阻抗和厚度梯度变化准周期结构水下声学特性研究

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振动与冲击 ›› 2023, Vol. 42 ›› Issue (4) : 212-218.

论文

杜逸眉1，胡博1,2,3，李明杰1，时胜国1,2,3，时洁1,2,3

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

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

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文章历史 +

摘要

周期结构在减振降噪、滤波等方面具有很大的应用潜力。功能梯度材料是近年出现的具有优良性能的新型复合材料。为了满足水下低频宽带应用的要求，本文将周期结构和功能梯度材料相结合，提出了厚度和阻抗梯度变化的准周期结构。利用传递矩阵法，对厚度和阻抗梯度变化的准周期结构进行了反射系数的仿真，与周期结构带隙特性进行了比较，分析了厚度与阻抗对准周期结构带隙的影响，最后根据仿真结果制备了实验样品，进行了水下验证实验。研究结果表面：厚度和阻抗梯度变化的准周期结构，第一带隙具有更低的起始频率与更高的截止频率，阻抗梯度变化对准周期结构带隙特性的影响大于厚度梯度变化。这些结果可以为利用准周期结构实现水下低频宽带的减振降噪提供参考。

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.

导出引用

杜逸眉1，胡博1,2,3，李明杰1，时胜国1,2,3，时洁1,2,3. 阻抗和厚度梯度变化准周期结构水下声学特性研究[J]. 振动与冲击, 2023, 42(4): 212-218

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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