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Paper Abstract and Keywords
Presentation 2011-10-28 13:00
Prediction Method of Vibration Mode on Surface of Sound Source in Very Near-Field for Noise Reduction with Acoustic Tubes
Kota Ishikawa, Kenji Furihata (Shinshu Univ.) EA2011-68
Abstract (in Japanese) (See Japanese page) 
(in English) A silencer (30dB of attenuation) with a soft acoustic feature of the open end of an acoustic tube which has good reduction performance at low frequencies of noise source has been studied. In addition, since it is unrealizable with a general material, the soft surface is realized by approximation using quarter-wavelength sound tubes. In the previous paper [1] using quarter-wavelength sound tubes for noise control has been carried out until now. For the acoustic intensity measurement to clear the mechanism of attenuation, an intensity probe microphone system to measure on surface of sound source in very near-field (5mm) has been developed. The measurement accuracy of near field acoustic holography and dual microphone intensity measurement techniques are examined in terms of source identification capabilities and sound intensity level estimates. The sound pressure maps measured by the probe correlated extremely well with the near field (5mm) acoustic holography projections. Data was analyzed at from 315Hz to 2000Hz. Finally, the noise reduction mechanism with 21 acoustic tubes (diameter; 47mm, length; 130mm) were measured by the above acoustic intensity system. From the results, it can be said that the techniques can be applied according to their mounted method to best evaluate the test structure.
Keyword (in Japanese) (See Japanese page) 
(in English) Sound intensity / Acoustic Tube / Very Near-field / / / / /  
Reference Info. IEICE Tech. Rep., vol. 111, no. 270, EA2011-68, pp. 1-6, Oct. 2011.
Paper # EA2011-68 
Date of Issue 2011-10-21 (EA) 
ISSN Print edition: ISSN 0913-5685    Online edition: ISSN 2432-6380
Copyright
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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)
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Conference Information
Committee EA  
Conference Date 2011-10-28 - 2011-10-29 
Place (in Japanese) (See Japanese page) 
Place (in English) Faculty of Engineering, Shinshu Univ. 
Topics (in Japanese) (See Japanese page) 
Topics (in English) General Topics 
Paper Information
Registration To EA 
Conference Code 2011-10-EA 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Prediction Method of Vibration Mode on Surface of Sound Source in Very Near-Field for Noise Reduction with Acoustic Tubes 
Sub Title (in English)  
Keyword(1) Sound intensity  
Keyword(2) Acoustic Tube  
Keyword(3) Very Near-field  
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1st Author's Name Kota Ishikawa  
1st Author's Affiliation Shinshu University (Shinshu Univ.)
2nd Author's Name Kenji Furihata  
2nd Author's Affiliation Shinshu University (Shinshu Univ.)
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Speaker Author-1 
Date Time 2011-10-28 13:00:00 
Presentation Time 30 minutes 
Registration for EA 
Paper # EA2011-68 
Volume (vol) vol.111 
Number (no) no.270 
Page pp.1-6 
#Pages 6 
Date of Issue 2011-10-21 (EA) 

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