星载数据管理系统的共模故障分析方法

Common mode failure analysis for on-board data manger system

数据管理系统是低能X射线望远镜进行数据传输和数据处理的关键电路模块,为提高可靠性采用冷贮备冗余设计,但冗余设计会引入由共模故障引起的失效。因此,结合空间应用的环境,在对低能X射线望远镜的数据管理系统的故障树分析的基础上,对其进行共模故障方法的研究。首先,针对数据管理系统进行传统故障树的构建;其次,确定数据管理系统的共模故障分析对象,分析共模故障产生的原因及机理;再次,对数据管理系统进行共模故障定量分析;最后,通过对比考虑共模故障和未考虑共模故障的定量结果,提出改进设计措施。通过对数据管理系统进行共模故障定性和定量分析,找出引起发生共模故障的主要原因,并提出改进措施,提高了星载数据管理系统的可靠性。

As a key circuit module of Low Energy X-ray Telescope （LE） for data transmission and data processing, the data manger system adopts cold redundant design of redundancy to improve the reliability. However, the redundant design brings common-mode fault analysis in the system. Therefore, combining with space environment, the paper studies the common-mode failure based on the fault tree analysis method, taking LE as its object. First, the paper builds s Fault Tree on the data manger system. Second, it confirms the object of the common-mode fault analysis, and finds out the reason and mechanism. Third, it makes qualitative analysis and quantitative analysis on the system. At last, by comparing the quantitative analysis results when considering and unconsidering the common-mode failures, the measures to improve the design are put forward. Through common-mode failure analysis on the data manger system, it gets the main causes that lead to the common-mode failure, and puts forward the measures to improve the reliability.