Numerical simulation of parametric sound generation and its application to length-limited sound beam
| Document type: | Journal Articles |
|---|---|
| Article type: | Original article |
| Peer reviewed: | Yes |
| Author(s): | Hideyuki Nomura, Claes Hedberg, Tomoo Kamakura |
| Title: | Numerical simulation of parametric sound generation and its application to length-limited sound beam |
| Journal: | Applied Acoustics |
| Year: | 2012 |
| Volume: | 73 |
| Issue: | 12 |
| Pagination: | 1231-1238 |
| ISSN: | 0003-682X |
| Publisher: | Elsevier |
| URI/DOI: | 10.1016/j.apacoust.2012.02.016 |
| ISI number: | 000308730300004 |
| Organization: | Blekinge Institute of Technology |
| Department: | School of Engineering - Dept. of Mathematics & Natural Sciences (Sektionen för ingenjörsvetenskap - Avd.för matematik och naturvetenskap) School of Engineering S-371 79 Karlskrona +46 455 38 50 00 http://www.bth.se/ing/ |
| Language: | English |
| Abstract: | 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. |
| Subject: | Physical Acoustics\General |
| Keywords: | Nonlinear sound propagation, Parametric acoustic array, Length-limited sound beam, Numerical simulation, Finite-difference time-domain (FDTD) method |
| Note: | Special Issue |
