FMECA 和 FTA 综合分析法在动密封系统中的应用

摘要

根据型号研制中航行器推进系统动密封结构可靠性提升的实际需求，以某型产品动密封结构为例，应用故障模式、影响及危害性分析（FM ECA ）和故障树分析（FTA）综合分析方法，结合GJB1391和GJB768中部分方法的适用性，给出了适用于工程的FMECA和FTA综合分析法应用实例。分析了动密封结构的失效模式和失效机理，确定了动密封结构的薄弱部位与薄弱环节，提出了相应的设计改进与使用补偿措施。%To meet the demand on reliability enhancement of sealing structure of aircraft propul‐sion system in a model development ,taking a certain model of product as example ,the paper presents real cases of FMECA and FTA comprehensive analysis method applicable to the engineering with FMECA (Failure Mode ,Effect and Criticality Analysis) and FTA (Failure Tree Analysis) after con‐sidering the practicability of some methods in GJB 1391 and GJB 768 .The paper analyzes the failure mode and mechanism of dynamic sealing structure ,determines the vulnerable parts and links of such structure and proposes relevant design improvement and useful compensating measures .