Active control of sound transmission through a double wall partition into an acoustic cavity

12th International Congress on Sound and Vibration 2005, ICSV 2005, Lisbon, 11-14 July 2005Active control of sound transmission through a mechanically-linked double-wall structure into an acoustic cavity is investigated in this paper. Based on a fully coupled vibro-acoustic model, two different control strategies are studied: a), cavity control using acoustic sources inside the air gap and b). structural control using structural actuators between the two panels. The relationship between the transmission path (acoustic or structural) and the selection of control strategies is explored. For each case, the dominant control mechanism at different frequency ranges is examined. It is found that modal suppression is dominant at low frequencies while modal reconstructing at high frequencies. In addition, the effect of the acoustic mode (0,0,0) on active control of energy transmission is also discussed, giving guidance to choose the appropriate control arrangement to ensure a maximum control performance.Department of Mechanical EngineeringRefereed conference pape