Propagation attenuation of elastic waves in multi-row infinitely periodic pile barriers: A closed-form analytical solution

Engineering Structures, Journal Year: 2024, Volume and Issue: 315, P. 118480 - 118480

Published: June 27, 2024

Language: Английский

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Topological metamaterial plates: Numerical investigation, experimental validation and applications

Engineering Structures, Journal Year: 2022, Volume and Issue: 275, P. 115288 - 115288

Published: Nov. 18, 2022

Language: Английский

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Low-frequency multiple topological interface modes in metamaterial beams with quasi-zero-stiffness resonators

Mechanics of Advanced Materials and Structures, Journal Year: 2024, Volume and Issue: unknown, P. 1 - 13

Published: July 30, 2024

To achieve multiple low-frequency topological interface modes (TIMs) while maintaining lightweight and load-bearing capacities in metamaterial beams, we propose novel beams equipped with double quasi-zero-stiffness (QZS) resonators. Following the introduction of negative stiffness (NS) mechanism, derived dispersion relations QZS resonators using transfer matrix method (TMM), performed comparative parametric analyses ratio on folded Dirac cones (DCs) locally resonant band gaps (LRBGs). Thanks to NS mechanism degrees freedom (DOFs) resonators, can realize DCs (< 500 Hz) beams. It is notable that adjusting oblique springs tune resonators' effective stiffness, implying custom frequency LRBGs by resonator. By altering distance between two obtain topologically distinct unit cells. Transmission simulations confirm presence TIMs at these domains. We also find effect mass geometric defects various positions minimal. The proposed could inspire innovative vibration energy harvesters devices.

Language: Английский

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Robust elastic wave transport in zone-folding induced topological hierarchical metamaterials

International Journal of Mechanical Sciences, Journal Year: 2023, Volume and Issue: 251, P. 108336 - 108336

Published: March 23, 2023

Language: Английский

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Attenuation of Rayleigh and pseudo surface waves in saturated soil by seismic metamaterials

Computers and Geotechnics, Journal Year: 2023, Volume and Issue: 165, P. 105854 - 105854

Published: Oct. 19, 2023

Language: Английский

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New topological rainbow trapping approach for phononic beam-foundation systems

Journal of Physics D Applied Physics, Journal Year: 2023, Volume and Issue: 56(38), P. 385309 - 385309

Published: June 7, 2023

Abstract Rainbow trapping is of great significance for frequency-based wave splitting and broadband attenuation. By recognizing the deficiency prevailing gradient rainbow reflection devices in terms energy concentration vibration isolation, we design a new topological device by introducing protected interface mode (TPIM) into device. Therefore, beam composed homogenous rested on an alternate foundation constructed. Using theoretical numerical analysis, perform unit-cell band structure analysis. The dependence bandgap region group velocity reference stiffness investigated. With help phase transition Zak successfully predict demonstrate TPIM. A quantitative evaluation advancement upon amplification attenuation also presented. We believe that robust one-dimensional will be useful many applications, such as harvesting, splitting, control.

Language: Английский

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A novel buried periodic in-filled pipe barrier for Rayleigh wave attenuation: Numerical simulation, experiment and applications

Engineering Structures, Journal Year: 2023, Volume and Issue: 297, P. 116971 - 116971

Published: Oct. 4, 2023

Language: Английский

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Complex dispersion analysis of true and pseudo surface waves propagating in two-dimensional viscoelastic seismic metamaterials

AIP Advances, Journal Year: 2024, Volume and Issue: 14(1)

Published: Jan. 1, 2024

In this paper, the wave characteristics of true surface waves (TSWs) and pseudo (PSWs) in two-dimensional (2D) seismic metamaterials are explored. The 2D metamaterial is formed by placing periodic concrete pillars on soil substrate. complex dispersion curves numerically calculated ω–kapproach. Kelvin–Voigt model adopted to describe material viscoelasticity. results show that not only TSW modes but also PSW should be taken into account evaluate mitigation capacity metamaterials. Due introduction viscoelasticity, TSWs PSWs convert from propagative mode evanescent mode. When propagate along substrate surface, their energy gradually leaks bulk substrate, leading transmission coefficient smaller than modes. Compared viscoelasticity plays a more important role reduction. Moreover, propagating length can predicted using relations.

Language: Английский

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Rainbow trapping and concentration of surface waves on broad waveguide

Journal of Physics D Applied Physics, Journal Year: 2024, Volume and Issue: 57(46), P. 465306 - 465306

Published: Aug. 15, 2024

Abstract In recent years, topological insulators have been widely designed to manipulate various types of classical waves. The edge states characterized by defect and backscattering immunity show great application potential in energy harvesting. This work reports a spin-locked surface wave channel, which consists concrete-filled steel tubes (CFST) placed on foundation soil. Here, the distance between lattice center CFST controls hopping strength adjacent atoms, determining phase transition. Introducing crystal with Dirac cones interface, then robust broad waveguide modes phononic heterostructure are explored. Notably, incorporating rainbow effect allows for precise regulation reliable concentration within waveguide. proposed surpasses traditional waveguides simultaneously focusing segregating energy, enabling applications low-frequency harvesting, sensing, logic gates. Our will provide an efficient recovery platform daily vibration especially vehicle loads.

Language: Английский

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Resonant Topological Metasurface for Low-Frequency Rayleigh Wave Attenuation and Energy Localization in the Homogeneous and Layered Elastic Half-Spaces

Published: Jan. 1, 2025

To effectively attenuate low-frequency Rayleigh waves and achieve energy localization, this study proposes a resonant topological metasurface based on the regional folding approach, further investigates its manipulation mechanisms for in homogeneous layered elastic half-spaces. aim, we develop general analytical framework proposed through thin-layer method (TLM) multiple scattering theory. Using framework, spatial modulation frequency spectrum is calculated, revealing existence of bandgap (TBG). The eigenfield analysis provides detailed insights into edge modes properties unit cells. A topologically protected interface mode (TPIM) generated at between two domains composed different units, exhibiting significant localization. Further indicates that exhibits dual Rayleigh-to-Rayleigh backscattering Rayleigh-to-bulk conversion within TBG, resulting enhanced wave isolation. Moreover, demonstrates strong robustness against stratification half-space, with TPIM unaffected by higher-order modes. It maintains great localization excellent vibration attenuation performance TBG half-space. This offers promising new avenues mitigation harvesting.

Language: Английский

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