Field studies on external noise maximum noise level of rolling stock

Introduction. Train traffic growth, commissioning of commuter trains approximation of residential development to railway lines exacerbate the problem of external noise from railway rolling stock. In order to develop measures, aimed at reducing the external noise level, specialists of the Railway Research Institute, VNIIZhT-Engineering and Scientific-Research and Design-Technology Institute of Rolling Stock jointly conduct comprehensive studies on environmental noise pollution. Since the regulatory framework for external noise as applied to rolling stock is becoming obsolete, it is necessary to update the technical requirements for the main types of electric trains and traction rolling stock. The article provides a brief overview of the conducted work to create a rolling stock external noise classifier.

Materials and methods. Field tests, which determined noise characteristics with noise pressure recording, were performed at train stand, as well as in motion at different speeds on tangent level track and in curves.

Results. The authors presented and analysed measurements data of the ES1P “Lastochka” electric multiple unit train at train stand and in motion. A database (signatures) of external noise and spectral characteristics of the studied rolling stock has been compiled, based on which a noise classifier of traction rolling stock and electric trains has been developed.

Discussion and conclusion. Analysis of the maximum external noise level of the ES1P “Lastochka” electric multiple unit train showed that the influence of rolling stock components on the level of its external noise affects speeds up to 80 km/h, while at higher speeds noise from the contact zones of wheels with rails predominates. The developed classifier would form the basis for further work aimed at localising the increased noise level of specific units.

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