基于模糊故障树的数控刀架系统可靠性分析
The Reliability Analysis of CNC Turret System Based on Fuzzy Fault Tree

从数控刀架转位过程的失效模式出发,运用故障树分析理论,建立了以刀架锁不紧和刀架卡死为顶事件的故障树模型,并收集相关的故障历时数据。针对模型中各事件故障发生概率不确定等因素,引入模糊数学理论,构建概率模糊数,并给出运算法则。对模糊故障树进行定量分析,得到顶事件故障概率区间及底事件重要度排序。结果表明:发信元件、预定位元件及规范操作为影响刀架可靠性的薄弱环节,从而为刀架可靠性的提升提供了良好的数据分析基础。
The fault tree model of the CNC turret being not tight and stuck was developed with the failure modes of indexing process and the theory of FTA(fault tree analysis), also, the lasted failure data was collected. The probability fuzzy numbers were generated based on the fuzzy set theory, as it was difficult to gather the exact failure data for each event under uncertain situations, and the algorithms was given. The top event failure probability interval and the end event importance sorted were given on the quantitative analysis of the fuzzy fault tree. The results show that the Signal elements, re-positioning devices and Standard operation was the weakness for the reliability of CNC turret, which provides the basis of data analysis for improving reliability of CNC turret system