ACOUSTIC DIFFRACTION FROM THE JUNCTION OF 2 FLAT PLATES

A general solution is developed for the acoustic and structural scatte red response from the junction of two flat plates under unilateral flu id loading. The plates are modelled by the classical theory of flexure , and the solution is found using the Wiener-Hopf technique for the du al integral equations for the unknown pressure on the plates. Explicit formulae are obtained for the pressure transform when the plates are in welded or clamped contact, and corresponding explicit expressions a re given for the various diffraction coefficients associated with the fluid-structure interaction. The magnitudes of the reflection and tran smission coefficients of structural waves display very simple analytic forms at low frequency.