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Optimal Acoustic Attenuation of Weakly Compressible Media Permeated with Air Bubbles
作者姓名:梁彬  程建春
作者单位:Laboratory of Modern Acoustics and Institute of Acoustics, Nanjing University, Nanjing 210093
基金项目:Supported by the Ministry of Education of China under Grant No 705017, the State Key Basic Research Programme of China under Grant No 51315, and the Excellent Youth Science Foundation of China under Grant No 10125417.
摘    要: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 lO(dB/cm). Such bubbly media with optimal acoustic attenuations may be applied to design acoustic absorbent by controlling broader attenuation band and higher efficiency.

关 键 词:声学  声音衰减  渗透物  气泡
收稿时间:2006-7-3
修稿时间:2006-07-03

Optimal Acoustic Attenuation of Weakly Compressible Media Permeated with Air Bubbles
LIANG Bin,CHENG Jian-Chun.Optimal Acoustic Attenuation of Weakly Compressible Media Permeated with Air Bubbles[J].Chinese Physics Letters,2007,24(6):1607-1610.
Authors:LIANG Bin  CHENG Jian-Chun
Institution:Laboratory of Modern Acoustics and Institute of Acoustics, Nanjing University, Nanjing 210093
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 mediumpermeated 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.
Keywords:43  20  Bi  43  20  Jr  43  35  Mr
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