基于故障物理的惯导电路可靠性预计新方法  

Approach to reliability prediction of inertial navigation circuits based on physics of failure

作　　者：骆明珠[1] 康锐[1] 

机构地区：[1]北京航空航天大学可靠性与系统工程学院,北京100191

出　　处：《中国惯性技术学报》2013年第6期828-833,共6页Journal of Chinese Inertial Technology

基　　金：国家自然科学基金项目(61104123)

摘　　要：传统的基于故障率经验数据的可靠性预计方法不能满足具有高可靠长寿命特征的惯导电路的设计分析需求,而现有的基于故障物理的方法只能分析产品在寿命周期内经历单一典型任务剖面下的故障前时间。以某型飞机惯导系统内的电源电路模块为研究对象,在分析并确定其在寿命周期内可能经历的多个任务剖面和产品在每个任务剖面下的潜在故障机理及其对应的故障物理模型的基础上,通过应力分析模拟载荷施加过程,利用累积损伤和多故障时间竞争理论模拟故障发生过程,最后统计分析得到产品在寿命周期内经历多任务剖面下的平均故障前时间,获得其故障率和可靠度函数。结果表明,该新方法可获得比现有方法更接近产品实际使用情况的可靠性预计结果。Traditional reliability prediction methods based on empirical data of failure rate cannot meet the analysis requirements in the design of inertial navigation circuits with high reliability and long life characteristics. The existing method based on physics of failure(PoF) merely predicts time-to-failure of electronic products suffering from one typical single mission profile. This paper analyzed the multiple mission profiles in life cycle, potential failure mechanisms and corresponding PoF models under each profile of a power circuit module of some airplane’s inertial navigation system. Real procedure of load application was simulated with stress analysis. By using accumulated damage and multiple failure time competition theories, the failure occurrence process was imitated. The mean time-to-failure, failure rate and reliability of the circuit under multiple mission profiles in the whole life cycle were calculated. The results show that the reliability prediction results by the proposed method are closer to those by the previous methods under practical application condition.

关 键 词：故障物理 可靠性预计 多任务剖面 惯导电路 

分 类 号：TP[自动化与计算机技术]