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Optimal Acoustic Attenuation of Weakly Compressible Media Permeated with Air Bubbles |
| LIANG Bin;CHENG Jian-Chun |
| Laboratory of Modern Acoustics and Institute of Acoustics, Nanjing University, Nanjing 210093 |
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| Cite this article: |
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LIANG Bin, CHENG Jian-Chun 2007 Chin. Phys. Lett. 24 1607-1610 |
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Abstract Based on fuzzy logic (FL) and genetic algorithm (GA), we present an optimization method to obtain the optimal acoustic attenuation of a longitudinal acoustic wave propagating in a weakly compressible medium
permeated with air bubbles. In the optimization, the parameters of the size distribution of bubbles in the medium are optimized for providing uniformly high acoustic attenuation in the frequency band of interest. Compared with other traditional optimization methods, the unique advantage of the present method is that it can locate the global optimum quickly and effectively in need of knowing the mathematical model precisely. As illustrated by a numerical simulation, the method is effective and essential in enhancing the acoustic attenuation of such a medium in an optimal manner. The bubbly medium with optimized structural parameters can effectively attenuate longitudinal waves at intermediate frequencies with an acoustic attenuation approximating a constant value of 10(dB/cm). Such bubbly media with optimal acoustic attenuations may be applied to design acoustic absorbent by controlling broader attenuation band and higher efficiency.
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| Keywords:
43.20.Bi
43.20.Jr
43.35.Mr
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Received: 03 July 2006
Published: 17 May 2007
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| PACS: |
43.20.Bi
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(Mathematical theory of wave propagation)
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43.20.Jr
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(Velocity and attenuation of elastic and poroelastic waves)
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43.35.Mr
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(Acoustics of viscoelastic materials)
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