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Journal of the Acoustical Society of America / Volume 131 / Issue 2 / JASA EXPRESS LETTERS

Optimization of orthotropic distributed-mode loudspeaker using attached masses and multi-exciters

J. Acoust. Soc. Am. Volume 131, Issue 2, pp. EL93-EL98 (2012); (6 pages)

Guochao Lu, Yong Shen, and Ziyun Liu

Key Laboratory of Modern Acoustics (Ministry of Education), Nanjing University, 22 Hankou Road, Gulou District, Nanjing 210193, People’s Republic of China lgcatnju@gmail.com, yshen@nju.edu.cn, ppa.ziyun.liu@gmail.com

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Based on the orthotropic model of the plate, the method to optimize the sound response of the distributed-mode loudspeaker (DML) using the attached masses and the multi-exciters has been investigated. The attached masses method will rebuild the modes distribution of the plate, based on which multi-exciter method will smooth the sound response. The results indicate that the method can be used to optimize the sound response of the DML.

© 2012 Acoustical Society of America

ACKNOWLEDGMENTS

Supported by the National Natural Science Foundation of China under Grant No. 10774075.

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KEYWORDS and PACS

Keywords

finite element analysis, frequency response, loudspeakers, plates (structures)

PACS

  • 43.38.Ja

    Loudspeakers and horns, practical sound sources

  • 43.38.Ar

    Transducing principles, materials, and structures: general

ARTICLE DATA

History
Received 21 Sep 2011
Accepted 30 Nov 2011
Published online 13 Jan 2012
Digital Object Identifier
http://dx.doi.org/10.1121/1.3672642

PUBLICATION DATA

ISSN

0001-4966 (print)  

Publisher

$abstract.society.value is a Member of CrossRef Acoustical Society of America

  1. Bai, M. R., and Liu, B. (2004). “Determination of optimal exciter deployment for panel speakers using the genetic algorithm,” J. Sound Vib. 269, 727–743JASMAN000126000005002294000001.
  2. Lu, G. C., and Shen, Y. (2009). “Model optimization of orthotropic distributed-mode loudspeaker using attached masses,” J. Acoust. Soc. Am. 126, 2294–2300.
  3. McMillan, A. J., and Keane, A. J. (1996). “Shifting resonances from a frequency band by applying concentrated masses to a thin rectangular plate,” J. Sound Vib. 192, 549–562. [Inspec] [ISI]
  4. McMillan, A. J., and Keane, A. J. (1997). “Vibration isolation in a thin rectangular plate using a large number of optimally positioned point masses,” J. Sound Vib. 202, 219–234. [Inspec] [ISI]
  5. Ratle, A., and Berry, A. (1998). “Use of genetic algorithms for the vibroacoustic optimization of a plate carrying point-masses,” J. Acoust. Soc. Am. 104, 3385–3397.
  6. Zhang, S. Z., Shen, Y., Shen, X. X., and Zhou, J. L. (2006) “Model optimization of distributed mode loud-speaker using attached masses,” J. Audio. Eng. Soc. 54, 295–305.

Figures (4) Tables (1)

Figures (click on thumbnails to view enlargements)

FIG.1
Coordinate system of the plate for the sound radiation simulation analysis.

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FIG.2
(a) The differences of the adjacent modes after optimized with various numbers attached masses. The area of the attached mass is 10.0mm×10.0mm, the area density is 50.0kg/m2. a: Two masses, b: three masses, and c: four masses. (b) The differences of the adjacent modes after optimized with various side lengths attached masses. The number of the attached masses is 3, the area density is 50.0kg/m2. a: Side length is 8.20 mm, b: side length is 10.0 mm, c: side length is 11.5 mm. (c) The differences of the adjacent modes after optimized with various area densities. The number of the attached masses is 3, the area is 10.0mm×10.0mm. a: Area density is 33.3kg/m2, b: area density is 50.0kg/m2, c: area density is 66.7kg/m2.

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FIG.3
The sound responses of the DML with and without the optimum masses (ψf = 0.893). The dotted lines are without masses, and the solid lines are with masses. (a) One exciter, (b) two exciters, (c) three exciters.

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FIG.4
The comparison of the optimum sound response with the original.

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Tables

Table I. Parameters of the DML and the exciter for calculation.

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