Experimental investigation of the effects of fluid loading on flexural waves in plates.
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Authors
Jarvis, James Laing
Subjects
Flexural Disk Transducer
Flexural Waves in Plates
Flexural Waves in Plates
Advisors
Wilson, O.B.
Date of Issue
1977
Date
December 1977
Publisher
Language
en_US
Abstract
An experimental investigation was conducted of the effects
of fluid loading on axially symmetric flexural waves in a
circular aluminum plate 25 in. in diameter and 5/16 in. thick.
Measurements were made of the flexural wavelength and natural
frequencies with the plate in air, and with water loading on
one side, over a frequency range from 20 kHz to 80 kHz. The
critical (coincidence) frequency, that frequency at which the
speed of the flexural wave equals the speed of sound in water,
occurs at approximately 4 5 kHz. The measured f lexural-wave
speeds with air loading are in good agreement with theory.
With water loading, the wave speed decreases, the amount of
decrease increasing to approximately 14 percent below the inair
value just below the critical frequency. At the critical
frequency, the wave speed appears to jump to values nearly
equal to the unloaded values. Radiation patterns were obtained
and when edge effects are eliminated, are in qualitative
agreement with theoretical predictions for an infinite
fluid-loaded plate.
Type
Thesis
Description
Series/Report No
Department
Physics and Chemistry
Organization
Identifiers
NPS Report Number
Sponsors
Funding
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Citation
Distribution Statement
Approved for public release; distribution is unlimited.
Rights
This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.