Study of A Method for Suppressing Vertical Bending Vibration of High-speed Trains

Linling Wang; Meng Xu; Junjie Chen; Xiaolong He

doi:10.6919/ICJE.202506_11(6).0002

Authors

Linling Wang
Meng Xu
Junjie Chen
Xiaolong He

DOI:

https://doi.org/10.6919/ICJE.202506_11(6).0002

Keywords:

High Speed Train; Vehicle Anti-bending System; Longitudinal Stiffness; Ride Comfort Index; Modal Vibration.

Abstract

This paper presents a method to suppress the vertical bending modal vibration of vehicles. The method controls the elastic vibration of the vehicle by placing anti-bending devices longitudinally under the vehicle to suppress vertical bending deformation. In this paper, the dynamic system of a high-speed train with a bending device is established. The influence of the bending device's stiffness and installation position on the vertical bending mode frequency of the vehicle is analyzed, and the variation range of the bending device's parameters is determined. The vibration response of the vehicle system is solved using the numerical integration method. The variation trend of the comfort index is researched by introducing the vehicle's comfort index. The effect of the anti-bending device on the ride comfort of the vehicle and the influence of the anti-bending device on the modal vibration are discussed separately. The results show that the anti-bending device can significantly reduce the vibration amplitude of the vehicle at the vertical bending frequency. When installed in the middle of the vehicle, the anti-bending device can greatly increase the vertical bending modal frequency of the vehicle. The device can significantly affect the ride comfort index of the middle vehicle in the interval of 270 km·h^-1 ~ 340 km·h^-1. The longitudinal stiffness should be at least 1000 MN·m^-1 to improve the comfort of the middle vehicle under the condition of 300km·h^-1; and the bending stiffness of 1000 ~ 1800 MN·m^-1 attenuates the vehicle vertical bending vibration when the vehicle speed is lower than 350 km·h^-1. The stiffness of the anti-bending device increases gradually when the speed is higher than 350 km·h^-1. When the stiffness is higher than 1800 MN·m^-1, the device can attenuates the vertical bending vibration effectively within the 250~350 km·h^-1, and the highest attenuation is 54%.

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