Assessment of sound pressure of transient noise radiated from vehicle-bridge coupling vibration

Low-frequency noise induced by vehicle-bridge coupling vibration is harmful to people's health and living environment.The investigation for the sound pressure level and the radiation mechanism of such kind of noise offers important accordance for assessment of environmental noise pollution and noise control.In this paper,the transient noise induced by vehicle-bridge coupling vibration is investigated by proposing a solving system based on FEM and BEM.A steel continuous bridge with three spans in service is studied as the case.The transient noise produced by vehicle-bridge coupling vibration is investigated by experiment and numerical simulation.Results show that the sound field properties in both time and frequency domains can be calculated by the proposed solving system,through which a more comprehensive assessment of sound pressure level and sound field distribution could be obtained.And the precision of the method is also validated.It is found that the sound pressure of the steel half-through girder bridge is great because the small stiffness and large sound radiation area of the steel plates.And the noise is induced mainly by the steel plates of the bridge.The traffic impacts while the vehicle traveling into and out of the bridge only affect the sound pressure in the neighborhood of the bridge abutment.The shape of contour lines in the area around the bridge deck looks like arcs.The sound pressures in the central area of the cross section of the bridge are greater than those in the two sides.