Optimization Study On The Planned Maintenance Mode Of Urban Rail Transit Vehicle

Urban rail transit system is a kind of transportation system with large capacity and high efficiency.In recent years,it has been greatly favored by many cities,and the urban rail transit industry has vigorously developed.As a vehicle for passengers,urban rail transit vehicle is an important part of urban rail transit system.Its status is directly related to the operation quality and service quality of urban rail transit system.With the increase of operating mileage and the reduction of vehicle departure interval,how to scientifically and rationally formulate vehicle maintenance plan to ensure vehicle reliability and vehicle on-line rate has become an important issue in the operations.In view of the above problems,this paper aims to improve the on-line rate of vehicle,and studies the optimization method of the planned repair mode of urban rail transit vehicle.Firstly,this paper analyses the advantages and disadvantages of the existing maintenance system for urban rail transit.From the perspective of maintenance procedures,the original maintenance contents are scientifically and reasonably disassembled and optimized to form a new monthly maintenance regulation by adopting the mode of balanced maintenance.With the application of this regulation,the number of vehicular queues that are checked and stopped every day is greatly reduced,and the on-line rate of vehicles is increased.Meanwhile,the vehicle window time is used to carry out maintenance,so that the vehicle maintenance work can be divided from centralized maintenance to balanced maintenance,so as to ensure the operation of vehicles during peak passenger flow period.Taking a metro company as an example,after the implementation of balanced maintenance,the number of vehicles stopped for maintenance is greatly reduced and the utilization rate of vehicles is increased.Secondly,on this basis,the vehicle health status assessment provides the basis for optimizing the maintenance plan.Based on analytic hierarchy process(AHP)and fuzzy comprehensive evaluation method,a health assessment model of metro vehicles is established,and the maintenance level corresponding to the evaluation results is determined,and the maintenance rules are dynamic.Carry on the health assessment to the vehicle condition,determine the level of the maintenance task according to the evaluation result,shorten the maintenance time and improve the vehicle availability.Taking a metro company vehicle as an example,the rationality of the model is proved.Finally,in the maintenance stage,based on lean thinking,Single Minute Exchange of Die(SMED)theory is introduced to improve the maintenance efficiency.In the process of maintenance,we make full use of the maintenance resources and use the parallel operation mode to work on the roof,body and under the vehicle simultaneously.At the same time,we optimize the maintenance process of assembly parts,use the vehicle maintenance BOM,and use the "racing car" maintenance idea for reference to optimize the vehicle maintenance and parking time,so as to ensure the vehicle on-line rate.