ACTIVE SOUND TRANSMISSION CONTROL FOR A WEAK PANEL-CAVITY COUPLED SYSTEM THROUGH A ELASTICALLY SUPPORTED FLEXIBLE BOUNDARY

摘要

Previous works have considered the classical boundary conditions of the flexible panel structures (i.e. simply supported and clamped edges) for the active sound transmission control. This study extends the analysis of active sound transmission control to the cases where the edges of the panel structure are elastically restrained in rotation and translation. The effectiveness of active sound transmission control for a weak panel-cavity system has been studied in a two-dimensional enclosure. The resultant attenuation of total acoustic potential energy under energy density control using pure vibration, pure acoustic and hybrid control sources are compared with those under other control schemes, namely potential energy and squared pressure controls. The performance of energy density control is similar to the theoretical solution of potential energy control. Pure vibration source with high edge translational flexibility of the panel structure is very effective for potential energy attenuation, but it adversely amplifies potential energy when the edge translational flexibility of the panel structure is low and at frequencies beyond the first cut-off frequency of the enclosure. While pure acoustic control source has a more uniform performance of potential energy attenuation with various edge flexibility compared with pure vibration control. Great improvement of performance can be observed using hybrid control sources.