Experimental Analysis of the Car Body Suspended Equipment Vibration for High-speed Railway Vehicles

Abstract

Existing researches state that the rigid-flexible coupling vibration of the car body and car body suspended equipment deteriorates the ride comfort of a high-speed train, but a few works validate it through field tests. In this investigation, field measurements on the vibration of bogie, car body and car body suspended equipment of a high-speed train was carried out to reveal their coupling interaction characteristics. A design solution for the equipment suspension frequency is then summarized by its weight and excitations bears on. Tests show that bogie dominates a lateral vibration at 4.5 Hz in normal track segments but it rises to 7.4 Hz while hunting occurs. The equipment acceleration is significantly larger than that on car body since the high-frequency vibration bears on it is well isolated from the car body. When bogie hunting occurs, a structural resonance on the car body was noticed, and the lateral and vertical acceleration on equipment rise to 0.2 g and 0.4 g, respectively, with respect to 0.1 g and 0.2 g in a normal case. The vibration discrepancy on the equipment among track lines is quite obvious.