Abstract
The response of a ribbed cylinder to impulsive excitation was measured on a cylindrical scan surface in the evanescent near field of a cylinder and previously reported [J. A. Clark, and D. Feit, L Acoust. Soc. Am. Suppl. 1 84, S87 (1986)]. The present paper describes the application of a modified maximum‐likelihood array processing algorithm to the spatial array data in conjunction with short time FFT processing of selected temporal portions of the transient response, to provide high resolution wave‐number‐frequency‐time information about the field. Slowness (reciprocal phase velocity) versus time plots of the response for each frequency band reveal the time of arrival and the phase velocity of the various waves traveling past the array, which are compared to theoretically predicted dispersion curves for a water loaded infinite cylindrical shell. [Work supported by DARPA/ONR.]
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