Experimental studies of impulse noise produced by spheres moving through water
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Authors
Kunze, Thomas
Subjects
Moving sphere
Impulsive noise
Impulsive noise
Advisors
Sanders, J. V.
Sackman, George L.
Date of Issue
1980-03
Date
March 1980
Publisher
Monterey, California; Naval Postgraduate School
Language
en_US
Abstract
It is known from previous experiments that freely falling spheres produce sudden noise bursts. The source of this noise is unknown and little is known about the conditions under which it occurs, In an attempt to study this phenomenon under controlled conditions, spheres were towed in an anechoic tank. Velocities up to 5 m/sec and Reynolds numbers up to 4 x 10/5 were obtained with spheres of 2", 4" and 10" diameter. After eliminating all mechanical and acoustical disturbances, no noise bursts could be detected, However, the impulsive noise was still observed in free-fall experiments, and a ranging system allowed the location of these noise bursts with respect to a fixed point. A frequency analysis was done with a digital signal processor.
Type
Thesis
Description
Series/Report No
Department
Mechanical Engineering
Organization
Naval Postgraduate School
Identifiers
NPS Report Number
Sponsors
Funder
Format
Citation
Distribution Statement
Approved for public release; distribution is unlimited.
Rights
Copyright is reserved by the copyright owner.