Active Noise Control Of Smart Structures Research

The paper describes an experimental research of controlling the interior noise of three-dimension enclosure. The research is achieved through a flexible panel. The enclosure has five rigid walls made from glass material and a flexible flat panel made up of aluminum material. The flexible panel is clamped. The noise produced by the outside speaker radiates into the enclosure through the vibration of the flexible panel. And via the piezoceramic (PZT-5H) actuator and piezoelectricity diaphragm(PVDF) sensor located on the flexible panel to realize the active control. Because the outside noise radiates into the enclosure through the vibration of the flexible panel, we can control the vibration of the flexible panel so as to control the interior noise. The vibration of the flexible panel is monitored by a piezoelectricity accelerate sensor, and through the comparision of the sensor' s power spectrums signals of before controlling and after controlling ,we can decide the controlling effect of the flexible panel.