Abstract
This paper describes a study of active noise isolation using an advanced composite board with embedded piezoelectric elements, which are used as both sensors and actuators. The identification system, which estimates the radiated sound from the voltage signals of the piezoelectric elements in the smart board, was constructed based on Rayleigh's integral formula so that no external microphone is needed for noise control. Since the control system was implemented to minimize the estimated value of noise by suppressing the vibration of the smart board, it can reduce the sound transmission through the board. The technique of self-sensing actuator was also used to reduce the number of piezoelectric need for the control. Experiments were performed and the results showed that the transmitted noise level was successfully reduced at several resonant peaks.
