Prediction of a body's structural impedance and scattering properties using correlation of random noise

Abstract : This paper derives a method to estimate the structural or surface impedance matrix (or equivalently the inverse of the structural Green's function) for an elastic body by placing it in an encompassing and spatially random noise field and cross-correlating pressure and normal velocity measurements taken on its surface. A numerical experiment is presented that utilizes a cross-correlation method to determine the structural impedance matrix for an infinite cylindrical shell excited by a spatially random noise field. It is shown that the correlation method produces the exact analytic form of the structural impedance matrix. Furthermore, using standard impedance formulations of the scattered and incident pressure fields at the object surface that are based on the equivalent source method and using this estimated structural impedance, a prediction of the scattered acoustic field at any position outside of the object can be made for any given incident field. An example is presented for a point (line) source near a cylindrical shell and when compared with the analytical result, excellent agreement is found between the scattered fields at a radius close to the shell.
Document type :
Journal articles
Complete list of metadatas

Cited literature [30 references]  Display  Hide  Download

https://hal.archives-ouvertes.fr/hal-01128144
Contributor : Sandrine Rakotonarivo <>
Submitted on : Tuesday, March 29, 2016 - 5:12:58 PM
Last modification on : Wednesday, August 7, 2019 - 12:18:06 PM
Long-term archiving on : Thursday, November 10, 2016 - 5:04:17 PM

File

JASA_FinalVersion.pdf
Publisher files allowed on an open archive

Licence


Copyright

Identifiers

Citation

Sandrine Rakotonarivo, W. A. Kuperman, Earl G. Williams. Prediction of a body's structural impedance and scattering properties using correlation of random noise. Journal of the Acoustical Society of America, Acoustical Society of America, 2013, 134, pp.4401-4411. ⟨10.1121/1.4828833]⟩. ⟨hal-01128144⟩

Share

Metrics

Record views

164

Files downloads

146