Numerical control system reliability rapid Bayes evaluation system under degradation tests

Abstract

The invention discloses a numerical control system reliability rapid Bayes evaluation system under degradation tests. According to the failure data small sample characteristic of a high-reliability long-service-life numerical control system, a Bayes evaluation scheme based on the double stress stepping accelerated degradation tests is adopted to achieve rapid secondary acceleration evaluation effects. A double stress acceleration model is established on the basis of a temperature-humidity double stress stepping accelerated service life degradation test scheme; according to the conditions that test data are blended data composed of complete data and censored data, a multiple blended data regression method is adopted to estimate acceleration model parameters; according to the conditions that numerical control system failure modes are not single, a competition failure reliability evaluation model is established; and according to the failure data small sample characteristic, a Bayes method is utilized to solve prior distribution by means of historical information. According to the numerical control system reliability rapid Bayes evaluation system, the model parameters are evaluated by combination with a stepping accelerated test competition failure model, evaluation precision is improved, numerical control system reliability rapid evaluation theories are enriched, and a theory basis is provided for verifying a numerical control system failure mechanism and improving numerical control system reliability.

Description

technical field [0001] The invention relates to a reliability evaluation system of a numerical control system. In particular, it relates to an efficient and reliable rapid Bayesian evaluation system for the reliability of a numerical control system under a degradation test. Background technique [0002] The reliability of the CNC system is one of the major common and key issues restricting the development of the CNC system industry. The reliability level of CNC system is one of the key factors to determine the function, performance and reliability of CNC machine tools. At present, the domestic numerical control system market share is less than 10%, one of the important reasons is that its reliability is relatively low. [0003] The numerical control system reliability evaluation is to carry on the quantitative evaluation to its reliability level. During the evaluation process, the weak links of the system can be found, which can point out the direction for improving the d...

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Problems solved by technology

At present, the domestic numerical control system market share is less than 10%, one of the important reasons is that its reliability is relatively low

[0007] When conducting (accelerated) life tests on CNC systems, when there are few failure data or no failure at all, it is necessary to obtain sufficient failure data by increasing the number of samples or increasing the test time, which makes the test cost and test period unbearable

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