Vibration isolation design of under chassis equipments for high-speed EMU trains

摘要

To investigate the effects of the under chassis suspended equipment on carbody eigenfrequencies, a numerical method for calculating the eigenfrequencies of a high-speed EMU vehicle carbody with suspended equipment is proposed, and the design of the equipment suspension parameter according to the principles of mode matching, transmissibility matching and consider the optimal vibration of both carbody and equipment as the objective is presented. Results show that by tuning the equipment suspension stiffness, the first vertical bending frequency of carbody will have a 'frequency hopping' phenomenon; The first vertical bending frequency of carbody could be enhanced by means of equipment with optimized suspension parameter to suppress the vibrations of both the carbody and the equipment.