近期，我校本科生曾秋宇（一作），教师程宝柱（通讯）等的研究成果“Investigation on low-frequency broadband pressure-bearing underwater hybrid honeycomb absorber based on weak coupling effect”在《Thin-Walled Structures》（TOP,IF=6.6）上发表。
论文简介如下：
本研究提出了带有橡胶涂层和不规则颈部的六边形金属蜂窝骨架的水下混合蜂窝吸声器（underwater hybrid honeycomb absorber，UHHA）。UHHA 在 359 Hz处实现了近乎完美的声吸收。对该声学超材料的颈部半径、长度、相对波数和相对粗糙度以及橡胶厚度进行参数优化，并基于有限元进行吸声机理分析。本研究从理论和模拟两个方面证明了尽管由四个准完美吸收单元组成的复合结构表现出较弱的吸声效果，但由四个不完美单元组成的结构显著增强了吸声效果，通过合理协调单元之间的耦合效应，整个系统的吸声系数可以得到显著提高。最终得到由四个不完美单元组成的52毫米厚度的复合结构能够实现高效的吸声效果，并且在400Hz到820Hz内实现了带宽为420Hz的高效声吸收（吸声系数大于0.8）。通过对该复合声学超表面进行水声管测试，测得该结构的高效声吸收带宽在334Hz-1027Hz，当水压为10MPa时，该结构在309Hz-1400Hz范围内的仍然具有0.69的平均吸声系数，该结构表现出了良好的承压性能。
本文的研究为水声超材料的宽带声学结构设计与水下低频噪声调控提供了重要的理论依据与技术支撑。
Marine exploration requires the use of underwater acoustic metamaterials with pressure resistance and low- frequency broadband absorption. To the end, this study proposes an underwater hybrid honeycomb absorber (UHHA), which employs a hexagonal metal honeycomb skeleton with a rubber coating and an irregular neck. The UHHA achieves near-perfect absorption at 359 Hz. The finite element method is employed to systematically analyze the sound absorption mechanism of acoustic metamaterials, optimizing structural parameters including the neck’s equivalent radius, equivalent length, relative wavenumber, relative roughness, and rubber layer thickness. This study demonstrates from both theoretical and simulation perfectives that although composite structures combining four quasi-perfect absorption units exhibit weak sound absorption, those formed by four imperfect units significantly enhance sound absorption. This shows that a system's absorption coefficient can be significantly enhanced by properly coordinating the coupling effects between the units. It is shown that the composite structure with a 52-mm thickness, composed of four imperfect units, can achieve efficient sound absorption ( α >0.8) within a 420-Hz bandwidth (400 Hz 820 Hz). Underwater acoustic tube testing of the composite acoustic metasurface shows that this structure efficiently absorbs sound over the 358 Hz - 1074 Hz range. A pressure test on the composite structure indicates that at a water pressure is of 10 MPa, an average sound absorption coefficient is 0.63 across the 100 Hz – 1300 Hz band, demonstrating satisfactory pressure- bearing performance. The research presented in this paper provides an important theoretical basis and tech nical support for the regulation and control of underwater low-frequency noise.
链接：https://www.sciencedirect.com/science/article/pii/S0263823126003617
