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Layered Fibrous Treatments for a Sound Absorption and Sound Transmission
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Abstract
In this paper, experimental evidence will be presented to demonstrate that unstiffened, low density fibrous materials are “limp”: i.e., their in vacuo bulk stiffness is very small compared to that of air with the result that the materials' solid phase motion becomes acoustically significant. Next, a new limp porous material model is presented. It is shown that this model may be used in conjunction with transfer matrices to predict the absorption or transmission loss of arbitrarily layered combinations of fibrous layers, permeable or impermeable membranes, and air spaces. The predictions of this model agree well with experimental measurements and so may be used to optimize sound absorption or transmission treatments.
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Lai, H., Katragadda, S., Bolton, J., and Alexander, J., "Layered Fibrous Treatments for a Sound Absorption and Sound Transmission," SAE Technical Paper 972064, 1997, https://doi.org/10.4271/972064.Also In
References
- Delany M.E. Bazley E.N. 1970 “Acoustical Properties of Fibrous Absorbent Materials” Applied Acoustics 3 105 116
- Bies D.A. Hansen C.H. 1980 “Flow Resistance Information For Acoustical Design” Applied Acoustics 13 357 391
- Tarnow V. 1996 “Airflow Resistivity of Models of Fibrous Acoustic Materials” J. of the Acoust. Soc. Am. 100 3706 3713
- Allard J.F. 1993 Propagation of Sound in Porous Media: Modeling Sound Absorbing Materials Elsevier Science Publishers New York
- Biot M.A. 1956 “Theory of Propagation of Elastic Waves in a Fluid-Saturated Porous Solid. I. Low Frequency Range. II. High Frequency Range” J. of the Acoust. Soc. Am. 28 168 191
- Lai H.-Y. Katragadda S. Bolton J.S. 1997 “A Model for Sound Absorption by and Sound Transmission Through Limp Fibrous Layers” J. of the Acoust Soc. Am.
- Brown R.J.S. Korringa J. 1975 “On the Dependence of the Elastic Properties of a Porous Rock on the Compressibility of a Pore Fluid” Geophysics 40 40 608 616
- Beranek L.L. 1988 Noise and Vibration Control Institute of Noise Control Engineering Washington, DC 1988
- Irwin J.D. Graf E.R. 1979 Industrial Noise and Vibration Control Prentice-Hall