n-n-1:G系统的模糊稳态可靠度

经典马尔可夫模型中故障率和修复率为常数的假定不一定符合实际,比如受气候环境等因素影响部件的故障率和修复率,而用模糊数来表示更具有实际意义。文中在模糊负指数分布的假定下,应用模糊Markov模型及模糊概率理论,并结合模糊数学理论分析n-n-1:G系统,获得了该系统的稳态平衡方程,用割集的形式给出了各状态的可靠度,最终通过去模糊求出系统的稳态可用度。     

两部件可修复温储备系统维修策略的改进

考虑由两个可修复元件、一个可修复的转换开关、一位固定的维修人员组成的两部件可修复温储备系统,为了提升系统可靠度,在维修策略上作了改进,提出了一位是固定维修工,两个及以上元件失效时雇佣一位临时工的方法。并建立了策略改进后所相应的Markov过程,通过Laplace变换给出了系统可靠性指标的计算模型,由案例分析获得策略改进后的模型可使系统的可靠性和可用度等指标在原有的基础上得以提高的结果,从而得到该策略的改进是合理和必要的结论。     

A 2-Unit Warm-Standby Redundant System With Delay and One Repair Facility

This paper introduces the Delay Times (preparing/waiting time for repair). The Laplace-Stieltjes transform of 1) The first-passage time distribution to system failure, 2) The s-expected number of system failures during (0, t], 3) The probability that the system fails at time t, are all derived for a 2-unit warm-standby redundant system by unique modification of a Markov Renewal process. Three examples are given     

Controller Failure Analysis for Systems with Interval Time-Varying Delay: A Switched Method

This paper studies the problem of controller failure analysis for a class of interval time-varying delay systems with a predesigned state feedback controller. Our objective is to establish conditions concerning controller failure time, under which the systems still keep exponentially stable. For this purpose, the systems with controller failures are first formulated as a class of switched delay systems. Next, based on a piecewise Lyapunov functional method, the exponential stability of such systems is guaranteed by restricting the unavailable rate and failure frequency of the controller. All the results are presented in terms of linear matrix inequalities. Two examples are provided to demonstrate the effectiveness of the proposed technique.     

服务台可修的M／G／1排队系统—一些新的可靠性指标

本文进一步分析了服务台可修的Ｍ／Ｇ／１排队系统，获得忙期长度与此忙期中服务台失效次数的联合概率分布等一些新的可靠性指标，给出了计算时刻ｔ服务台失效的瞬时概率和（０，ｔ）中服务台的平均失效次数的近似表达式，最后用实例证明了其有效性。     

一种基于时滞区间不均分方法的变时延网络控制系统的新稳定性条件

针对一种变时延线性网络控制系统,采用时滞区间不均分法,将时滞分割成m个区间.在每个区间都构建不同的Lyapunov-Krasovskii泛函,并引入三重积分项,同时结合自由权矩阵法,在各自的时滞区间上采用保守性小的积分不等式来处理泛函导数,进而获得了保证网络控制系统的一种新的稳定性条件.并且,最后通过相应的数值算例验证了本文中的结论.