Author:

Keywords:

Science & Technology, Technology, Acoustics, Engineering, Mechanical, Engineering

Abstract:

The vibration generated by railway traffic causes complaints not only about sensible vibration levels, but about significant noise levels in the building lying beside or above rail lines. Therefore numerical methods to predict the effect of train passbys are very important to possess and to develop. This paper presents a new numerical prediction method based on the Rayleigh radiation integral which allows us to calculate sound pressure levels inside a cavity when the normal velocity distribution along the boundary surfaces are known. For validation the method was compared to the Boundary Element Method by means of calculations on theoretical rooms with theoretical velocity distributions along their walls. Beside these calculations, thorough measurements were carried out in buildings - mostly monolythic concrete portal frame structure buildings. Synchronous, multi channel recordings of vibration and noise signals were performed. The results of the measurements and the simulations showed good agreement and are also presented in this paper. Both the development and the validation of the new method was done within the CONVURT project.