James T. Gillis
E. T. Falangas
The Aerospace Corp., 2350 E. El Segundo Blvd., El Segundo, CA 90245-4691
A new technique for controlling noise transmission into a cavity using piezoelectric actuators on an elastic plate is discussed. This study involves construction of a fully coupled acoustics/plate interaction model. This model is used to guide development of a new active noise control method. Implementation of this approach does not require adaptive signal processing such as the least-mean squares to minimize the acoustic energy in the cavity for control [Pan et al., J. Acoust. Soc. Am. 87, 2098--2108 (1990)]. It is similar in concept to plate velocity feedback control. However, the plate velocity feedback control is only effective for the plate controlled modes, whereas the new method is effective for both the plate and cavity controlled modes. A comparison of the simulations using velocity feedback and the least-mean-squares method with the new technique will be discussed.