Abstract
Active sound insulation control effect of a flexible thin plate using piezoelectric film, especially for the cases in which the plate were much more thinner than that reported in the conventional studies, was investigated theoretically and experimentally. At first, fundamental equations were summarized for a rectangular thin plate with rectangular-shaped piezoelectric film sensor and actuator. Then, vibration response of the plate and sensor output response of the piezoelectric film was derived based on the modal expansion method. Output frequency response of the system was estimated by the volume velocity, which was one of the suitable indexes when sound insulation effects were discussed. Finally, active sound insulation experiment of an acrylic plate of thickness around 0.3mm with a bonded PVDF film actuator was performed to verify the fundamental characteristics and performances of the proposed controlled structures.
