Design of a distributed acoustic actuator for active noise control
A distributed acoustic actuator for active noise control is designed and simulated. The distributed actuator consists of a piezoelectric PVDF film, which covers the entire surface of a passive carrier structure. The piezo elements are driven in anti-phase, resulting in a bending motion of the actuator. An analytical model for the acoustic actuator is derived, relating the actuator's displacement to the applied voltage, taking into account the influence of the piezoelectric film on the actuator's stiffness. The model is used to optimise the specifications for the piezoelectric film and the carrier structure, resulting in the highest sound power output a frequency range from 30-500 Hz. An analytical model for the behaviour of a double panel partition with a distributed acoustic actuator integrated in the cavity is derived. An active control system increases the sound power transmitted through the double panel partition. Simulation results show that a substantial increase in transmission loss can be achieved in a frequency region from 30 to 500 Hz with this configuration.
Bibliogr. 9 poz., wykr.