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This content will become publicly available on May 19, 2018

Title: An experimental comparison of various methods of nearfield acoustic holography

An experimental comparison of four different methods of nearfield acoustic holography (NAH) is presented in this study for planar acoustic sources. The four NAH methods considered in this study are based on: (1) spatial Fourier transform, (2) equivalent sources model, (3) boundary element methods and (4) statistically optimized NAH. Two dimensional measurements were obtained at different distances in front of a tonal sound source and the NAH methods were used to reconstruct the sound field at the source surface. Reconstructed particle velocity and acoustic pressure fields presented in this study showed that the equivalent sources model based algorithm along with Tikhonov regularization provided the best localization of the sources. Reconstruction errors were found to be smaller for the equivalent sources model based algorithm and the statistically optimized NAH algorithm. Effect of hologram distance on the performance of various algorithms is discussed in detail. The study also compares the computational time required by each algorithm to complete the comparison. Four different regularization parameter choice methods were compared. The L-curve method provided more accurate reconstructions than the generalized cross validation and the Morozov discrepancy principle. Finally, the performance of fixed parameter regularization was comparable to that of the L-curve method.
Authors:
 [1] ;  [2] ;  [1]
  1. Argonne National Lab. (ANL), Lemont, IL (United States)
  2. Illinois Institute of Technology, Chicago, IL (United States); California State Univ., Long Beach, CA (United States)
Publication Date:
Grant/Contract Number:
AC02-06CH11357; DOE-AC02-06CH11357
Type:
Accepted Manuscript
Journal Name:
Journal of Sound and Vibration
Additional Journal Information:
Journal Volume: 403; Journal Issue: C; Journal ID: ISSN 0022-460X
Publisher:
Elsevier
Research Org:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Building Technologies Office (EE-5B)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; GCV; L-curve; Morozov; nearfield acoustic holography; SONAH; Tikhonov; boundary element methods; equivalent sources model
OSTI Identifier:
1366517
Alternate Identifier(s):
OSTI ID: 1419526