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<p>Traditional vibration control methods often face difficulties in effectively addressing low-frequency vibrations, particularly under the frequency of 500 Hz. This paper designs a central ring-curve dentiform acoustic metamaterial (CRCDAM) and investigates the bandgap characteristics. By comparing with the transmission loss curve obtained from the acceleration vibration experiment, the accuracy of the bandgap is verified. The underlying generation mechanism of the low-frequency bandgap is elucidated through modal analysis, while parametric studies demonstrate the tunability of the bandgaps. The propagation of elastic wave in CRCDAM is studied by combining the group velocity and phase velocity. Furthermore, the study designs two types of layered gradient structures based on CRCDAM and quantitatively evaluates their vibration attenuation performance using the frequency bandwidth proportion corresponding to the selected attenuation thresholds. The results show that the CRCDAM has multiple wide bandgaps and the bandgap coverage can reach up to 71.9% within 500 Hz. Among the layered gradient structures and the uniform CRCDAM, the three-layered gradient structure demonstrates the widest frequency bandwidth under most attenuation thresholds, which indicates the layered gradient design significantly enhances the attenuation frequency range. This study offers a novel approach for acoustic metamaterials to address vibration issues below 500 Hz.</p>

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Experimental and numerical study on low-frequency bandgaps of a novel central ring-curve dentiform acoustic metamaterial and layered gradient structure

  • 期刊论文

  • 发表日期：

    2026年6月30日

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  • Qingyu Lin,
  • Anshuai Wang,
  • Liang Wang,
  • Yunxiang Ma,
  • Yongtao Sun,
  • Yansen Wu,
  • Jingxu Liu,
  • Zhaozhan Zhang,
  • Hongge Han,
  • Zhixia Wang

摘要

Traditional vibration control methods often face difficulties in effectively addressing low-frequency vibrations, particularly under the frequency of 500 Hz. This paper designs a central ring-curve dentiform acoustic metamaterial (CRCDAM) and investigates the bandgap characteristics. By comparing with the transmission loss curve obtained from the acceleration vibration experiment, the accuracy of the bandgap is verified. The underlying generation mechanism of the low-frequency bandgap is elucidated through modal analysis, while parametric studies demonstrate the tunability of the bandgaps. The propagation of elastic wave in CRCDAM is studied by combining the group velocity and phase velocity. Furthermore, the study designs two types of layered gradient structures based on CRCDAM and quantitatively evaluates their vibration attenuation performance using the frequency bandwidth proportion corresponding to the selected attenuation thresholds. The results show that the CRCDAM has multiple wide bandgaps and the bandgap coverage can reach up to 71.9% within 500 Hz. Among the layered gradient structures and the uniform CRCDAM, the three-layered gradient structure demonstrates the widest frequency bandwidth under most attenuation thresholds, which indicates the layered gradient design significantly enhances the attenuation frequency range. This study offers a novel approach for acoustic metamaterials to address vibration issues below 500 Hz.