基于应力分解法的整机加速因子预计方法研究

提出了计算整机加速因子的新方法.将整机的失效率通过定量分析方法按照部件、失效模式和应力的顺序逐级下分,从而得到各敏感应力的失效率,再通过加速模型计算各失效模式在加速应力下的失效率.最终可以得到整机在加速应力下的失效率,进而计算出整机加速因子.以典型电子产品为例,预计了弹上计算机在温度、湿度、振动综合环境应力下的加速因子为153.5.

Research on Prediction Method of Acceleration Factor of Complete Machine Based on Stress Decomposition Method

A new method for calculating the acceleration factor of complete machine is proposed in this paper. The failure rate of complete machine is divided step by step according to the sequence of components, failure modes and stresses through quantitative analysis method, so as to obtain the failure rate of each sensitive stress, and then calculate the failure rate of each failure mode under accelerated stress through acceleration model. Finally, the failure rate of complete machine under acceleration stress can be obtained, and then the acceleration factor of the whole machine can be calculated. Taking a typical electronic product as an example, the acceleration factor of the missile computer under the comprehensive environmental stress of temperature, humidity and vibration is expected to be 153.5.