关键词: 可靠性评估, 加速退化, 加速因子, 有效性辨识, 逆高斯

Abstract:

The technology of accelerated degradation testing has become an efficient approach to evaluating the reliability of the degrading product. However, the method of analyzing accelerated degradation data, which excessively dependents on subjective experience, results in the inaccuracy of the reliability evaluation. In the paper, a more objective method based on acceleration factor constant principle is proposed. First, the changing rules of the parameters of degradation models are deduced according to the acceleration factor constant principle. Next, the effectiveness of the degradation data under each accelerated stress is identified through the parameter equation independent of accelerated stress. The key is that a t statistic is constructed to verify whether the parameter estimates satisfy the parameter equation. Then, the acceleration models of the parameters dependent on accelerated stress are constructed. Last, the effective accelerated degradation data is utilized to estimate parameters, so the reliability under the normal stress level can be extraplolated. The proposed method is demonstrated by taking the inverse Gaussian process as an example. Both the simulation test and case application indicate that the study of the paper provides a more objective and reasonable technical approach to reliability evaluation based on accelerated degradation data.

Key words: reliability evaluation, accelerated degradation, acceleration factor, effectiveness identification, inverse Gaussian