基于数控磨床FMECA与模糊TOPSIS的FMEA方法研究

根据收集的故障数据分别对数控磨床的进给系统进行基于故障模式影响及危害性分析（FMECA）和模糊逼近理想排序法（TOPSIS）的FMEA方法研究。利用FMECA方法对系统进行了故障模式分析、故障原因分析和危害度分析；根据故障模式对系统的危害度，对故障模式进行风险排序。采用基于模糊TOPSIS的FMEA方法，对故障模式进行模糊语言评价，根据引入的三角模糊数进行量化，构建模糊决策矩阵并且规范化处理；基于熵权法确定3个风险因子的权重并构建加权规范化模糊决策矩阵。采用TOPSIS计算出各故障模式的相对贴近度并进行风险排序。结果表明：2种方法的实验结果相互验证了其可行性，基于模糊TOPSIS的FMEA方法更准确、实用。

Research on FMEA Method Based on NC Grinder FMECA and Fuzzy TOPSIS

According to the collected fault data,the FMECA and fuzzy TOPSIS FMEA methods were studied on the feed system of the CNC grinder.Failure mode,fault cause analysis and hazard analysis were carried out by using FMECA method;according to the hazard degree of the failure mode to the system,the risk sequence of the failure mode was carried out.FMEA method based on TOPSIS was used to conduct fuzzy language evaluation of fault mode,and then it was quantified according to the introduced triangular fuzzy number,and a fuzzy decision matrix was constructed and standardized;the weight of the three risk factors based on the entropy weight method were determined and the weighted normalized fuzzy decision matrix was constructed.The TOPSIS was used to calculate the relative closeness of each failure mode and the risks were ranked.The results show that the feasibility of two methods have verified each other,and the FMEA method based on fuzzy TOPSIS is more accurate and practical.