加速度计加速退化机理模型建模方法

摘要

To deal with the difficulties of lacking mechanism model for traditional accelerated degradation test design, a modeling method was proposed based on main mechanism test, key part simulation, parameters analysis and system identification. The main mechanism was identified and its test was carried out next. The key output parameters were obtained through finite element analysis. Then the relationship between key output parameters and product performance parameters was gained by parameters analysis. Finally, the accelerated degradation mechanism model was got through system identification. Taking account of the accelerometer, the accelerated degradation mechanism model and the results of scaling factor stability analysis at constant temper- ature were given. The conclusion of comparing the model results with historical data at constant temperature proved that the method is feasible.%针对传统加速退化试验方案设计缺乏机理模型支持的问题，给出一种基于主机理层试验、关键部件仿真、参数解析和系统辨识于一体的加速退化机理模型建模方法．调研相关资料确定影响产品参数变化的主机理，通过主机理层试验得到有限元仿真输入参数，结合有限元仿真得到产品关键有限元输出参数，同时利用解析方法得到有限元输出参数和产品参数之间关系，根据系统辨识方法建立了加速退化机理模型．以加速度计为例，建立了加速度计标度因数稳定性加速退化机理模型，将模型结果与其在常温贮存条件下结果进行对比分析，结论显示该方法的有效性．