Attenuation Mechanism of Rayleigh Waves by Elastic Metasurfaces in Various Layered Half-Spaces

International Journal of Mechanical Sciences, Journal Year: 2025, Volume and Issue: 290, P. 110113 - 110113

Published: March 1, 2025

Language: Английский

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Wide Rayleigh waves bandgap engineered metabarriers for ground born vibration attenuation

Engineering Structures, Journal Year: 2021, Volume and Issue: 246, P. 113019 - 113019

Published: Aug. 27, 2021

Language: Английский

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Perspective: Acoustic Metamaterials in Future Engineering

Engineering, Journal Year: 2022, Volume and Issue: 17, P. 22 - 30

Published: July 28, 2022

Acoustic metamaterials (AMMs) are a type of artificial materials that make use appropriate structural designs and exhibit exotic properties not found in natural materials, such as negative effective material parameters (e.g., bulk modulus, mass density, refractive index). These interesting offer novel means for sound manipulation thus have drawn great deal attention. Over the past two decades, tremendous progress has been made fundamental research AMMs, which only promoted development modern acoustics but also shown potential AMMs engineering applications. Here, we review recent developments with focus on their future engineering, especially most promising fields absorption/isolation, acoustic imaging, cloaking, so on, furthermore, outline opportunities challenges they encountering.

Language: Английский

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A three-dimensional twisted phononic crystal with omnidirectional bandgap based on inertial amplification by utilizing translation-rotation coupling

Journal of Sound and Vibration, Journal Year: 2022, Volume and Issue: 541, P. 117307 - 117307

Published: Sept. 14, 2022

Language: Английский

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Novel periodic pile barrier with low-frequency wide bandgap for Rayleigh waves

International Journal of Mechanical Sciences, Journal Year: 2022, Volume and Issue: 243, P. 108006 - 108006

Published: Dec. 5, 2022

Language: Английский

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L-shape triple defects in a phononic crystal for broadband piezoelectric energy harvesting

Nano Convergence, Journal Year: 2022, Volume and Issue: 9(1)

Published: June 15, 2022

This study proposes a phononic crystal (PnC) with triple defects in an L-shape arrangement for broadband piezoelectric energy harvesting (PEH). The incorporation of PnCs has attracted significant attention PEH fields owing to properties such as localization and amplification near the defect. Several studies have been conducted enhance output electric power PnC-based systems single defects. However, it is susceptible limitations narrow bandwidth. Recently, double-defect-incorporated proposed widen bandwidth via defect-band splitting. Nevertheless, performance rapidly decreases frequency range between split defect bands. single- can be resolved by design concept, called PnC. isolated at top vertex letter 'L' compensates systems, whereas double bottom vertices compensate single-defect-incorporated systems. Hence, effectively confine harvest elastic-wave over frequencies while enhancing application effectiveness concept numerically validated using finite element method. In case circular hole-type PnC, verified that PnC broadens bandwidth, improves voltage compared those expands space defect-incorporated might shed light on other engineering applications detector elastic wave transfer.

Language: Английский

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A level set-based interface-enriched topology optimization for the design of phononic crystals with smooth boundaries

Computer Methods in Applied Mechanics and Engineering, Journal Year: 2023, Volume and Issue: 408, P. 115888 - 115888

Published: March 10, 2023

Phononic crystals can be designed to show band gaps—ranges of frequencies whose propagation is strongly attenuated in the material. In essence, their working principle based on destructive interference waves reflecting from periodic arrangement material interfaces (i.e., Bragg scattering). Consequently, capturing accurately behavior at requires appropriate numerical modeling and computational design techniques. However, commonly used density-based representation popular topology optimization methods results a diffuse staircased boundary. The heavily refined finite element meshes required compensate for this boundary description exceedingly large expensive problems. paper, we demonstrate adverse effect description. Furthermore, propose level set-based procedure with an enriched method that shows improved performance when compared approach.

Language: Английский

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Theoretical optimisation of a novel gas sensor using periodically closed resonators

Scientific Reports, Journal Year: 2024, Volume and Issue: 14(1)

Published: Jan. 30, 2024

Abstract This study investigates using the phononic crystal with periodically closed resonators as a greenhouse gas sensor. The transfer matrix and green methods are used to investigate dispersion relation theoretically numerically. A linear acoustic design is proposed, waveguides filled samples. At center of structure, defect resonator excite an resonant peak inside bandgap. localized shifted higher frequencies by increasing speed decreasing density sensitivity, transmittance peak, bandwidth, figure merit calculated at different geometrical conditions select optimum dimensions. proposed sensor records sensitivity 4.1 Hz m −1 s, 332 quality factor 113,962, detection limit 0.0003 s . As result its high performance simplicity, can significantly contribute sensors bio-sensing applications.

Language: Английский

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Electrically controllable behaviors in defective phononic crystals with inductive-resistive circuits

International Journal of Mechanical Sciences, Journal Year: 2024, Volume and Issue: 278, P. 109485 - 109485

Published: June 15, 2024

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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