含局域共振单元复合材料格栅夹芯结构的吸声性能研究

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Abstract A sound-absorbing structure of composite grid sandwich which is resistant to hydrostatic pressure is proposed. The grid spaces are filled with polyurethane matrix. The soft rubber coated iron ball is embedded in the matrix as a local resonance scatterer unit. The sound absorption performances of the structure under normal pressure and 3MPa static pressure are stable after compared by finite element method. The sound absorption mechanism was analyzed through discussing the relationship between sound absorption coefficient, average energy dissipation, the displacement and energy dissipation density fields. Finally, the genetic algorithm is used to optimize the broadband sound absorption performance of the structure. After optimization, the average sound absorption performance is increased by 150% and reaches 0.99 at a low frequency point where the thickness of the structure is less than λ/14, so that the small sized structure is realized to control the low frequency sound waves. It is expected to realize low-frequency broadband sound absorption design by adding more materials and structural parameters in the optimization model or filling different grid spaces with sound absorption microstructures that work at different low frequency points.

Key words： Composite grid sandwich structure local resonant unit the genetic algorithm Static pressure Underwater sound absorption performance

Received: 01 June 2021 Published: 15 April 2022

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	Articles by authors
	LUO Yingqin
	LOU Jingjun
	ZHANG Yanbing

Cite this article:

LUO Yingqin,LOU Jingjun,ZHANG Yanbing. Sound absorption performance of composite grid sandwich structure with local resonance element[J]. JOURNAL OF VIBRATION AND SHOCK, 2022, 41(7): 291-296.

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http://jvs.sjtu.edu.cn/EN/ OR http://jvs.sjtu.edu.cn/EN/Y2022/V41/I7/291

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