Bandgap characteristics analysis and graded design of a novel metamaterial for flexural wave suppression  

作　　者：Fan YANG Zhaoyang MA Xingming GUO 

机构地区：[1]Shanghai Key Laboratory of Mechanics in Energy Engineering,Shanghai Institute of Applied Mathematics and Mechanics,School of Mechanics and Engineering Science,Shanghai University,Shanghai 200072,China [2]Shanghai Institute of Aircraft Mechanics and Control,Shanghai 200092,China

出　　处：《Applied Mathematics and Mechanics(English Edition)》2025年第1期1-24,共24页应用数学和力学(英文版)

基　　金：Project supported by the National Natural Science Foundation of China(Nos.11872233,U2341231,and 12102245)。

摘　　要：A novel elastic metamaterial is proposed with the aim of achieving lowfrequency broad bandgaps and bandgap regulation.The band structure of the proposed metamaterial is calculated based on the Floquet-Bloch theorem,and the boundary modes of each bandgap are analyzed to understand the effects of each component of the unit cell on the bandgap formation.It is found that the metamaterials with a low elastic modulus of ligaments can generate flexural wave bandgaps below 300 Hz.Multi-frequency vibrations can be suppressed through the selective manipulation of bandgaps.The dual-graded design of metamaterials that can significantly improve the bandgap width is proposed based on parametric studies.A new way that can regulate the bandgap is revealed by studying the graded elastic modulus in the substrate.The results demonstrate that the nonlinear gradient of the elastic modulus in the substrate offers better bandgap performance.Based on these analyses,the proposed elastic metamaterials can pave the way for multi-frequency vibration control,low-frequency bandgap broadening,and bandgap tuning.

关 键 词：METAMATERIAL flexural wave bandgap local resonance graded design 

分 类 号：O421.5[理学—声学]