Abstract
Using the fact that anisotropy and shape of distributed piezopolymer actuator have coupling effects with vibration modes of structure, studies on the design of distributed piezopolymer actuator are performed in order to improve the effectiveness in active control of the sound transmission through composite structures. Sound fields from integrated structure are highly influenced by the vibration modes of structure. Therefore the shape and directional characteristics of PVDF actuator can be utilized in order to design an efficient actuator by considering the relationship between vibration modes of structure and control forces of anisotropic PVDF actuator. The vibration of composite plate and the sound transmission through the plate are analyzed by using the coupled finite element and boundary element method. Some numerical calculations are carried out on sound fields from elastic plates. To investigate the effectiveness of distributed piezopolymer actuator, various PVDF actuators are applied in control simulation. The results show that the control effectiveness of distributed PVDF actuator can be enhanced by utilizing the coupling between vibration modes and the anisotropy of PVDF. These facts indicate that the anisotropy and the shape of distributed piezopolymer suggest a promising mean for the design of more efficient actuators in controlling acoustic transmission from structure.
Published Version
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