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Proceedings Paper

Laser Doppler vibrometer measurement on spiders in moving-coil loudspeakers
Author(s): Xiaopeng Kong; Xinwu Zeng; Zhangfu Tian
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Paper Abstract

The spider is the dominate stiffness to suspend the cone for a moving-coil loudspeaker unit, and is most commonly a concentrically corrugated fabric disk. A subwoofer closed box is designed to excite the tested spiders pneumatically, and the Laser Doppler Vibrometer (LDV) is used to measure the velocity of the moving spiders. The effective stiffness, loss factor and some viscoelastic behaviors such as level dependent stiffness have been investigated. The results find that, this pneumatic non-contact dynamic technique successfully measured the viscoelastic behaviors of spiders from extremely low frequency 5 Hz to 200 Hz, and the effective stiffness of spiders is dependent on the input voltage level, which is higher level with lower stiffness.

Paper Details

Date Published: 3 December 2014
PDF: 8 pages
Proc. SPIE 9297, International Symposium on Optoelectronic Technology and Application 2014: Laser and Optical Measurement Technology; and Fiber Optic Sensors, 92971L (3 December 2014); doi: 10.1117/12.2072980
Show Author Affiliations
Xiaopeng Kong, National Univ. of Defense Technology (China)
Xinwu Zeng, National Univ. of Defense Technology (China)
Zhangfu Tian, National Univ. of Defense Technology (China)


Published in SPIE Proceedings Vol. 9297:
International Symposium on Optoelectronic Technology and Application 2014: Laser and Optical Measurement Technology; and Fiber Optic Sensors
Jurgen Czarske; Shulian Zhang; David Sampson; Wei Wang; Yanbiao Liao, Editor(s)

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