Application of Multi-Layered Polyurethane Foams for Flat-Walled Anechoic Linings

J. F. Xu, Jörg Buchholz, Fergus R. Fricke

Research output: Contribution to journalJournal articleResearchpeer-review


Previous work demonstrated that a multi-objective evolutionary algorithm could be successfully employed as an optimiser to make the design of flat-walled multi-layered anechoic linings more efficient. In the present work, such an algorithm is employed to investigate the practical aspects of the application of multi-layered polyurethane foams as the flat-walled anechoic lining. The investigation includes aspects such as the efficacy of a single layer of material, the minimum number of layers of linings to achieve the minimum overall thickness for low (100Hz), mid (250Hz) and high (500Hz) cut-off frequencies, the use of the three-layered lining composite for low to mid cut-off frequencies and the effect of air gaps.
Original languageEnglish
JournalApplied Acoustics
Issue number5
Pages (from-to)476-485
Publication statusPublished - 2006


  • anechoic chamber
  • anechoic lining
  • building acoustics


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