Metamaterials and their applications: An overview

Valipour, Ali; Kargozarfard, Mohammad Hassan; Rakhshi, Mina; Yaghootian, Amin; Sedighi, Hamid M.

doi:10.1177/1464420721995858

Cited by 52 publications

(31 citation statements)

References 73 publications

(207 reference statements)

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“…The metastructure can realize artificial properties such as negative mass and modulus, wave focusing and steering, elastic mirrors, or tunable bandgaps. 14 Based on the local resonance or Bragg scattering, the metastructure can form a shielding frequency band, which is referred to as a bandgap. Compared with the Bragg scattering metastructure, the locally resonant (LR) metastructure is more suited to attenuate low-frequency vibration, which occurs in vehicles 1,2 or machinery 3 in the range of several tens to several hundreds of Hertz, because it allows the absorption of a vibrational wave whose wavelength is much larger than the lattice constant of the periodic structure.…”

Section: Introductionmentioning

confidence: 99%

Modal analysis and demonstration of metastructure combining local resonators and an autonomous synchronized switch damping circuit

Asanuma

Yamauchi

2022

Journal of Low Frequency Noise, Vibration and Active Control

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A locally resonant metastructure is a promising approach for low-frequency vibration attenuation, whereas the attachment of many resonators results in unnecessary and multiple resonance outside the bandgap. To address this issue, we propose a damping metastructure combining local resonators and an autonomous synchronized switch damping circuit. On the basis of modal analysis, we derive an electromechanically coupled equation of the proposed metastructure. The piezo ceramics, which are attached on a small portion of the metastructure and connected to the circuit, remarkably decrease the magnitude of the resonant vibration with no extra sensors, signal processors, or power sources. The displacement at unnecessary resonance was decreased by approximately 75%. The results of the coupled analysis were similar to the experimentally observed results in terms of the location and width of the bandgap on the frequency axis and the decreased displacement for the circuit. The proposed technique can overcome the disadvantage of the metastructure.

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Section: Introductionmentioning

confidence: 99%

Modal analysis and demonstration of metastructure combining local resonators and an autonomous synchronized switch damping circuit

Asanuma

Yamauchi

2022

Journal of Low Frequency Noise, Vibration and Active Control

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“…During the last few decades, researchers have been exploiting various potential applications of metamaterials [1][2] . Metamaterials refer to some composite materials that have artificially designed structures and exhibit extraordinary physical properties that the source materials do not have.…”

Section: Introductionmentioning

confidence: 99%

On band gaps of nonlocal acoustic lattice metamaterials: a robust strain gradient model

Wang

Liu

Soh

et al. 2022

Appl. Math. Mech.-Engl. Ed.

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We have proposed an “exact” strain gradient (SG) continuum model to properly predict the dispersive characteristics of diatomic lattice metamaterials with local and nonlocal interactions. The key enhancement is proposing a wavelength-dependent Taylor expansion to obtain a satisfactory accuracy when the wavelength gets close to the lattice spacing. Such a wavelength-dependent Taylor expansion is applied to the displacement field of the diatomic lattice, resulting in a novel SG model. For various kinds of diatomic lattices, the dispersion diagrams given by the proposed SG model always agree well with those given by the discrete model throughout the first Brillouin zone, manifesting the robustness of the present model. Based on this SG model, we have conducted the following discussions. (I) Both mass and stiffness ratios affect the band gap structures of diatomic lattice metamaterials, which is very helpful for the design of metamaterials. (II) The increase in the SG order can enhance the model performance if the modified Taylor expansion is adopted. Without doing so, the higher-order continuum model can suffer from a stronger instability issue and does not necessarily have a better accuracy. The proposed SG continuum model with the eighth-order truncation is found to be enough to capture the dispersion behaviors all over the first Brillouin zone. (III) The effects of the nonlocal interactions are analyzed. The nonlocal interactions reduce the workable range of the well-known long-wave approximation, causing more local extrema in the dispersive diagrams. The present model can serve as a satisfactory continuum theory when the wavelength gets close to the lattice spacing, i.e., when the long-wave approximation is no longer valid. For the convenience of band gap designs, we have also provided the design space from which one can easily obtain the proper mass and stiffness ratios corresponding to a requested band gap width.

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“…A comprehensive overview of materials and their applications was published by [6] while [7] explored metamaterials for vibration control. Local resonators (LR) is based on the concept of mechanical dynamic vibration absorbers (DVAs) [1,8].…”

Section: Introductionmentioning

confidence: 99%

Multi-Frequency Broadband Vibration Mitigation of a Beam Under Tensile Load

Machado

Dutkiewicz

2022

Preprint

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The vibration characterization is directly associated with the system’s physical properties, such as mass, damping, and stiffness. For over a century, vibration resonator or dynamic absorber has been used for vibration control and mitigation in many sectors of engineering. A limitation of this device is that it acts as a notch filter, which is only effective over a narrow band of frequencies. Therefore, researchers have designed the call metamaterial, which in this case, targets the improvement of vibration attenuation and induces locally resonant bandgaps. This work investigates the broadband vibration mitigation of a beam under tensile load with periodically attached dynamic absorbers. The study uses the modal analysis approach, a simple formulation that only depends on the resonator target frequency and total mass ratio to investigate single and multiple-frequency bandgap formation. Metamaterial and rainbow metamaterial beam under tensile load are employed to widen the gap. In practical designs, a finite number of resonators is required for the open bandgap, and this ideal number is explored in the paper. Additionally, a tensiled beam (cable) virtual twin is built from a physical system to forecast its broadband vibration mitigation with the metamaterial approach. Numerical investigations are conducted regarding the effects of mass ratio and the ideal mass ratio on the open and on the gap convergence, as well as resonators in single and multiple arrangements inducing multiple gaps.

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Metamaterials and their applications: An overview

Cited by 52 publications

References 73 publications

Modal analysis and demonstration of metastructure combining local resonators and an autonomous synchronized switch damping circuit

Modal analysis and demonstration of metastructure combining local resonators and an autonomous synchronized switch damping circuit

On band gaps of nonlocal acoustic lattice metamaterials: a robust strain gradient model

Multi-Frequency Broadband Vibration Mitigation of a Beam Under Tensile Load

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