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Nov 2005

Volume 118, Issue 5, pp. 2741-3363

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Flat-walled multilayered anechoic linings: Optimization and application

Jingfeng Xu, Jörg M. Buchholz, and Fergus R. Fricke

J. Acoust. Soc. Am. Volume 118, Issue 5, pp. 3104-3109 (2005); (6 pages) | Cited 1 time

Online Publication Date: 28 Oct 2005

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Show Abstract
The concept of flat-walled multilayered absorbent linings for anechoic rooms was proposed three decades ago. Flat-walled linings have the advantage of being less complicated and, hence, less costly to manufacture and install than the individual units such as wedges. However, there are difficulties in optimizing the design of such absorbent linings. In the present work, the design of a flat-walled multilayered anechoic lining that targeted a 250 Hz cut-off frequency and a 300 mm maximum lining thickness was first optimized using an evolutionary algorithm. Sixteen of the most commonly used commercial fibrous building insulation materials available in Australia were investigated and fourteen design options (i.e., material combinations) were found by the evolutionary algorithm. These options were then evaluated in accordance with their costs and measured acoustic absorption performances. Finally, the completed anechoic room, where the optimized design was applied, was qualified and the results showed that a large percentage (75%–85%) of the distance between the sound source and the room boundaries, on the traverses made, were anechoic.
Show PACS
43.55.Pe Anechoic chamber design, wedges
43.55.Ev Sound absorption properties of materials: theory and measurement of sound absorption coefficients; acoustic impedance and admittance
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