基于T-S模糊故障树的煤矿坑道钻机液压动力系统故障诊断研究

Fault diagnosis of hydraulic power system for coal mine tunnel drilling rig based on T-S fuzzy fault tree

针对煤矿坑道钻机液压动力系统复杂化带来系统中各元件间逻辑关系模糊、失效形式多态性及故障概率获取困难等问题,克服传统故障树在复杂机电液装备故障诊断分析中的局限性,实现及时准确获取设备故障信息,发现故障原因并采取措施,提出一种基于T-S模糊故障树煤矿坑道钻机液压动力系统的故障诊断方法。以ZDY25000LK型钻机液压动力系统为研究对象,对系统的层次结构进行分析,以T-S模糊故障树描述系统的性能变量,进行分析建树。根据质心距离相似度的度量法对专家评估的底事件模糊概率进行修正,求解顶事件在不同故障程度时发生概率的梯形模糊数。通过T-S概率重要度分析,确定各底事件的重要度排序,指出在不同故障程度时液压动力系统的薄弱环节。结果表明:部件级到系统级事件发生严重故障的概率呈递增趋势,系统中多个部件发生轻微故障时,系统发生严重故障的可能性较大。各事件的故障程度对上级事件发生的贡献度不同,根据重要度排序锁定故障位置并判断故障原因。当液压动力系统出现严重故障时,根据重要度分析结果,应优先排查安全阀工作情况、油泵内部磨损情况及内部串油情况。该方法实现在不同故障程度时系统中薄弱环节的快速定位,在鄂尔多斯淮河能源唐家会煤矿的工程试验中得到验证,为提高煤矿坑道钻机的可靠性提供了参考依据。

In view of the problems of fuzzy logic relation between the elements of the system,the polymorphism of fault mode,and the difficulty in obtaining the fault probability as a result of the complication of the hydraulic power system for coal mine tunnel drilling rig,a fault diagnosis method of hydraulic power system for coal mine tunnel drilling rig based on Takagi-Sugeno(T-S)fuzzy tree was proposed to overcome the limitations of traditional fault tree in fault diagnosis and analysis of the complex electromechanical hydraulic equipment.The method could timely and accurately obtain the fault information of equipment,and to find out the reasons and to take appropriate measures.Herein,research was conducted based on the hydraulic power system of ZDY25000LK drilling rig,with the hierarchical structure of the system analyzed and the performance variation described by the T-S fuzzy fault tree for analysis and tree establishment.Moreover,the fuzzy probability of the bottom events evaluated by experts was corrected according to the measurement method for centroid distance similarity,and thereby the trapezoidal fuzzy number of the probability of top event occur-ring in different fault conditions was solved.Furthermore,the importance of the bottom events were ranked based on the importance analysis of T-S probability,with the weak link of hydraulic power system in different fault conditions poin-ted out.The results show that the probability of serious faults is increasing for the events from component level to sys-tem level,and serious faults are more possible to occur if minor faults occur in multiple components of the system.As the fault degree of each event has different contribution to the occurrence of superior events,the fault should be located according to the importance ranking,and further the causes of fault could be judged.When the hydraulic power system has a serious fault,the working condition of safety valve,the internal wear condition of the oil pump and the internal oil running condition should be investigated first according to the importance analysis results.Therefore,the weak link of the system could be located rapidly with this method in various degrees of fault,which was verified in the engineering test of Tangjiahui Coal Mine of Huaihe Energy in Ordos,thus providing a reference basis for improving the reliability of coal mine tunnel drilling rig.