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1.
熔断器在电路保护中扮演着十分重要的角色。本文对某管状延时熔断器的结构进行合理简化,利用有限元分析软件ANSYS,建立了用于熔断器瞬态温度场计算的三维有限元模型,对该熔断器在不同电流下瞬态温度场变化过程进行了数值模拟。通过一系列数值仿真运算后,本文给出了熔断器工作特性分析。通过单元生死技术,对熔断过程进行了动态模拟。详细分析了环境温度及结构几何尺寸对熔断特性的影响规律。为该熔断器的设计制造以及工程分析提供了理论依据。 相似文献
2.
Sampled-data control for time-delay systems 总被引：1，自引：0，他引：1
The sampled-data systems are hybrid ones involving continuous time and discrete time signals, which makes the traditional analysis and synthesis methodologies of time-delay systems unable to be directly used in the cases of hybrid systems with time-delay. The primary disadvantages of current design techniques of sampled-data control are their inabilities to deal effectively with time-delay and the model uncertainty. In this paper, we generalized the analysis methodology of time-delay systems to that of the hybrid systems with time-delay and uncertainty, which developed a design procedure of sampled-data control for time-delay systems. Asymptotic stability of the time-delay hybrid systems was developed. The time-delay dependent robust sampled-data control for the time-varying delay of an uncertain linear system was then discussed. The results were described as linear matrix inequalities, which can be solved using newly released LMITool. 相似文献
3.
Robust exponential stability analysis of a larger class of discrete-time recurrent neural networks 总被引：1，自引：0，他引：1
ZHANG Jian-hai ZHANG Sen-lin LIU Mei-qin 《浙江大学学报(A卷英文版)》2007,8(12):1912-1920
The robust exponential stability of a larger class of discrete-time recurrent neural networks (RNNs) is explored in this paper. A novel neural network model, named standard neural network model (SNNM), is introduced to provide a general framework for stability analysis of RNNs. Most of the existing RNNs can be transformed into SNNMs to be analyzed in a unified way. Applying Lyapunov stability theory method and S-Procedure technique, two useful criteria of robust exponential stability for the discrete-time SNNMs are derived. The conditions presented are formulated as linear matrix inequalities (LMIs) to be easily solved using existing efficient convex optimization techniques. An example is presented to demonstrate the transformation procedure and the effectiveness of the results. 相似文献
4.
This paper deals with the stability and dissipative problem of a class of stochastic hybrid system. The system under study involves Markovian jump, impulsive effects and time delay, which are often encountered in practice and are the sources of instability. Our attention is focused on analysis of whether the stochastic hybrid system with time-delay is stochastically asymptotically stable and strictly (Q, S, R) dissipative. By introducing an extra artificial time instance, the equivalent system is obtained and the sufficient conditions are derived by using linear matrix inequality (LMI) techniques. The main results of this paper unify the existing results on H∞ control. 相似文献
5.
针对具有输入时滞的系统,为获得更为理想的跟踪性能,提出了一种PD型迭代学习控制算法;借助范数和Bellman-Gronwall引理,证明了算法的收敛性;仿真结果表明,所提算法能较好地解决具有输入时滞系统的跟踪控制问题,加快迭代算法的收敛速度。 相似文献
6.
本文讨论了一个具有时滞效应的不连续输入抗生素对菌群影响的数学模型的动力学性质,得到了菌群持续生存和灭绝的充分条件. 相似文献
7.
韩仲明 《阿坝师范高等专科学校学报》2002,(2):106-110
研究时滞Hopfield神经网络模型,平衡点的全局渐近稳定性与全局指数稳定性,通过使用不等式分析技巧和微分方程性质,得到这类模型稳定性的易于验证的时滞无关充分条件。 相似文献
8.
This paper studies the problem of the stochastic stability and H∞ disturbance attenuation for linear continuous-time time-delay systems that possess randomly Markovian jumping parameters. A delay-dependent sufficient condition on the stochastic stability with given H∞ performance is proposed using the stochastic Lyapunov–Krasovskii stability theory. The conditions are formulated as a set of coupled linear matrix inequalities. 相似文献
9.
针对一类同时具有状态时滞和输入时滞的时变不确定连续时滞系统,研究了保成本状态反馈控制器的设计,假定其中的时变不确定性项是范数有界的,但不需要满足匹配条件,通过构造改造的Lyapunov函数和线性矩阵不等式(LMI)方法.给出了系统满足保性能指标的一个充分条件,仅通过求解一个相应的线性矩阵不等式,就可得到保性能控制器使得闭环系统的一个保成本函数对所有允许的不确定参数有上界.通过求解凸优化问题得到最优保性能控制器,最后用示例说明了该方法的有效性. 相似文献
10.
本文结合MATLAB与VC的编程优势,给出了一种将MATLAB中编译的m函数文件生成可脱离MATLAB环境的动态连接库,然后在VC环境中编写应用程序界面并加载调用动态连接库,从而实现了MATLAB的数学函数与VC的无缝连接。以时滞混沌系统仿真为例,实现了MATLAB图形结果在VC中的调用,证实了方法的可行性。 相似文献