Research On Fault Diagnosis Methods Of Metro Door Control System Based On Fault-Tree

With the development of rail transportation system in large and medium-sized city, as well as the mature operations, fault diagnosis and state maintenance of rail transportation attract more and more concern from relevant units, and even the whole society. As the most frequently used parts, the research and fault diagnosis of the door control system has become a hotspot.Those technologies of door control unit is analyzed in the paper, such as the internal structure, operating principle, and fault mode of the door control unit. On the basis of detecting platform for EDCU, this paper then put forward a research method based on fault tree analysis. The fault tree model of metro door control system is established. Then Qualitative Analysis and quantitative Analysis are carried out. To solve the problem of the important degree of the bottom event, this paper put forward fuzzy analytic hierarchy process and fuzzy petri net analysis. Either of the methods is to solve the problem of one kind of fault tree: the major fault tree of the general door system and the sub fault tree of electrical door control unit. After calculation, this paper evaluates the reliability of the system.A detailed introduction of theory and solution of fuzzy analytic hierarchy process is given in this paper. Fuzzy judgment matrix is established to describe the relative importance of events in the same hierarchy. According to the difficulty of the traditional ways to solve fuzzy judgment matrix, this paper proposes a solution based on particle swarm optimization algorithm(PSO), which can simplify the solution, and convergence fast.To solve the fault tree with multi hierarchies, fuzzy petri net analysis is raised. This paper introduces ways to set up fuzzy petri net based on both production rules and fault tree. Forward reasoning way is used to solve the petri net model.This paper does some reliability analysis on metro door system based on fault tree, and focuses on calculating the important degree of the failure events. The research in this paper offers the theoretical and technology supporting for maintenance of metro door system.