High Speed Rail Characteristic Frequencies and Track Stiffness

摘要

This paper considers track vibrations induced by high -speed trains, both on slab track and at grade on ballasted track. In particular, some of the characteristic frequencies present are investigated. These include speed dependent parametric excitation frequencies related to the geometry of the system - for instance the rate with which bogies and axles pass above a given position in the track, or with which a wheel passes over the fasteners — and speed independent system aspects such as the loaded track vibration resonance. The circumstances under which these modes are most likely to coincide on high — speed rail systems are considered. Some conclusions are drawn on optimal range for the loaded track resonance, and so on the optimal track stiffness range under different train speeds required to provide this.