Interaction of a sound pulse with an elastic shell submerged in the sea

Author

Gaunaurd, G.C. ; Strifors, H.C.

Author_Institution

US Naval Surface Warfare Center, Silver Spring, MD, USA

fYear

1991

fDate

8-11 Dec 1991

Firstpage

969

Abstract

The transient interaction of an acoustic pulse with an elastic, air-filled, spherical shell submerged in water is described. The interaction is described analytically, and it is evaluated numerically. Short (or long) pulses have a broad (or narrow) spectrum that will excite numerous (or a single one) shell resonances within its spectral band. A study of the backscattered returns is presented and it is shown how a suitable choice of ω₀, the carrier frequency, and of the incident pulse-duration generate various types of echoes that one can predict, recognize, and use for target-ID purposes. If ω₀ coincides with any one of the shell´s resonances, the echoes take on informative shapes that are displayed and discussed

Keywords

echo; elasticity; sonar; underwater sound; air-filled spherical shell; backscattered returns; carrier frequency; echoes; elastic shell; hydroelasticity; impulse sonar; incident pulse-duration; seawater; shell resonances; sound pulse interaction; submerged in water; target identification; transient interaction; Acoustic pulses; Elasticity; Equations; Pulse shaping methods; Resonance; Sea surface; Shape; Silver; Springs; Steady-state;

fLanguage

English

Publisher

ieee

Conference_Titel

Ultrasonics Symposium, 1991. Proceedings., IEEE 1991

Conference_Location

Orlando, FL

Type

conf

DOI

10.1109/ULTSYM.1991.234259

Filename

234259