Spatial Frequency Domain Transfer Characteristics of Vertical Vehicle-track Coupling System

doi:10.3901/JME.2023.24.231

Abstract

Abstract: Based on vertical vehicle-track coupling system, both considering ballast track and non-ballast track model, the transient spatial frequency transfer function from wheel-rail irregularity to state variables of the various components of the vehicle and track system is established. With the transient spatial transfer function, under different track system, the similarity and difference of the acceleration amplitude frequency transmission characteristics of the vehicle components and the interaction between the components of track system are studied. The ratio between the number of sleepers and the number of track modal is obtained in order to get a more precise transfer characteristics of the vehicle components. Under different operating conditions such as uniform and variable speed process, the differences of the transfer characteristics of vehicle system components are analyzed. The results show that, with the speed of 250-350 km/h, the main energy transfer range is 0.4-1.2 (1/m) and 6-8.5 (1/m). Under ballast track system, the transmission characteristic’s peak of the wheel-rail force is at the frequency range of 0.8-1.6 (1/m). Under ballastless track system, the peak value of wheel-rail force transfer characteristics includes t two spatial frequency ranges of 0.7-1.2 (1/m) and 4-8 (1/m). With the increase of distance, the strip of the transmission characteristics are moving to the direction with a space frequency decreasing, and the higher the frequency range is, the larger the moving trend is.

Key words: vertical vehicle-track coupling system, spatial frequency domain, transfer characteristics, uniform and variable speed process

CLC Number:

U270

XU Ning, YANG Guangxue, YANG Chao. Spatial Frequency Domain Transfer Characteristics of Vertical Vehicle-track Coupling System[J]. Journal of Mechanical Engineering, 2023, 59(24): 231-241.

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