基于薄弱环节的整机加速因子计算

目的当薄弱环贮存寿命都服从指数分布或都服从形状参数相同的威布尔分布时,给出整机加速因子与薄弱环节加速因子关系的公式;若形状参数不同时,给出整机加速因子的取值范围。方法将各个薄弱环节做串联系统处理,利用不同可靠度时常应力和加速应力下系统贮存寿命的关系,计算整机加速因子或给出加速因子范围。结果基于不同薄弱环节数据,总结出整机加速因子或取值范围的计算方法。结论针对系统存在薄弱环节并且薄弱环节寿命服从一定的分布时,可以通过该方法计算出整机加速因子或加速因子的取值范围。

Whole Machine Acceleration Factor Based on Weak Links

Objective To give the formula for the relationship between the acceleration factor of the whole machine and the acceleration factor of the weak link when the storage life of the weak ring is subject to the exponential distribution or to the Weibull distribution with the same shape parameters, and give the whole machine acceleration factor value range when the shape parameters are different. Methods Each weak link was treated as a series system. When degrees of reliability were different, the relationship between normal stress and the storage life of the system under accelerated stress was used to calculate the entire acceleration factor or to give the range of acceleration factors. Results Based on the data of different weak links, the calculation method for the acceleration factor or range of the complete machine was summarized. Conclusion When the weak link exists in the system and the life of the weak link obeys a certain distribution, the range of the acceleration factor or acceleration factor of the complete machine could be calculated by proposed method.