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http://dx.doi.org/10.7782/JKSR.2015.18.4.289

Numerical Analysis of Rail Noise Regarding Surface Impedance of Ground by Using Wavenumber Domain Finite and Boundary Elements  

Ryue, Jungsoo (School of Naval Architecture and Ocean Engineering, University of Ulsan)
Jang, Seungho (Korea Railroad Research Institute)
Publication Information
Journal of the Korean Society for Railway / v.18, no.4, 2015 , pp. 289-300 More about this Journal
Abstract
An important source of noise from railways is rolling noise caused by wheel and rail vibrations induced by acoustic roughness at the wheel-rail contact. In conventional approaches to predicting rail noise, the rail is regarded as placed in a free space so that the reflection from the ground is not included. However, in order to predict rail noise close to the rail, the effect of the ground should be contained in the analysis. In this study the rail noise reflected from the ground is investigated using the wavenumber domain finite element and boundary element methods. First, two rail models, one using rail attached to the rigid ground and one using rail located above rigid ground, are considered and examined to determine the rigid ground effect in terms of the radiation efficiency. From this analysis, it was found that the two models give considerably different results, so that the distance between the rail and the ground is an important factor. Second, an impedance condition was set for the ground and the effect of the ground impedance on the rail noise was evaluated for the two rail models.
Keywords
Rail noise; Ground impedance; Wavenumber finite element/boundary element method;
Citations & Related Records
Times Cited By KSCI : 3  (Citation Analysis)
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