Abstract
The sound scattering from a fluid-loaded stiffened cylindrical shell at normal incidence is studied by theoretical and experimental approaches. The cylindrical shell is reinforced by an internal longitudinal rigid plate attached to the shell along the axial direction. The backscattered sound is analyzed via the frequency-angle spectra. By studying the generation, propagation, and radiation of the waves, the authors found that the dominant features in the frequency-angle spectra can be explained by the resonance of the shell and the interaction between the scattered and radiation waves. The most significant effect of the internal plate is the radiation of the subsonic a0 waves caused by the attachments of the internal plate. Furthermore, simple formulas are given to predict the interference fringes in the frequency-angle spectra due to the interference between the specular reflection and the scattering from the shell structure response.
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