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TECHNICAL PAPERS

Effect of Material and Geometry on the Sound and Vibration Transmission across a Sandwich Beam

[+] Author and Article Information
Priya Thamburaj, J. Q. Sun

Department of Mechanical Engineering, University of Delaware, Newark, DE 19716

J. Vib. Acoust 123(2), 205-212 (Sep 01, 2000) (8 pages) doi:10.1115/1.1343083 History: Received November 01, 1998; Revised September 01, 2000
Copyright © 2001 by ASME
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References

Figures

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An illustration of the sound transmission through a sandwich partition
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The variation of the vibration transmission loss with the core coupling parameter. The solid line represents the value of the core coupling: Q15=0.5×107 N/m2 and Q35=0.8×107 N/m2.
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The effect of core coupling on the sound transmission loss with no skin coupling. The dash-dot line is for the case of core coupling: Q15=0.5×103 N/m2 and Q35=0.8×103 N/m2 and the solid line for higher values: Q15=0.5×107 N/m2 and Q35=0.8×107 N/m2.
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An illustration of the effect of damping and coupling on the vibration transmission loss. The damping is only in the core with cu2=cw2=1.0×103 Ns/m. The material coupling in the core is specified by Q35=0.8×107 N/m2. The dash-dot line is the case of no coupling or damping. This line is overlapped by the solid line in the figure at the top.
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The effect of damping as compared with that of the material coupling on the sound transmission loss. The amount of damping in this case is cu2=cw2=1.0×103 Ns/m and is only in the core. The material coupling in the core is specified by Q35=0.8×107 N/m2. The dash-dot line is the case of no coupling or damping.
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The effect of both coupling and damping in the core on the sound transmission loss. A coupling is given by Q35=0.8×107 N/m2 and a damping is cu2=cw2=1.0×103 Ns/m.
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The variation of the sound transmission loss with frequency for different core thicknesses. The dark solid line is the only case in the presence of material coupling. The total thickness of the beam is 60 mm and the skins are assumed to be identical for all cases.
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The effect of the thickness of the top skin on the sound transmission loss. The dark solid line represents the case with material coupling. The entire beam is 60 mm thick and tb=5 mm.
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The effect of the thickness of the bottom skin on the sound transmission loss. The dark solid line represents the case in the presence of material coupling at tb=5 mm. In all cases, tt=5 mm and the total thickness of the beam is 60 mm.
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The effect of the core density on the sound transmission loss. In both plots, the dash line is the case of no coupling while the solid line is that with the material coupling in the core: Q15=0.5×107 N/m2 and Q35=0.8×107 N/m2. Low density of the core is 130 Kg/m3 and high density of core is 1760 Kg/m3 .

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