正交设计法优化配煤

采用正交设计法进行配煤试验,研究各类煤的配比与焦炭强度的相关性。用正交设计法可以大大减少试验次数。根据试验得出的M40、M10、大于40mm和大于25mm粒度的数据,进行统计分析,选择出最佳配煤比为：弱黏结煤0,瘦煤25％,肥煤18％,焦粉3％,焦煤54％。     

A New $H_{{bm infty}}$ Stabilization Criterion for Networked Control Systems

This note is concerned with robust H_infin control of linear networked control systems with time-varying network-induced delay and data packet dropout. A new Lyapunov-Krasovskii functional, which makes use of the information of both the lower and upper bounds of the time-varying network-induced delay, is proposed to drive a new delay-dependent H_infin stabilization criterion. The criterion is formulated in the form of a non-convex matrix inequality, of which a feasible solution can be obtained by solving a minimization problem in terms of linear matrix inequalities. In order to obtain much less conservative results, a tighter bounding for some term is estimated. Moreover, no slack variable is introduced. Finally, two numerical examples are given to show the effectiveness of the proposed design method.     

Stability Criteria for Systems with Multiple Probabilistic Intervals Time-varying Delay

International Journal of Control, Automation and Systems - The problem of stability for systems with multiple probabilistic intervals time-varying delay is investigated in this paper. First, it is...     

基于时滞不等分法T-S模糊时滞系统稳定性准则

提出一种新的时滞分解方法—时滞不等分法,研究了T-S模糊常时滞系统的稳定性准则问题。基于Lyapunov稳定性理论,构造恰当的Lyapunov-Krasovskii泛函,以线性矩阵不等式形式给出一个决策变量少、运算效率高、保守性小的时滞相关稳定性准则。最后给出数例说明该方法的有效性。     

On control for linear systems with interval time-varying delay

This paper deals with the problem of delay-dependent robust H_∞ control for linear time-delay systems with norm-bounded, and possibly time-varying, uncertainty. The time-delay is assumed to be a time-varying continuous function belonging to a given interval, which means that the lower and upper bounds for the time-varying delay are available, and no restriction on the derivative of the time-varying delay is needed, which allows the time-delay to be a fast time-varying function. Based on an integral inequality, which is introduced in this paper, and Lyapunov–Krasovskii functional approach, a delay-dependent bounded real lemma (BRL) is first established without using model transformation and bounding techniques on the related cross product terms. Then employing the obtained BRL, a delay-dependent condition for the existence of a state feedback controller, which ensures asymptotic stability and a prescribed H_∞ performance level of the closed-loop systems for all admissible uncertainties, is proposed in terms of a linear matrix inequality (LMI). A numerical example is also given to illustrate the effectiveness of the proposed method.     

Correction to "Comments on 'Stability of fuzzy control systems with bounded uncertain delays'"

The research in the above paper (X. Jiang and W. Xu, "Comments on 'Stability of fuzzy control systems with bounded uncertain delays'", IEEE Trans. Fuzzy Syst., vol. 12, pp. 285-286, Apr. 2004) was carried out while the first author was with the Department of Automation, Tsinghua University, Beijing 100084, China. He is now with the Faculty of Informatics and Communication, Central Queensland University, Rockhampton QLD 47012, Australia.     

NETWORK‐INDUCED DELAY‐DEPENDENT H∞ CONTROLLER DESIGN FOR A CLASS OF NETWORKED CONTROL SYSTEMS

This paper is concerned with the problem of robust H_∞ controller design for a class of uncertain networked control systems (NCSs). The network‐induced delay is of an interval‐like time‐varying type integer, which means that both lower and upper bounds for such a kind of delay are available. The parameter uncertainties are assumed to be normbounded and possibly time‐varying. Based on Lyapunov‐Krasovskii functional approach, a robust H_∞ controller for uncertain NCSs is designed by using a sum inequality which is first introduced and plays an important role in deriving the controller. A delay‐dependent condition for the existence of a state feedback controller, which ensures internal asymptotic stability and a prescribed H_∞ performance level of the closed‐loop system for all admissible uncertainties, is proposed in terms of a nonlinear matrix inequality which can be solved by a linearization algorithm, and no parameters need to be adjusted. A numerical example about a balancing problem of an inverted pendulum on a cart is given to show the effectiveness of the proposed design method.     

New stability criteria for linear systems with interval time-varying delay

This paper investigates robust stability of uncertain linear systems with interval time-varying delay. The time-varying delay is assumed to belong to an interval and is a fast time-varying function. The uncertainty under consideration includes polytopic-type uncertainty and linear fractional norm-bounded uncertainty. A new Lyapunov-Krasovskii functional, which makes use of the information of both the lower and upper bounds of the interval time-varying delay, is proposed to drive some new delay-dependent stability criteria. In order to obtain much less conservative results, a tighter bounding for some term is estimated. Moreover, no redundant matrix variable is introduced. Finally, three numerical examples are given to show the effectiveness of the proposed stability criteria.     

企业如何打开通向知识经济的大门

在知识经济临近之时，我国企业界应如何迎头赶上，本文从研究知识经济内涵和确立其发展观，立足国情企情发挥优势，逐步提高创新水平等有关方面提出了一些具体实施意见。     

Comments on "stability of fuzzy control systems with bounded uncertain delays"

In these comments, some misleading statements in the above paper have been pointed out and relation results are given.