Some new properties of the structured singular value

J.C. Doyle et al. (1982) have shown that a necessary and sufficient condition for robust stability or robust performance in the H^∞-frame work may be formulated as a bound on the structured singular value (μ) of a specific matrix M which includes information on the system model, the controller, the model uncertainty, and the performance specifications. Often it is desirable to express the robust stability and performance conditions as norm bounds on transfer matrices (T) which are of direct interest to the engineer, e.g. sensitivity or complementary sensitivity. The present paper shows how to derive bounds on σ(T) from bounds on μ(M)     

Some characteristic features of optimal control problems in economic theory

This paper formulates the system equations, state and control space constraints, and a criterion functional for an elementary example of a problem in economic growth, and discusses some further interpretation of the underlying economic structure. Several examples are presented to illustrate particular features of control problems in economics; references to futher examples, and to more general work in mathematical economics, are cited.     

Some properties of the dual adaptive stochastic control algorithm

The purpose of this paper is to compare analytically the properties of the suboptimal dual adaptive stochastic control with those of the optimal control, when plant dynamic contain multiplicative white noise parameters. A simple scalar example is used for this analysis.     

Some qualitative properties of sampled-data control systems

The authors consider sampled-data control systems which consist of an interconnection of a continuous-time nonlinear plant and a digital controller which has quantizers (but is otherwise linear), along with the required interface elements (A/D and D/A converters). In the present paper the authors study the qualitative effects of the quantizers and the plant nonlinearities of these systems     

New system theory and its impact on control theory

Real systems can include two types of state variables – dynamic and static. While dynamic state variables are a common part of each system, static variables are not and their presence in a system may cause some problems if standard system theories are used. In this paper, it is shown that, due to a new system theory (NST), it is possible to work correctly with systems and subsystems which include not only dynamic state variables, but also static state variables. If standard system theories are used, static variables in the real system cause not only problems in describing systems but also some challenges in control theory. These challenges involve, for example, some questions of controllability, reachability, or observability of a plant that includes static variables or the optimal control design of a plant that includes statical state variables. Some of the challenges mentioned are addressed in this paper after a brief introduction of the NST.     

变风量空调自动控制理论的探讨

通过解析变风量空调末端设备的控制特性,为变风量空调系统的自控设计和决定其控制策略提供了理论依据。本文首先通过分析VAV风阀的工作流量特性对控制和节能的影响,指出了优化风阀阀权度的重要性。通过分析送风温度控制对控制能力的影响,指出了变送风温度控制的必要性。通过分析异程风道对VAV风阀的工作流量特性的影响,指出了异程同阻设计的重要性。通过分析风机动力形变风量末端装置的特性,指出了其优缺点。同时,还介绍了数值控制技术在改善VAV风阀的工作流量特性上的应用。     

工业控制计算机系统中若干问题的研究

伴随着现代化信息技术的高速发展,控制系统愈来愈成为网络与控制相结合的系统,关于这一领域的研究也成为一个前沿的课题.尤其是对于工业领域来说,计算机的应用将会带动其发生巨大的变革,从而朝着更为长远的方向发展.本文立足于这一现状展开讨论,并结合计算机在工业控制装置的应用过程当中产生的问题进行深入研究,进而提出相应的策略.     

Some qualitative properties of multirate digital control systems

The authors consider multirate digital control systems which consist of an interconnection of a continuous-time nonlinear plant (described by ordinary differential equations), a digital controller (described by ordinary difference equations) which has quantizers (but is otherwise linear), along with the required interface elements (A/D and D/A converters). The input to the digital controller consists of the multirate sampled output of the plant. In the present paper, the authors show that when quantizer nonlinearities are neglected, then under reasonable conditions (which exclude the critical cases), the stability properties (in the Lyapunov sense) of the trivial solution of a nonlinear multirate digital control system can be deduced from the stability properties of the trivial solution of its linearization. For such systems we also present a result concerning the existence and construction of stabilizing multirate-output digital controllers. In the present paper, the authors also show that the solutions of a multirate digital feedback control system with nonlinear plant and quantizers are uniformly ultimately bounded if the trivial solution of the corresponding linear system consisting of the linearization of the plant and with the quantization removed from the digital controller is asymptotically stable. We also provide a result which compares the response of multirate digital control systems with nonlinear plant and quantizers in the controller with the response of the corresponding nonlinear multirate digital control systems without quantizers in the digital controller     

模糊控制理论在绗缝机控制系统中的应用

模糊控制理论具有许多传统控制方法所无法比拟的优点,因此被广泛地应用于设备控制领域,取得了很大的成功.在此针对绗缝机运动系统的特点,设计了一种模糊控制方案.该方案采用插补速度模糊控制器替代传统的PID控制.主要介绍这种插补速度模糊控制器的基本设计思想,并对整个绗缝机控制系统的工作原理做了介绍.     

鲁棒控制理论应用于宏观经济系统分析

针对宏观经济系统模型的不确定性，运用鲁棒控制理论进行宏观经济系统的分析与决策，使得宏观经济系统能够保持鲁棒稳定性并准确跟踪预先给定的目标。     

基于控制理论的工业控制系统入侵防御方法

工业控制系统随时都面临遭到攻击的风险,为了保障其安全可靠的运行,文章在前人提出的入侵防御系统的基础上做出了改进,简化了原本的防御逻辑流程,提高了入侵防御的效率,并以时间为自适应目标,突出了时间在工业控制系统中的重要性,提出了一种基于控制理论的工业控制系统入侵防御方法。然后用UPPAAL对其建模,分别验证了其安全性、可达性、活性,充分证明了该基于控制理论的工业控制网络入侵防御系统是高效可行的。     

收缩理论在系统控制中的发展及应用

收缩理论作为一种区别于Lyapunov理论的非线性系统分析方法,它主要基于微分几何和流体力学的知识发展而来,为系统控制提供了新颖视角和理论工具.首先,介绍收缩理论的一些基础知识,以及收缩系统的联合、部分收缩理论和控制收缩度量等重要结果;然后,综述收缩理论在分析系统稳定性、跟踪控制、协同控制、状态估计以及学习控制等领域的应用现状;最后,对收缩理论的未来发展趋势进行展望.     

A new control approach using the inverse system

A novel control scheme is presented. It utilizes the inverse system concept along with the basic structure of the conventional model following control scheme. It is a direct approach that does not involve any optimization and is simple to apply. The scheme is illustrated by several examples. An extension of this scheme to adaptive control is suggested and areas for further research are indicated.     

量子分子动力学中的操纵技术及其系统控制理论

回顾了量子操纵技术在分子化学动力学控制中的发展历程及其技术的分类与效果,并就不同操纵技术的原理以及实现上的特点进行了分析和对比,其中包括:频域中的π脉冲动力学法和干涉路径控制方案,时域中的激光脉冲成型操纵技术,继而对宏观控制理论在分子化学动力学控制中的发展状况给予逐一的阐述及评价,包括系统建模、分析与综合、几何控制、幺正演化矩阵控制、最优控制、基于李雅普诺夫方法的控制等.对全面了解量子化学中动力学操纵技术及其控制理论的应用提供一个全方位的综述.     

Impulsive control of a new chaotic system

Based on the new comparison theorem of impulsive system, this paper derives some sufficient conditions for the stabilization and synchronization of a new chaotic system via impulsive control with varying impulsive intervals, the new chaotic system is a three-dimensional continuous autonomous chaotic system, which can display complex two- and four-scroll attractors in simulations.     

A new approach to synthesis problems in linear system theory

We consider a rational nonlinear equation which is involved in the general synthesis (design) problem of linear multivariable systems. The complete solution of this equation, subject to causality, stability, and minimality constraints, is provided. Formal power series and, in particular, the theory of partial realizations, prove of central importance for the design problem.     

Some applications of randomized algorithms for control system design

In this paper a few “difficult” problems related to simultaneous stabilization of three plants (equivalent to a certain problem related to unit interpolation in H_∞) have been addressed through the framework of randomized algorithms. These problems which were proposed by Blondel (Simultaneous Stabilization of Linear Systems, Springer, Berlin, 1994) and Blondel and Gevers (Math. Control Signals Systems 6 (1994) 135) concern the existence of a controller.     

新型节能空调控制系统的研制

地源热泵作为一种新型的高效节能空调系统,在实际的运行中,特别是多机组运行时,应该充分考虑主机和各个水泵的运行耗能问题。重点阐述了地源热泵空调控制系统的硬件实现、分区分时段控制及双机组运行的控制策略。实际运行证明,此控制系统很好地实现了对水泵和机组的节能控制。