基于弱相关界限理论的大型振动试验设备台体系统可靠性分析

航天器振动试验台部分元件在长时间使用的情况下易老化,甚至失效。采用FMEA方法对试验台整体定性分析,得出最薄弱环节;针对试验台中水平滑台的可靠性串联模型,分析并确定了其符合弱相关界限理论。使用传统可靠性公式和弱相关界限理论对串联模型的可靠性进行了计算,通过对比证实,弱相关界限理论比传统可靠性公式更符合实际情况,对水平滑台可靠度的评定更有效。该方法对机械系统可靠度计算具有理论和实际指导意义。

Reliability analysis of large vibration test equipment platform system based on weak correlation theory

In the vibration test of spacecraft, some of its components will undergo the processes of aging, even failure because of long time use. For a qualitative analysis, the FMEA method is used to analyze the overall test bench, and the weakest link for the test bench is identified. For a horizontal sliding table''s reliability series model in the subsystem, it is shown that it complies with the weak correlation theory. Then, the traditional reliability formula and the weak correlation are used, respectively, to predict the reliability of the model. A comparison shows that the weak correlation is better than the traditional reliability formula under the condition that all parts are not completely independent according to the actual situation. That is to say it is more effective for the reliability assessment of the horizontal sliding bench. The method is of theoretical and practical significance for mechanical system reliability calculations.