Maintenance Strategy Optimization Of Urban Railway Vehicle’s Door Based On The Analysis Of Reliability And Maintenance Cost

Door system is one of the key urban railway vehicle system, whose good technical condition is an impotent guarantee for the urban railway vehicle to achieve punctually operation and rapid frequently hop off.In this paper, door system of urban railway vehicle is for the study. In order to achieve the goals of improving maintenance efficiency and reducing maintenance costs, the door system’s maintenance strategy was optimized by establishing the maintenance decision-making model of the components, based on reliability analysis and maintenance cost analysis. The main contents of this paper include:First, according to the doors failure data and maintenance technical information, reliability and maintainability of the door system was analyzed, in the method of failure mode effects and criticality analysis (FMECA). Then, the results of the analysis was obtained, including fault modes, fault effects, fault criticality, fault detection methods, maintenance measures etc. And these results have laid the foundation for the maintenance strategy optimization of door system.Second, taking the severity, criticality and price as the evaluation index and using AHP to determine the weight of each index, a classification model based on the ABC classification and integrated score of the components has established; on the basis of the established classification model, the components of the door system are divided into three categories:key repair components, important repair components and general repair components. The obtained components classification results can lay the foundation for the decision of maintenance mode, and will also being able to provide a reference for the efficient and orderly management of the maintenance work of door system.Third, after analysis the influence of fault type, fault effects etc. on the decision of maintenance mode, a decision mode based on the logical decision method was established for ease of determine maintenance mode of component. According to the decision model, the analysis of maintenance mode for all parts of the door system was made. And finally, the most suitable maintenance mode and work type of the component were confirmed, and also, some suggestion based on the decision result were made in order to improve the door’s maintenance work.Fourth, on the basis of cost analysis and fault rate analysis, depending on the type of maintenance work and taking maintain the reliability requirements at the lowest cost optimization objectives’ as the optimization objective, three optimization models ofpreventive maintenance cycle were established. The models include potential failure detection cycle optimization models, functional fault inspection cycle optimization model and periodic maintenance cycle optimization model. On this basis, according to the fault statistical results of online and library maintenance and compiling by MATLAB, the best preventive maintenance cycle of the various components of the door system was calculated. Finally, the reliability validation and economic analysis of the maintenance cycle optimization results were carried out, and the results showed that:if executed optimized the maintenance cycle, the requirements of door’s operational reliability can be meet, and the maintenance workload and cost can be effectively reduced.In this paper, depending on the research of the reliability analysis, maintainability analysis, components classification, maintenance mode decision and maintenance cycle optimization of the door system of urban railway vehicle, some result and conclusion were obtained. And the significance of these result and conclusion lies in providing some reference for the conduction and management of maintenance work.