In anechoic chambers, the flat-walled multilayered acoustic lining systems are cheaper and easier to install than conventional wedge type systems. Sequence, material and thickness of layers are all design variables. By choosing the right configuration, the acoustical performance and overall thickness of flat-walled multilayered systems can be comparable to conventional wedge systems. In this study, the materials considered include air and poroelastic materials such as polyurethane foams, melamine foams, and glass wool. In order to evaluate acoustical performance of a given configuration, the poroelastic materials are modeled using Biot’s formulations instead of a simpler impedance method to get more accurate results. A genetic algorithm implemented within ModeFRONTIER optimization software was used to select configurations which have a cut-off frequency of 100 Hz or less. The configuration that met this requirement with the smallest overall thickness was determined optimal. This configuration has an overall thickness of 65.8 cm and is composed of 4 different polyurethane foams. Since a considerable difference was observed between the cut-off frequencies obtained using Biot’s model and the simpler impedance method, this justifies the use of Biot’s model in the optimization.
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ASME 2012 Noise Control and Acoustics Division Conference at InterNoise 2012
August 19–22, 2012
New York City, New York, USA
Conference Sponsors:
- Noise Control and Acoustics Division
ISBN:
978-0-7918-4532-5
PROCEEDINGS PAPER
Accurate Designing of Flat-Walled Multi-Layered Lining System Using Genetic Algorithm for Application in Anechoic Chambers
Vahid Dabbagh
,
Vahid Dabbagh
Amirkabir University of Technology, Tehran, Iran
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Reza Keshavarz
,
Reza Keshavarz
Amirkabir University of Technology, Tehran, Iran
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Abdolreza Ohadi
Abdolreza Ohadi
Amirkabir University of Technology, Tehran, Iran
Search for other works by this author on:
Vahid Dabbagh
Amirkabir University of Technology, Tehran, Iran
Reza Keshavarz
Amirkabir University of Technology, Tehran, Iran
Abdolreza Ohadi
Amirkabir University of Technology, Tehran, Iran
Paper No:
NCAD2012-0609, pp. 227-235; 9 pages
Published Online:
September 10, 2013
Citation
Dabbagh, V, Keshavarz, R, & Ohadi, A. "Accurate Designing of Flat-Walled Multi-Layered Lining System Using Genetic Algorithm for Application in Anechoic Chambers." Proceedings of the ASME 2012 Noise Control and Acoustics Division Conference at InterNoise 2012. ASME 2012 Noise Control and Acoustics Division Conference. New York City, New York, USA. August 19–22, 2012. pp. 227-235. ASME. https://doi.org/10.1115/NCAD2012-0609
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