Active feedback control of elastic wave metamaterials

Wang, Yi–Ze; Li, Fengming; Wang, Yue-Sheng

doi:10.1177/1045389x16682851

Cited by 47 publications

(11 citation statements)

References 25 publications

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“…On the other hand, some investigations have been reported on the phononic crystals and elastic wave metamaterials with the active control action [33][34][35][36][37] . To present the controllable flexural waves with the broadband characteristics by the active control, an experiment using the shunted piezoelectric patches was reported 38 .…”

Section: Active Control On Topological Immunity Of Elastic Wave Metammentioning

confidence: 99%

Active control on topological immunity of elastic wave metamaterials

Wang

et al. 2020

Sci Rep

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The topology concept in the condensed physics and acoustics is introduced into the elastic wave metamaterial plate, which can show the topological property of the flexural wave. The elastic wave metamaterial plate consists of the hexagonal array which is connected by the piezoelectric shunting circuits. The Dirac point is found by adjusting the size of the unit cell and numerical simulations are illustrated to show the topological immunity. Then the closing and breaking of the Dirac point can be generated by the negative capacitance circuits. These investigations denote that the topological immunity can be achieved for flexural wave in mechanical metamaterial plate. The experiments with the active control action are finally carried out to support the numerical design.

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Section: Active Control On Topological Immunity Of Elastic Wave Metammentioning

confidence: 99%

Active control on topological immunity of elastic wave metamaterials

Wang

et al. 2020

Sci Rep

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“…It is generally acknowledged that the active and passive feedback controls can modulate the vibration and elastic wave propagation by changing the control actions [35][36][37][38][39]. Chen et al [40] studied an adaptive metamaterial beam with hybrid shunting circuits.…”

Section: Introductionmentioning

confidence: 99%

“…It was illustrated that the equivalent mechanical impedance can be tuned without changing elastic structures. Owning the abilities to receive external information and make timely response, the active feedback control action has superior characteristics and engineering applications [38].…”

Section: Introductionmentioning

confidence: 99%

Sound Transmission Comparisons of Active Elastic Wave Metamaterial Immersed in External Mean Flow

Wang

2021

Acta Mech. Solida Sin.

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Using the active feedback control system on the elastic wave metamaterial, this research concentrates on the sound transmission with the dynamic effective model. The metamaterial is subjected to an incident pressure and immersed in the external mean flow. The elastic wave metamaterial consists of double plates and the upper and lower four-link mechanisms are attached inside. The vertical resonator is attached by the active feedback control system and connected with two four-link mechanisms. Based on the dynamic equivalent method, the metamaterial is equivalent as a single-layer plate by the dynamic effective parameter. With the coupling between the fluid and structure, the expression of the sound transmission loss (STL) is derived. This research shows the influence of effective mass density on sound transmission properties, and the STL in both modes can be tuned by the acceleration and displacement feedback constants. In addition, the dynamic response and the STL are also changed obviously by different values of structural damping, incident angle (i.e., the elevation and azimuth angles) and Mach number of the external fluid with the mean flow property. The results for sound transmission by two methods are compared, i.e., the virtual work principle for double plates and the dynamic equivalent method corresponding to a single one. This paper is expected to be helpful for understanding the sound transmission properties of both pure single- and double-plate models.

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“…For example, the digital circuit could be programmed to mimic a negative capacitance to control the effective Young's modulus. Direct feedback control is another active way to tune the structural properties, which has already been used to realize effective negative mass [20], or add a positive active stiffness into the system [21].…”

Section: Introductionmentioning

confidence: 99%

Active metamaterials with broadband controllable stiffness for tunable band gaps and non-reciprocal wave propagation

Ouisse

Sadoulet-Reboul

et al. 2019

Smart Mater. Struct.

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One dimensional active metamaterials with broadband controllable bending stiffness are studied in this paper. The key unit of the active metamaterials is composed of a host beam and piezoelectric patches bonded on the beam surfaces. These patches serve as sensors or actuators. An appropriate feedback control law is proposed in order to change the bending stiffness of the active unit. The input of the control law is the voltage on the sensors, the output is the voltage applied on the actuators. Due to the control, bending stiffness of the active unit is (1 + α) times of that of the bare host beam, α being a design parameter in the control law. The bending stiffness can be tuned to desired value by changing α. The performances of the controlled bending stiffness are analytically and numerically studied, the stability issues are also discussed. The active units are first used in a spatial periodic waveguide to have tunable band gaps, then they are integrated in a spatiotemporal periodic waveguide to realize non-reciprocal wave propagation. Performances of the two waveguides are numerically studied.

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Active feedback control of elastic wave metamaterials

Cited by 47 publications

References 25 publications

Active control on topological immunity of elastic wave metamaterials

Active control on topological immunity of elastic wave metamaterials

Sound Transmission Comparisons of Active Elastic Wave Metamaterial Immersed in External Mean Flow

Active metamaterials with broadband controllable stiffness for tunable band gaps and non-reciprocal wave propagation

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