基于遗传算法的圆柱空腔吸声覆盖层参数优化研究

Parameter optimization of sound absorption layer based on genetic algorithm

基于圆柱空腔吸声覆盖层二维理论推导吸声覆盖层单元-粘弹性圆柱管等效阻抗,结合传递矩阵法建立吸声覆盖层声学性能分析简化模型。采用遗传算法对圆柱-圆台空腔吸声覆盖层多个材料、结构参数进行综合优化研究。结果表明,较仅优化吸声覆盖层材料属性,对材料属性、结构多参数优化能获得更好宽频吸声性能。

The application of a two-dimensional model of sound absorption layer containing periodic cylindrical holes indicates that： when a plane wave is normally incident, the acoustic performance of sound absorption layer can be controlled by the first axisymmetric wave, at the frequency where the propagating attenuation of the first mode is lower than that of other higher modes. On this basis, the effective impedance of a cylindrical tube, which represents the unit cell of sound absorption layer, was derived. Besides, together with the transfer matrix method, the simplified model for the acoustic performance prediction of sound absorption layer was provided. The genetic algorithm was used to simultaneously optimize the parameters of material properties and structure of sound absorption layer which contains periodical cylindricalconical holes. It is concluded that compared to the method of single optimization of material properties, the method of simultaneous optimization of material properties and structural parameters may result in a higher sound absorption coefficient in a wider frequency range.