Active control of interior noise in an enclosure using piezoelectric actuator

In this paper, two issues about the interior noise active control are discussed with the enclosure. One issue is the modeling technique. Modal coupling method is used to establish the governing motion equations of the fully coupled acoustics-structure-piezoelectric patch system. This method can be applied to the vibro-acoustical system with any shaped enclosure by the modal parameters which appear in the frequency range of interest. The problem about the accuracy of frequency response which may be influenced by the number of modes employed in model coupling method is discussed and some comparison results are given. The second issue is the about active control mechanism. Control strategy is related to the optimal control of sound pressure level (SPL). The optimal control effect is greatly dependent on the number of piezo actuators and their locations. Optimization of the locations of piezo actuators with response surface methodology based on holographic neural network is proposed to search the global solution. Discussions on associated control mechanism show that both the mechanisms of modal amplitude suppression and modal rearrangement may sometimes coexist.