An active meta-layer for optimal flexural wave absorption and cloaking

Li, Xiaopeng; Chen, Yangyang; Zhu, Rui; Huang, Guoliang

doi:10.1016/j.ymssp.2020.107324

Cited by 47 publications

(26 citation statements)

References 45 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…波导是一种能够改变波传播方向的器件。波导大多依赖于缺陷态，但已有的缺陷很难改变其位置、尺寸等等，因而大大限制了波导的应用。而利用分流电路可调特性，可通过分流电路制成电路缺陷，从而便捷的制成任意方向、宽频率的波导。Casadei 等人 [114] 通过将压电片贴在波导内拓宽了波导的工作频率。Chen 等人 [115] 则通过改变压电复合板的电路，在不改变原始弹性板结构的前提下等人 [116] 以及 Alshaqaq 和 Erturk [117] 通过将电路参数沿空间方向梯度分布，进而拓宽带隙；Wu 等人 [118] 通过梯度布置压电复合杆外接电路的电感提高了弯曲波透射率； Li 等人 [119] 通过梯度布置电路参数改变了弯曲波的相位，为后续制作弯曲波超表面提供了理论基础；Xia 等人 [120] 通过梯度布置负电容电路实现了反平面 SH 剪切波的转向和聚焦；Chen 等人 [121,122] 通过梯度布置分流电路的电路参数，提高了弯曲波感应器的灵敏度，实现了弯曲波转向、聚焦透镜和隐身斗篷；Yi 等人 [123,124] 通过在二维弹性板表面周期的粘贴压电片，使用负电容电路改变等效折射率实现了平面透镜； Li 等人 [125] 通过将压电片贴在弹性板的边界上，用于改变弯曲波的传播方向。 Li 等人 [126] 将压电片贴在特定的边界上，如图 7(a)和 7(b)所示，通过反馈控制算法实现了弯曲波吸收和弯曲波斗篷(见图 7(c)和 7(d)) 。Ning 等人 [127,128] 通过将压电片呈放射状粘贴在弹性基体板表面，如图 7(e)所示，外接控制电路并使其参数按照指定规则由内向外梯度排布，制成了弯曲波黑洞(见图 7(f)) 。图 7.主动弯曲波斗篷、黑洞示意图。 (a)、(b)弯曲波隐身斗篷示意图和实验图 [126] 。(c)、(d)分别为…”

Section: 弹性波波导unclassified

See 1 more Smart Citation

Smart piezoelectric phononic crystals and metamaterials:State-of-the-art review and outlook

Li¹,

Wang²,

Ma³

et al. 2022

Chin. Sci. Bull.

View full text Add to dashboard Cite

As artificially designed novel periodic materials and structures, phononic crystals (PCs) and acoustic/ elastic metamaterials (AMs) have many unique and extraordinary wave propagation characteristics, which provide a novel research pathway and a promising application opportunity for the efficient vibration control and precise elastic wave manipulation. However, the conventional PCs/AMs after their design and fabrication can be hardly modified with respect to their geometrical and material parameters in order to meet the actual demands, which significantly restricts their practical applications. Smart piezoelectric PCs/AMs based on the piezoelectric or electro-mechanical coupling effect can be utilized to manipulate their vibration or elastic wave propagation properties on demand by controlling the electrical field. This feature can significantly broaden the practical application ranges of the conventional PCs/AMs. This paper first classifies the smart piezoelectric PCs/AMs according to the different combination forms of the piezoelectric and elastic materials or structures roughly into three types. The first type is the unitary or monotype piezoelectric PCs/AMs, which only contain a single piezoelectric material without or with electrodes. The second type is the embedded or infill piezoelectric PCs/AMs in which the piezoelectric scatterers are embedded into an elastic matrix or vice versa. The third type is the externally bonded piezoelectric composite PCs/AMs which consist of the piezoelectric patches attached to the surfaces of an elastic base structure (rod, beam, plate, etc.). Then, based on this classification and according to the dimensional periodicity as well as the tuning method and the tuning target, the state-of-the-art research topics on the different smart piezoelectric PCs/AMs and their potential applications are briefly reviewed.

show abstract

Section: 弹性波波导unclassified

“…The active flexural wave cloak and black hole. (a) Schematic sketch, and (b) experimental setup of the active flexural wave cloak [126] . The displacement fileds (c) with and (d) without the active feedback control.…”

Section: A C C E P T E Dmentioning

confidence: 99%

Smart piezoelectric phononic crystals and metamaterials:State-of-the-art review and outlook

Li¹,

Wang²,

Ma³

et al. 2022

Chin. Sci. Bull.

View full text Add to dashboard Cite

show abstract

“…P. Packo et al also proposed a grating structure to achieve anomalous reflection and refraction of flexural waves [34]. Although there are many interesting studies on the modulation of Lamb or SH waves in thin plates with metasurfaces or gratings [35][36][37][38][39][40][41][42][43][44][45][46][47][48][49][50], in numerous application fields such as non-destructive assessment and structural health monitoring, the complete and simultaneous control of bulk longitudinal and transverse waves are highly desired. In this regard, people utilized plate-like waveguide structures to split the p-wave from SV-wave [51] and achieve abnormal refraction of the SV-wave [52] or used a topology optimization method to obtain anomalous reflection [53] or refraction [54] of a longitudinal wave.…”

Section: Introductionmentioning

confidence: 99%

Elastic Metagratings with Simultaneous Modulation of Reflected and Transmitted Waves

2022

View full text Add to dashboard Cite

Elastic metagratings enabling independent and complete control of both reflection and transmission of bulk longitudinal and transverse waves are highly desired in application scenarios such as non-destructive assessment and structural health monitoring. In this work, we propose a kind of simply structured metagrating composed only of elliptical hollow cylinders carved periodically in a steel background. By utilizing the grating diffraction theory and genetic algorithm, we endow these metagratings with the attractive functionality of simultaneous and high-efficiency modulation of every reflection and transmission channel of both longitudinal and transverse waves. Interesting wave-front manipulation effects including pure mode conversion and anomalous deflection along the desired direction are clearly demonstrated through full-wave numerical simulations. Due to its subwavelength thickness and high manipulation efficiency, the proposed metagrating is expected to be useful in the design of multifunctional elastic planar devices.

show abstract

“…However, these researches are only focused on numerical simulation, and there is still a lack of the corresponding experimental study for the tunable EP and UZR based on piezoelectric metamaterials. The EP not only can be used for the UZR but also can achieve the unidirectional perfect absorption (UPA), which provides convenience for designing dynamic control devices [27]. To obtain the UPA, Li et al [28] constructed an asymmetrical metabeam with a pair of loss-induced asymmetrical resonators to find the EP and the critical coupling condition for extremely asymmetric flexural wave absorption based on the intrinsic viscosity loss.…”

Section: Introductionmentioning

confidence: 99%

Versatile non-Hermitian piezoelectric metamaterial beam with tunable asymmetric reflections

Xia

et al. 2022

Front. Phys.

View full text Add to dashboard Cite

Non-Hermitian systems have been widely utilized to achieve specific functions for manipulating abnormal wave motion, such as asymmetric mode switching, unidirectional zero reflection (UZR), and unidirectional perfect absorption (UPA). In this paper, a novel non-Hermitian piezoelectric metamaterial beam is proposed to realize the tunable UZR of flexural waves. The unit cell of this non-Hermitian metamaterial beam consists of a host beam and two pairs of piezoelectric patches shunting different resistor–inductor circuits. Based on the flexural wave theory, the transfer matrix method is introduced to analyze the influence of electrical boundary conditions on the UZR and further clarify the relationship between the UZR and the exceptional point. The exceptional point depends only on the dissipative circuit, and it has no need for the balanced gain and loss like parity–time symmetric metamaterial. Furthermore, the UZR for the desired frequency is realized by applying a genetic algorithm, and its effectivity is experimentally validated. In addition, the non-Hermitian metamaterial beam is designed to realize the UPA of flexural waves. Results indicate that the proposed metamaterial beam is versatile and can achieve tunable manipulations of asymmetric wave propagations and has widely promising applications in many fields, such as non-destructive testing, enhanced sensing, wave isolation and vibration attenuation.

show abstract

An active meta-layer for optimal flexural wave absorption and cloaking

Cited by 47 publications

References 45 publications

Smart piezoelectric phononic crystals and metamaterials:State-of-the-art review and outlook

Smart piezoelectric phononic crystals and metamaterials:State-of-the-art review and outlook

Elastic Metagratings with Simultaneous Modulation of Reflected and Transmitted Waves

Versatile non-Hermitian piezoelectric metamaterial beam with tunable asymmetric reflections

Contact Info

Product

Resources

About