A theoretical model is developed to study the superior sound absorption performance of ultralight mirco-perforated sandwich panels with double-layer hierarchical honeycomb core. Numerical simulations are performed to validate theoretical model predictions and explore physical mechanisms underlying the sound absorption. Systematic parametric study is implemented to investigate the influence of specific structural parameters on sound absorption. To maximize sound absorption, optimal structural parameters of the hierarchical sandwich are obtained using the method of simulated annealing. It is demonstrated that viscous dissipation of the air inside micro-perforations and around inlet/outlet regions dominates sound absorption. Compared to micro-perforated sandwich panels with regular honeycomb core, not only the proposed hierarchical construction has much improved load-bearing capacity, but also significantly enhanced sound absorption covers a wide range of frequency.

建立了理论模型，以研究具有双层蜂窝状芯的超轻微穿孔夹芯板的卓越吸声性能。进行数值模拟以验证理论模型的预测并探究吸声的潜在物理机制。进行系统的参数研究以研究特定结构参数对吸声的影响。为了最大程度地吸收声音，使用模拟退火的方法获得了分层夹层结构的最佳结构参数。事实证明，微孔内部以及入口/出口区域周围的空气的粘性消散主导了声音的吸收。与具有规则蜂窝芯的微孔夹心板相比，