Browse > Article
http://dx.doi.org/10.7736/KSPE.2013.30.8.790

Investigation on Vibration Characteristics of Micro Speaker Diaphragms for Various Shape Designs  

Kim, Kyeong Min (Graduate School of NID Fusion Technology, Seoul National Univ. of Science and Technology)
Kim, Seong Keol (Dept. Mechanical System Design Engineering, Seoul National Univ. of Science and Technology)
Park, Keun (Dept. Mechanical System Design Engineering, Seoul National Univ. of Science and Technology)
Publication Information
Journal of the Korean Society for Precision Engineering / v.30, no.8, 2013 , pp. 790-796 More about this Journal
Abstract
Micro-speaker diaphragms play an important role in generating a desired audio response. The diaphragm is generally a circular membrane, and the cross section is a double dome, with an inner dome and an outer dome. To improve the sound quality of the speaker, a number of corrugations may be included in the outer dome region. In this study, the role of these corrugations is investigated using two kinds of finite element method (FEM) calculations. Structural FEM modeling was carried out to investigate the change in stiffness of the diaphragm when the corrugations were included. Modal FEM modeling was then carried out to compare the natural frequencies and the resulting vibrational modes of the plain and corrugated diaphragms. The effects of the corrugations on the vibration characteristics of the diaphragm are discussed.
Keywords
Micro Speaker; Diaphragm; Finite Element Analysis; Corrugation;
Citations & Related Records
Times Cited By KSCI : 3  (Citation Analysis)
연도 인용수 순위
1 Oh, S. J., "Fundamentals of loundspeaker engineering," Seokhak-Dang, 2006.
2 Hwang, G. Y., Kim, K. T., Chung, S. U., Hwang S. M., and Kang, B. S., "Analysis of a dynamic speaker in mobile phones by considering mechanical, electrical, and magnetic coupling effects," J. Appl. Phys., Vol. 91, No. 10, pp. 6979-6981, 2002.   DOI   ScienceOn
3 Kwon, J. H., Kim, K. S., Bang, K. C., and Hwang S. M., "Analysis of total harmonic distortion in microspeaker considering coupling effect," Trans. Kor. Soc. Noise and Vib. Eng., Vol. 18, No. 4, pp. 473-479, 2008.   과학기술학회마을   DOI   ScienceOn
4 Hwang, S. M., Lee, H. J., Hong, K. S., Kang, B. S., and Hwang, G. Y., "New development of combined permanent-magnet type microspeakers used for cellular phones," IEEE Trans. on Magn., Vol. 41, No. 5, pp. 2000-2003, 2005.   DOI   ScienceOn
5 Jung, K. I., Yi, H. R., Oh, S. J., and Yoon, S. W., "Behaviour of micro-loudspeaker diaphragms," J. Acc. Soc. Kor., Vol. 23, No. 2, pp. 499-502, 2004.
6 Kim, S. K., Lee, T. H., and Lee, S. S., "Multidisciplinary design optimization for acoustic characteristics of a speaker diaphragm," Proc. 2004 Fall Conf. Kor. Soc. Noise Vib. Eng., Vol. 4, pp. 763- 766, 2004.
7 Kim, W. C., Jang, G. W., and Kim, Y. Y., "Microspeaker diaphragm optimization for widening the operating frequency band and increasing sound pressure level," IEEE Trans. on Magn., Vol. 46, No. 1, pp. 59-66, 2010.   DOI   ScienceOn
8 Yamaguchi, T., Saito, T., Nagai, K., Maruyama, S., Kurosawa, Y., and Matsumura, S., "Analysis of damped vibration for a viscoelastic block supported by a nonlinear concentrated spring using FEM," J. System Design Dynamics, Vol. 4, No. 1, pp. 154-165, 2011.
9 Nam, G. J., Lee, C. B., and Kim, C. D., "A study on the small size loudspeaker for Hi-Fi low frequency sound reproduction," Trans. Kor. Soc. Noise and Vib. Eng., Vol. 20, No. 8, pp. 31-37, 2001.   과학기술학회마을
10 Hwang, S. M., Hwang, G. Y., Kwon, J. H., Lee, H. J., and Kang, B. S., "Performance comparison between circular and elliptical type microspeakers for cellular phones," IEEE Trans. on Magn., Vol. 39, No. 5, pp. 3256-3258, 2003.   DOI   ScienceOn
11 Lee, C. M., Kwon, J. H., Kim, K. S., Park, J. H., and Hwang, S. M., "Design and analysis of microspeakers to improve sound characteristics in a low frequency range," IEEE Trans. on Magn., Vol. 46, No. 6, pp. 2048-2051, 2010.   DOI   ScienceOn
12 Lee, T. K., Kim, B. S., and Cho, T. J., "A study on the acoustical properties of micro-speaker according to comb teeth shape of the diaphragm," Trans. Kor. Soc. Mach. Tool Eng., Vol. 17, No. 6, pp. 124-131, 2008.   과학기술학회마을
13 ANSYS Inc, "ANSYS Multiphysics Release 12.0 User's Manual," 2009.
14 Seo, Y. S. and Park, K., "Finite element analysis of an ultrasonic tool horn for pattern forming," J. Kor. Soc. Precis. Eng., Vol. 28, No. 3, pp. 363-369, 2011.   과학기술학회마을
15 Kim, K. M. and Park, K., "Vibration characteristics of micro-speaker diaphragm considering thermoforming effect," Proc. 5th Int. Conf. Manuf. Mach. Design Tribology, Page No. 166, 2013.