Widely tunable magnetorheological metamaterials with nonlinear amplification mechanism

International Journal of Mechanical Sciences, Journal Year: 2023, Volume and Issue: 264, P. 108830 - 108830

Published: Oct. 18, 2023

Language: Английский

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Bio-inspired non self-similar hierarchical elastic metamaterials

International Journal of Mechanical Sciences, Journal Year: 2022, Volume and Issue: 241, P. 107915 - 107915

Published: Nov. 17, 2022

Hierarchy provides unique opportunities for the design of advanced materials with superior properties that arise from architecture, rather than constitutive material response. Contrary to quasi-static regime, where potential hierarchy has been largely explored, its role in vibration mitigation and wave manipulation remains elusive. So far, majority studies concerning hierarchical elastic metamaterials have proposed a self-similar repetition specific unit cell at multiple scale levels, leading activation same bandgap mechanism different frequencies. On contrary, here, we show by designing non geometries allows us create periodic structures supporting multiple, highly attenuative broadband bandgaps involving (independently or simultaneously) scattering mechanisms, namely, Bragg scattering, local resonance and/or inertial amplification, The type band gap is identified discussed examining vibrational mode shapes imaginary component wavenumber dispersion diagram cell. We also experimentally confirm this performing measurements lowest frequency regime on 3D printed structure. Hierarchical strategies may find application civil, aerospace mechanical engineering.

Language: Английский

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A surface-wave seismic metamaterial filled with auxetic foam

International Journal of Mechanical Sciences, Journal Year: 2023, Volume and Issue: 262, P. 108715 - 108715

Published: Aug. 29, 2023

Language: Английский

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Coupled bandgap properties and wave attenuation in the piezoelectric metamaterial beam on periodic elastic foundation

Applied Mathematical Modelling, Journal Year: 2023, Volume and Issue: 125, P. 293 - 310

Published: Oct. 4, 2023

Language: Английский

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Bandgap merging and backward wave propagation in inertial amplification metamaterials

International Journal of Mechanical Sciences, Journal Year: 2023, Volume and Issue: 250, P. 108319 - 108319

Published: March 15, 2023

Language: Английский

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Low-frequency vibration attenuation of metamaterial sandwich plate with lever-type inertial amplified resonators

Thin-Walled Structures, Journal Year: 2024, Volume and Issue: 199, P. 111827 - 111827

Published: March 24, 2024

Language: Английский

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Metamaterial sandwich plates with two-degree of freedom inertial amplified resonators for broadband low-frequency vibration attenuation

Mechanics of Advanced Materials and Structures, Journal Year: 2024, Volume and Issue: 31(30), P. 12885 - 12897

Published: March 18, 2024

Sandwich plates are extensively utilized across various fields, encompassing building engineering, mechanical and aerospace owing to their exceptional stiffness-to-weight ratio. However, effectively attenuating the low-frequency broadband vibrations of these poses a significant challenge. This paper proposes new type metamaterial sandwich plate that incorporates two-degree freedom inertial amplified resonators (IA-MSPDF2), attain two band gaps (BGs) achieve vibration attenuation. The dispersion relation IA-MSPDF2 is calculated based on Bloch-Floquet theorem, generation mechanism BGs analyzed through eigenmodes. Both numerical experimental studies conducted substantiate advantages associated with presence in design. results show enhanced coupling effect between primary secondary leads local resonance shifts lower frequencies, resulting Bragg scattering BG arises above locally resonant BG. Compared one-degree (IA-MSPDF1) equal mass, exhibits an increased relative bandwidth by 15%. Increasing damping resonator causes attenuation zones widen merge into wider zone. proposed can robustly attenuate small mass cost, contributing further exploration utilization engineering applications.

Language: Английский

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Stochastic bandgap optimization for multiscale elastic metamaterials with manufacturing imperfections

International Journal of Mechanical Sciences, Journal Year: 2024, Volume and Issue: 268, P. 109035 - 109035

Published: Jan. 11, 2024

Bandgaps are endowed to elastic metamaterials (EMMs) attributed the rationally designed unit cells and extensive works devoted bandgap enlargement for improving applicability of EMMs in multi-disciplinary applications. Nonetheless, most existing optimization frameworks neglect manufacturing imperfections, such as microscale heterogeneity system uncertainties, which can significantly affect behaviours. Without properly accounting these effects, design may fail achieve optimal goal, exhibiting consistently ultra-wide wave attenuation bands practical EMMs. Herein, this paper, a stochastic framework is developed involving aiming at optimizing first two statistical moments normalized bandwidth (NB) simultaneously. To alleviate large computational costs approximating moments, surrogate model employed reveal constitutive relationship between parameters NB multiscale EMM. Moreover, solve problem effectively efficiently, high-order mutation strategy proposed develop an improved particle swarm (PSO) variant, namely adaptively mutation-based PSO (AHMPSO). demonstrate viability efficiency framework, numerical investigation implemented on 3D EMM, highlights enlarged bandwidths coupling with improvement robustness optimum.

Language: Английский

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Novel metamaterial foundation with multi low-frequency bandgaps for isolating earthquakes and train vibrations

Structures, Journal Year: 2024, Volume and Issue: 61, P. 106070 - 106070

Published: March 1, 2024

Language: Английский

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Mechanisms of multi-bandgap inertial amplification applied in metamaterial sandwich plates

International Journal of Mechanical Sciences, Journal Year: 2024, Volume and Issue: 277, P. 109424 - 109424

Published: May 27, 2024

Language: Английский

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