Maintenance Decision Research Of Keycomponent On Train-set Bogie

Bogie is the key component to guarantee a reliable and safe operation of train-set. And bogie maintenance is to essential for the train-set to realize the operation safely, reliably and efficiently. When the bogie failure occur, if maintenance is not conducted timely, can lead to system operation interruption, even threat to people’s life and property safety. If maintenance is not conducted appropriately, it may lead to "insufficient" or "excess" maintenance for the bogie. Therefore this paper chooses the train-set bogie as the research object. Establish relevant mathematical models on the three steps of maintenance decision process which conclude the maintenance mode determination, the planned maintenance interval and the opportune moment of on-condition maintenance. The methods of maintenance decision are used to solve the problems such as the improper maintenance, insufficient or excess planned maintenance and improper moment of on-condition maintenance effectively. And provide theoretical basis for optimization of repair class and repair system of train-set bogie.On the foundation of the summary of structure characteristics, function and principle of the train-set bogie, analyze the factors influencing the decision making process of maintenance, divide the maintenance model and analyze the corresponding failure laws. Establish the bogie evaluation model of important components, and provide a reference for key parts maintenance model decision of bogie. Based on the current situation that the train-set bogie appeared in the process of practical maintenance "insufficient maintenance" or "excess maintenance", establish the evolution of failure rate combined the age reduction factor and failure-rate acceleration factor during planned maintenance. Establish the maintenance interval models during a planned maintenance and an overhaul period. Choose the reliability and availability as constraints. Choose the minimum maintenance cost per unit time as objective function and use the genetic algorithm to obtain the optimized solution. On the condition of improper moment of on-condition maintenance, establish the Weibull proportional intensity model to describe the relationship between the bogie life distribution and the adjoint variables. Apply physical programming method to solve the optimal maintenance threshold under the condition that guarantee the reliability and maintenance cost per unit time within the expected range. And then determine the he opportune moment of on-condition maintenance.This paper puts forward the evaluation model of important components of train-set bogie. Determines ranking and maintenance mode of the important components of bogie subsystem, and provide a theoretical reference for practical train-set bogie maintenance mode optimization. The optimal maintenance interval and maintenance times in an overhaul cycle of bogie are obtained by applying the decision-making model of planned maintenance interval. Reduce the maintenance times of overhaul period, decrease the consumption of human and financial resources and increase the train-set actual operating time under the premise of guarantee the reliability and availability requirements. Using Weibull proportional intensity model of and maintenance threshold and combining with historical fault statistics the on-condition maintenance moment decision diagram of bogie is obtained. The recommendations that the bogie maintenance moment decision diagram presenting are in accordance with the actual on-site maintenance decision of the bogie.Therefore, the maintenance decision research did in this paper on train-set bogie provide a good theoretical basis for the optimization of repair class and repair system. The established maintenance decision models are also applicable to the other complex system maintenance decision research.