基于梯度流固超晶格的宽频透声结构设计

doi:10.16180/j.cnki.issn1007-7820.2023.09.009

摘要/Abstract

摘要：

为了弱化周期性流固超晶格结构通带内的吉布斯振荡,文中将结构梯度引入流固超晶格结构设计中,设计了固体层占空比呈对称线性分布的梯度流固超晶格结构(Gradient Fluid-solid Superlattice,GFSL)。基于传递矩阵方法,对GFSL结构的声传输特性进行了计算与研究。在此基础上,讨论了不同梯度参量对GFSL结构透声特性的影响,以实现对通带性能的调控,并通过有限元方法从频域和时域两个角度验证了GFSL结构的声传输特性。研究结果表明,GFSL结构能够有效消除吉布斯振荡,形成平坦的宽频通带。所提出的GFSL结构在水下高强度的超声波能量集中、声阻抗匹配及滤波等方面具有潜在的应用价值。

关键词: 超声波, 流固超晶格, 吉布斯振荡, 梯度, 传递矩阵, 有限元, 宽频, 滤波

Abstract:

In order to weaken the Gibbs oscillation in the passband of periodic fluid-solid superlattice structure, a gradient fluid-solid superlattice structure (GFSL) with symmetrical linear distribution of solid layer filling fraction is designed by introducing structural gradient. Based on the transfer matrix method, the acoustic transmission characteristics of GFSL structure are calculated. On this basis, the effects of different gradient parameters on the sound transmission characteristics of GFSL structure are discussed to adjust the passband performance. The sound transmission characteristics of GFSL structure are verified from the perspectives of frequency domain and time domain by finite element method. The results show that the GFSL structure effectively eliminates the Gibbs oscillation and forms a flat broadband passband. The proposed GFSL structure has potential application value in underwater high-intensity ultrasonic energy concentration, acoustic impedance matching and filtering.

Key words: ultrasonic, fluid-solid superlattice, Gibbs oscillation, gradient, transfer matrix, finite element, broadband, wave filtering

中图分类号:

TN03

张利娟,张赛,沈佳敏,顾鑫. 基于梯度流固超晶格的宽频透声结构设计[J]. 电子科技, 2023, 36(9): 58-65.

ZHANG Lijuan,ZHANG Sai,SHEN Jiamin,GU Xin. Design of Broadband Sound Transmission Structure Based on Gradient Fluid-Solid Superlattice[J]. Electronic Science and Technology, 2023, 36(9): 58-65.

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