Energy focusing of broadband Lamb wave by designing excitation waveforms and elastic metamaterials

Daiyao Du; Jiadong Hua; Chun Cui; Jing Lin

doi:10.1016/j.ultras.2024.107294

Energy focusing of broadband Lamb wave by designing excitation waveforms and elastic metamaterials

Ultrasonics. 2024 Apr:139:107294. doi: 10.1016/j.ultras.2024.107294. Epub 2024 Mar 11.

Authors

Daiyao Du¹, Jiadong Hua², Chun Cui³, Jing Lin⁴

Affiliations

¹ School of Reliability and Systems Engineering, Beihang University, Xueyuan Road No. 37, Haidian District, Beijing, China. Electronic address: dudaiyao713@buaa.edu.cn.
² School of Reliability and Systems Engineering, Beihang University, Xueyuan Road No. 37, Haidian District, Beijing, China; Science & Technology on Reliability and Environmental Engineering Laboratory, Beihang University, Xueyuan Road No. 37, Haidian District, Beijing, China. Electronic address: huajiadong@buaa.edu.cn.
³ School of Reliability and Systems Engineering, Beihang University, Xueyuan Road No. 37, Haidian District, Beijing, China. Electronic address: cuichun0403@buaa.edu.cn.
⁴ Science & Technology on Reliability and Environmental Engineering Laboratory, Beihang University, Xueyuan Road No. 37, Haidian District, Beijing, China. Electronic address: linjing@buaa.edu.cn.

PMID: 38479109
DOI: 10.1016/j.ultras.2024.107294

Abstract

In the field of structure health monitoring (SHM), the use of Lamb wave to locate damage is a common method. Energy focusing is beneficial for damage localization because of higher SNR and higher resolution. Optimization design of elastic metamaterials is promising for energy focusing based on speed modulation. However, current design scheme is effective only for narrowband Lamb waves. Compared to narrowband waves, broadband Lamb waves with a larger frequency range carry richer structural information. In this study, an energy focusing method based on broadband Lamb waves by simultaneous designing excitation waveforms and elastic metamaterials is proposed. Firstly, COMSOL finite element simulation software is used to calculate the relationship between the metamaterial structure and the excitation wave. Subsequently, the metamaterial structure and the excitation signal form are designed according to the relationship. Finally, the metamaterial structure is bonded with the aluminum plate using 3D printing PA2200 nylon to verify the effectiveness of the method.

Keywords: Energy focusing; Lamb waves; Metamaterials; Waveform design.