计算力学学报2025，Vol.42Issue(5)：758-764,7.DOI:10.7511/jslx20240613001
基于旋转的多阶非对称机械超材料的低频宽带设计
Low frequency broadband design of multi-order asymmetric mechanical metamaterials based on rotation
摘要
Abstract
Considering the issue that low frequency and broadband of elastic wave metamaterials cannot coexist,this paper realizes a 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 bounds 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.关键词
机械超材料/非对称/多阶/带隙/拉胀Key words
mechanical metamaterials/asymmetry/multi-order/band gap/auxetic引用本文复制引用
王小鹏,陈文炯,黎胜..基于旋转的多阶非对称机械超材料的低频宽带设计[J].计算力学学报,2025,42(5):758-764,7.基金项目
国家自然科学基金(12072058)资助项目. （12072058）
