The TRANSIT project: innovation towards train pass-by noise source characterisation and separation tools

Abstract

The overall goal of the Shift2Rail project TRANSIT is to provide the railway community with a proven set of innovative tools and methodologies to reduce the environmental noise impact and improve interior acoustic comfort of railway vehicles. To predict overall noise levels accurately for stand-still or during pass-by, accurate separation and characterisation of the main contributing sources is required. Methods developed in TRANSIT are based on static characterisation and on measurements during pass-by to identify the sound power and directivity of the main sources of railway noise and establish their contribution to the total measured levels. These results are the input to exterior noise simulation tools. The main obstacle for current vehicle certification methods is the fact that the track is the main contributor to pass-by noise. TRANSIT is targeting this problem by developing methods to identify the contribution of vehicle sources and to separate the vehicle and track contributions to rolling noise, based on the most promising approaches from Roll2Rail. Validation tests for all these techniques are being carried out in collaboration with the FINE-2 project. Finally, acoustic meta-material designs are being developed for specific applications, within an HVAC duct and as a horn cover, to achieve high absorption and transmission loss at target frequencies. The initial assessment is promising and will be followed by measurements in realistic conditions.

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ORCID for David Thompson: orcid.org/0000-0002-7964-5906

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