Vibration and noise damping technique for large bus body

Boundary element method was used to study the sound field of car room and the sound contribution of body segments. The frequency which the peak of sound pressure in the car corresponds and the body segment to which the noise sources of the peak component correspond were analysed. To reduce the vibration and noise of the bus body and in view of the lightweight body design, optimal parameters of the composite damping structure under corresponding constraints were investigated, considering the sound radiation, modal frequencies and loss factor characteristics of the composite damping structure model. Good results on the bus body were achieved by using the damping technique proposed.