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首页> 外文会议>Reliability and Maintainability Symposium (RAMS), 2012 Proceedings - Annual >Reliability evaluation of phased-mission systems with load-sharing components
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Reliability evaluation of phased-mission systems with load-sharing components

机译：具有负载共享组件的分相任务系统的可靠性评估

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摘要

Many real world systems operate in phased-missions where the reliability structure varies over consecutive time periods, known as phases. For mission success, all phases must be completed without failure. During each mission phase, the system or its subsystems may be subject to different loads (stresses) and environmental conditions. Therefore, the failure (hazard) rate of components can change with phases due to the phase-dependent variations in the loads. In addition, in the majority of applications, the subsystems within a system operate in a load-sharing configuration where the total load on a subsystem is shared by all of its working components. Therefore, upon a failure of a component within a subsystem, the load on the surviving components increases. This in turn induces higher component failure rates, which introduces complex dynamic dependencies among the load-sharing components. Further complicating the analysis are statistical dependencies across the phases for a given component. For example, the state of a component at the beginning of a new phase is identical to its state at the end of the previous phase. The consideration of these dynamic dependencies poses unique challenges to existing reliability evaluation algorithms. In this paper, we propose an efficient recursive algorithm for reliability evaluation of phased-mission systems with load-sharing components. In the analysis, we considered multiple subsystems where each subsystem can have multiple load-sharing components. The proposed algorithm is developed based on: (1) a modularization technique, (2) an easily computable closed-form expression for conditional reliability of load-sharing subsystems, and (3) a recursive formula for the reliabilities of subsystems across the phases. The reliability evaluation algorithm is illustrated using an example.
机译：许多现实世界的系统以阶段性任务运行，在阶段性任务中，可靠性结构会在连续的时间段（称为阶段）中变化。为了使任务成功，所有阶段都必须顺利完成。在每个任务阶段，系统或其子系统可能会承受不同的负载（应力）和环境条件。因此，由于负载中与相位有关的变化，部件的故障（危险）率会随相位而变化。另外，在大多数应用程序中，系统内的子系统以负载共享配置运行，其中子系统上的总负载由其所有工作组件共享。因此，一旦子系统内的组件发生故障，幸存组件上的负载就会增加。反过来，这会导致更高的组件故障率，从而在负载共享组件之间引入复杂的动态依赖性。给定组件的各个阶段之间的统计依赖性进一步使分析变得复杂。例如，新阶段开始时组件的状态与上一阶段结束时组件的状态相同。这些动态依赖性的考虑给现有的可靠性评估算法提出了独特的挑战。在本文中，我们提出了一种有效的递归算法，用于具有负载共享组件的相任务系统的可靠性评估。在分析中，我们考虑了多个子系统，其中每个子系统可以具有多个负载共享组件。提出的算法基于以下方面开发：（1）模块化技术；（2）负载分担子系统的条件可靠性的易于计算的闭式表达式；（3）子系统在各个阶段的可靠性的递归公式。举例说明可靠性评估算法。

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