Abstract
Long‐wavelength track irregularities have obvious influence on ride comfort and running stability of high‐speed trains. Meanwhile, it brings risk to the inspection of track irregularities since ordinary inspection equipment has difficulties in covering long wavelengths. Previous research on the effect of long‐wavelength track irregularities is rare. In order to find the relationship between long‐wavelength irregularities and vehicle dynamic responses, a numerical vehicle‐track coupling dynamic model based on multibody dynamics and finite element theories is established by using a self‐compiling program. One case study is given as an example to show the methodology of determining the sensitive long wavelength and management amplitude of track longitudinal‐level irregularities in high‐speed railway. The simulation results show that the sensitive long wavelength has a strong correlation with train speed and natural frequency. The simulation and field test results are in good agreement.
Highlights
As the main source of vehicle’s vibration, track irregularities obviously affect ride comfort and running safety [1,2,3,4,5]
Results and Discussion e dynamic responses of high-speed vehicles induced by long-wavelength track irregularities are simulated based on vehicle-track system dynamics model (VTSDM)
Because the natural frequency of railway trains is usually around 1 Hz and the ride comfort is related to sensitive long wavelength of track irregularities, the acceleration in the center of carbody is selected as an indicator to determine the sensitive wavelength values
Summary
As the main source of vehicle’s vibration, track irregularities obviously affect ride comfort and running safety [1,2,3,4,5]. Hung and Hsu [6] investigated the relationship between train speed, track irregularities, vibration level of carbody, and bridge using threedimensional finite element transient dynamic analysis and studied the influence of different parameters on vehicle vibration. Sadeghi et al [11] investigated the accuracy and effectiveness of two-dimensional and three-dimensional numerical models in predicting the influence of track irregularities on wheel/rail dynamic force. The research on long-wavelength track irregularities is mostly from the aspect of vehicle dynamics, and the influence of the track is rarely considered. E interaction between vehicle and track is carried out by wheel/rail contact as shown in Figure 5 [20]. E longitudinal level and track alignment irregularities under various running speeds are selected as examples for demonstrating the relationship between long-wavelength irregularities and dynamic responses of vehicles.
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