Piezocomposite SmartPanels for active control of underwater vibration and noise

Piezocomposite SmartPanels, consisting of 1-3 actuators and pressure sensors and net-shape PZT accelerometers in a large area, low profile panel, have been fabricated and evaluated. Single layer and two-layer 100 x 100 mm and 250 x 250 mm SmartPanels have been tested for actuator authority, surface displacement uniformity, sensor-actuator coupling, and surface vibration reduction. Single layer SmartPanels have demonstrated a broad band 20 dB underwater surface vibration reduction. Current development activities include electronics integration for surface mounted SmartPanels and investigation of SmartPads in hybrid active-passive vibration isolation mounts. SmartPanels draw upon PZT injection molding technology, which is used to produce cost- effective and robust 1-3 piezocomposite materials. The piezocomposites are used extensively for SonoPanel transducers in a number of sensor and actuator applications. SonoPanels are qualified for US Navy applications, based on successful completion of pressure and shock tests, and are available in sizes up to 750 x 750 mm. Applications and performance for SmartPanels and SonoPanels are descried, including multi-element arrays, velocity sensors, and underwater vibration and noise reduction devices.