Abstract
An analytical study of active control of sound transmission into a cabin enclosure is presented. A cabin enclosure with four acoustically rigid walls and two flexible plates is considered as the analytical model. Two types of actuators are used, i.e., acoustic actuators and distributed lead zirconate titanate piezoelectric (PZT) actuators instead of point force actuators. Using the modal acoustic transfer impedance‐mobility matrices, the excitation and interaction in the coupled sound transmission system can be described with clear physical significance. With the control system designed to globally reduce the sound field, different control configurations are considered, including the structural actuator on the incident panel, actuator on the receiving panel, acoustic actuator on the cavity, and their combinations. The effectiveness and performance of the control system corresponding to each configuration are compared and discussed. The roles and attenuation mechanisms of each type of actuator are of particular interest, and desirable placements of structural actuators in terms of total potential energy reduction are also discussed.
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