Arctic Acoustics Ultrasonic Modeling Studies

A unique collection of laboratory ultrasonic modeling results are presented revealing and characterizing hidden pulsed seismoacoustic wave phenomena from 3-D range dependent liquid/solid boundaries. The research succeeded in isolating and identifying low-frequency (10-500 Hz) transmission loss mecha...

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Bibliographic Details
Main Author: Chamuel, Jacques R.
Other Authors: SONOQUEST ADVANCED ULTRASONICS RESEARCH WELLESLEY HILLS MA
Format: Text
Language:English
Published: 1990
Subjects:
Acoustics
*ULTRASONICS
*ACOUSTIC WAVES
THICKNESS
MODELS
INTERFACES
WATER
EDGES
NUMERICAL ANALYSIS
BACKSCATTERING
SOLIDS
ICE
PLATES
LABORATORIES
WEDGES
UNDERWATER ACOUSTICS
DETERMINATION
BOTTOM
FLEXURAL PROPERTIES
LOW FREQUENCY
WAVES
TRANSMISSION LOSS
SEA ICE
ARCTIC REGIONS
RAYLEIGH WAVES
FLOATING BODIES
TRAILING EDGES
TRANSMISSIONS(MECHANICAL)
COUPLING(INTERACTION)
ANGLES
PE61153N
Arctic
Sea ice
Online Access:http://www.dtic.mil/docs/citations/ADA224165
http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA224165
Description
Summary:A unique collection of laboratory ultrasonic modeling results are presented revealing and characterizing hidden pulsed seismoacoustic wave phenomena from 3-D range dependent liquid/solid boundaries. The research succeeded in isolating and identifying low-frequency (10-500 Hz) transmission loss mechanisms and provided physical insight into Arctic acoustic problems generally beyond the state-of-the-art of theoretical and numerical analysis. The ultrasonic modeling studies dealt with controversial issues and existing discrepancies on seismo-acoustic waves at water/ice interface, sea-ice thickness determination, low-frequency transmission loss, and bottom leaky Rayleigh waves. The areas investigated include leaky Rayleigh waves at water/ice interface, leaky flexural waves in floating ice plates, effects of dry/wet cracks in sea- ice on plate waves and near-grazing acoustic waves, edge waves in floating plates, low-frequency backscatter from ice keel-width resonances, conversion of underwater acoustic waves into plate waves by keels, nondispersive flexural wave along apex of small-angle solid wedge, Scholte and leaky Rayleigh waves along apex of immersed 90 ice wedge, backscatter from trailing edge of floes, floating plate resonances associated with near-grazing underwater acoustic waves, acoustic coupling between adjacent floes, and multiple bottom leaky Rayleigh wave components in water layer over solid bottom.

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