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Paper Abstract and Keywords
Presentation 2012-01-26 14:15
Numerical simulation of parametric sound array and visualization of difference frequency beam generation
Hideyuki Nomura, Tomoo Kamakura, Gregory T. Clement (UEC), Claes M. Hedberg (Blekinge Inst. of Tech.) US2011-91 EA2011-109
Abstract (in Japanese) (See Japanese page) 
(in English) In order to understand the process of parametric sound generation, it is useful to capture instantaneous sound fields of each component and to visualize the propagation process in a time domain, although sound fields are usually analyzed as stationary fields, for examples amplitude or effective value of pressure. In this study, we simulated the nonlinear propagations of ultrasounds in a time domain and extracted a parametric sound with the difference frequency from the nonlinearly interacted ultrasounds using a wave number filtering in order to visualize the propagation of the parametric sound. In particular, we focused on the generation of length-limited parametric sound beam, which indicates a truncated array length with narrower beam width compared to that of regular parametric sound beam. The simulations indicated that the propagation of length-limited parametric sound was concentrated around the beam axis with less spherical diffusion compared to regular parametric sounds. In aadition, the length-limited sound has discontinous wavefronts near the sound sources.
Keyword (in Japanese) (See Japanese page) 
(in English) Nonlinear sound propagation / Parametric acoustic array / Numerical Simulation / Length-limited parametric sound beam / Wave number filtering / / /  
Reference Info. IEICE Tech. Rep., vol. 111, no. 401, US2011-91, pp. 29-34, Jan. 2012.
Paper # US2011-91 
Date of Issue 2012-01-19 (US, EA) 
ISSN Print edition: ISSN 0913-5685    Online edition: ISSN 2432-6380
Copyright
and
reproduction		 All rights are reserved and no part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopy, recording, or any information storage and retrieval system, without permission in writing from the publisher. Notwithstanding, instructors are permitted to photocopy isolated articles for noncommercial classroom use without fee. (License No.: 10GA0019/12GB0052/13GB0056/17GB0034/18GB0034)
Download PDF US2011-91 EA2011-109

Conference Information
Committee EA US  
Conference Date 2012-01-26 - 2012-01-27 
Place (in Japanese) (See Japanese page) 
Place (in English) Kansai Univ. 
Topics (in Japanese) (See Japanese page) 
Topics (in English) [Joint Meeting on Acoustics and Ultrasonics Subsociety] Engineering/Electro Acoustics, Ultrasonic and Underwater Acoustics，and Related Topics 
Paper Information
Registration To US 
Conference Code 2012-01-EA-US 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Numerical simulation of parametric sound array and visualization of difference frequency beam generation 
Sub Title (in English)  
Keyword(1) Nonlinear sound propagation  
Keyword(2) Parametric acoustic array  
Keyword(3) Numerical Simulation  
Keyword(4) Length-limited parametric sound beam  
Keyword(5) Wave number filtering  
Keyword(6)  
Keyword(7)  
Keyword(8)  
1st Author's Name Hideyuki Nomura  
1st Author's Affiliation The University of Electro-Communications (UEC)
2nd Author's Name Tomoo Kamakura  
2nd Author's Affiliation The University of Electro-Communications (UEC)
3rd Author's Name Gregory T. Clement  
3rd Author's Affiliation The University of Electro-Communications (UEC)
4th Author's Name Claes M. Hedberg  
4th Author's Affiliation Blekinge Institute of Technology (Blekinge Inst. of Tech.)
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Speaker Author-1 
Date Time 2012-01-26 14:15:00 
Presentation Time 30 minutes 
Registration for US 
Paper # US2011-91, EA2011-109 
Volume (vol) vol.111 
Number (no) no.401(US), no.402(EA) 
Page pp.29-34(US), pp.31-36(EA) 
#Pages 6 
Date of Issue 2012-01-19 (US, EA) 

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