Structural Modal Control for Reducing Sound Radiation

Abstract

Frequency response of the modal sound transmission coefficient is explained by taking into account the generalized force induced by the incident acoustic wave, the radiation efficiency, and the natural frequency of the structural mode. Since the interaction among the structural modes is not considered in the three parameters, the behavior of the modal sound transmission coefficient can be partially explained by these parameters. The modal sound transmission coefficient is thought to be high if the amplitude of the generalized force and the radiation efficiency are high and the natural frequency is close to the frequency of interest. The numerical example showed that it is true.