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Conference_programme: 16.2 - Rail Traffic Noise and Vibration: modelling and measurement

Lecture: Virtual certification of acoustical performances of a railway vehicle

Author(s): Aubin Fabrice, Poisson Franck, Chauffour Claire

Environmental noise is a key issue for the growing of railway traffic. In Europe, the environment noise radiated by the railway system is constrained by : Technical Specifications for Interoperabilty (TSI) which limits the noise at source and the national legislation of various Europeans countries which limits the noise at the receiver position or imission point. The TSI noise compliance is checked for each new type of train. Hence during the type test the rolling stock shall be representative of the future commercial one. During the development phase virtual certification is used in order to forecast the noise level at emission point (TSI limit) For acoustic performances, stand still and pass-by noise must be quantified according to measurement standards. A quiet and “free field” area is needed for stand still measurement as pass-by measurement must be carried out on a TSI compliant track. The acoustic performances of the TSI track guarantee that the rolling noise radiated by the track is lower than the rolling noise radiated by the rolling stock.\nThe stakeholders want to reduce the time to market of the new trains and the cost of the certification process. One technical alternative of the measurement campaigns is to calculate the stand still and the pass-by noise of the train and to compare them to the reference values of the TSI. The development of the virtual certification has been supported through several European research projects since 10 years. ACOUTRAIN project was dealing with acoustics and provide a simulation tool and a complete set up to carry out virtual certification in acoustics.\nThe paper will explain how virtual certification can be introduced. The characterisation of acoustic sources, the simulation tool, and the combination of measured and calculated values will be presented. Even if virtual certification is not yet introduced in TSI noise, SNCF is already using pass-by noise calculation to provide “expert point of view” on the acoustic impact of train modification. Then, the example of the modification of a TGV will be investigated. As a conclusion of the paper, the next steps to develop virtual certification in acoustics will be discussed.\n

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Corresponding author

Name: Dr Franck POISSON

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Country: France