Sound radiation from the waveguide double plate regarding air cavity between the upper and lower plates

ABSTRACT In this study, the vibration and sound radiation from the double-layered strip plate with air cavity between the upper and lower plates are investigated by using the waveguide finite and boundary element method. The interaction between the structural and acoustic waves propagating along the double-layered strip plate is investigated by observing the dispersion relations of the waves. The vibration and sound radiation from the double-layered strip plate with and without the air cavity are compared. From this study, the interaction between the structural and acoustic waves appear in the dispersion curves due to the air cavity. The large variations of the vibration and radiated power between the unstiffened and stiffened double plates are observed due to the air cavity. As the stiffeners are added, however, its contribution becomes less.