Critical frequencies for large-scale resonance signatures from elastic bodies

Michael F. Werby; Guillermo C. Gaunaurd

doi:10.1117/12.44862

1 August 1991 Critical frequencies for large-scale resonance signatures from elastic bodies

Michael F. Werby, Guillermo C. Gaunaurd

Proceedings Volume 1471, Automatic Object Recognition; (1991) https://doi.org/10.1117/12.44862
Event: Orlando '91, 1991, Orlando, FL, United States

Abstract

Acoustic signals scattered from submerged elastic targets have produced interesting back- scattered signals in the appropriate frequency region, particularly because of the presence of resonances. Considerable work has been done for spherically and cylindrically shaped objects out to moderate frequencies for both solids and shells. Only recently, however, have researchers been reporting on results for elongated objects such as spheroidal solids and shells. Further, the higher frequency region for spheres has not been investigated extensively. This paper reports on a series of calculations that the authors have been involved with that are characteristic of elongated targets or of spherical shells at the higher frequency region. Some of the results that are discussed involve bending resonances due to obliquely incident plane waves on elongated objects and their relation to flexural resonances of beams (classes of resonances that are related to waves creeping along the longest and shortest meridians of a spheroid) flexural resonances (A₀ resonances) for shells in the time domain at coincidence frequency, and high-frequency thickness effects when scattering from shells and their prediction based on flat plate theory. Several numerical examples are shown.

Citation Download Citation

Michael F. Werby and Guillermo C. Gaunaurd "Critical frequencies for large-scale resonance signatures from elastic bodies", Proc. SPIE 1471, Automatic Object Recognition, (1 August 1991); https://doi.org/10.1117/12.44862

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available