基于模糊动态故障树的化工设备故障诊断方法研究

摘要

本文针对化工设备故障具有模糊性、动态性的特点,提出了建立模糊动态故障树对其进行预测诊断,重点对模糊动态故障树定量分析方法进行了研究,提出了基于最小割集、割序的定量分析方法.该方法将模糊动态故障树分解为模糊静态子树和模糊动态子树,然后分别建立以最小割集和最小割序为基础的定量计算模型,同时引入了弱三角范数的概念以减少由于数据模糊性扩散而引起计算结果不准确的现象.最后给出了最小割集、割序和底部事件重要度的计算公式,分析了化工设备故障诊断的流程,并通过实例验证了该方法具有计算准确,效率高,通用性强的特点,适用于化工设备的故障诊断.%In view of the fuzzy and dynamic characteristics of chemical equipment fault,a fuzzy dynamic fault tree is put forward to forecast and diagnose the faul.This resear ch focuses on the quantitative analysis method of fuzzy dynamic fault tree,and p roposes a quantitative analysis method based on the minimum cut set and cut sequ ence.The fuzzy dynamic fault tree is decomposed into fuzzy static subtree and fu zzy dynamic subtree.Then based on minimum cut set and minimal cut sequence,quant itative analysis models of fuzzy static subtrees and fuzzy dynamic subtree are e stablished.In order to reduce inaccurate calculation results caused by diffusion of data fuzziness,the concept of weak t-norm is introduced into the two subtree s.Finally,the calculation formula of the minimum cut set,cut sequence and the bo ttom event importance are given,and the process of fault diagnosis of chemical e quipment is analyzed.Through an example,the method is proved to be accurate,effi cient and universal,and it can be applied to the fault diagnosis of chemical equ ipment.