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TECHNICAL PAPERS

On the Absorption Coefficient of Porous Corrugated Surfaces

[+] Author and Article Information
Francisco Simón, Rosa M. Rodrı́guez, Jaime Pfretzschner

Instituto de Acústica (CSIC). C. Serrano, 144. 28006 Madrid, Spain

J. Vib. Acoust 124(3), 329-333 (Jun 12, 2002) (5 pages) doi:10.1115/1.1471528 History: Received November 01, 2000; Revised February 01, 2002; Online June 12, 2002
Copyright © 2002 by ASME
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References

Figures

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Ridgy sample with test specimen indicated
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Sample profile. External surface is approximated by a stepped profile.
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Convergence of acoustic absorption with increasing number of steps relative to M=1200
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Acoustical absorption coefficient as a function of frequency of cylindrical wedges of glass wool. σ=5600 Pa⋅s⋅m−2,d=0.1 m.
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Acoustical absorption coefficient, as a function of frequency of cylindrical wedges of glass wool. σ=5600 Pa⋅s⋅m−2,d=0.1 m.
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Acoustical absorption coefficient as a function of frequency of cylindrical wedges of glass wool. σ=5600 Pa⋅s⋅m−2,d=0.1 m.
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Acoustical absorption coefficient as a function of frequency of rubber crumb samples. q2=1.5,Ω=0.54,σ=3000 Pa⋅s⋅m−2,d=0.1 m,sρ=2.5,sk=0.35 Continuous line: bmin=0.05 m,bmax=0.12 m,V=0.03 m. Dashed line: cylindrical specimen. Where sρ is an adjustable parameter which is connected to the viscosity dependence inside the material and the adjustable parameter sk is the termal pore shape factor 14.
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Acoustical absorption coefficient as a function of frequency of a cylindrical wedge of glass wool. σ=8400 Pa⋅s⋅m−2,d=0.1 m. Curve a: results for the wedge, and curve b: wedge with an air gap (sketch dimensions in cm.).

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