电子产品野外环境下温循加速载荷谱编制方法

目的 将电子产品在野外环境下日变化波动与季节差异明显的温度载荷编制成温循载荷谱和转换为加速载荷谱。方法 通过四点雨流计数法提取原谱中的载荷循环信息,对提取的循环信息进行分布拟合、相关性检验等统计分析,进而构建循环均值与范围值的联合概率密度函数,再运用概率密度法,编制出8×8二维环境载荷谱。在二维载荷谱基础上,编制出温循载荷谱,使用针对电子部件参数修正的加速方程转化为加速载荷谱。结果 利用野外作业现场1个作业周期内的气温纪录,提供了一套编制温循载荷谱和转换加速载荷谱的合理化流程和解决方案。结论 该制谱方法可以利用原始环境谱中绝大部分有效信息,较好地还原电子部件野外作业阶段经历的温度变化过程,为电子产品的加速寿命试验和使用寿命预测奠定基础。

Method for Compiling Temperature Cycling Acceleration Load Spectra of Electronic Products in the Field Environment

The work aims to compile the temperature load of electronic products with obvious daily fluctuation and seasonal difference in field environment into temperature cycle load spectrum and convert it into the acceleration load spectrum. The load cycle information in the original spectrum was extracted by the four-point rain flow counting method. The extracted cycle information was subject to statistical analysis such as distribution fitting and correlation testing, and a joint probability density function of cycle mean and range value was constructed. Then, the probability density method was used to compile 8 × 8 two-dimensional environmental load spectrum. On the basis of the two-dimensional load spectrum, a temperature cycle load spectrum was simultaneously developed and transformed into an acceleration load spectrum by an acceleration equation for electronic component parameter correction. Through the temperature record in a field operation cycle, a set of reasonable processes and solutions for compiling the temperature cycle load spectrum and converting it into the acceleration load spectrum were provided. This compiling method can utilize the vast majority of effective information from the original environmental spectrum to better reproduce the temperature changes experienced by electronic components during field operations, laying the foundation for accelerated life testing and service life prediction of electronic products.