Actively controllable flexural wave band gaps in beam-type acoustic metamaterials with shunted piezoelectric patches

Zhou, Weijian; Muhammad, .; Chen, Weiqiu; Chen, Zhenyu; Lim, C.W.

doi:10.1016/j.euromechsol.2019.103807

Cited by 117 publications

(32 citation statements)

References 67 publications

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“…This is because variation of environmental factors, i.e. environmental temperature [37], mechanical loading [38][39][40], external electric [41][42][43] and magnetic [44] fields, etc., may change the properties of these phononic TIs, and thus make their true working frequency shift out of the designed working range. Consequently, to make these TIs robust against perturbations of environmental conditions, we need to broaden their working frequency ranges, or to make these TIs respond automatically against environmental change to remain in their true working frequency range.…”

Section: List Of Symbolsmentioning

confidence: 99%

Actively controllable topological phase transition in phononic beam systems

Zhou

Chen

Destrade

et al. 2020

International Journal of Mechanical Sciences

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Topological insulators, which allow edge or interface waves but forbid bulk waves, have revolutionized our scientific cognition of acoustic/elastic systems. Due to their nontrivial topological characteristics, edge (interface) waves are topologically protected against defects and disorders. This superior and unique characteristic could lead to a wealth of new opportunities in applications of quantum and acoustic/elastic information processing. However, current acoustic/elastic topological insulators are still at an infancy stage where the theory and prediction only work in laboratories and there are still many problems left open before promoting their practical applications. One of the apparent disadvantages is their narrow working frequency range, which is the main concern in this paper. We design a one-dimensional phononic beam system made of a homogeneous epoxy central beam sandwiched by two homogeneous piezoelectric beams, and covered with extremely thin electrodes, periodically and separately placed. These electrodes are connected to external electric circuits with negative capacitors. We show that a topological phase transition can be induced and tuned by changing the values of the negative capacitors. It follows that the working frequency of the topologically protected interface mode can be widely changed, such that the working frequency range of the topological insulator can be considerably 'broadened'. This intelligent topological device may also find wide applications in intelligent technologies that need controllable information processing of high precision.

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Section: List Of Symbolsmentioning

confidence: 99%

Actively controllable topological phase transition in phononic beam systems

Zhou

Chen

Destrade

et al. 2020

International Journal of Mechanical Sciences

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“…The band structure presented above is obtained from COMSOL Multiphysics® where the Floquet-Bloch periodicity condition is applied on all edges of cylindrical mass that made the structure infinitely periodic in the x-y-z directions. Some reported studies 14,15,20,27,29 indicate one possible way to visualize the vibration mitigation capability from the proposed metastructures is to build a finite array of unit cells and to perform a frequency response study.…”

Section: Frequency Response Spectrummentioning

confidence: 99%

“…Although waveguiding 3 , focusing and collimation 4 , negative refraction 5 ,topological properties [6][7][8] and underwater acoustic applications [9][10][11] have been explored, the multi-directional vibration control with extremely wide complete BG is also intriguing. Multiple approaches including single material 12,13 and elastic impedance based multi-materials periodic structures by active 14 and passive [15][16][17] control techniques have been proposed to enlarge the BGs. Among those approaches the recently emerging 3D phononic structures with complete 3D BG [18][19][20] , inertial amplification phenomena 12 , actively controlled piezo-patches technique 14,21,22 , elastic metamaterials with dissipative medium characteristics 16 and multi-resonant trampoline metamaterials 15 with trampoline effect 23 Table 1 shows a brief summary for the widest BG reported to date.…”

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Ultrawide 3D Phononic Bandgap Metastructures as Broadband Low Frequency Filter

Muhammad

Lim

2020

Preprint

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This present study reports a novel model for the study on three-dimensional phononic metastructures endued with ultrawide three-dimensional complete bandgaps. The phononic structure is made of a unique material without composite material composition. Based on the principal of mode separation and global and local modal masses participation, the well-engineered structural configurations give extremely wide bandgaps with the gap-to-mid gap ratio of 157.6% and 160.1% for two proposed prototypes that produce the widest three-dimensional bandgaps ever reported. The band structures are explained by a modal analysis and the findings are further corroborated by developing an analytical model based on monoatomic mass-spring chain and further verified with well-established FEM numerical simulations. Thanks to additive manufacturing, the prototypes are developed by using 3D printing technology and low amplitude vibration test is performed to access the real-time vibration mitigation characteristics. An excellent agreement is obtained between analytical, numerical and experimental results. The effects of material damping on transmission response is also taken into consideration that eventually merge the separated bandgaps to form a broadband vibration attenuation zone. The results reported are scale independent and the proposed strategy may pave the way for developing novel meta-devices to control the noise and vibration, and underwater acoustic waves at a wide frequency band in all directions.

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“…One novel locally resonant meta-beam was proposed by Xiao et al 37 employing periodic arrays of beamlike resonators attached to a base beam, obtaining local resonant and Bragg band gaps. Inspired by the former model 37,38 , Zhou et al 39 utilized the piezoelectrical shunt circuit to control the stiffness of the beam-like resonator to tune the local resonant bandgap at a very low frequency region, which can reduce the attached mass, whilst keeping the integrity of the original structure.…”

Section: Introductionmentioning

confidence: 99%

Tuning of subwavelength topological interface states in locally resonant metastructures with shunted piezoelectric patches

Liu

Fang

Liang

et al. 2021

Journal of Applied Physics

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We investigate the propagation behavior of the low-frequency topological interface state of the flexural wave in the locally resonant metastructure and analyze the tunability of the sub-wavelength interface states by the piezoelectric shunting circuit. One homogeneous thin beam is periodically attached with local resonant beams, which connect shunted piezoelectric actuators. The folding band obtained by merging two primitive unit cells into one new element can generate a Dirac point below the low-frequency locally resonant bandgap. This folding point is opened to develop one new bandgap originated from the Bragg scattering effect by breaking the mirror symmetry. Then, topological transitions are demonstrated during the distance variation between two adjacent resonances. The interface state's existence is further confirmed by using steady and transient analysis of the heterostructure, composed of two media with different topological properties. Finally, we show the relationship between the interface frequency and the capacitance ratio and research the influence of the distance parameter on the topological interface state. Because of the tunability of elastic waves by the piezoelectric shunting circuit, our design has potential for applications such as energy harvesters, filters, and physical switches.

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Actively controllable flexural wave band gaps in beam-type acoustic metamaterials with shunted piezoelectric patches

Cited by 117 publications

References 67 publications

Actively controllable topological phase transition in phononic beam systems

Actively controllable topological phase transition in phononic beam systems

Ultrawide 3D Phononic Bandgap Metastructures as Broadband Low Frequency Filter

Tuning of subwavelength topological interface states in locally resonant metastructures with shunted piezoelectric patches

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