Process reliability evaluation method based on nonlinear correlation analysis

Abstract

The invention discloses a process reliability evaluation method based on nonlinear correlation analysis. The method comprises the following steps: firstly, performing failure mechanism analysis and FMEA (Failure Mode and Effects Analysis) analysis on products, determining a product characteristic that affects the inherent reliability of the products and a process characteristic that affects each product characteristic, using a partial mutual information estimation method based on a Clayton copula entropy to select a key product characteristic and a key process characteristic; secondly, giving a dependence structure between the process characteristics by means of a Clayton copula function; finally, giving a product inherent reliability prediction method based on a support vector machine. The process reliability evaluation method based on the nonlinear correlation analysis provided by the invention uses the partial mutual information to effectively measure a nonlinear relation between variables, and uses a relation between the partial mutual information and the Clayton Copula entropy to avoid from estimating the joint probability density function, and improve the accuracy of the partial mutual information estimation; besides, the input variables are effectively selected, thus the prediction accuracy and efficiency of a model are improved.

Description

technical field [0001] The invention relates to a process reliability evaluation method, in particular to a process reliability evaluation method based on nonlinear correlation analysis. Background technique [0002] The inherent reliability of a product is determined by design and guaranteed by the manufacturing process. In the process of engineering practice, products with the same design specifications can be processed and manufactured by different processes, and their inherent reliability will have great differences due to different processes. According to statistics, about 50% of the problems exposed in the use of today's mechanical products are caused by defects in the processing process. Recognizing the formation rules of product inherent reliability in the manufacturing process and quantitatively evaluating the impact of processing technology on product reliability have become the hot and difficult points of current research. [0003] When building a product inhere...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a process reliability evaluation method based on nonlinear correlation analysis, to solve the existing linear correlation analysis method, which is not suitable for evaluating the complex nonlinearity between the inherent reliability of the product and each process characteristic Technical issues related to the reliability of machining processes

Images