Diagnosis analysis on fault tree-analytic hierarchy process of roadheader cutting system

In order to solve the problems hard to search and determine the fault sources in EBZ-160 type roadheader, with the analysis on the causes of the conve ntional typical faults, the fault tree model was established. With the qualitative analysis, the probability importance of the basic events in the fault tree was obtained. In order to solve the difficulty to obtain the fault probability of the basic events during the qualitative analysis on the fault tree, in combination with the basic principle of th e analytic hierarchy process, according to the frequency of the fault occurred, the experts could provide the judgment matrix and the matrix could be applied to obtain th e relative probability of the basic events. Based on the fault of the cutting system in EBZ-160 type roadheader as the case, the fault tree and the analytic hierarchy proc ess combined method was applied to calculate the relative probability value to cause the fault sources of the cutting system in the roadheader and the probability import ance of the basic events. The results would have the guidance role to determine the design weak link of the roadheader, to quick search the fault sources of the roadhe ader and to design the reliability.