加速度计贮存稳定期分析

在石英挠性加速度计有限元仿真分析的基础上,得到了加速度计标度因数稳定性随温度及时间的变化数据,采用乘积型最小二乘曲面拟合方法对标度因数稳定性、时间、温度数据进行拟合,建立了标度因数稳定性的加速退化近似模型;考虑不同产品间的分散差异和试验测试误差,对加速退化近似模型进行随机化处理,基于一阶泰勒展开计算方差的方法,给出含置信度的加速退化近似模型;结合加速度计贮存条件,进行基于模型的贮存稳定期分析,得到贮存条件下给定稳定性判据时的加速度计稳定期;同时,也可以给出加速度计稳定性评价结果,判断某贮存条件下贮存一段时间后的稳定性是否能够满足要求.

Analysis of storage stability of accelerometers

Based on the finite element analysis(FEA) results of quartz flexible accelerometers, the stability of the scale factor changing with temperature and time was obtained. Then a kind of surface fitting method which was the product type based on least squares, was applied to fit the simulating data and build the accelerated degradation model of the stability of the scale factor. Considering the discrepancy of the product and the error in testing, the model was randomized. Furthermore, the variance was calculated by applying the first-order Taylor expansion, and then the accelerated degradation model with confidence was established. The analysis of the storage stability of accelerometers was conducted on the basis of the model on the condition of storage, and the storage stable period under the given criterion was also calculated. At the same time, the stability evaluation result was also given, that is whether the stability was satisfied with the demand during a period of time under the storage condition.