Sound contribution of the low frequency underwater noise radiated from a suspension bridge

For river crossing bridges, the vehicle-induced vibration can be transmitted to bridge tower and foundation system. This induced low frequency underwater noise radiation cause great harm aquatic organisms. A suspension was selected study sound contribution spatial distribution of noise. bridge-sediment coupling finite element model developed, vehicle-bridge-sediment interaction analysis conducted investigate dynamic response An acoustic built predict radiated from sediment, these two sources compared. The research shows that sediment is below 6.3 Hz, peak around 3.15 Hz. only has a larger total level in its vicinity than especially water surface. In other space, generated through plays dominant role lateral directivity, directivity similar point source.