Structure Simulation Of Auxiliary Converter Cabinet In The 200km/h Electric Locomotive

In order to meet actual requirement about locomotive travelling at speed 200km/h in passenger special line in our country, and much better to satisfy raising train speed on the existing main lines, we are developing the new generation 200km/h electric locomotive. Electric drive system is an extremely important part of the locomotive. Auxiliary converter cabinet is an important device in the locomotive electric drive domain, in which there are many electrical equipments. They depend on each other, restrict each other. They are very important for the electrical properties realization.With the continuous increase of the locomotive speed, comprehensive loading effect, the longitudinal, horizontal and vertical impact and vibration which the train bear become more and more complex in the train operation process. Operation conditions of vehicle body and installing structure including hanging devices become worse. The cabinet's structural strength and properties of vibration can directly influence normal operation of electrical apparatus in the cabinet, even affect the operation safety of trains. Therefore, we must carry on the strength analysis and modal analysis of the cabinet to ensure the reasonableness of design and safety of the practical application in the design stage.In this paper, computer simulation analysis software CATIA is used to model the auxiliary converter cabinet in the 200km/h electric locomotive. Based on the structural characteristics of cabinet, finite element analysis software HyperWorks is used to establish the finite element model of cabinet. This cabinet and inner equipments are connected by rivet and bolt. The simulation method of rivet and bolt connection is different from welding. Aiming at particularity of the connection way, rigid elements are adopted to simulate bolt and rivet connection, mass elements are used to simulate electrical equipments in the cabinet. According to the standard EN 61373, carries out intensity vertification of the cabinet body under inertial force, then analysis the modal of the cabinet. The results show that the largest equivalent stress of the initial structural is greater than the allowable stress 220MPa, the structural strength of cabinet doesn't conforms with standard. So improvement is done to the weakness parts of cabinet, then the strength checking and modal analysis are carried out to the improved cabinet. The analysis results show that the largest equivalent stress of the improved structure is less than the allowable stress of material, each order frequency is greater than 20Hz which meet the requirement of the standard. This improvement ensures the strength of the structure and improves its natural vibration characteristics to avoid resonance phenomenon of the cabinet body as well as the electrical components, and ensures the safety of the practical application. So, the results provide the theoretical basis for the research and development of the auxiliary converter cabinet in the 200km/h electric locomotive.