Research On Joint Maintenance Decision Of Railway Wagons Coupler Buffer Device Based On Monte Carlo Simulation

The coupler buffer device is an important part of the railway wagons,and the scientific nature of its maintenance setting affects the safety of the vehicle operation and the operating cost.With the continuous advancement of the high-speed and heavy-load strategy and the increase in the usage of trucks,the maintenance and management of the coupler buffer device has brought huge challenges.The existing periodic full-line maintenance strategy lacks sufficient scientific basis and is difficult to meet the requirements of refined management,so it is urgent to formulate a new maintenance strategy.However,due to the large number of the coupler buffer device components,complex structure and limited accumulation of failure law research in the early stage,it is difficult to obtain the analytical solution of the maintenance strategy optimization model,and the practical application ability of the model is limited.Thus,this thesis uses Monte Carlo simulation method to study the joint maintenance decision strategy of the coupler buffer device.Firstly,since the incomplete and inaccurate data that are common in the actual maintenance field data,the likelihood method considering truncation and censoring are adopted to study the life distribution of important parts of the coupler buffer device,such as the type-16 H hook knuckle,the type-16,type-17 hooks,drawing bar,type-16 hook tail frame,type-17 hook tail frame and buffer.It provides support for simulation research and maintenance strategy research.Secondly,in view of the random failures in the actual maintenance process of the various components of the railway wagons coupler buffer device,comprehensively considering various maintenance restrictions such as preventive maintenance when components are not broken down,delayed replacement when failures occur,mandatory scrapping when their design life is reached,and early scrapping with the entire vehicle,etc.,under the framework of the preventive maintenance strategy of equal period,based on the incomplete maintenance theory and Monte Carlo simulation method,the singlecomponent preventive maintenance model of the coupler buffer device is constructed.With the goal of minimizing the average operation and maintenance cost of a single component throughout the entire cycle,the optimal preventive maintenance cycle of a single component is obtained,and the full cycle description of the single component operation and maintenance process during the study period is realized.Finally,based on the simulation model of single component preventive maintenance,considering the economic correlation among the components of the coupler buffer device,the simulation process of joint maintenance decision was given under the random combination of preventive maintenance cycles of each component in the coupler buffer device system.To minimize total cycle average operational costs as the goal,the optimal preventive maintenance cycle combination of each component of the coupler buffer device system was obtained.Through the comparison with the existing periodic full-line maintenance strategy,verified the superiority and feasibility of this maintenance strategy,and discusses the related model parameter sensitivity and the relationship between the spare parts and maintenance strategy..This research provides help for the upgrading of the railway wagon coupler buffer device to the condition-based maintenance.