Number set concept based process failure risk assessment method

Abstract

The invention discloses a number set concept based process failure risk assessment method. The method includes the steps of collecting experts' detailed assessment opinions on three risk factors, namely severity, occurrence and detection, of each process failure mode, and using the experts' assessment opinions as a number set in a range: [1, 10]; calculating an average of generalized Hausdorff distances between the experts' assessment opinions and other experts' assessment opinions. In a group decision process, weights of the experts are objectively and quantitatively calculated with the generalized Hausdorff distances, comprehensive assessed values of risk factors and interval-formed RPNs (risk priority numbers) are obtained accordingly, the problem that generally the different process failure modes cannot be distinguished with the traditional RPNs is effectively overcome, arbitrariness and deciding everything by one authority's say during the traditional group decision process are also avoided, and opinions aggregation is more scientific and more realistic.

Description

technical field [0001] The invention relates to an evaluation method, in particular to a process failure risk evaluation method based on the number set concept. Background technique [0002] PFMEA (Process Failure Mode and Effect Analysis) is a systematic reliability analysis method. By analyzing the possible failure modes and their effects of each process step in the production process of the product, the possible risks are determined, and then the high-level Improvement measures are formulated in the risk process link until the RPN (Risk Priority Number) reaches an acceptable level and the entire process system reaches the required reliability. This technology originated in the aviation industry in the United States, and has been widely used in aviation, aerospace, machinery, automobiles and other fields. It has achieved remarkable results and played a huge role in ensuring the reliability of products in these fields. [0003] Traditional PFMEA mainly uses RPN (Risk Prior...

AI Technical Summary

Problems solved by technology

By retaining the details of expert evaluation to the greatest extent from the three dimensions of interval number, fuzzy factor and confidence, the expert evaluation opinion is regarded as a number set distributed in the interval [1, 10], and the generalized Hausdorff is introduced at the same time. The distance is used to calculate the similarity of evaluation opinions, so as to obtain the weight of expert discourse that is more in line with objective reality. At the same time, it effectively overcomes the problem that traditional RPN often cannot distinguish different process failure modes

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