125 ACTIVE CONTROL OF SOUND TRANSMISSION WITH POINT ACTUATORS UTILIZING THE MECHANISM OF ANTI-RESONANCE PHENOMENON(O.S.3 Noise and Sound Control II)

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This paper describes active control of sound transmission loss of a thin planar structure using point actuators. In the work, an active control method is presented for the purpose of reducing the transmitted sound power using anti-resonance phenomenon, which is observed in sound transmission loss property of a small-size panel. From the standpoint of a numerical simulation, this method is found to be effective to reduce transmitted power in a low frequency range provided that a distributed modal actuator is utilized for control. In practice, however, it is hard to implement the distributed actuator because of its difficulty in design and handling. As such, this paper employs point actuators to control a particular mode of a target panel. Of the vibration modes in the frequency of interest, the (1,3) structural mode is targeted for control that can be excited by using 6 point actuators. First, an optimal feedforward control law for minimizing transmitted sound power is derived. Under the optimal control, normal-incidence sound transmission loss of a simply supported rectangular panel embedded in an infinite baffle is calculated. The experiment is then conducted, demonstrating the validity of the proposed method.
2005-05-31