Study On Optimization Method About Maintenance System Of Diesel Locomotive

Taking the optimization of repair system and rule as the target, aiming at the existing combination phenomena of timing maintenance, over maintenance during the maintenance with circumstances, and lack of maintenance under the prevent repair system in planning, this thesis has highlighted and discussed the three key points about system reliability evaluation, locomotive damnification and inspection & repair period determination, and dynamic optimization of locomotive repair for the Diesel Locomotive in China, based up on theories of system reliability and system damnification of machine & electricity.1. The development trend for the theory and method of diesel locomotive maintenance & repair both in domestic and abroad has been studied and analyzed. According to the maintenance & repair theory which is focused on reliability, a research guideline has been confirmed based on the reliability and the accumulated damage degree of diesel locomotives, which is for optimizing the scope and period of inspection & repair and reducing the maintenance cost.2. A logically-resolution diagram of diesel locomotive's RCM maintenance has been put forward under the guidance of RCM theory, in combination with the features of domestic diesel locomotive's function, structure and maintenance and in light of the common failure modes.3. In order to evaluate the reliability of diesel locomotive systems, a block diagram has been established, a set of evaluation indexes on the reliability of each locomotive component, a calculation model on the reliability of machine & electricity and the evaluation method of the reliability of the series and parallel connections systems have been set up, and the calculation model and method of diesel locomotive system reliability has been put forward accordingly. 4. Based on the theories of linear accumulated damage and the difference between mechanism and electricity, an new concept of accumulated damage theory of diesel locomotive is put forward and the accumulated damage calculation model of diesel engine and traction motor has been set up, and a calculation method of whole locomotive accumulated damage and a technical schedule for key components detection on accumulated damage is presented according to the relationship of the series and parallel connections.5. In accordance with components' reliability and taking the expected system reliability as the target, a method of optimizing the component inspection range has been put forward through structure's sieving matrix in terms of the fixed inspection intervals. Thus an overmuch maintenance phenomenon has been largely reduced. Starting from the actual damage status of a diesel locomotive and taking the minimum cost of maintenance as the target, a calculation method of dynamic maintenance intervals has been raised through establishing a dynamic maintenance interval model.6. Based on the existing Domestic diesel locomotive data, the reliability, the accumulated damage degree and the optimization of the scope of inspection and repair of Diesel Locomotive have been calculated and analyzed through examples in this thesis. The result shows that the method stated in this thesis is feasible and could be a theory reference for improving China railway locomotive repairing level, reducing the cost of inspection & repair and making locomotive repair regulation.