基于距离区间数算子的故障模式与影响分析方法

Failure Mode and Effect Analysis Method Based on a Distance Interval Number Operator

现有故障模式与影响分析(FMEA)方法在属性值为直觉模糊数且风险程度采用确定距离算子度量的情况下,评判专家通常难以精准地描述相关不确定性问题。因此,首先在有序加权距离算子、区间数的理论以及区间数排序方法研究基础上,提出了直觉模糊混合欧氏距离区间数(IFHEDIN)算子及其优良性质。其次,构建基于不确定IFHEDIN算子,改进FMEA方法,以进行产品或者系统故障模式的可靠性分析,并对风险等级进行计算与排序。最后,以实际医院放射肿瘤治疗过程中,故障模式的风险分析以及评价为例,论证了所提方法的有效性、可靠性以及精准性,为相关医疗诊断管理者进行风险应对和控制提供决策支持。

When the attribute value of the existing failure mode and effect analysis(FMEA)method is the intuitionistic fuzzy number and the risk degree is measured by deterministic distance operator,it is difficult for evaluation experts to accurately describe the related uncertainty problems.Therefore,first an intuitionistic fuzzy hybrid Euclidean distance interval number(IFHEDIN)operator and its excellent properties are proposed based on the study of the ordered weighted distance operator,the theory of interval number and the sorting method of interval number.Then,the uncertain IFHEDIN operator is constructed to improve the FMEA method so as to analyze the reliability of failure modes of products or systems,and to calculate and rank the risk levels at the same time.Finally,the effectiveness,the reliability and accuracy of the proposed approach are verified by the risk analysis and evaluation of failure mode in the actual hospital radiation tumor treatment process,which provides decision-making support for relevant medical diagnosis managers to deal with and control risks.