研究了由穿孔板及吸声材料构成的双层阻抗复合吸声结构，在此基础上建立了其声学性能模型，并通过建立优化数字模型，对其结构的各个几何参数和物理参数进行了优化设计。%The acoustical properties of compound impedance in a double layersound absorbing structure is studied，Base on that，A model is constructed to optimize the double layer structure．the result obtained with MATLAB in computer can provide effective method for the design of sound Absorbing Structure．
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