Abstract
An on-site test has been performed to address the problem of feet numbness caused by the floor vibration of high-speed railway vehicles. Analysis of the floor vibration performance indicates that the vibration of the car body chassis transmitted to the floor by the elastic supports is significantly amplified in the frequency range of 20–50 Hz. This overlaps with the frequency range in which human lower extremities are most sensitive, leading to feet numbness. A refined finite element model of the car body, including the floor panels is developed to further study the vibration mechanism of the floor. Results show that due to the inappropriate design of the elastic support stiffness, the deformations of the floor above the bogie centre for several typical modes in the frequency range of 20–50 Hz are significantly amplified. When the excitation frequencies transmitted from the car body chassis were close to the eigenfrequencies of the floor, the local resonance of the floor will occur, which is the root cause of human feet numbness. The dynamic stiffness of the elastic support is further optimised, and the experimental verification shows that the vibration transmissibility from the car body chassis to the floor in the frequency range of 20–50 Hz has been significantly reduced, and the problem of feet numbness has been solved.
Highlights
Under the high-speed operational conditions, the vibration environment of the high-speed trains deteriorates rapidly, and the high-frequency elastic vibration of the car body is significantly increased;[1] the vibration of internal structures of the car body is increasingly severe
Gong et al.[3,4,5,6] present studies where the dynamic condensation method was applied to the finite element (FE) model of the car body, and the three-dimensional rigid-flexible-coupled dynamic model of railway vehicles which included the car body elasticity was developed
Results show that the vibration of the floor is amplified in the frequency range of 20–50 Hz
Summary
Under the high-speed operational conditions, the vibration environment of the high-speed trains deteriorates rapidly, and the high-frequency elastic vibration of the car body is significantly increased;[1] the vibration of internal structures of the car body is increasingly severe. The researches on car body vibration of high-speed trains have received high attention. In these studies, the rigid-flexible coupled dynamics model including the car body elasticity was mainly utilized. A vertical rigid-flexible-coupled dynamic model of railway vehicles was proposed, and the effects of the car body elasticity on the ride comfort were studied. The work of Zhou which found that the elastic vibration of the car body had a great influence on the ride comfort with the increasing running speed of the vehicles. Gong et al.[3,4,5,6] present studies where the dynamic condensation method was applied to the FE model of the car body, and the three-dimensional rigid-flexible-coupled dynamic model of railway vehicles which included the car body elasticity was developed. The vibration and ride comfort of the car body under different operational conditions was studied
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