基于模糊FMECA的液压系统可靠性分析

该文针对FMECA(Failure Mode,Effect and Criticality Analysis)在运用过程中存在部分模糊性描述,难以获得定量结果的缺点,利用模糊综合评判法对FMECA进行一定程度的改进,形成了模糊FMECA方法。文中以船舶动力推进装置的液压系统所采用的液压元件——比例阀作为研究对象,进行了模糊FMECA分析,并获得了比例阀各失效模式的危害度等级。结果表明,模糊FMECA行之有效,并对提高系统的可靠性有积极意义。

The Reliability Analysis of Hydraulic System Based on the Fuzzy FMECA Method

The FMECA method is difficult to obtain quantitative results in the process of applying. For this disadvantage, The paper developes a new method-The Fuzzy FMECA Method by using fuzzy comprehensive evaluation method to FMECA for a certain degree of improvement. In this paper, we apply the new method on the proportional valve, which is a hydraulic component of the hydraulic system of marine propulsion plant. And we get a harm degree level of each failure mode of the proportional valve as a result. The result shows that the fuzzy FMECA works, and the method has a positive meaning to improve the reliability of the system.