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Proceedings Paper

Optimization of sound absorbing performance for gradient multi-layer-assembled sintered fibrous absorbers
Author(s): Bo Zhang; Weiyong Zhang; Jian Zhu
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Paper Abstract

The transfer matrix method, based on plane wave theory, of multi-layer equivalent fluid is employed to evaluate the sound absorbing properties of two-layer-assembled and three-layer-assembled sintered fibrous sheets (generally regarded as a kind of compound absorber or structures). Two objective functions which are more suitable for the optimization of sound absorption properties of multi-layer absorbers within the wider frequency ranges are developed and the optimized results of using two objective functions are also compared with each other. It is found that using the two objective functions, especially the second one, may be more helpful to exert the sound absorbing properties of absorbers at lower frequencies to the best of their abilities. Then the calculation and optimization of sound absorption properties of multi-layer-assembled structures are performed by developing a simulated annealing genetic arithmetic program and using above-mentioned objective functions. Finally, based on the optimization in this work the thoughts of the gradient design over the acoustic parameters- the porosity, the tortuosity, the viscous and thermal characteristic lengths and the thickness of each samples- of porous metals are put forth and thereby some useful design criteria upon the acoustic parameters of each layer of porous fibrous metals are given while applying the multi-layer-assembled compound absorbers in noise control engineering.

Paper Details

Date Published: 2 April 2012
PDF: 8 pages
Proc. SPIE 8409, Third International Conference on Smart Materials and Nanotechnology in Engineering, 84090C (2 April 2012); doi: 10.1117/12.921710
Show Author Affiliations
Bo Zhang, Ningxia Univ. (China)
Liverpool Univ. (United Kingdom)
Weiyong Zhang, Ningxia Univ. (China)
Jian Zhu, Ningxia Univ. (China)

Published in SPIE Proceedings Vol. 8409:
Third International Conference on Smart Materials and Nanotechnology in Engineering
Jinsong Leng; Yoseph Bar-Cohen; In Lee; Jian Lu, Editor(s)

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