Vibration and Radiated Noise Computation from Railway Systems Using a BEM Methodology
54º Congreso Español de Acústica — Tecniacústica 2023
Abstract
This work studies vibration and radiated noise from railway systems using the 2.5D Boundary Element Method (BEM) formulation in the Bézier-Bernstein space. The proposed method allows the representation of the exact geometry of the track as it is done in Computer-Aided Design (CAD) models. Thus, it is possible to evaluate problems with complex geometries, which are usually not adequately represented by the standard BEM and FEM formulations. Radiated noise is computed from the normal displacement at the boundary of the rail system according to the integral representation of the sound pressure. Only the track boundary is meshed, as the radiation condition is implicitly satisfied in the BEM fundamental solution. Moreover, the methodology allows the use of arbitrary high-order elements, making it efficient for the computation of radiated noise at high frequencies. The performance of the proposed method is shown by studying the mobility and the radiated noise of an 'open' rail section.