Tailored Mechanical Metamaterials with Programmable Quasi‐Zero‐Stiffness Features for Full‐Band Vibration Isolation
Tailored Mechanical Metamaterials with Programmable Quasi‐Zero‐Stiffness Features for Full‐Band Vibration Isolation
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具有可编程准零刚度特性的定制机械超材料用于全频带振动隔离
DOI：
10.1002/adfm.202101428
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发表时间：
2021-06
影响因子：
19
通讯作者：
Quan Zhang;Dengke Guo;G. Hu
中科院分区：
文献类型：
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作者：
Quan Zhang;Dengke Guo;G. Hu
高静态低动态刚度的准零刚度（QZS）隔离器在超低频振动缓解中发挥着重要作用。虽然当前的 QZS 设计主要利用负刚度校正器和正刚度元件的组合，并且只有一个 QZS 工作范围，但本文提出了一类具有可编程 QZS 功能的定制机械超材料。这些编程结构包含弯曲梁，其几何形状经过专门设计，可实现规定的 QZS 特性。当这些超材料被压缩时，曲梁依次达到规定的 QZS 工作范围，从而实现具有多个 QZS 工作范围的定制阶梯式力-位移曲线。压缩测试表明，可以实现巨大的设计空间来对超材料的 QZS 特性进行编程。进一步的振动测试证实了所提出的机械超材料的超低频隔振能力。 QZS 的机制完全源于曲梁的结构几何形状，因此与材料无关。这种设计策略为创新具有多个工作范围的紧凑且可扩展的 QZS 隔离器开辟了一条新途径。
Quasi‐zero‐stiffness (QZS) isolators of high‐static‐low‐dynamic stiffness play an important role in ultra‐low frequency vibration mitigation. While the current designs of QZS mainly exploit the combination of negative‐stiffness corrector and positive‐stiffness element, and only have a single QZS working range, here a class of tailored mechanical metamaterials with programmable QZS features is proposed. These programmed structures contain curved beams with geometries that are specifically designed to enable the prescribed QZS characteristics. When these metamaterials are compressed, the curved beams reach the prescribed QZS working range in sequence, thus enabling tailored stair‐stepping force‐displacement curves with multiple QZS working ranges. Compression tests demonstrate that a vast design space is achieved to program the QZS features of the metamaterials. Further vibration tests confirm the ultra‐low frequency vibration isolation capability of the proposed mechanical metamaterials. The mechanism of QZS stems solely from the structural geometry of the curved beams and is therefore materials‐independent. This design strategy opens a new avenue for innovating compact and scalable QZS isolators with multiple working ranges.