Anisotropic Metallic Microlattice Structures for Underwater Operations
Anisotropic Metallic Microlattice Structures for Underwater Operations
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用于水下作业的各向异性金属微晶格结构
DOI：
10.1002/adem.202201294
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发表时间：
2022
影响因子：
3.6
通讯作者：
Fang, Nicholas X.
中科院分区：
文献类型：
--
作者：
Shen, Chen;Rohde, Charles;Cushing, Colby W.;Li, Junfei;Tan, Zheng Jie;Du, Huifeng;Peng, Xiuyuan;Wilson, Preston S.;Haberman, Michael R.;Fang, Nicholas X.
超材料为波浪操纵提供了前所未有的潜力。然而，它们在水声控制中的应用在很大程度上还没有被探索。这是因为材料选择有限，复杂结构缺乏可靠的制造技术。为此，提出了一种以微晶格结构为构件的水下作业超材料。通过设计超材料的构件并以分层的方式组装它们，各向异性被嵌入到结构中，这导致在垂直方向上产生不同的有效声速。所设计的超材料是由铝和钢通过金属添加剂制造而成的。利用谐振管进行了实验，以评估其在水中的性能。得到的各向异性比约为2，与数值模拟结果吻合较好。提出的超材料为水声控制提供了一种有效的手段，降低了制造难度，提高了使用寿命。
Metamaterials have offered unprecedented potentials for wave manipulations. However, their applications in underwater acoustic wave control have remained largely unexplored. This is because of the limited material choices and the lack of reliable fabrication techniques for the complicated structures. Herein, a metamaterial with microlattice structures as the building blocks is proposed for underwater operations. By designing the building blocks of the metamaterial and assembling them in a layered fashion, anisotropy is embedded in the structure, which results along different effective sound speeds in orthogonal directions. The designed metamaterial is fabricated by metal additive manufacturing using aluminum and steel. Experiments are performed using a resonator tube to evaluate its performance in water. An anisotropy ratio of around 2 is achieved, which is in good agreement with numerical simulations. The proposed metamaterial provides an effective means for underwater sound control with reduced fabrication difficulties and increased service life.