Multimodal Local Resonators for Low-Frequency Amelioration of Acoustic Black Holes

• Published in: Materials Vol. 16; no. 13; p. 4579
• Main Authors: Zhao, Jing, Ma, Zhixin, Hu, Yiyang, Zeng, Jiacheng, Xu, Yuxin, Deng, Jie, Gao, Nansha
• Format: Journal Article
• Language: English
• Published: Switzerland MDPI AG 25.06.2023; MDPI
• Subjects: acoustic black holes; acoustic metamaterials; Acoustics; Black holes; Damping; Design; Energy; Finite element method; Low frequencies; low frequency; Metamaterials; Modal analysis; multimodal resonators; Propagation; Radiation; Research methodology; Resonators; Sound waves; Vibration; Vibration analysis; vibration reduction; vibration reduction; acoustic metamaterials; multimodal resonators; low frequency; acoustic black holes
• ISSN: 1996-1944; 1996-1944
• DOI: 10.3390/ma16134579

Acoustic black holes (ABHs) are effective at suppressing vibrations at high frequencies, but their performance at low frequencies is limited. This paper aims to improve the low-frequency performance of ABH plates through the design of a metamaterial acoustic black hole (MMABH) plate. The MMABH plate consists of a double-layer ABH plate with a set of periodic local resonators installed between the layers. The resonators are tuned to the low-frequency peak points of the ABH plate, which are identified using finite element analysis. To dissipate vibration energy, the beams of the resonators are covered with damping layers. A modal analysis of the MMABH plate is performed, confirming its damping effect over a wide frequency band, especially at low frequencies.