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Numerical simulation of parametric sound generation and its application to length-limited sound beam
Blekinge Institute of Technology, School of Engineering, Department of Mathematics and Natural Sciences.
2012 (English)In: Applied Acoustics, ISSN 0003-682X, Vol. 73, no 12, 1231-1238 p.Article in journal (Refereed) Published
Abstract [en]

In this study we propose a simulation model for predicting the nonlinear sound propagation of ultrasound beams over a distance of a few hundred wavelengths, and we estimate the beam profile of a parametric array. Using the finite-difference time-domain method based on the Yee algorithm with operator splitting, axisymmetric nonlinear propagation was simulated on the basis of equations for a compressible viscous fluid. The simulation of harmonic generation agreed with the solutions of the Khokhlov-Zabolotskaya-Kuznetsov equation around the sound axis except near the sound source. As an application of the model, we estimated the profiles of length-limited parametric sound beams, which are generated by a pair of parametric sound sources with controlled amplitudes and phases. The simulation indicated a sound beam with a narrow truncated array length and a width of about one-quarter to half that of regular a parametric beam. This result confirms that the control of sound source conditions changes the shape of a parametric beam and can be used to form a torch like low-frequency sound beam.

Place, publisher, year, edition, pages
Elsevier , 2012. Vol. 73, no 12, 1231-1238 p.
Keyword [en]
Nonlinear sound propagation, Parametric acoustic array, Length-limited sound beam, Numerical simulation, Finite-difference time-domain (FDTD) method
National Category
Fluid Mechanics and Acoustics
URN: urn:nbn:se:bth-7151DOI: 10.1016/j.apacoust.2012.02.016ISI: 000308730300004Local ID: diva2:834733
Special IssueAvailable from: 2012-11-28 Created: 2012-11-28 Last updated: 2015-06-30Bibliographically approved

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Hedberg, Claes
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