Experimental research and simulation of sound transmission loss for magnesium alloy laminated automotive dash

CHEN Xin-rui;HAO Zhi-yong;LIU Chi

Journal of Vibration and Shock ›› 2010, Vol. 29 ›› Issue (11) : 38-40,7.

PDF(1490 KB)
PDF(1490 KB)
Journal of Vibration and Shock ›› 2010, Vol. 29 ›› Issue (11) : 38-40,7.
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Experimental research and simulation of sound transmission loss for magnesium alloy laminated automotive dash

  • CHEN Xin-rui; HAO Zhi-yong; LIU Chi
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Abstract

Laminated panels can improve the sound insulation performance of the structure effectively. Therefore, magnesium alloy laminated structure has been used in automotive dash successfully. Based on Biot-Allard model, laminated dash coated with porous sound-absorption material system was set up. Sound transmission loss of dash was computed with structural-acoustic interaction method. This approach was validated by comparing the numerical solutions with experimental results. The results showed that sound insulation performance in low frequency range was very sensitive to boundary constraints conditions of the dash. The sound transmission loss of dash was increased with the enhancement of its joint stiffness. In mid-high frequency range, the coated porous sound-absorption material can improve the sound insulation performance of the dash. Thickening the dash can not increase its sound transmission loss unlimitedly, and results in higher cost and "sound insulation performance deterioration" in low-frequency range. Therefore, the thickness of absorption material should be moderate to make sure the acoustic performance of the dash was optimal in concerned frequency range.

Key words

magnesium alloy / laminated dash / structural-acoustic interaction method / Boit-Allard model / sound transmission loss

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CHEN Xin-rui;HAO Zhi-yong;LIU Chi. Experimental research and simulation of sound transmission loss for magnesium alloy laminated automotive dash[J]. Journal of Vibration and Shock, 2010, 29(11): 38-40,7
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