Elastic wave manipulation in piezoelectric beam meta-structure using electronic negative capacitance dual-adjacent/staggered connections
Elastic wave manipulation in piezoelectric beam meta-structure using electronic negative capacitance dual-adjacent/staggered connections
复制标题
DOI：
10.1016/j.compstruct.2018.11.053
复制
发表时间：
2019-02
影响因子：
6.3
通讯作者：
Bin Bao;Quan Wang
中科院分区：
文献类型：
--
作者：
Bin Bao;Quan Wang
压电超结构中的波传播控制是近年来发展起来的一个研究领域，其研究重点是通过压电材料耦合适当的电介质，以实现低频范围内的弹性波滤波。为了开发宽带带隙和多样化的波传播特性的机械元结构，以不同的复杂的实际应用，研究提出了一种创新的压电梁元结构，使用电子负电容双相邻/交错电连接。在所提出的元结构中，由四个相邻的原始周期单元（包括四个具有不同极化方向的压电片）组成的单位周期单元使用电双相邻/交错模式连接到负电容电路分流器。基于梁理论和波传播理论，建立了该元结构的理论模型，用于评估波的传播特性。此外，该结构的波衰减性能进行了研究，并与传统的元结构与负电容独立的电子网络，其中负电容分流独立地施加到单个压电片或双压电晶片压电片在一个单位的原始周期细胞。结果表明，所提出的新型超元结构利用较少的负电容分流器实现了更好的消波性能，在实际应用中具有更稳定的负电容控制系统。
Wave propagation control in piezoelectric meta-structures has been developed in recent years, which focuses on coupling proper electric media via piezoelectric materials for elastic wave filtering properties within a low frequency range. In order to develop broadband band gaps and diversified wave propagation characteristics of mechanical meta-structures for different complex practical applications, the research proposes an innovative piezoelectric beam meta-structure using electronic negative capacitance dual-adjacent/staggered electrical connections. In the proposed meta-structures, a unit periodic cell composed of four adjacent primitive periodic cells (including four piezoelectric patches with different polarization directions) are connected to negative capacitance circuit shunts using electrical dual-adjacent/staggered patterns. Based on the Timoshenko beam theory and wave propagation theory, a theoretical modeling of the proposed meta-structure is established for evaluating wave propagation properties. Furthermore, wave attenuation performance of the proposed structure is investigated and compared with the traditional meta-structure with negative capacitance independent electronic networks in which negative capacitance shunts are independently applied to single piezoelectric patch or bimorph piezoelectric patches within a unit primitive periodic cell. Results show that the proposed innovative meta-structure utilizes less negative capacitance shunts for achieving better wave attenuation performance, and has more stable negative capacitance control system in practical applications.