High-frequency vibration characteristics of wheels in wheel-rail system

A coupling vibration model of vehicle-track-subgrade system was established, track irregularities and the contact filters in wheel-rail contact areas were considered, and wheel-rail vertical random forces were simulated.A 3D entity finite element model of wheel system was established, three contact positions were considered, including the nominal contact point, rim and lateral of wheel, and the vibration characters of wheel system in high-frequency domains due to vertical random forces were analyzed.Analysis result shows that the vibration acceleration responses of wheel rim, radial plate and wheel hub are 870, 493 and 457 m·s^-2 respectively when train runs on ballast track at 200 km·h^-1, the response of rim is highest, and the response of wheel hub is lowest.When the nominal contact point, rim point and outer of wheel were excited respectively, the vibration acceleration responses of radial plate are 563, 492 and 301 m·s^-2 respectively, the vibration response of radial plate due to the excitation on the nominal contact point of wheel is highest.The high-amplitude vibration spectrum of each part of wheel distributes in 1 000-3 000 Hz, and the frequencies of the maximum vibration acceleration on wheel are about 1 400 Hz, the vibration responses in higher-frequency domains are not prominent due to the strong role of wave number filter.