Step-down stress acceleration test method based on acceleration factor model

Abstract

The invention discloses a step-down stress acceleration test method based on an acceleration factor model. The method comprises the following steps: 1, designing an acceleration test scheme; 2, implementing an acceleration test; 3, selecting an acceleration factor model; 4, carrying out probability statistical analysis; 5, carrying out acceleration factor model parameter regression analysis; and 6, performing reliability and service life evaluation. According to the method, an original acceleration model is converted into an acceleration factor model, a mathematical method for estimating an acceleration factor by utilizing acceleration test data is provided, unknown parameters of the acceleration factor model are obtained through regression analysis, and step-down stress acceleration testdata is equivalently converted to a normal stress level by utilizing the acceleration factor model; and finally, the equivalent life data is analyzed to obtain product reliability and life indexes. According to the method, the simplification and standardization of the data analysis process of the step-down stress acceleration test in engineering application are facilitated, and the mathematical threshold of the engineering application is reduced; the invention provides a set of efficient and simplified test method for the application in engineering.

Description

technical field [0001] The invention belongs to the technical field of accelerated tests, in particular to a step-down stress accelerated test method based on an acceleration factor model. Background technique [0002] Accelerated Testing is based on reasonable engineering and statistical assumptions, using statistical models related to physical failure laws to convert reliability information obtained under accelerated stress levels to obtain reliability characteristics of products under normal stress levels a test method. In other words, the accelerated test is a rapid test method that shortens the test period by increasing the test stress level while keeping the failure mechanism unchanged. [0003] In the early 1970s, the accelerated test received extensive attention in related fields in my country, and has been in the state of research and application. At present, it has been used in missiles, ammunition, engines, bearings, gears, low-voltage motors, He-Ne lasers, capac...

AI Technical Summary

Problems solved by technology

At present, the step-down stress acceleration test mainly uses the acceleration model to describe the relationship between the product life characteristics and the stress level. It is necessary to solve the parameters of the acceleration model and the statistical model during the modeling analysis. The solution process is relatively complicated, which is not convenient for engineering application.

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