Abstract
Acoustic diffraction from a line source by a semi-infinite plane in the presence of a moving fluid is studied. A finite region in the vicinity of the edge has a soft (pressure release) boundary condition; the remaining part of the semi-infinite plane is rigid. The effects of convection are included at low Mach numbers. The problem which is solved is a mathematical model for a rigid barrier with a soft edge. The far field is calculated using integral transforms, the Wiener-Hopf technique and asymptotic approximations. The physical interpretation of the result is then discussed.
