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| 基于旋转的多阶非对称机械超材料的低频宽带设计 |
| Low frequency wideband design of multi-order asymmetric mechanical metamaterials based on rotation |
| 投稿时间：2024-06-13 修订日期：2024-07-24 |
| DOI： |
| 中文关键词: 机械超材料 非对称 多阶 带隙 拉胀 |
| 英文关键词:mechanical metamaterials asymmetry multi-order band gap auxetic |
| 基金项目:国家自然科学基金(12072058)资助项目. |
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| 中文摘要: |
| 针对弹性波超材料的低频与宽带不可并存的问题，本文通过旋转构造非对称机械超材料实现低频带隙，并引入多阶进一步拓宽了低频带隙。通过利用反手性材料的节点旋转和韧带弯曲变形特征，通过韧带折叠逐步调节反四手性单胞对角线的振动体大小和韧带刚度，实现多阶的非对称单胞设计，并通过对带隙上下边界的共振模态与传输特性的分析阐明了弹性波带隙的产生和变化机理。研究表明：在非对称模式下，利用手性材料的节点旋转和韧带弯曲变形特征，实现质量块的旋转共振并打开带隙，通过交替排列的2对不同质量块之间的共振叠加拓宽带隙。最后通过实验验证了所提出的非对称机械超材料具有更出色的宽带和低频隔振性能。 |
| 英文摘要: |
| Considering the issue that low frequency and broadband of elastic wave metamaterials cannot coexist, this paper realizes low-frequency band gap by rotating asymmetric mechanical metamaterials, and further widens the low-frequency bandgap by introducing multiple orders. By utilizing the node rotation and ligament bending deformation characteristics of anti-chiral materials, the vibration body size and ligament stiffness of the anti-tetra chiral unit cell diagonal are gradually adjusted through ligament folding, and the multi-order asymmetric unit cell design is realized. The generation and change mechanism of elastic wave bandgap are explained by analyzing the resonance mode and transmission characteristics of the upper and lower boundaries of the bandgap. The study shows that: in the asymmetric mode, the node rotation and ligament bending deformation characteristics of chiral materials are utilized to realize the rotation resonance of the mass block and open the bandgap, and the band gap is widened by the resonant superposition between two pairs of different mass blocks arranged alternately. Finally, the proposed asymmetric mechanical metamaterial is verified by experiments to have to demonstrate improved broadband and low-frequency vibration isolation performance. |
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