考虑间歇期的飞机连杆式舱门收放机构竞争失效分析

Competing failure analysis of aircraft connecting-rod-type cabin door retraction mechanism with intermission considered

建立了考虑间歇期的适用于飞机连杆式舱门收放机构的竞争失效模型。使用泊松过程、Archard磨损模型和功能失效函数对飞机机构的突发型失效和退化型失效进行建模;充分考虑飞机存在不同工作状态的实际特点,引入间歇期因素建立了新的竞争失效模型;以某型飞机连杆式舱门收放机构作为案例,在深入分析机构工作原理和失效特点的基础之上,对所建模型进行应用研究,结果表明间歇期的引入使得各模式失效概率和系统可靠度呈现不同的演化特征,且考虑间歇期的竞争失效模型具有良好的工程实用性。

A novel competing failure model considering intermission is established in this paper,which is appropriate for aircraft connecting-rod-type cabin door retraction mechanism.Poisson process,Archard wear model and failure functions are integrated to describe the catastrophic failure and degradation failure of the aircraft mechanism.Intermission is introduced in the novel competing failure model after considering the actual working condition and working factors.Based on the analysis of mechanism working principle and failure characteristics,a certain aircraft connecting-rod-type cabin door retraction mechanism is studied as an example.The case results indicate that this mechanism has an unusual degradation process.Besides,the novel competing failure model with intermission is effective in engineering project.