Rail vehicle source assessment within a virtual certification process

• The present paper aims at giving an overview of the vehicle noise source modelling work carried out within the Acoutrain FP7 European research project. Results are presented for several areas including: equivalent source modelling concept applied to typical train sources, component based models for aero-acoustic noise generation of pantographs and installation effects of bogie and roof mounted sources. A process to characterize vehicle noise sources in an industrial context is presented. It is shown that equivalent monopole models, for which the source is described by a few monopoles, can be applied to represent real vehicle sources. It is also displayed how analytical models can be used to calculate the insertion loss of screens for sources that can be represented by point sources. Ray tracing and energy BEM models are used to determine the high frequency installation effect of a source in the bogie and a practical, procedure for in-situ testing of installation effects is suggested. For high speed applications a component based model is shown to accurately represent the spectrum of a train pantograph. It is concluded that the results to date are promising but more work is needed to validate the proposed process and methods for real vehicle installations in terms of modelling accuracy and usability in a virtual testing framework for TSI certification purposes.

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