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The acoustic monopole in motionThe results of an experiment are presented in which a small monochromatic source which behaves like an acoustic monopole when stationary is moved at a constant speed over an asphalt surface past stationary microphones. An analysis of the monopole moving above a finite impedance reflecting plane is given. The theoretical and experimental results are compared for different ground to observer heights, source frequencies, and source velocities. A computation of the effects of source acceleration on the noise radiated by the monopole is also presented.
Document ID
19770004873
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Norum, T. D. (NASA Langley Research Center Hampton, VA, United States)
Liu, C. H. (NASA Langley Research Center Hampton, VA, United States)
Date Acquired
September 3, 2013
Publication Date
November 1, 1976
Subject Category
Acoustics
Report/Patent Number
NASA-TM-X-73985
Report Number: NASA-TM-X-73985
Meeting Information
Meeting: ASA Meeting
Location: San Diego
Start Date: November 16, 1976
End Date: November 19, 1976
Accession Number
77N11816
Funding Number(s)
PROJECT: RTOP 505-03-11-02
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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