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本文以典型惯导产品加速度计贮存寿命评估为例,提出了一种基于故障行为模型的加速退化试验设计方法,解决了缺乏预试验数据情况下试验应力水平设计的问题。在通过对产品特性和主机理分析基础上,确定表征产品贮存寿命特征参数及试验应力,构建了考虑材料等分散性的加速度计故障行为模型,用以描述参数加速时变规律的特性。在试验应力最高水平确定的情况下,基于给定置信度和故障行为模型,以高应力水平下退化量的置信下限与低应力水平下退化量的置信上限不交叉为原则,采用基于仿真的加速退化试验设计方法,优化确定低应力和中间应力水平,从而设计给出试验剖面,并给出了加速退化试验方案优选流程,最终从备选方案集中确定加速度计试验最优方案。通过实际案例分析,验证了该方法的有效性。
In this paper, taking the storage life assessment of a typical inertial accelerometer as an example, an accelerated degradation test design method based on the fault behavior model is proposed, which solves the problem of experimental stress level design in the absence of pre-test data. Based on the analysis of product characteristics and main mechanism, the characteristic parameters of storage life and the test stress were determined, and the fault behavior model of accelerometer considering the dispersion of materials was constructed to describe the characteristics of time-varying acceleration of parameters. Based on the given confidence level and fault behavior model, under the condition of the highest test stress level, based on the principle that the lower confidence limit of degradation under high stress level and the upper confidence limit of degradation under low stress level do not cross, the simulation-based acceleration Degradation test design method to optimize the low stress and intermediate stress level to design the test profile, and give the accelerated degradation test program optimization process, and ultimately from the alternative solution to determine the optimal accelerometer test program. The actual case analysis shows that the method is effective.