Crystals, Journal Year: 2024, Volume and Issue: 15(1), P. 13 - 13

Published: Dec. 26, 2024

Seismic metamaterials are an emerging vibration-damping technology, yet concentrating the bandgap in low-frequency range remains challenging due to constraints imposed by lattice size. In this study, we numerically investigated seismic connected auxetic (negative Poisson’s ratio) slender strips, which exhibit exceptionally wide band gap for vibration isolation. Using a finite element method, first performed comparative analysis of several representative metamaterial configurations. The results showed that thin strip-connected steel column structure demonstrated outstanding performance, with complete starting at 1.61 Hz, ending 80.40 spanning width 78.79 and achieving relative bandwidth 192.15%. Notably, while most existing designs feature constants ten-meter (with smallest around two meters), our proposed achieves these constant only one meter. We further analyzed transmission characteristics structure, both without concrete filling. Interestingly, significant attenuation, approaching 70 dB, was observed below (approximately 0.22–1.17 Hz), even use concrete. By comparing flexural wave spectrum, attributed attenuation primarily presence gap, phenomenon often overlooked previous studies. This lower frequencies highlights potential effectively reducing energy. To enhance number periods propagation direction can be increased. Additionally, systematically explored influence geometric parameters on gap. found optimal were achieved strip length 0.05 m, its between 0.1 m. Our findings underscore critical role strips broadband approach presented along discovery gaps, provides valuable insights engineering other applications requiring effective reduction strategies.

Language: Английский