基于分离策略的航天器多故障模式诊断方法

针对定性模型诊断方法在处理多故障模式复杂系统时计算量大，不能满足航天器自主诊断实时性要求的问题，提出了新的诊断方法。为了减小冲突识别的实时计算规模，引入冲突识别的分离策略，提出了解析冗余计算方法。扩展了候选产生算法，先识别可能的异常部件，再通过冲突环境对异常部件的故障类型进行确定，在实现多故障模式系统故障诊断的同时，缩小了匹配空间。以某卫星一次电源系统为例，通过与现有算法进行对比，验证了本文的方法能够有效地减小诊断的规模，提高诊断效率，满足航天器自主诊断的需求。

A Spacecraft Autonomous Failure Diagnosis Approach for Multiple Failure-Mode System Based on Qualitative Models

In order to solve the large amount of calculatial problem of the failure diagnosis approach for a multiple failure mode complex system based on qualitative models,a new approach is proposed in this paper.Aiming at reducing the real-time computational scale,a method is proposed for calculating the analytic redundancy when a separation strategy for conflict recognition is adopted.The candidate generation method is extended by recognizing the failure component firstly,and the confirming the failure-mode.This method can reduce the matched space effectively while implementing the failure diagnosis of multiple failure mode system.This approach is applied to a primary electrical power system of some satellite,results of comparison with the existing method show that the approach can reduce the amount of calculation,and improve the diagnosis efficiency.