基于模糊理论的改进危害度评估方法  

Improved Hazard Assessment Method Based on Fuzzy Theory

作　　者：章浩然 洪荣晶[1] ZHANG Hao-ran;HONG Rong-jing(School of Mechanical and Power Engineering,Nanjing Tech University,Nanjing 211800,China)

机构地区：[1]南京工业大学机械与动力工程学院,南京211800

出　　处：《组合机床与自动化加工技术》2020年第7期26-29,35,共5页Modular Machine Tool & Automatic Manufacturing Technique

基　　金：江苏省科技成果转化专项(BA2017099)。

摘　　要：针对在传统的故障模式影响及危害性分析中,利用风险优先数评估系统危害度时受评估人员主观因素影响较大,获得的危害度结果往往难以排序,以及无法对风险三要素之间进行权重分配的缺点,提出了一种基于模糊理论的改进危害度评估方法。通过构建模糊评判矩阵以及权重向量来获得评判结果;对评判结果进行反模糊化处理实现各故障模式危害度大小的排序。从而提取出对系统影响最大的若干个故障模式,针对这些故障模式对系统进行改进,进而提高数控机床的可靠性。通过此方法能够更加科学的从大量的故障模式中筛选出关键性的故障模式,帮助企业明确产品的改进方向,降低研发成本与周期,对提高企业的经济效益有着积极的作用。For the assessment of hazard using the RPN in traditional FMECA. The results are greatly influenced by the subjective factors of the assessors and it is difficult to rank the hazard and the weights between the three elements of risk is hard to assign. An improved hazard assessment method based on fuzzy theory is proposed. Getting results by constructing fuzzy evaluation matrix and weight vector. Defuzzification of the evaluation results to achieve the order of the degree of hazard of each failure mode. Extract several failure modes that have the greatest impact on the system. Improve the system reliability by improving these failure modes. Using this method, it is possible to more scientifically select key failure modes from many failure modes, it can help companies identify the directions of product improvement and reduce R&D costs and cycles. It has a positive effect on improving the economic efficiency of companies.

关 键 词：故障模式、影响及危害性分析 模糊评判 数控机床可靠性 

分 类 号：TH162[机械工程—机械制造及自动化] TG506[金属学及工艺—金属切削加工及机床]