Dynamic Performance Analysis And Parameter Optimization Of Rapid-Speed Wagon

Since its formal operation in the early 19th century, the railway transportation has always been the most important transportation mode and plays a quite important role in economic development across the globe based on its advantages, such as large traffic volume, rapid speed, great safety, energy-saving superiority and environmental protection. Currently, Chinese government has newly built a great number of high-speed railways, promoted high-speed passenger transport and created the conditions for the freight transport as well. In addition, higher demands has been put on the speed of freight train so as to reduce the velocity contrast of both passenger and freight trains and make full use of transportation capacity of high-speed railway; on the other hand, in order to provide high added-value freight transport service, such as container, cars, parcel transportation and livestock perishable, promoting safety and velocity for freight transport is imperative. Under the above-mentioned background, Dynamic Performance Analysis and Parameter Optimization of Rapid-speed Wagon was researched.Based on the analysis of the structure of rapid speed freight bogie and flat car, the modeling theory of Vehicle System Dynamics and Rigid-Flexible coupling multibody system were briefly explained. The finite element model of flat car body was established by applying Pro/Engineer, ANSYS softwares,as the same time, the modal analysis and Substructure analysis were carried out. Secondly, a multi-body and Rigid-Flexible coupling dynamic simulation model is established by SIMPACK software.Based on the multi-body and Rigid-Flexible coupling dynamic simulation model, the dynamic performance of vehicle system was analysed., the rules of parameters influence were discussed and the parameters of the bogie and car body were optimized.In addition, the calculation results of the Multi-body and Rigid-Flexible coupling dynamic simulation model were compared.The influence of car body elastic deformation on vehicle dynamic performance was discussed. The analysed result shows that the bogie suspension parameter and car body parameter upon optimized could all meet the dynamic performance and provide theoretical support for developing the rapid freight bogie; Considering the elastic body, as the structure of the body vibration, had certain influence on the horizontal and vertical vibration response of the empty car system and large influence on the Vertical response of the loaded car system;The body elastic had reduced the critical speed with slight drop, and the loaded car decreased larger than the empty car; running stability and dynamic curve negotiation were under influence of different degree, but much greater on loaded car than on empty car.