Railway ground borne noise (GBN) reduction by rail dampers

Wilson Ho, Max Yiu, Ron Wong, Ghazaleh Soltanieh, Yi Qing Ni

Research output: Chapter in book / Conference proceedingConference article published in proceeding or bookAcademic researchpeer-review

Abstract

Railway GBN impact has raised increasing concerns due to underground metro expansion. Reducing train speed or replacing standard baseplates with high resilient baseplates are sometimes adopted for GBN control. Both mitigations are not satisfactory considering the installation difficulty and limited performance, e.g. only ~3dB noise reduction for 30% train speed reduction. On the other hand, FST (Floating Slab Track) are commonly used. In many cases, to accommodate the FST, tunnel diameter is enlarged for the TBM (Tunnel Boring Machine) tunnel section. Also, rail dampers are used for air-borne noise control, but never used for GBN control due to its relatively small mass. P2 resonance is a main cause of railway GBN. It is a simple harmonic motion of a lump mass (wheel and rail combined) oscillating on top of resilient baseplates. Laboratory test with a 6m fastened rail and a ~450kg weight to simulate train wheel and track system. A retrofit rail damper with TMD (Tuned Mass Damping) oscillators is tested. The mass TMD oscillators along the rail with ~2m effective length of P2 resonance is more than 10% of the wheel mass. Around 7dB vibration reduction is recorded at the rail and floor when allowing the TMD oscillation.

Original languageEnglish
Title of host publicationInternoise 2022 - 51st International Congress and Exposition on Noise Control Engineering
PublisherThe Institute of Noise Control Engineering of the USA, Inc.
ISBN (Electronic)9781906913427
Publication statusPublished - Aug 2022
Event51st International Congress and Exposition on Noise Control Engineering, Internoise 2022 - Glasgow, United Kingdom
Duration: 21 Aug 202224 Aug 2022

Publication series

NameInternoise 2022 - 51st International Congress and Exposition on Noise Control Engineering

Conference

Conference51st International Congress and Exposition on Noise Control Engineering, Internoise 2022
Country/TerritoryUnited Kingdom
CityGlasgow
Period21/08/2224/08/22

ASJC Scopus subject areas

  • Acoustics and Ultrasonics

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