Estimation of Vibration Power Flow to and Sound Radiation from a Railway Concrete Viaduct Due to Vehicle/Track Interaction

摘要

The structure-born noise from a railway concrete viaduct due to vehicle passage is predicted via analysis of vehicle-track interaction, vibration power flow into and sound radiation from the structure. The dominant component of the structure-born noise from a concrete viaduct is below 100 Hz, which is associated with the vehicle's unsprung mass oscillating on the track stiffness, and irrelevant to train speed. Use of soft rail pad/fastener can effectively reduce the structure-born noise via reducing the dynamic force transmission to the viaduct, and thus, the vibration power flow. A reduction of 15 dB (A) in sound power radiated from a concrete viaduct can he achieved by replacing 60 MN/m pad with 6 MN/m rail fastener.