基于模糊综合评判的电液伺服阀FMECA

针对电液伺服阀FMECA(Failure Medes,Effect and Criticality Analysis)中对整体危害度分析欠缺及无法对危害度、发生概率和检测难易度进行权重分配的缺点,用模糊综合评判的方法对电液伺服阀FMECA进行了改进.通过建立因素集、评价集和权重集等的步骤,实施模糊综合评判,得到评判结果,给出电液伺服阀各故障模式对整个伺服阀系统的危害度等级.根据评判的结果,可以确定各故障模式之间的相对危害度大小并进行排序,同时可以通过二级评判得到伺服阀故障的危害度等级,对进一步提高可靠性和保障性水平有积极的意义.

Fuzzy comprehensive evaluation in FMECA of electro-hydraulic servo valve

According to the limited analysis of the whole system or product and the unreasonable weight distribution of the failure risk, occurrence probability and detective difficulty, the fuzzy comprehensive evaluation was proposed to optimize the failure modes, effect and criticality analysis(FMECA) of the electro-hydraulic servo valve. The evaluation result was obtained after the factor set, the evaluation set, the weight set and other parameters determined. The level of the risk degree of every single failure mode to the whole servo valve system was also given. In the application of the fuzzy evaluation results, the order of the failure modes was determined by the relative risk level. And the risk level of the whole electro-hydraulic servo valve would be obtained. These results have a positive meaning to the further improvement of reliability and the maintenance of the electro-hydraulic servo valve and other products.