The average sound absorption coefficient of a composite absorber from 0 to 1.6 kHz was maximized using a teaching–learning-based optimization algorithm, where the geometric parameters were used as optimization variables. The effective-medium model and transfer-matrix method were used to calculate the sound absorption coefficient, and optimized sound absorption coefficient was maximized at 0.938. The specific acoustic impedance of the material is almost perfectly matched with air thanks to the optimized size of the lateral plates, micro-perforated plates, and cavities. Experimental results confirm the theoretical calculation, showing the investigated passive acoustic design method of designing sound absorber.

使用基于教学的优化算法，将几何参数用作优化变量，使复合吸声器在 0 到 1.6 kHz 范围内的平均吸声系数最大化。采用有效介质模型和传递矩阵法计算吸声系数，优化吸声系数最大为0.938。由于侧板、微孔板和空腔的尺寸经过优化，材料的特定声阻抗几乎与空气完美匹配。实验结果证实了理论计算，显示了所研究的设计吸声体的被动声学设计方法。