Survey of free-field methods to measure the normal specific acoustic impedance of ground surfaces in situ at low frequencies
Borth, Jeffrey D.
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https://hdl.handle.net/2142/42263
Description
Title
Survey of free-field methods to measure the normal specific acoustic impedance of ground surfaces in situ at low frequencies
Author(s)
Borth, Jeffrey D.
Issue Date
2013-02-03T19:29:38Z
Director of Research (if dissertation) or Advisor (if thesis)
Swenson, George W.
Department of Study
Electrical & Computer Eng
Discipline
Electrical & Computer Engr
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
M.S.
Degree Level
Thesis
Keyword(s)
acoustic impedance
low frequency acoustic impedance
ground impedance
Abstract
Several techniques for measuring the normal specific acoustic impedance of the ground in situ and at low frequencies are examined. These techniques include the use of a spherical wave model, plane wave model, boundary conditions method, and the ANSI S1.18-2010 standard. Experiments are performed with both normal and oblique incidence configurations. A new short-time Fourier transform technique is applied to the measured pressure data to reduce the variance of estimates. Credible estimates of the ground impedance are shown for frequencies as low as 30 Hz. Suggestions are made for future experiments.
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