基于故障物理的航空电子设备高可靠性评估

Estimate of high reliability of aviatic electrical equipment based on physics of failure

摘要: 传统的基于事后统计的可靠性评估手段已不能满足高可靠性航空电子设备的设计需求。文章提出在产品的设计阶段应用一种基于故障物理的可靠性评估方法,以某型大气数据计算机为研究案例,将环境载荷模拟施加于产品数字模型上,提取应力信息,进行潜在故障机理分析和相应的故障物理模型确认,以及累积损伤分析,最后得到产品的故障前时间以及故障率和可靠度函数。结果表明,该方法与实际可靠性试验结果有较好的近似度。

Abstract: The traditional way of estimating the reliability of the aviatic electrical equipment is not good for the aviatic electrical equipment of high-reliability. A new method is proposed based on the physics of failure. According to the analysis of the local stress, the failure mechanism and model are identified, then the time to failure is obtained. The result is close to that of the real reliability test.