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摘要
High-speed subway trains are a new type of subway train with a maximum operating speed of up to 160 km/h, far surpassing the maximum speed of regular subway trains at 80 km/h. Their vehicle mechanics are similar to high-speed trains, and their track operating conditions are similar to those of regular trains. Vertical vibrations of subway trains affect the upper structure′s power supply and force performance. Currently, the vibration characteristics of high-speed and regular subway trains on their respective tracks have been extensively studied, but research on the vibration characteristics of high-speed subway trains on regular railways is still lacking.This study focuses on the vehicle vibration characteristics of high-speed subway trains operating on regular tracks. A two-dimensional finite element model of the train-wheel-track system for both regular and high-speed subway trains is established using OpenSees software. Twenty 440 m long track irregularity samples are randomly generated based on the spectrum characteristics of China′s regular tracks. By using the finite element method, the vertical displacement response and statistical parameters of both regular and high-speed subway trains are analyzed at different operating speeds and different smoothness levels. The study investigates the variation law of vertical vibrations of high-speed and regular subway trains with changes in operating speed.The research reveals that the vibration caused by track irregularities for high-speed subway trains and regular subway trains is much greater than that on smooth tracks. There are differences in the variation characteristics of vertical vibrations with speed between high-speed and regular trains. The vertical vibration displacement amplitude of high-speed trains is much smaller than that of regular trains, making the vibration of high-speed trains more stable compared to regular trains. ? 2023 Science Press.
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