Active control of structurally radiated sound

In this paper, active control of radiating sound (using active structural acoustic control) from a vibrating rectangular plate by a steady-state harmonic point force disturbance is experimentally studied. Two piezoceramic actuators are bonded directly to the panel surface to provide control input structure. The sensor consists of two accelerometers mounted on the plate. Estimated radiated sound signals using a vibro-acoustic path transfer function are used as error signals. The vibro-acoustic path transfer function represents a system between accelerometers and microphones. The controller is a 2 by 2 filtered-x LMS algorithm implemented on a TMS320C30 DSP. The results demonstrate good control of sound radiation using the vibro-acoustic path transfer function.