Laser Doppler vibrometer measurement on spiders in moving-coil loudspeakers

Xiaopeng Kong; Xinwu Zeng; Zhangfu Tian

doi:10.1117/12.2072980

3 December 2014 Laser Doppler vibrometer measurement on spiders in moving-coil loudspeakers

Xiaopeng Kong, Xinwu Zeng, Zhangfu Tian

Proceedings Volume 9297, International Symposium on Optoelectronic Technology and Application 2014: Laser and Optical Measurement Technology; and Fiber Optic Sensors; 92971L (2014) https://doi.org/10.1117/12.2072980
Event: International Symposium on Optoelectronic Technology and Application 2014, 2014, Beijing, China

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.

Citation Download Citation

Xiaopeng Kong, Xinwu Zeng, and Zhangfu Tian "Laser Doppler vibrometer measurement on spiders in moving-coil loudspeakers", Proc. SPIE 9297, International Symposium on Optoelectronic Technology and Application 2014: Laser and Optical Measurement Technology; and Fiber Optic Sensors, 92971L (3 December 2014); https://doi.org/10.1117/12.2072980

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