J. M. Cuschieri
Ctr. for Acoust. and Vib., Dept. of Ocean Eng., Florida Atlantic Univ., Boca Raton, FL 33431
D. Feit
David Taylor Res. Ctr., Bethesda, MD 20084
The solution for the response and radiated pressure from a fluid-loaded, infinite, cylindrical shell with a circumferential line load, is a classical problem in structural acoustics. Although this represents a rather fundamental problem, the solution for the Green's function typically involve a contour integration for each spatial point of interest. An alternative approach has been developed which solves for the Green's functions without the need to use a contour integral, for every spatial location, and without the need to introduce structural damping. The approach is a hybrid numerical/analytical solution, where the numerical part is based on an inverse discrete Fourier transform (IDFT) and the analytical part is the contribution of some of the poles in the solution which have to be removed to eliminate the singularities from the integrand of the IDFT. The singularities in the integrand are attributed to the real and near real poles of the fluid-loaded cylindrical shell response in the wave number domain. The location of the singularities is obtained using a numerical search algorithm and therefore the developed solution can be used to more complex geometries involving the fluid-loaded cylindrical shell. Results will be presented which match well with results found in the literature. [Work sponsored by ONR.]