基于加速性能退化的雷达电源板可靠性评估

Reliability Assessment of Radar Power Supply Device based on Accelerated Performance Degradation

评估雷达系统可靠性时,失效寿命难以获得,性能退化数据成为评估可靠性的重要信息。对其中器件级信息充足,板级、分系统级、系统级现场试验信息缺乏,而收集这些部分的退化数据仍需较长时间,以雷达某一部分的整体为研究对象进行加速退化试验,验证是否存在累积效应及有规律的退化过程。以某雷达电源整板为例,在温度应力下进行恒加加速退化试验,观测到特征退化量电源板输出电压随温度变化的退化规律,进行统计推断。结果表明基于加速退化数据进行该部分可靠性分析方法可行、结果可信,且更具优势,为雷达系统可靠性评估及增强可信度奠定基础。

Performance degradation data become important when analysis system reliability of radar because life data are difficult to acquire. Usually, component reliability information is enough. Board, subsystem, system test data are lacking, whereas collecting these degradation data also have to spent long time. A part of radar can be considered as a research object of accelerated degradation test, and whether there is accumulative effect and degradation rule should be test. Radar power supply board was used to illustrate this method. Constant stress accelerated degradation test was conducted. Rules of output voltage degrading with temperature were observed and statistical inferences were carried though. Conclusions are that the method of evaluating reliability of this part by accelerated degradation data is feasible, result is reliable. It is superior to traditional method and can improve assessment result＇s reliability.