Sage Journals: Discover world-class research

Abstract

Noise can be reduced by sound barrier materials, and transmission loss (TL) measurements are used to determine the insulation performance of sound barriers. In this paper, TL of the non-woven composites with two surface layers and three base layers was measured and analyzed using Brüel and Kjær impedance tubes and Pulse software. The results show that non-woven composites with activated carbon fiber (ACF) non-woven as a surface layer had significantly higher values of average TL than glass fiber-surfaced composites in both the low frequency range (100—1600 Hz) and the high frequency range (1600—6400 Hz). Regarding the sound barrier performance, base non-wovens made of cotton and ramie were better than polypropylene-based non-wovens in the whole frequency range, while at the low frequencies, especially below 600 Hz, glass fiber-surfaced non-woven was better than ACF-surfaced non-woven. The composite with cotton non-woven as a base and ACF as a surface exhibited the highest average TL value of 8.56 dB and the lowest mass per unit area of 106 g/m².

Keywords

cotton ramie polypropylene glass fiber activated carbon fiber non-woven composite noise insulation transmission loss

Get full access to this article

View all access options for this article.

References

Chen, Y. , and Jiang, N. , Carbonized and Activated Non-Wovens as High-Performance Acoustic Materials: Part I - Noise Absorption, Text. Res. J., 77, 785-791 (2007).

Harrison, M. , "Vehicle Refinement: Controlling Noise and Vibration in Road Vehicles," SAE International, Warrendale, PA, 2004.

Minten, M. , Cops, A. , and Wijnants, F. , The Sound Transmission Loss of a Single Panel Measured with the Two-Microphone and the Conventional Method-Comparison with the Statistical Energy Analysis Model, App. Acoust., 22, 281-295 (1987).

Callister, J.R. , George, A.R. , and Freeman, G.E. , An Empirical Scheme to Predict the Sound Transmission Loss of Single-Thickness Panels, J. Sound Vibr. , 222, 145-151 (1999).

Sewell, E.C. , Transmission of Reverberant Sound Through a Single-Leaf Partition Surrounded by an Infinite Rigid Baffle, J. Sound Vibr., 12, 21-32 (1970).

Cremer, L. , Calculation of Sound Propagation in Structures, Acustica, 3, 317-335 (1953).

Tadeu, A. , and Antonio, J.M.P. , Acoustic Insulation of Single Panel Walls Provided by Analytical Expressions Versus the Mass Law, J. Sound Vibr., 257, 457-475 (2002).

Song, B.H. , and Bolton, J.S. , A Transfer-Matrix Approach for Estimating the Characteristic Impedance and Wave Numbers of Limp and Rigid Porous Materials, J. Acoust. Soc. Amer., 107, 1131-1152 (2000).

SAS Institute Inc., SAS/STAT User's Guide, Release 9.0 Edition, SAS Institute Inc., Cary, NC, 2004 .

Carbonized and Activated Non-woven as High Performance Acoustic Materials: Part II Noise Insulation

Abstract

Keywords

Get full access to this article

References