Proceedings of the 16th International Congress on Sound and Vibration vol:CD-ROM
International Congress on Sound and Vibration edition:16th location:Krakow, Poland date:5-9 July 2009
Vibrations induced by the passage of underground trains are a major environmental concern in urban areas. In practice, vibrations are often predicted using empirical methods, like the Detailed Vibration Assessment procedure of the Federal Railroad Administration (FRA) of the U.S. Department of Transportation. This procedure allows predicting ground surface vibrations and audible noise in buildings. Ground vibrations are calculated based on force densities, measured when a vehicle is running over a track, and line source transfer mobilities, measured on site to account for the effect of local geology on wave propagation. Compared to parametric models, the great advantage of this approach is that it inherently takes into account all important parameters. It can only be used, however, when an appropriate force density of the train passage is present. In this paper, the empirical prediction of the FRA procedure is verified by means of numerical simulations with a coupled finite element - boundary element (FE-BE) method. More particularly, the coupled FE-BE method is used to verify the underlying assumptions and accuracy of the Detailed Vibration Assessment procedure of the FRA.