Acoustic attenuation of a hybrid sonic crystal made with periodic cylindrical scatterers and cascaded porous panels in a broad frequency range is endeavoured in this paper. It is observed via simulations that, the insertion loss (IL) of hybrid configuration is larger than the summation of IL of individual contributors such as periodic scatterers and parallel porous panels in post first Bragg resonance frequency band. The key finding of the research is that the passband in post first Bragg resonance is turning to stopband on introducing the cascaded porous panels within scatterers. Other configurations such as periodic array of cylindrical scatterers in series with porous panels in upstream, downstream and bounded with porous panels are examined and compared. The potential of said claim is shown by investigating a multi-resonant array of scatterers with cascaded porous panels. Finally, the experimental results are presented to authenticate the observed findings of simulations.

本文试图在宽的频率范围内对由周期性圆柱体散射体和级联多孔板制成的混合声晶体进行声衰减。通过仿真观察到，混合构型的插入损耗（IL）大于各个贡献者（如周期性散射体和平行多孔板）在第一布拉格共振频段后的总和。该研究的关键发现是，在将一级联的多孔板引入散射体后，首次布拉格共振后的通带正转向阻带。检查并比较了其他配置，例如与多孔板在上游，下游和以多孔板为边界的圆柱状散射体的周期性排列。通过研究具有级联多孔板的多共振散射体阵列，可以显示出上述权利要求的潜力。最后，提出了实验结果以验证观察到的模拟结果。