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

机译：用于最佳弯曲波吸收和粘附的有源元层

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摘要

Flexural wave propagation is common in thin structures and plays a key role in vibrations of structures. Designs of flexural wave absorbers for vibration control have been constantly pursued for decades aiming to find structures that can best balance tradeoffs between small sizes or lightweights and broadband operations. However, their absorption performance has long been evaluated on a case-by-case basis, and the theoretical limit characterizing the relationship between the absorption spectrum and the sample thickness and mass density is missing. In this study, by adopting an inequality as its electromagnetism and acoustics counterparts, the theoretical limit of flexural wave absorption is established. An active meta-layer composed of piezoelectric sensors and actuators with feedback control loops is proposed for optimal wave absorption. We experimentally demonstrate the active meta-layer for optimal broadband wave and vibration control in the beam and acting as skin cloaks of large voids in the plate. The active meta-layer is electrically programmable and scalable without losing stability. The approach proposed sheds light on designs of reconfigurable dynamic control devices and enables alternative solutions for ultrasonic sensing of complex engineering structures.
机译：弯曲波传播在薄结构中是常见的并且在结构的振动中起着关键作用。抗振动控制的设计已经不断追求几十年来发现能够在小尺寸或轻量级和宽带操作之间平衡折衷的结构。然而，它们的吸收性能已经在逐个案例的基础上进行了评估，并且描述了吸收光谱与样品厚度和质量密度之间的关系的理论极限。在本研究中，通过采用不等式作为其电磁和声学对应物，建立了弯曲波吸收的理论极限。提出了一种由压电传感器和具有反馈控制环路的致动器组成的有源元层，以获得最佳波吸收。我们通过实验证明了用于最佳宽带波和梁中的振动控制的活动元层，并用作板中大空隙的皮肤披风。有源元层可在不失稳定性的情况下电动编程和可伸缩。该方法提出了可重新配置动态控制装置的设计揭示光，并为复杂工程结构的超声波感测替代解决方案。

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