材料科学
超材料
吸收(声学)
宽带
电阻抗
超材料吸收剂
航程(航空)
光电子学
声学
光学
复合材料
物理
可调谐超材料
量子力学
作者
Chongrui Liu,Zhengrui Yang,Xiaoli Liu,Jiu Hui Wu,Fuyin Ma
出处
期刊:APL Materials
[American Institute of Physics]
日期:2023-10-01
卷期号:11 (10)
被引量:40
摘要
We present an ultra-broadband acoustic metamaterial with inhomogeneous high-order Fabry–Pérot (FP) resonances that achieves near-perfect continuous absorption in the range of 400–10000 Hz. The unit is composed of multiple FP channels with inhomogeneous cross-sectional areas, allowing for flexible adjustment of the impedance characteristics of each channel. This approach prevents the high-order peaks’ resistances from increasing rapidly and ensures a smooth resistance characteristic across a broad frequency range. As a result, the absorption performance in the high-frequency range above 3000 Hz can be significantly enhanced, eliminating the need for conventional porous materials. The inhomogeneous high-order absorption mechanism is investigated thoroughly by theoretical calculations and finite element simulations. By critically coupling the FP channels, a 27-cell broadband metamaterial is obtained with an average absorption coefficient above 90% over 400–10000 Hz, which is verified by experiments in a square impedance tube and an alpha-cabin reverberation room, respectively. Characterized by its extraordinary performance and easy-fabricated structure, this metamaterial has great potential in noise control engineering applications, especially in environments with low temperature, high humidity, or significant dustiness.
科研通智能强力驱动
Strongly Powered by AbleSci AI