时滞离散细胞神经网络的指数稳定性

利用不等式和矩阵范数技巧分别得到了时滞离散细胞神经网络局部指数和全局指数稳定的充分条件，并对指数收敛率和吸引区域进行了估计。     

一类不确定离散广义系统的鲁棒H_2控制

研究一类不确定离散广义系统的鲁棒H2优化控制问题·对系统所有容许的不确定参数,提出满足鲁棒H2性能的一个充分条件,目的是设计状态反馈控制律,保证闭环系统是容许的且满足鲁棒H2性能·得到该问题可解的一个矩阵不等式的充分条件并给出一个控制律的设计·数值例子进一步说明本文的主要结果·     

Optimal control of an M/G/1 retrial queue with vacations

In this note, we consider an M/G/1 retrial queue with server vacations, when retrial times, service times and vacation times are arbitrary distributed. The distribution of the number of customers in the system in stationary regime is obtained in terms of generating function. Next, we give heavy traffic approximation of such distribution. We show that the system size can be decomposed into two random variables, one of which corresponds to the system size of the ordinary M/G/1 FIFO queue without vacation. Such a stochastic decomposition property is useful for the computation of performance measures of interest. Finally, we solve simple problems of optimal control of vacation and retrial policies.     

Robust reliable H∞ control for discrete-time Markov jump linear systems with actuator failures

The robust reliable H∞ control problem for discrete-time Markovian jump systems with actuator failures is studied. A more practical model of actuator failures than outage is considered. Based on the state feedback method, the resulting closed-loop systems are reliable in that they remain robust stochastically stable and satisfy a certain level of H∞ disturbance attenuation not only when all actuators are operational, but also in case of some actuator failures, The solvability condition of controllers can be equivalent to a feasibility problem of coupled linear matrix inequalities （LMIs）. A numerical example is also given to illustrate the design procedures and their effectiveness.     

On the single server retrial queue with priority subscribers and server breakdowns

The author concerned the reliability evaluation as well as queueing analysis of M1, M2/G1, G2/1 retrial queues with two different types of primary customers arriving according to independent Poisson flows. In the case of blocking, the first type of customers can be queued whereas the second type of customers must leave the service area but return after some random period of time to try their luck again. The author assumes that the server is unreliable and it has a service-type dependent, exponentially distributed life time as well as a service-type dependent, generally distributed repair time. The necessary and sufficient condition for the system to be stable is investigated. Using a supplementary variable method, the author obtains a steady-state solution for queueing measures, and the transient as well as the steady-state solutions for reliability measures of interest.     

Acrobot系统基于滑模的离散时间变结构控制

研究了将离散时间变结构控制应用于Acrobot系统的平衡控制器设计的问题.首先给出了Acrobot在垂直向上平衡点处的离散化数学模型.分析了离散指数趋近律存在抖振的机理,针对其不足给出了一种改进的趋近律,并将其应用于Acrobot系统的控制中,设计了离散时间变结构平衡控制器.仿真结果表明,改进的趋近律可有效地减小系统的抖振,并保证系统渐近稳定,实现了Acrobot系统基于滑模的离散时间变结构控制.     

基于T-S模型的非线性系统离散时间滑模控制

基于T-S模糊模型,讨论了一类非线性离散时间系统的控制问题。采用T-S模糊模型来描述非线性系统的动态模型,再将非线性系统的全局T-S模糊模型转化为线性不确定系统的模型。这样复杂的非线性系统的稳定问题就转化为线性不确定系统的鲁棒镇定问题。采用离散时间滑模控制方法实现线性不确定系统的鲁棒镇定。利用用线性矩阵不等式技术设计稳定的滑动模面,以降低非匹配不确定对系统的影响。给出了线性矩阵不等式形式的稳定滑动模面存在的充分条件。此外还给出了滑模控制律的设计方法。所给设计方法可保证系统鲁棒镇定,并且在滑动模面附近的抖振可明显减弱。最后,给出了truck-trailer的仿真算例,证明了所给方法的可行性和有效性。     

离散混沌系统的Matlab仿真

基于M atlab研究了离散混沌系统的数值解法和图形仿真,同时针对离散时滞混沌系统给出了数值仿真的Matlab程序.对于高阶离散混沌系统也可以采用上面的变换将系统降阶,变成一阶差分方程组进行求解,从而离散混沌系统都可以通过简单的编程实现数值仿真.从数值仿真角度来说,所得方法对于离散混沌系统的混沌同步和控制器仿真及误差描述都有积极的意义.     

无穷维电磁系统中时空行为空间相关性分析的一种新方法

提出了利用标准差和空间相关函数相组合来定量分析无穷维系统中时空行为空间相关性的方法。针对一类含无损传输线的二极管无穷维电磁系统,用行波理论推导出了左端点处电压反射波的Poincaré映射关系,建立了传输线沿线电压的离散模型。通过数值计算定性分析了系统中时空行为随参数变化的动态过程。利用方法定量分析了系统中时空行为的空间相关性,与定性分析结果一致。     

基于优化算法的眼科病床分配

模型是一个典型的离散事件系统,它研究了一个眼科医院的病床分配问题,根据本系统中元素所满足的分配规律和实际的统计数据建立了病床分配模型。经过实际的模拟试验和评价体系的评价可看出新模型在评价指标上明显优于旧的模型。