An Acoustic Ground Impedance Measurement

Report No. ARL-TN-221
Authors: John Williams
Date/Pages: July 2004; 22 pages
Abstract: A measurement of the acoustic ground impedance was made on soil composed of sand and clay covered by splotchy amounts of long grass. A sound pressure-volume velocity device was used to make the measurement. The real part of the ground impedance ranged from 46,662 Pa.s/m3 at 20Hz to 3,076 Pa.s/m3 at 260Hz. The magnitude of the imaginary part of the ground impedance ranged from 66,974 Pa.s/m3 at 20Hz to 4,005 Pa.s/m3 at 260Hz. These data are available to any interested researcher in the field of sound propagation.
Distribution: Approved for public release
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Last Update / Reviewed: July 1, 2004