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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.
Based on the finite element analysis of the quartz flexible accelerometer, the stability of the accelerometer scale factor with temperature and time was obtained. The product type least squares curve fitting method was used to evaluate the stability of scale factor, time, Temperature data were fitted to establish an approximate model of accelerated degradation of scale factor stability. Random decentralization of accelerated degradation model was considered considering dispersion of different products and experimental test error. Based on the first-order Taylor’s method of variance calculation, , An approximate model of accelerated degradation with confidence is given. Based on the storage conditions of the accelerometer, model-based storage stability analysis is performed to obtain the stability of the accelerometer with given stability criterion under storage conditions. At the same time, Accelerometer stability of the evaluation results to determine the stability of a storage condition for some time after storage can meet the requirements.