Sound attenuation pattern in a rectangular enclosure under potential-energy based active sound transmission control

The performance of the acoustic control system depends on the locations of control sources and error sensors. Under squared pressure control, maximized global and local performance of active noise control inside enclosure can be achieved by locating the error sensors at the peak quiet zone under potential energy control. Therefore, sound pressure attenuation pattern is critical for selection of error sensor locations in active control of sound inside an enclosure. For active control of sound transmission through a flexible structure, the effects of different edge rotational and translational flexibility of the flexible structure on the active sound transmission control have not been studied in detail. In present study, visualization of the sound pressure attenuation pattern under potential energy control shows the peak quiet zone located close to the flexible panel at low frequency and between the node lines at high frequency. The optimal location of error sensor close to a corner of the enclosure and the flexible structure is confirmed. The effects of rotational and translational flexibility of the edges of the flexible structure which form the transmission wall of the structure-acoustic system are discussed. Full coupling between the flexible structure and the enclosure is considered.