Numerical Analysis and Active Control Simulation of Sound Transmission from Air to Water through Plates

Abstract

Numerical analysis and active control simulation of sound transmission from air to water through laminated plates excited by a harmonic oblique incident plane wave and mounted in an infinite baffle are presented. The finite element method is used for modeling the dynamic behavior of the laminated plates integrated with piezoelectric layers and viscoelastic layer. The Rayleigh integral on the plate surface is coupled with the finite element formulation to obtain the required structural-acoustic quantities of the baffled plates. The numerical results show that the influence of the stiffness and mass of the plates on the sound transmission loss from air to water is not significant and indicate that damping control is an effective control strategy to increase the transmission loss at the resonance frequencies of the plates for sound transmission control from air to water. Active damping control and hybrid damping control are used to control the sound transmission from air to water through a plate. Numerical simulations show that both the active damping control and hybrid damping control can increase the transmission loss at the resonance frequency of the plate effectively, and especially the hybrid damping control is more favorable. The numerical results also show that the positions of peaks and dips on the transmission loss curve of a composite laminate are sensitive to the laminate layup pattern and the lamination angle of the fibers.