某伸展臂锁定机构的可靠性分析

Reliability Analysis of Locking Mechanism of a Deployable Mast

改进某伸展臂锁定机构,通过分析其工作原理与失效模式,构建锁定可靠性模型。综合考虑尺寸、装配误差和构件变形对锁定功能的影响,利用一次二阶矩法得到可靠性指标。结合实际尺寸,计算出室温及空间极限温度下的可靠度,分析出影响可靠度的主要因素,并提出改进措施。结果表明,新结构可有效提高可靠度。

Locking mechanism of a deployable mast was modified. On the base of working principle,the mechanism' s failure mode was analyzed and a new model of reliability was constructed. In the process of calculating reliability index,the factors such as size,assembly error,and space environment influence were taken into consideration,and the method of MFOSM( Mean First Order Second Moment) was applied. Based on the actual size of the mechanism,locking reliabilities at both room temperature and space limit temperature were calculated. The main factors that influence the reliability were analyzed and the improvement was put forward. The result shows that the new model has a high reliability.