EXPERIMENTAL STUDY OF ACOUSTIC RESONANCES ON ELASTIC SPHERES AND HEMISPHERICALLY ENDCAPPED CYLINDERS

Abstract- Acoustic resonance spectra were obtained experimentally for steel spheres and cylinders with hemispherical endcaps by acoustic backscattering (for cylinders: with both axial and oblique incidence). They were interpreted theoretically by surface wave propagation with phase matching over a closed path. The character of an elastic object immersed in water can be extracted form its acoustic scattering signal analytically /l / and experimentally /2-4/. In the present study, the echo amplitudes and acoustic resonance spectra for steel spheres and cylinders with hemispherical endcaps were obtained by numerical (gated Fourier) processing o £ experimental data fro