacement input are considered to be optimum. The ITAE criterion adopted in this paper was previously introduced by Graham and Lathrop.The optimization procedure leading to the standard forms presented here, is based upon an all digital simulation coupled to an unconstrained optimization algorithm to minimize the ITAE criterion value.It is shown with the aid of examples how actual systems can be compensated by use of appropriate standard forms to obtain optimum responses.     

有界动态随机系统的观测器设计

提出了用于有界动态随机系统的状态观测器设计方法.首先利用平方根B样条逼近系统的输出概率密度函数来构造残差,同时利用李亚普诺夫函数方法得到观测器增益的自适应调节规律,然后提出了新的对数B样条逼近模型并设计了新的自适应观测器,两个仿真例子表明了方法的有效性.     

随机时滞非线性系统状态反馈镇定

针对一类严格反馈随机时滞非线性系统，提出了一种状态反馈镇定方案。在系统非线性函数满足线性增长条件的假设下，基于反推技术和占优方法设计了一个无记忆线性状态反馈控制器。通过构建一个四次Lyapunov-Krasoviskii泛函，证明了闭环系统在概率意义下全局渐近稳定，仿真实例说明了方案的可行性。     

A Global Energy Theorem for Linear Systems

A fundamental theorem and inequalities were derived earlier by the author describing arithmetic-geometric means and convex behaviour of the active energy dissipated by arbitrary linear reciprocal passive systems. These results are extended to give a new global theorem concerning bounds of energy for arbitrary linear active or passive, reciprocal or non-reciprocal systems.     

Analysis of Nonlinear Systems with Stochastic Input and Stochastic Parameters

This paper gives an extension of the Volterra-functional method to the analysis of nonlinear systems with both stochastic input and stochastic parameters. In Section II, first-order linear systems with stochastic input and stochastic parameter are analyzed. Certain definitions and symbolic relations are established. A special example in which the stochastic input and the stochastic parameter are closely related is given in Appendix I. Section III deals with the analysis of first-order nonlinear systems with both stochastic input and stochastic parameter, by means of the Volterra-functional method. A simpler analysis by extension of the Transform-ensemble method is given in Appendix II. Section IV presents the detailed analysis of nonlinear stochastic systems with four illustrative examples. The analysis can be extended to a class of nonlinear stochastic systems with higher-order linear plants with constant or time-varying parameters.     

随机连续系统基于Laguerre多项式逼近的Markov参数估计

先讨论基于Ｌａｇｕｅｒｒｅ多项式逼近、有连续Ｗｉｅｎｅｒ过程扰动的随机连续线性系统最小二乘参数估计，然后讨论Ｗｉｅｎｅｒ过程的Ｌａｇｕｅｒｒｅ多项式逼近值的相关性和最小二乘估计的有偏性，在此基础上，提出无偏一致的Ｍａｒｋｏｖ估计（最小方差估计）算法，仿真结果显示本文方法的有效性．     

The Normal Family of Linear Systems

The normal family of linear (time-variant) n-ports is introduced as the most natural extension of ordinary scalar driving-point immittance behaviour. The normality induces a certain symmetry and simplicity which merits due emphasis in future n-port research investigations. As an application of the concept of normality the overdamped-underdamped criterion is extended to n-ports. Also, an interesting problem of maximal power transfer is solved and the absolute energy invariant index calculated. This paper invites attention to the development of circuit synthesis procedures based on the algebraic structure of the normal family.     

Overdamped and Underdamped Linear Dynamical Systems

Conditions are given for underdamped or overdamped linear dynamical systems in terms of loop matrix parameters, (√(C)R√(C)g,g)² ? 4(√(C)L√(C)g,g) for all [boxV]g[boxV] = 1, g ∈ H. These criteria are looked upon as natural generalizations of the elementary one-loop RLC series scalar criteria (R/2L)² ? 1/LC, when written in the more suggestive form: (√(C)R√(C))² ? 4√(C)L√(C). A simplified test for determining dynamical systems with all complex natural modes or all real modes are presented with additional comments.     

平衡损失下一般随机效应模型中线性估计的可容许性

主要研究了一般随机效应模型中线性估计可容许性的问题.在平衡损失下,引入了齐次与非齐次线性估计类中线性估计可容许的概念,分别得到了齐次线性估计(非齐次线性估计)在齐次线性估计类(非齐次线性估计类)中可容许性的充分必要条件.     

体制论

本文系统地论述了体制的概念、性质、类型等理论问题，还从系统科学的角度分析了体制与机制的关系，并提出了体制改革应遵循的若干基本原则     

Two Time-Scale Feedback Stabilization of Linear Time-Varying Singularly Perturbed Systems

The stabilization of a class of singularly perturbed linear time-varying systems is considered through the separate stabilization of two lower dimensional subsystems in two different time-scales. A composite stabilizing controller is synthesized from the separate stabilizing controllers of the two subsystems, the mutually independent gains of which do not require knowledge of the small singular perturbation parameter.     

Shifted-Jacobi Series Analysis of Linear Optimal Control Systems Incorporating Observers

This paper uses the Jacobi series to analyze linear optimal control systems incorporating observers. The method simplifies the system of equations into the successive solution of a set of linear algebraic equations. An illustrative example is included to demonstrate that only a small number (m = 6) of shifted-Jacobi series are needed to obtain an accurate solution.     

Output Sensitivity Analysis of Time-invariant Linear Systems Using Polynomial Series

A new approximate method is proposed for the determination of the output sensitivity function of linear time-invariant systems using polynomial series expansions. The novelties of the proposed method are the use of the operational matrix of differentiation for the derivation of the algebraic equations approximating the differential equation, and the use of the operational matrix of polynomial series transformation, for the simplification of the computer code. The approach appears to be more direct and computationally simple than other presently known techniques.     

基于本体的信息系统引论

Since Tim Bemers-Lee, current W3C chairman, first proposed the concept of Semantic Web, it is be-coming a hot topic in computer information processing area. Ontologies are playing a key role in the Semantic Web, ex-tending syntactic interoperability to semantic intemperability by providing a source of shared and precisely defined terms.The paper analyzes the requirement of information systems for ontology languages. The current popular ontology languages are also discussed.     

On A Class of Describing Functions for Dyadic Systems

This paper presents a theory of Sal Input Describing Function (SIDF) for the characterisation and analysis of a class of nonlinear dyadic systems. The SIDFs are determined for single input as well as dual input dyadic elements. The theory is applied to evaluate output response of a closed loop system subjected to sal input functions.     

基于微分包含的约束非线性系统显示预测控制

提出了一种非线性预测控制的新方法.首先基于线性微分包含理论,利用泰勒级数对系统进行线性化,通过对偏导数取最大和最小的方法构造多面体描述的线性时变系统包裹原非线性系统,然后对于多面体描述的线性不确定系统,采用多参数规划的方法建立显示模型预测控制系统.对该方法进行了仿真计算,仿真结果表明采用这种方法可以更好的描述非线性系统...     

论现代操作系统

本文介绍了操作系统的基本知识,包括视图、特征、功能和结构。     

企业可持续技术创新随机过程模型研究

通过实现可持续技术创新企业的实例分析，发现企业可持续技术创新短期呈现平稳的量变过程，但是从长期来看，呈现一个由量变到质变的阶跃上升轨迹，而且这一轨迹可近似用泊松过程来描述。