A study on underwater acoustic characteristics of quasi-periodic structure based on gradient change of impedance and thickness

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Journal of Vibration and Shock ›› 2023, Vol. 42 ›› Issue (4) : 212-218.

DU Yimei1,HU Bo1,2,3,LI Mingjie1,SHI Shengguo1,2,3,SHI Jie1,2,3

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Abstract

Periodic structure has great application potential in vibration and noise reduction, filtering, etc. Functionally graded materials (FGMs) are novel composite materials with excellent properties in recent years. This paper combines periodic structure with functionally graded materials, and proposes a quasi-periodic structure with gradient changes of thickness and impedance to meet the requirements of underwater low-frequency broadband applications. Firstly, the reflection coefficient of the quasi-periodic structure with gradient change of thickness and impedance is simulated using the transfer matrix method. The band gap characteristics of the quasi-periodic structure and the periodic structure are compared, and the influence of thickness and impedance on the band gap of the quasi-periodic structure is analyzed. Finally, experimental samples were prepared and underwater verification experiments were carried out. The results show that the first band gap of the quasi-periodic structure with gradient change of thickness and impedance has a lower starting frequency and a higher cutoff frequency. The impedance gradient change has greater effect than the thickness gradient change on the band gap characteristics of the quasi-periodic structure. These results can provide reference for quasi-periodic structure application on vibration and noise reduction of underwater low-frequency broadband.

Key words

impedance / gradient change / periodic structure / vibration and noise reduction

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DU Yimei1,HU Bo1,2,3,LI Mingjie1,SHI Shengguo1,2,3,SHI Jie1,2,3. A study on underwater acoustic characteristics of quasi-periodic structure based on gradient change of impedance and thickness[J]. Journal of Vibration and Shock, 2023, 42(4): 212-218

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