On the design of an acoustically isolating bubble screen for the Carr Inlet Acoustic Range.
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Authors
Marr, Kenneth William
Subjects
acoustic isolation
acoustic reflection
bubble screen
acoustic reflection
bubble screen
Advisors
Sanders, James V.
Date of Issue
1981-06
Date
June 1981
Publisher
Language
en_US
Abstract
The theoretical acoustic behavior of an underwater bubble
screen was examined using Rayleigh reflection theory. A
microcomputer model simulates the acoustic impedance mismatch
at the interfaces of an ideal, bubble screen. A sensitivity
analysis indicates that the angle of incidence of sound
energy and the speed of sound in the layer are the most
important screen properties for predicting the insulating
capability of a bubble screen. In the neighborhood of
frequencies for which the screen thickness is an integral
number of half wavelengths, the interference results in a
reduced reflection coefficient and a corresponding increase
in transmission through the screen. So that for a broad
band spectrum wide enough to cover a number of such
frequencies, the attenuation to be expected exceeds 10 dB
only over about 90 percent of the spectrum. The interest
for this work came from the need for a noise insulating
screen at the Carr Inlet Acoustic Range.
Type
Thesis
Description
Series/Report No
Department
Physics and Chemistry
Organization
Naval Postgraduate School (U.S.)
Identifiers
NPS Report Number
Sponsors
Funder
Format
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.