深度子波长超低和超宽带声学黑洞超材料
Yanni Zhang1,2, Wenjie Che3,4, Haolun Qin3,4
1Institute of Launch Dynamics, Nanjing University of Science and Technology, Nanjing, Jiangsu, China. yanni.zhang@njust.edu.cn.
Nature communications
|December 13, 2025
概括
这项研究引入了一种新的功率法密度定制复合材料,克服了声黑洞 (ABH) 的局限性. 这种新材料在超低频率上实现了高效的宽带波吸收,从而实现了先进的噪音和振动缓解.
科学领域:
- 声学 声学 在声学方面
- 材料科学 材料科学 材料科学
- 波浪工程 波浪工程
背景情况:
- 传统的声学超材料 (AMs) 和声学黑洞 (ABHs) 具有局限性,包括结构刚性受损,高精度加工需求和高切割频率.
- 这些局限性限制了ABH在波操纵中的操作频率范围和实际应用.
研究的目的:
- 克服传统ABH固有的局限性.
- 开发一种能够有效吸收超低频率和宽带频率的新型声学装置.
- 为了使深度亚波长的规模操作和减轻疲劳风险.
主要方法:
- 通过了一种根据权力法密度量身定制的复合材料 (ρ-ABH).
- 分析导出和波能分析.
- 结合系统建模和实验验证.
主要成果:
- 将切断和值频率降低到传统ABH的五分之一.
- 通过波长压缩和能量密度放大,实现了深度亚波长尺度操作 (λ/11).
- 从25-1200 Hz的25-1200 Hz的有效波吸收被证明具有24.5 Hz的值.
- 通过惯性分级诱导的振幅衰减减轻疲劳和骨折风险.
结论:
- ρ-ABH方法克服了AM和振动声学工程中的基本频率尺度限制.
- 可控制材料合成绕过了与传统ABHs相关的制造挑战.
- 这项技术为下一代噪音和振动减轻解决方案提供了一个有前途的途径.
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