Abstract
This paper describes the active control systems for reducing coor impulse noise. The control sysmtem is comprised of actively controlled modular thin plates, which wholly cover the surface of concrete slab structure in the ceiling, and in each of which the mechanical vibration is controlled independently with bimorph type piezoelectric actuators. An active control system of modular plate is presented, where ave actuators and ave sensors are applied to control low frequency modes of bending vibration in the plate. The control system is now under development, where main subjects are, the active control system appropriate to the characteristics.
