Dynamic response and acoustic radiation of double-leaf metallic panel partition under sound excitation

The transmission of sound through a rectangular double-leaf metallic panel partition clamp mounted on a rigid acoustic baffle has been investigated analytically. It is found that, at a specific frequency, sound transmission through the structure is significantly enhanced for incident sound with a certain incidence angle. This physical phenomenon, namely, transparent effect, is analyzed in terms of both dynamical panel modal responses and radiating acoustic pressure. The enhanced transmission is attributed to the unique mass-air-mass effect of the double-panel partition system. Numerical results clearly demonstrate that this effect does not completely stem from the point-to-point out-of-plane motion of the two panels, due to the additional constraining effect of the clamped supports.