Acoustic diffraction from the junction of two flat plates

A general solution is developed for the acoustic and structural scattered response from the junction of two flat plates under unilateral fluid loading. The plates are modelled by the classical theory of flexure, and the solution is found using the Wiener-Hopf technique for the dual 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 are given for the various diffraction coefficients associated with the fluid-structure interaction. The magnitudes of the reflection and transmission coefficients of structural waves display very simple analytic forms at low frequency.