基于可靠性分配的整机加速因子计算方法研究

Research on the Calculation Method of Overall Acceleration Factor Based on Reliability Allocation

目的验证长寿命高可靠整机产品的可靠性。方法基于RPN数据的可靠性分配方法,得到子系统在各故障模式下的失效率,接着针对导致各故障模式发生的多种应力,研究温度循环、温度驻留、湿度、振动应力下的加速因子,推导出整机加速因子计算公式,并以某典型电子产品加速试验为例,验证该方法的有效性。结果整机加速因子为322.5,比传统方法计算得到的4.78×105更符合实际情况。结论基于可靠性分配的整机加速因子计算方法为整机可靠性验证提供了合理的理论依据。

Objective To verify the reliability of system-level equipment with high reliability and long life. Methods Based on RPN data, the reliability allocation method was established, and the failure rate of subsystems for each failure mode was obtained. According to various stresses that may lead to different failure modes, acceleration factor under the stress of thermal cycling, thermal dwell, humidity and vibration was studied, and the formula to calculate the overall acceleration factor was deduced. And the accelerated test of a typical electronic product was taken as an example to demonstrate the effectiveness of the proposed approach. Results The calculated overall acceleration factor was 322.5, which was closer to the actual condition than the value of 4.78×10^5 calculated based on the traditional method. Conclusion The calculation method ofoverall accelerated factor based on reliability allocation provides reasonable theoretical reference for reliability verification test of system-level equipment.