Conference_programme: 16: Railway noise

Lecture: In-situ source characterisation on a light rail vehicle

Author(s): Böhm Jenny, Hecht Markus, Isert Nathan, Martner Otto

Summary:
Noise is a major issue of the otherwise environmental friendly railway. Exposure to railway noise can cause annoyance and may have an impact on public health. Interior rail noise affects passenger comfort and thus the attractiveness and acceptance of rail transport system. The European research project DESTINATE “Decision supporting tools for implementation of cost-efficient railway noise abatement measures” addresses this issue. DESTINATE is a non-member project funded by the Shift2Rail Joint Undertaking, a Horizon 2020 initiative. DESTINATE aims to promote modal shift from road to rail transport by facilitating informed decisions on railway noise mitigation alternatives.\n\nOne technical objective of DESTINATE is to develop a prediction model for the interior sound based on OTPA/TPA measurements at a light rail vehicle. In this the synthetisation of the interior sound field from the OTPA is extended to incorporate moderate design changes or even the exchange of individual sound sources. The results are time-domain signals that may directly be used for an auralisation, which in return allows for assessing the changes in regard to the human perception. In-situ structure-borne sound source characterisation measurements were carried out to study the effect of modified sound sources. An HVAC (heating, ventilation and air conditioning) unit on the train roof was used for these measurements. Blocked forces were determined from the coupled mobility and coupled operational velocity at the contact points for the HVAC mounted rigidly on the train roof. For validation purposes the coupling elements were exchanged. This paper presents the results of the in-situ source characterisation and discusses the viability and limitations of the approach.\n

Corresponding author

Name: Ms Jenny Böhm

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Country: Germany