Wave Component Analysis of Fluid{loaded, Finite Cylindrical Shell Response

In this paper, the surface displacement response of a-nite uid{loaded shell and the resulting far eld acoustic pressure are studied. A high resolution signal processing algorithm is applied to the surface displacement to estimate the constituent wave numbers and corresponding amplitudes for these wave components. This parameter estimation technique identiies the uid{loaded cylinder's complex dispersion relations from nite shell data; the dispersion relations consist of subsonic, leaky, evanescent and oscillatory{decaying wave{number loci. The identiied results are compared to the analytic dispersion relations. The far eld pressure radiated due to each wave{number component is computed allowing for the determination of important contributors to the far eld response. For the frequencies studied, the subsonic wave dominates the far eld response due to the nite length of the shell and large amplitude of this component. The supersonic components have the next largest contribution to the far eld pressure.