Flat-walled multilayered anechoic linings

Optimization and application

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

*Corresponding author for this work

Research output: Contribution to journalArticle

12 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)3104-3109
Number of pages6
JournalJournal of the Acoustical Society of America
Issue number5
Publication statusPublished - Nov 2005
Externally publishedYes

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