Analysis of Excitations Bears on a Railway Vehicle through Wheel/rail Contact

Through frequency analysis, the excitation of railway vehicles is divided into track excitation, wheel/rail interaction excitation and vehicle hunting excitation. Track excitations is summarized both for the existing railroad tracks and newly built high-speed railroad tracks, in which the main frequency is obtained. Then the wheel/rail interacting excitations resulting from the wheel and rail profiles' roughness are concluded, which contribute high-frequency vibrating on the vehicle and track. Furtherly, the hunting excitation of vehicle itself is concluded through presenting the wavelength of a free wheelset hunting and a bogie hunting. It is concluded that a vehicle, especially a high-speed train, bears a wide range of excitation frequencies from the track geometry, wheel/rail interaction and vehicle hunting.