Visco-thermal Effects on Anisotropic and Isotropic Labyrinthine Acoustic Metamaterials in the Cascade

作者全名："Zhou, Yufeng"

作者地址："[Zhou, Yufeng] Chongqing Med Univ, Coll Biomed Engn, State Key Lab Ultrasound Med & Engn, Chongqing Key Lab Biomed Engn, Chongqing 400016, Peoples R China"

通信作者："Zhou, YF (通讯作者)，Chongqing Med Univ, Coll Biomed Engn, State Key Lab Ultrasound Med & Engn, Chongqing Key Lab Biomed Engn, Chongqing 400016, Peoples R China."

来源：JOURNAL OF VIBRATION ENGINEERING & TECHNOLOGIES

ESI学科分类：ENGINEERING

WOS号：WOS:000909468900001

JCR分区：Q2

影响因子：2.7

年份：2024

卷号：12

期号：1

开始页：223

结束页：232

文献类型：Article

关键词：Labyrinthine acoustic metamaterials; Visco-thermal effects; Power transmission; Space coiling; Cascade connection

摘要："Purpose Labyrinthine acoustic metamaterials (AMs) by coiling up space through curled or zigzag channels in the thickness of sub-wavelength have shown extraordinary performance in pressure acoustics. Visco-thermal effects become significant in the small space but are not considered in the labyrinthine AMs. Furthermore, the acoustic performance of identical labyrinthine or space-coiling AM units in the cascade in comparison with those of a single one is unknown.Methods Visco-thermal effects in the acoustic and structural properties (i.e., power transmission, effective acoustic impedance, relative effective refractive index, stress, and displacement) of the cascaded anisotropic spiral or isotropic zigzag AM units are simulated using finite element method (FEM) and compared with those of single unit. The effect of the gap distance between two AM units in the cascade on acoustic performances is studied.Results It is found that visco-thermal effects in the coiling-up space results in significant transmission losses and suppression of negative-index behavior, anisotropic and isotropic AMs are significantly different in acoustics, and acoustic performance of AM units in the cascade with an appropriate separating distance cannot be extrapolated simply from that of a single unit. The transmission loss of two isotropic zigzag AM units in the cascade (i.e., 6.1 x 10(-5)) is even larger than the squared value of a single one (i.e., 0.144), which may be an effective acoustic absorption design.Conclusions Separating distance between units and visco-thermal effects in the sub-wavelength coiling-up space have a significant impact on the acoustic properties of labyrinthine AM units in the cascade. Further investigation not only contributes to understanding the underlying physics but also illustrates an application potential, such as lightweight acoustic barriers with significant acoustic absorption."

基金机构：　

基金资助正文：