一类不确定时滞系统的自适应滑模控制

讨论了不确定时滞系统的鲁棒控制器设计问题。利用自适应滑模控制策略,直接克服系统不确定性的影响,保证了从任意初始位置出发的系统在有限时间内到滑模面;基于时滞系统鲁棒稳定控制的结论,导出了时滞依赖滑模控制的新结论。仿真实验证明了所提方法的有效性。     

基于RBF神经网络的互联网时延预测仿真

RBF神经网络采用正交最小平方算法(OLS)决定隐层单元数目、基函数的中心和权值.该算法以每个输入样本为聚类中心,随着正交运算次数的增加,网络的输出误差平方将逐步减小到设定误差范围内,得到隐含层节点数和网络的权值.仿真表明RBF神经网络是有效的.     

Robust stability analysis for uncertain delay systems with output feedback controller

A systematic approach is given in this paper for analyzing the robust stability of uncertain time-delay systems controlled by output feedback. By checking the eigenvalues of a Hamiltonian matrix, the stability of nominal systems can be examined first. Then, for the nominally stable uncertain systems with multiple time delays, a new method using structured singular value technique is proposed for finding a set of uncertain parameters within which the systems remain stable. Moreover, an illustrative example is given to show the usefulness of the proposed approach.     

Design of a bandwidth-on-demand (BoD) protocol for satellite networks modelled as time-delay systems

Bandwidth-on-demand (BoD) access protocols address the problem of guaranteeing a high exploitation of the valuable satellite bandwidth in the presence of large amount of data traffic accessing the satellite network. The novelty of the proposed BoD scheme consists in the use of control theory concepts to model the satellite network as a time-delay system and to generate the bandwidth requests. The proposed scheme, based on the internal model control and on the Smith's principle, yields the following advantages: (i) when the network is not congested, it provides upper-bounds to the queue lengths and to the queuing delays of the satellite terminal buffers; (ii) it is capable of recovering from congested states; (iii) it is independent of the statistical characteristics of the traffic entering the satellite network; (iv) the requests are such that the satellite terminals have always enough traffic to use all the requested bandwidth (so that no bandwidth is wasted). The paper includes simulations showing the effectiveness of the proposed BoD scheme. The work underlying this paper has been performed within the GEOCAST project belonging to the fifth framework Information Society and Technology programme of the European Union.     

On stability of quasipolynomials with annular uncertainties and interval commensurate delays

The paper concerns the Hurwitz stability of a family of quasipolynomials with commensurate delays. Each coefficient of the quasipolynomials belongs to a prescribed annulus in the complex plane, and the delay belongs to a prescribed real interval. A computationally tractable robust stability criterion is the main result of the paper.     

基于互联网的远程控制系统时延补偿的仿真研究

本文介绍了由西门子S7—226PLC与MM440变频器组成的电气控制系统在光缆护套机速度控制中的应用，并对该系统的控制原理作了详细的阐述。     

H∞ and BIBO stabilization of delay systems of neutral type

Frequency-domain tests for the H_∞ and BIBO stability of large classes of delay systems of neutral type are derived. The results are applied to discuss the stabilizability of such systems by finite-dimensional controllers.     

Feedback iterative learning control for time-delay systems based on 2D analysis approach

This paper deals with the iterative learning control (ILC) design for multiple-input multiple-output (MIMO), time-delay systems (TDS). Two feedback ILC schemes are considered using the so-called two-dimensional (2D) analysis approach. It shows that continuous-discrete 2D Roesser systems can be developed to describe the entire learning dynamics of both ILC schemes, based on which necessary and sufficient conditions for their stability can be provided. A numerical example is included to validate the theoretical analysis.     

终端滑模约束的时滞系统模型预测控制

终端约束区域和终端代价项在模型预测控制中起着关键的作用,针对输入受限的时滞系统,提出了终端滑模约束的模型预测控制．将满足输入约束的滑模面作为终端约束区域,使得终端约束区域扩大,有效缩短预测时域,减少计算量,有利于在线应用．最后通过仿真验证了所提方法的有效性．