Abstract
On the basis of nearfield acoustic holography (NAH) based on the equivalent source method (ESM), patch NAH based on the ESM is proposed. The method overcomes the shortcoming in the conventional NAH that the hologram surface should be larger than the source surface. It need not to discretize the whole source and its measurement need not to cover the whole source. The measurement may be performed over the region of interest, and the reconstruction can be done in the region directly. The method is flexible in applications, stable in computation, and very easy to implement. It has good potential applications in engineering. The numerical simulations show the invalidity of the conventional NAH based on the ESM and prove the validities of the proposed method for reconstructing a partial source and the regularization for reducing the error effect of the pressure measured on the hologram surface.
Similar content being viewed by others
References
Williams E G, Maynard J D, Skudrzyk E. Sound source reconstruction using a microphone array. J Acoust Soc Am, 1980, 68(1): 340–344
Veronesi W A, Maynard J D. Digital holographic reconstruction of source with arbitrarily shaped surfaces. J Acoust Soc Am, 1989, 85: 588–598
Wang Z, Wu S F. Helmholtz Equation-Least Squares Method for Reconstructing the Acoustic Pressure Field. J Acoust Soc Am, 1997, 102(4): 2020–2032
Williams E G. Continuation of acoustic near-fields. J Acoust Soc Am, 2003, 113(3): 1273–1281.
Williams E G, Houston B H. Fast Fourier transform and singular value decomposition formulations for patch nearfield acoustical holography. J Acoust Soc Am, 2003, 114(3): 1322–1333
Maynad J D, Williams E G, Lee Y. Nearfield acoustic holography I: Theory of generalized holography and development of NAH. J Acoust Soc Am, 1985, 78(4): 1395–1413
Bai M R. Application of BEM (boundary element method)-based acoustic holography to radiation analysis of sound sources with arbitrarily shaped geometries. J Acoust Soc Am, 1992, 92: 533–549
Kim B K, Ih J G. On the reconstruction of the vibro-acoustic field over the surface enclosing an interior space using the boundary element method. J Acoust Soc Am, 1996, 100(5): 3003–3016
Hald J. Patch near-field acoustical holography using a new statistically optimal method. Proc. INTER-NOISE 2003, 2003. 2203–2210
Saijyou K, Uchida H. Data extrapolation method for boundary element method-based near-field acoustical holography. J Acoust Soc Am, 2004, 115(2): 785–796
Lee M Y, Bolton J S. Patch near-field acoustical holography in cylindrical geometry. J Acoust Soc Am, 2005, 118(6): 3721–3732
Saijyou K, Yoshikawa S. Reduction methods of the reconstruction error for large-scale implementation of near-field acoustical holography. J Acoust Soc Am, 2001, 110(4): 2007–2023
Angie Sarkissian. Extension of measurement surface in near-field acoustic holography. J Acoust Soc Am, 2004, 115(4): 1593–1596
Angie Sarkissian. Method of superposition applied to patch near-field acoustic holography. J Acoust Soc Am, 2005, 118(2): 671–678
Koopmann G H, Song L, Fahnline J. A method for computing acoustic fields based on the principle of wave superposition. J Acoust Soc Am, 1989 86(5): 2433–2438
Song L, Koopmann G H, Fahnline J. Numerical errors associated with the method of superposition for computing acoustic fields. J Acoust Soc Am, 1991, 89(6): 2625–2633
Bi C X, Chen X Z, Zhou R, et al. Nearfield acoustic holography based on the equivalent source method. Sci China Ser E-Tech Sci, 2005, 48(3): 338–353
Williams E G. Regularization methods for near-field acoustical holography. J Acoust Soc Am, 2001, 110(4): 1976–1988
Williams E G, Houston B H. Interior near-field acoustical holography in flight. J Acoust Soc Am, 2000, 108(4): 1451–1463
Landweber L. An iteration formula for Fredholm integral equations of the first kind. Am J Math, 1951, 73: 615–624
Tikhonov A N. Solution of incorrectly formulated problems and the regularization method. Soviet Math Dokl, 1963, 4: 1035–1038
Morozov V A. On regularization of Ill-posed problems and selection of regularization parameter. J Comp Math Phys, 1966, 6(1): 170–175
Hansen P C. Analysis of discrete ill-posed problems by means of the L-curve. SIAM Rev, 1992, 34: 561–580
Golub G H, Heath M, Wahba G. Generalized cross-validation as a method for choosing a good ridge parameter. Technometrics, 1979, 21: 215–223
Author information
Authors and Affiliations
Corresponding author
Additional information
Supported by the National Natural Science Foundation of China (Grant Nos. 10504006 and 50675056) and the Research Fund for the Doctoral Program of Higher Education (Grant No. 20060359003)
Rights and permissions
About this article
Cite this article
Bi, C., Chen, X., Xu, L. et al. Patch nearfield acoustic holography based on the equivalent source method. Sci. China Ser. E-Technol. Sci. 51, 100–110 (2008). https://doi.org/10.1007/s11431-008-0001-4
Received:
Accepted:
Issue Date:
DOI: https://doi.org/10.1007/s11431-008-0001-4