Tunable modulation of refracted lamb wave front facilitated by adaptive elastic metasurfaces

Li, Shilong; Xu, Jiawen; Tang, Jiong

doi:10.1063/1.5011675

Cited by 67 publications

(38 citation statements)

References 34 publications

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“…Only very recently, this concept was extended for application to elastodynamics [20][21][22][23][24][25][26][27] in order to control the refraction of elastic waves in solid waveguides. In their initial study, Zhu et al 20 explored the behavior of an elastic metasurface in transmission mode and investigated the possibility of controlling the angle of refraction and the shape of an incoming planar wave front.…”

Section: Introductionmentioning

confidence: 99%

Total-internal-reflection elastic metasurfaces: Design and application to structural vibration isolation

Zhu¹,

Walsh

Semperlotti³

2018

Applied Physics Letters

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This letter presents the concept of Total Internal Reflection metasurface (TIR-MS) which supports the realization of structure-embedded subwavelength acoustic shields for elastic waves propagating in thin waveguides. The proposed metasurface design exploits extreme phase gradients, implemented via locally resonant elements, in order to achieve operating conditions that are largely beyond the critical angle. Such artificial discontinuity is capable of producing complete reflection of the incoming waves regardless of the specific angle of incidence. From a practical perspective, the TIR-MS behaves as a sound hard barrier that is impenetrable to long-wavelength modes at a selected frequency. The TIR metasurface concept is first conceived for a flat interface embedded in a rectangular waveguide and designed to block longitudinal S 0 -type guided modes. Then, it is extended to circular plates in order to show how enclosed areas can be effectively shielded by incoming waves. Given the same underlying physics, an equivalent dynamic behavior was also numerically and experimentally illustrated for flexural A 0 -type guided modes. This study shows numerical and experimental evidence that, when the metasurface is excited at the target frequency, significant vibration isolation can be achieved in presence of waves having any arbitrary angle of incidence. These results open interesting paths to achieve vibration isolation and energy filtering in certain prototypical structures of interest for practical engineering applications.

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Section: Introductionmentioning

confidence: 99%

Total-internal-reflection elastic metasurfaces: Design and application to structural vibration isolation

Zhu¹,

Walsh

Semperlotti³

2018

Applied Physics Letters

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“…By using this, a Luneburg and a Maxwell lens were also demonstrated in this study. An adaptive and tunable MS can manipulate elastic waves by using piezoelectric circuit integration without change in the host structure [152]; the proposed elastic MS consists of arrayed piezoelectric devices with individually-connected elements that have negative capacitance. By adjusting the negative capacitances online, discontinuous phase profiles can be obtained.…”

Section: Elastic Metasurfacesmentioning

confidence: 99%

Recent Advances in Non-Traditional Elastic Wave Manipulation by Macroscopic Artificial Structures

2020

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Metamaterials are composed of arrays of subwavelength-sized artificial structures; these architectures give rise to novel characteristics that can be exploited to manipulate electromagnetic waves and acoustic waves. They have been also used to manipulate elastic waves, but such waves have a coupling property, so metamaterials for elastic waves uses a different method than for electromagnetic and acoustic waves. Since researches on this type of metamaterials is sparse, this paper reviews studies that used elastic materials to manipulate elastic waves, and introduces applications using extraordinary characteristics induced by metamaterials. Bragg scattering and local resonances have been exploited to introduce a locally resonant elastic metamaterial, a gradient-index lens, a hyperlens, and elastic cloaking. The principles and applications of metasurfaces that can overcome the disadvantages of bulky elastic metamaterials are discussed.

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“…Piezoelectric materials were also used to achieve tunability. [ 24,25 ] Real‐time tunability was demonstrated using a sophisticated feed‐back control system. [ 25 ]…”

Section: Introductionmentioning

confidence: 99%

Frequency‐Coded Passive Multifunctional Elastic Metasurfaces

Rong

Zhang

et al. 2020

Adv Funct Materials

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As an emerging material, metasurfaces open the door to a wide range of applications based on ultrasonic and elastic waves. However, most of the existing elastic metasurfaces have a fixed functionality and operate at a fixed frequency, which make them difficult to adapt to changing working requirements and/or environments. Although several recently proposed reconfigurable designs can relax this limitation, they either need laborious tuning or complex active control systems. In this work, by encoding multiple functionalities onto a single metasurface through operation frequencies, passive metasurfaces with switchable multifunctionalities are proposed and realized. Different wave manipulation functions of a single metasurface can be switched from one to another simply by changing the operation frequency. The design of these metasurfaces is realized using a systematic design approach based on topology optimization. Frequency-coded multiple elastic wave manipulation functions, including wave beam steering and focusing, are numerically and experimentally demonstrated. Good agreement between the numerical simulations and experimental measurements is achieved. The proposed design strategy significantly enhances the functionalities and adaptivity of metasurfaces, moving them closer towards real-world applications.

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Tunable modulation of refracted lamb wave front facilitated by adaptive elastic metasurfaces

Cited by 67 publications

References 34 publications

Total-internal-reflection elastic metasurfaces: Design and application to structural vibration isolation

Total-internal-reflection elastic metasurfaces: Design and application to structural vibration isolation

Recent Advances in Non-Traditional Elastic Wave Manipulation by Macroscopic Artificial Structures

Frequency‐Coded Passive Multifunctional Elastic Metasurfaces

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