TY - GEN
T1 - Railway ground borne noise (GBN) reduction by rail dampers
AU - Ho, Wilson
AU - Yiu, Max
AU - Wong, Ron
AU - Soltanieh, Ghazaleh
AU - Ni, Yi Qing
N1 - Funding Information:
The funding support from the Innovation and Technology Commission of the Hong Kong Special Administrative Region to the Hong Kong Branch of National Rail Transit Electrification and Automation Engineering Technology Research Center (K-BBY1).
Publisher Copyright:
© 2022 Internoise 2022 - 51st International Congress and Exposition on Noise Control Engineering. All rights reserved.
PY - 2022/8
Y1 - 2022/8
N2 - 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.
AB - 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.
UR - https://www.scopus.com/pages/publications/85147446308
M3 - Conference article published in proceeding or book
AN - SCOPUS:85147446308
T3 - Internoise 2022 - 51st International Congress and Exposition on Noise Control Engineering
BT - Internoise 2022 - 51st International Congress and Exposition on Noise Control Engineering
PB - The Institute of Noise Control Engineering of the USA, Inc.
T2 - 51st International Congress and Exposition on Noise Control Engineering, Internoise 2022
Y2 - 21 August 2022 through 24 August 2022
ER -