Anisotropic effects of polyvinylidene fluoride on the control of transmitted sound fields through a composite plate

This paper presents numerical simulations on the control of sound transmission through a composite plate. The composite plate mounted in an infinite baffle is excited by the incident plane wave. The anisotropic PVDF (polyvinylidene fluoride) films bonded on the surface of the plate are used as distributed actuators for the reduction of sound transmission. The vibration of composite the plate and the sound transmission through the plate are analysed by using the coupled finite element and boundary element method. A constrained minimization problem was solved to obtain input voltages of the piezoelectric actuators, so that the transmitted sound can be reduced. To investigate the effects of anisotropic PVDF, several distributed PVDF actuators are tested in a control simulation. The results show that the control effectiveness of distributed PVDF actuators can be enhanced by utilizing the distributed shape and the directional characteristics of PVDF. Then the design of a PVDF actuator that is efficient for the control of sound transmission is performed by optimizing the shape and the ply angle of PVDF. It is shown that the reduction of sound transmission through the plate is successfully achieved, if the distributed shape and the ply angle of the PVDF actuator are properly selected.

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