Reduction of the Radiated Sound Using the Acoustic Prediction Filter

Abstract

In this paper, reduction of the radiated sound from a vibrating rectangular plate is studied using the Acoustic Prediction Filter to estimate the radiated sound using the acceleration signals of the plate. A piezoceramic transducer (PZT) is used as an actuator to reduce the vibration and the radiated sound. To maximize the control performance, each PZT actuator is located at the position that has the largest control sensitivity of the plate bending moment in the direction of x and y coordinates and the optimal PZT location is validated experimentally. To find the acoustic prediction filter accurately, two accelerometers are located at the positions that have the largest radiation efficiencies of the plate, and the proposed locations are validated by simulation using the Rayleigh integral. The multi-channel filtered-x LMS algorithm is introduced to control a complex 2-D structural vibration mode. The control system using the acoustic prediction filter is presented and validated by experiments using a real time control system.