关键词: 动车组维修, 机会维修, 重要度评价, 可靠度, 预防性维修

Abstract: In view of the current maintenance mode of EMU trains in China, the opportunity maintenance strategy of EMU multi-component system based on the Integrated Importance Measure (IIM) is proposed, and the key components that contribute greatly to improving the reliability of the system are maintained on time first. The calculation model of the IIM of components is established, and the maintenance priority of components is sorted according to it. The optimal maintenance cycle and time of a single component are calculated with the goal of minimizing the total maintenance cost, and the opportunity maintenance model of a multi-component system considering the importance is established with the goal of minimizing the total maintenance cost of the system and the maintenance time of key components as the downtime of the system. The four component system replaced during the four-level repair of a certain EMU is selected as the research object to discuss the impact of the size of the opportunity maintenance mileage window and its offset on the maintenance effect. The comparison results show that the opportunity maintenance strategy considering the IIM can ensure the reliability of the key components that contribute greatly to the system reliability, and thus ensure the overall reliability of the system, under the condition that the maintenance cost is basically the same.

Key words: EMU maintenance, opportunity maintenance, importance evaluation, reliability, maintenance cost