Sound radiation from a plate reinforced by two sets of parallel stiffeners

Abstract A solution is developed for the sound radiation from a point-excited infinite fluid-loaded plate which is reinforced by two sets of parallel stiffeners. The stiffeners are intended to represent the bulkheads and intermediate frames of a hull structure. The solution is found by using Fourier wavenumber transforms, and the stationary phase approximation is used to find an expression for the far field pressure. The effects of the two sets of stiffeners on the radiated pressure depend primarily on the number of frames between successive bulkheads and on the point of application of the force. The presence of frames and bulkheads away from the point of excitation becomes less important as the frequency of the excitation increases.