基于声学虹吸效应的水下低频大宽带吸声机理研究

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Abstract The simulation model of thin plate metamaterial is established by using finite element software COMSOL, and its low frequency and wide band sound absorption mechanism is studied on the basis of acoustic siphon effect. By exploring the mechanism of differential pressure acoustic convergence, acoustic impedance matching and negative dynamic equivalent density under the action of acoustic siphon effect, the low frequency and wide band sound absorption performance of the metamaterial is verified. the effects of parameters such as area ratio, sheet thickness and mass height on the sound absorption properties of thin plate metamaterials are discussed. The results show that when a plane wave of a certain frequency is incident on the metamaterial, the resonance will occur at a certain position of the cell and has the maximum sound absorption. in the case of different area ratio, the metamaterial still has a relatively matching acoustic impedance. Almost all the incident energy can be forced to flow to the resonant cell to enhance the cell vibration and still maintain a good sound absorption effect. When the thickness of the sheet becomes smaller or the height of the mass increases, the peak frequency of the sound absorption coefficient will shift to low frequency. Finally, the low frequency and wide band sound absorption of underwater 100-500Hz is realized by reasonably designing and optimizing the parameters of thin plate metamaterials.
Key words: low frequency; large broadband; sound absorption; area ratio

Key words： low frequency large broadband sound absorption area ratio

Received: 01 June 2021 Published: 28 August 2022

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	Articles by authors
	MA Chengzhi1
	2
	WANG Libo1
	2
	WU Xiao1
	2
	WU Jiuhui1
	2

Cite this article:

MA Chengzhi1,2,WANG Libo1, et al. A study on the mechanism of underwater low frequency and wide band sound absorption based on acoustic siphon effect[J]. JOURNAL OF VIBRATION AND SHOCK, 2022, 41(16): 100-107.

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http://jvs.sjtu.edu.cn/EN/ OR http://jvs.sjtu.edu.cn/EN/Y2022/V41/I16/100

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