Abstract
The coupled vehicle/track dynamic model is formulated through integrating a high-speed rail vehicle model with a slab track model via the wheel/rail contact model. The sliding window method is improved using the least square criterion to simulate the vehicle travelling along the infinite long track. The steady-state responses of a high-speed vehicle induced by the discrete sleepers and slab segments are investigated through numerical simulation and analysis of the experimental results. Also the validity of the coupled vehicle/track model is examined through comparing the simulation results with those acquired from field test measurements. The experimental and numerical results show that the wheel/rail contact forces fluctuate considerably as long as the sleeper passing frequency approaches the frequency of P2 resonance (wheelset and rail bouncing in phase on the slab). Increasing the damping of rail pads and primary suspension can lower the steady-state response amplitudes at the resonance region. The oscillations in the wheel/rail normal forces arising from the discrete slab segment excitation can be reduced by increasing the support stiffness of the CAM (cement asphalt mortar) layer under the slab.
Highlights
E steady-state responses induced by the discrete sleeper support are illustrated with the experimental data obtained from a high-speed train running on the Ha’erbinDalian (HD) high-speed railway line. e steady-state responses to the slab segment excitation are measured from the Zhengzhou-Xuzhou (ZX) high-speed railway line. e experimental data acquired in different seasons are compared in the frequency domain to illustrate the influences of the temperature change on the steady-state responses of the rail vehicle
It can be seen that the unsprung mass poses significant influences on the wheel/rail dynamic factor and the axle box acceleration. e increasing unsprung mass increases the wheel/rail force and decreases the P2 resonance frequency and the amplitude in the axle box acceleration owing to the larger inertia
A coupled vehicle track dynamic model is formulated through coupling a high-speed rail vehicle with slab track via wheels/rails in rolling contact, in which a sliding window method together with the least square criterion is proposed to simulate the train travelling on an infinite long track. e sliding window method is proved to have reasonable accuracy and efficiency through comparing wheel/rail normal forces with those obtained via the existing moving mass model and the moving irregularity model
Summary
State Key Laboratory of Traction Power, Southwest Jiaotong University, Chengdu 610031, China. E steady-state responses of a high-speed vehicle induced by the discrete sleepers and slab segments are investigated through numerical simulation and analysis of the experimental results. 1. Introduction e steady-state response of a rail vehicle, caused by the excitation arising from the periodically discrete support under the rail such as sleepers and slabs, can lead to periodic oscillations in both the wheel/rail normal forces and the axle box accelerations. Is model is capable of predicting the dynamic responses induced by the track irregularities, while the excitation caused by the discrete support under the rail is neglected. E moving mass model represents the vehicle as a mass moving on the rails with respect to the track and track irregularities, which is commonly considered as a more realistic representation of the wheel/rail interaction and the excitation arising from the discrete support under the rails
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