Dynamic Performance Analysis And Modeling Optimization Of Freight Wagon

High-speed and heavy haul have become the time theme of the development of rail transport. High-speed is effective to reduce the running time and increase economic efficiency. However, with the increase of the running speed, it is probable to provoke a frequency of vehicle systems, which seriously deteriorates the vehicle dynamics performance. The heavy haul transportation can practically increase the load of train while it also generates many problems, such as the change of body natural frequency, the reinforced coupling effect between components when loading the goods. Therefore the elastic deformation of vehicle components on vehicle dynamics has become the main consideration.In this thesis, the basic theory of the computational multi-body dynamics was recalled especially for the theoretical basis of Rigid-Flexible coupling multibody system dynamic in SIMPACK. Then three-dimensional models of Gondola car body and Zhuan K6bogie side frame and Bolster were established based on Pro/Engineer. After that, the finite element model was obtained using both HyperMesh and ANSYS. The modal analysis and sub-structural analysis for car body under empty and weight condition were carried out. Finally, a multi-body and four Rigid-Flexible coupling dynamic simulation model under empty and weight condition were by using SIMPACK software.Compared with model results of empty and full loaded open boxcar, it is found that the empty car models have exactly the same shapes to the full loaded car models, while the frequencies of the same shape are different—the heavy ones are higher than the full loaded models, which provides a reference for body Lightweight Design. Based on the multi-body and four Rigid-Flexible coupling dynamic simulation model under empty and weight condition, the dynamic performance of vehicle system was investigated for the effect of elastic deformation of the various components on the performance of vehicle dynamics, which helps to propose the optimal modeling method, that is to say, the flexibility of car body is the primary concern when studying the vibration response. Besides, for the system dynamic performance, the vehicle running stability and smooth, the flexibility of car body, side frame and Bolster are negligible. Finally, as we evaluate the dynamic performance in curve, it is very necessary to consider the flexibility of car body and the bogie side frame. These above findings are helpful to establish a dynamic model efficiently and accurately.