Abstract An ultra-lightweight sandwich panel with perforated honeycomb-corrugation hybrid (PHCH) core is innovated as a novel sound absorber, which demonstrates great sound absorption as well as excellent mechanical performance. Based on the hybrid-cored sandwich panel, small perforations of different diameters distributed heterogeneously on both the top facesheet and the corrugation are introduced to obtain perfect sound absorption at low frequencies with almost no deterioration in mechanical performance. Theoretical models for sound absorption coefficient and bending stiffness are established, then verified by numerical simulations. With specific mass taken into consideration, an integrated index is proposed to further evaluate the acoustic-mechanical property of the hybrid sandwich. It is found that the PHCH with thinner honeycomb always performs better at low frequencies, and the facesheet is more important to the acoustic-mechanical property than the corrugation. This new kind of lightweight sandwich constructions show promising engineering applications, capable of serving as multi-functional structures with great acoustic and mechanical properties at the same time.

中文翻译：

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异质穿孔蜂窝-波纹混合夹芯板作为吸声体

摘要 一种具有穿孔蜂窝-波纹混合（PHCH）芯材的超轻质夹芯板是一种新型吸声材料，具有良好的吸声性能和优异的机械性能。在混合芯夹芯板的基础上，在顶面板和波纹上引入了不均匀分布的不同直径的小穿孔，以获得完美的低频吸声，几乎不会降低机械性能。建立了吸声系数和弯曲刚度的理论模型，并通过数值模拟进行了验证。考虑到特定质量，提出了一个综合指标来进一步评估混合夹层的声学-机械性能。发现蜂窝较薄的PHCH在低频下表现更好，面板对声力学性能的影响比波纹更重要。这种新型轻质夹层结构显示出有前途的工程应用，能够同时用作具有出色声学和机械性能的多功能结构。