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Interfacial wave between acoustic media with Willis coupling.

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Bibliographic Details
Title:	Interfacial wave between acoustic media with Willis coupling.
Authors:	Li, Zhanyu¹ (AUTHOR), Qu, Hongfei¹ (AUTHOR), Zhang, Hongkuan¹ (AUTHOR), Liu, Xiaoning¹ (AUTHOR), Hu, Gengkai¹ (AUTHOR) hugeng@bit.edu.cn
Source:	Wave Motion. Jun2022, Vol. 112, pN.PAG-N.PAG. 1p.
Subjects:	Surface waves (Fluids), Sound waves, Acoustical materials, Acoustic wave propagation, Sound design
Abstract:	Acoustic Willis materials, also known as acoustic bianisotropic materials, exhibit unconventional coupling between pressure and velocity, as well as momentum and strain, which have been shown to enable extraordinary control over the propagation of acoustic waves. Our work first predicts that, under proper conditions, interfacial mode can exist at the interface between two acoustic Willis materials, and the existence of the interfacial wave strongly relies on relative orientations of the Willis coupling vectors of the two materials. To demonstrate our theory, experiments are also conducted utilizing a well-designed adjustable acoustic Willis metamaterial. Our experimental results are in good agreement with simulation and theoretical analysis, although there is unavoidable acoustic attenuation in experiments due to damping effect. This work presents a new functional design with acoustic Willis materials and opens a new route to control acoustic waves. • Theory and experiment of interfacial wave between acoustic Willis media. • The conditions for the existence of interfacial wave are given. • An adjustable acoustic Willis metamaterial is designed and fabricated. • This novel functional design opens a new route to control acoustic waves. [ABSTRACT FROM AUTHOR]
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Database:	Engineering Source

Description
Abstract:	Acoustic Willis materials, also known as acoustic bianisotropic materials, exhibit unconventional coupling between pressure and velocity, as well as momentum and strain, which have been shown to enable extraordinary control over the propagation of acoustic waves. Our work first predicts that, under proper conditions, interfacial mode can exist at the interface between two acoustic Willis materials, and the existence of the interfacial wave strongly relies on relative orientations of the Willis coupling vectors of the two materials. To demonstrate our theory, experiments are also conducted utilizing a well-designed adjustable acoustic Willis metamaterial. Our experimental results are in good agreement with simulation and theoretical analysis, although there is unavoidable acoustic attenuation in experiments due to damping effect. This work presents a new functional design with acoustic Willis materials and opens a new route to control acoustic waves. • Theory and experiment of interfacial wave between acoustic Willis media. • The conditions for the existence of interfacial wave are given. • An adjustable acoustic Willis metamaterial is designed and fabricated. • This novel functional design opens a new route to control acoustic waves. [ABSTRACT FROM AUTHOR]
ISSN:	01652125
DOI:	10.1016/j.wavemoti.2022.102922