Lightweight multifunctional metamaterial with low-frequency vibroacoustic reduction and load-bearing performances  

作　　者：Qi JIA Dianlong YU Donghai HAN Jihong WEN 

机构地区：[1]National Key Laboratory of Equipment State Sensing and Smart Support,College of Intelligence Science and Technology,National University of Defense Technology,Changsha 410073,China

出　　处：《Applied Mathematics and Mechanics(English Edition)》2025年第3期403-422,共20页应用数学和力学(英文版)

基　　金：Project supported by the National Natural Science Foundation of China(Nos.11991032 and 52241103);the Hunan Province Graduate Research Innovation Project of China(No.KY0409052440)。

摘　　要：Metamaterials can control and manipulate acoustic/elastic waves on a subwavelength scale using cavities or additional components.However,the large cavity and weak stiffness components of traditional metamaterials may cause a conflict between vibroacoustic reduction and load-bearing capacity,and thus limit their application.Here,we propose a lightweight multifunctional metamaterial that can simultaneously achieve low-frequency sound insulation,broadband vibration reduction,and excellent load-bearing performance,named as vibroacoustic isolation and bearing metamaterial(VIBM).The advent of additive manufacturing technology provides a convenient and reliable method for the fabrication of VIBM samples.The results show that the compressive strength of the VIBM is as high as 9.71 MPa,which is nearly 87.81%higher than that of the conventional grid structure(CGS)under the same volume fraction.Moreover,the vibration and sound transmission are significantly reduced over a low and wide frequency range,which agrees well with the experimental data,and the reduction degree is obviously larger than that obtained by the CGS.The design strategy can effectively realize the key components of metamaterials and improve their application scenarios.

关 键 词：multifunctional metamaterial low-frequency sound insulation broadband vibration reduction load bearing 

分 类 号：TB34[一般工业技术—材料科学与工程]