A study on underwater acoustic characteristics of quasi-periodic structure based on gradient change of impedance and thickness
DU Yimei1,HU Bo1,2,3,LI Mingjie1,SHI Shengguo1,2,3,SHI Jie1,2,3
1.College of Underwater Acoustic Engineering, Harbin Engineering University, Harbin 150001, China;
2.Acoustic Science and Technology Laboratory, Harbin Engineering University, Harbin 150001, China;
3.Key Laboratory of Marine Information Acquisition and Security, Ministry of Industry and Information Technology, Harbin Engineering University, Harbin 150001, China
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.
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 Bo1,2,3,LI Mingjie1,SHI Shengguo1,2,3,SHI Jie1,2,3. A study on underwater acoustic characteristics of quasi-periodic structure based on gradient change of impedance and thickness. JOURNAL OF VIBRATION AND SHOCK, 2023, 42(4): 212-218.
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