Fuzzy Risk Assessment Of Failure Mode And Sensitivity Analysis Of Its Assessment Parameters

Failure Modes and Effects Analysis(FMEA)technology in product design and manufacturing process quality control of the increasingly widespread,and standardized application procedures have been formed.The integration of risk factor assessment and its assessment results,namely the risk assessment of failure modes,is the key content of failure mode and impact analysis techniques.The current failure mode risk assessment research mainly focuses on giving more complex assessment models.However,there is a lack of research on the engineering application consideration of the evaluation model and the influence of each evaluation parameter on the evaluation result.In view of the shortcomings of existing research,this article first based on the fuzzy confidence interval evaluation model of risk factors,from the perspectives of team decision-making and expert opinion gathering,research and build a failure mode risk assessment model,by converting the fuzzy confidence interval number into a triangular fuzzy number,realize the synthesis of risk factor assessment results and the quantitative measurement of assessment results,at the same time,the given risk factors and their risk sequence number threshold conversion methods in the traditional failure mode risk assessment method are given.Realize the corresponding connection with existing industrial standards.Secondly,analyze and give the probability distribution model of each evaluation parameter in the risk factor evaluation model,determine the value range of model parameters through numerical simulation analysis.The third is,on the basis of the aforementioned research,from the two dimensions of the fluctuation of the expert level and the constant true value of the risk factor,the fluctuation of the true value of the risk factor and the constant expert level,apply the global sensitivity analysis method based on radial basis function,determine the nature and extent of the impact of the input evaluation parameters on the risk evaluation results.Finally,based on the given risk assessment model and parameter sensitivity analysis results,revise the value criteria of the existing risk factor evaluation parameters,and apply it to the risk assessment of 30 potential failure modes in a certain type of aircraft engine installation process.The application research results show that the given model and the evaluation parameter value criteria formulated based on the sensitivity analysis results,it enables the assessment experts to give the assessment opinions of risk factors more objectively and finely,obtain the risk assessment results that meet the requirements of industry standards,and significantly improve the assessment results to distinguish the failure mode risk.