Matthew Conti
Y. P. Guo
Ira Dyer
Dept. of Ocean Eng., MIT, Cambridge, MA 02139
Experimental studies of mid-frequency scattering from cylindrical shell
models at axial incidence have demonstrated the excitation of axisymmetric
compressional and flexural waves within the endcap. The endcap discussed here
consists of spherical and conical sections connected to the cylindrical portion
of the shell model via slope discontinuities. Phase-matched coupling to
compressional waves occurs on the spherical portion of the endcap. Scattering
to both wave types occurs at the slope discontinuities. Conical shell
dispersion equations developed by Guo are shown to match experimental
observations. The Wigner transform is used to demonstrate these phenomena.
Amplitude and group delay effects are discussed. The bistatic measurements were
conducted over a frequency range of 2.5