Suppression of low-frequency ultrasound broadband vibration using star-shaped single-phase metamaterials  

作　　者：Rui Zhao Jian Zheng Jin Guo Yunbo Shi Hengzhen Feng Jun Tang Jun Liu 

机构地区：[1]Science and Technology on Electronic Test&Measurement Laboratory,North University of China,Taiyuan 030051,Shanxi,China [2]School of Mechatronical Engineering,Beijing Institute of Technology,Beijing 100081,China

出　　处：《Defence Technology（防务技术）》2024年第4期217-224,共8页Defence Technology

基　　金：National Natural Science Foundation of China(Grant Nos.51821003,52175524,61704158);the Natural Science Foundation of Shanxi Province(Grant No.202103021224206);Shanxi"1331 Project"Key Subjects Construction to provide fund for conducting experiments。

摘　　要：In order to suppress the low-frequency ultrasound vibration in the broadband range of 20 k Hz—100 k Hz,this paper proposes and discusses an acoustic metamaterial with low-frequency ultrasound vibration attenuation properties,which is configured by hybrid arc and sharp-angle convergent star-shaped lattices.The effect of the dispersion relation and the bandgap characteristic for the scatterers in star-shaped are simulated and analyzed.The target bandgap width is extended by optimizing the geometry parameters of arc and sharp-angle convergent lattices.The proposed metamaterial configured by optimized hybrid lattices exhibits remarkable broad bandgap characteristics by bandgap complementarity,and the simulation results verify a 99%vibration attenuation amplitude can be obtained in the frequency of20 k Hz—100 k Hz.After the fabrication of the proposed hybrid configurational star-shaped metamaterial by 3D printing technique,the transmission loss experiments are performed,and the experimental results indicate that the fabricated metamaterial has the characteristics of broadband vibration attenuation and an amplitude greater than 85%attenuation for the target frequency.These results demonstrate that the hybrid configurational star-shaped metamaterials can effectively widen the bandgap and realize high efficiency attenuation,which has capability for the vibration attenuation in the application of highprecise equipment.

关 键 词：Star-shaped metamaterials BROADBAND Vibration attenuation Low-frequency ultrasound vibration Transmission loss 

分 类 号：TB34[一般工业技术—材料科学与工程] TB53[理学—物理]