Step stress acceleration performance degradation reliability analysis method considering measurement error

Abstract

The invention provides a step stress acceleration performance degradation reliability analysis method considering a measurement error. The method comprises the steps that acceleration performance degradation test data of step stress of all samples is collected through an acceleration performance degradation test, and the acceleration performance degradation test data is preprocessed; a performancedegradation process of a product is described based on a generalized Wiener process, an acceleration degradation model is determined, and a step stress acceleration performance degradation model considering the measurement error is established; a likelihood function is utilized to estimate unknown parameters in the step stress acceleration performance degradation model; and reliability assessmentand life prediction are performed on the product. Through the method, the measurement error is introduced into step stress acceleration performance degradation data analysis for the first time, different time-varying characteristics of mean value items and variance items are considered, and the method better conforms to engineering actual conditions; and through sufficient development and utilization of vertical information of the degradation data under different stress levels and horizontal information of different samples, the amount of the information is effectively increased, and reliability assessment precision is improved.

Description

technical field [0001] The invention relates to the technical field of reliability analysis of accelerated performance degradation tests, in particular to a step stress accelerated performance degradation reliability analysis method considering measurement errors. Background technique [0002] Due to the limitation of test cost and development period, compared with the traditional reliability analysis method based on failure time, the reliability analysis method based on performance degradation data has higher efficiency. However, for some high-reliability and long-life products, often only a small amount of performance degradation data can be obtained within a limited test time, resulting in low evaluation accuracy. In order to solve the above problems, the reliability analysis method based on the step stress accelerated performance degradation test is an effective way. [0003] In the accelerated performance degradation analysis, most of the existing methods assume that t...

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Problems solved by technology

[0005] For ignoring the measurement error of the performance degradation data in the measurement process, it will be impossible to accurately grasp and describe the random influencing factors and time-varying characteristics of the product degradation process, which will affect the technical problem of evaluation accuracy. This invention proposes a step stress acceleration performance considering measurement error The degradation reliability analysis method effectively increases the amount of information and improves the accuracy of reliability evaluation, which is more effective and more in line with the actual situation of the project

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