Comparison of Simulation and experimental Results of Railway Vehicle Dynamics by Using 1/5 scaled model

초록

The similarity model is used for finding the dynamic characteristics of large structure like railway vehicle because of difficulties in experimental condition and cost. Generally 1/5 scaled model of roller rig is used to find running stability and limit speed of 1/5 scaled bogie in railway vehicle system. There are some 1/5 scaled model of roller rig, and they are used only for bogie dy-namics. There is not 1/5 scaled roller rig for railway vehicle including bogie and carbody. In this study, the 1/5 scaled roller rig for 1/5 railway vehicle was manufactured in order to find vehicle running stability and limit speed. Before producing the 1/5 scaled roller rig, the scaling factors were reviewed according to the Prof. Iwnicki's similarity method which was used for finding sacled bogie dynamics. Nevertheless of 1/5 scaled model, the roller rig for full vehicle model is still expensive. Therefore we make the scaled roller rig for half vehicle model. In order to verify the similarity method used in this study, the mathematical equation for 17 DOF vehicle model was introduced for lateral dynamic motion. The limit speed of full vehicle model and 1/5 scaled model were compared each other. The tendency of limit speed according to the some suspension parameter and wheel conicity was compared also. Finally, we produced 1/5 scaled half vehicle model. The simulation results and experimental results by using scaled roller rig were studied and compared. There was good correspondence between simulation results and experimental one. The scaled roller rig produced for finding lateral dynamics of half vehicle model can be used to study the vehicle dynamics, limit speed and control algorithm for (semi-)active suspension system. of railway vehicle.