Influence of Ground Impedance on the Sound Radiation of a Railway Track
نویسندگان
چکیده
Railway rolling noise is radiated by the vibration of the rail and wheel. The TWINS model is well established as a method of predicting the generation of vibration and noise and this has been used successfully to design noise mitigation measures. However, the existing model used to predict the sound radiation from the rail considers the rail to be located in free space whereas, in reality, the rail is attached to sleepers or is located above the ballast or slab. Therefore it is necessary to take these boundary conditions into account in order to propose more realistic models. In this paper, boundary element method calculations are carried out to investigate the influence of the ground in close proximity to the rail on the sound radiation from both vertical and horizontal motion of the rail. Ground absorption is introduced using the Delany-Bazley model for the acoustic impedance and its effect on the sound radiation is shown. The results are verified by experimental results obtained using a 1/5 scale model with different kinds of ground impedance.
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