Inertially amplified seismic metamaterial with an ultra-low-frequency bandgap

Applied Physics Letters, Journal Year: 2022, Volume and Issue: 121(8)

Published: Aug. 22, 2022

In last two decades, it has been theoretically and experimentally demonstrated that seismic metamaterials are capable of isolating surface waves. Inertial amplification mechanisms with small mass have proposed to design isolate elastic waves in rods, beams, plates at low frequencies. this Letter, we propose an alternative type metamaterial providing ultra-low-frequency bandgap induced by inertial amplification. A unique kind inertially amplified is first conceived designed. Its characteristics for flexural then numerically demonstrated. Finally, the embedded mechanism introduced on a soil substrate strongly attenuating around frequency 4 Hz. This work provides promising way conceive steer control

Language: Английский

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Seismic metamaterials based on coupling mechanism of inertial amplification and local resonance

Physica Scripta, Journal Year: 2023, Volume and Issue: 98(4), P. 045024 - 045024

Published: March 15, 2023

Abstract Inertial amplification mechanisms could be used to control the propagation of elastic waves in beams and slabs, but it was a difficult problem apply inertial seismic metamaterials design low-frequency broadband. This paper presents inertially amplified locally resonant metamaterial (IALR-SM) using coupling mechanism local resonance. In contrast (LRSM), large-mass columns as resonators IALR-SM are attached connector small-mass form inertia structures. The finite element method calculates eigenmodes’ band structure displacement vector field. Numerical results indicated that bandwidth increases by 194% compared LRSM for surface below 20 Hz. formation yield large gaps is attributed resonance amplification. addition, numerical effects geometric parameters on investigated. findings showed side length plays vital role determining which dominant. Finally, field experiments demonstrated generates

Language: Английский

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Sound transmission of truss-based X-shape inertial amplification metamaterial double panels

International Journal of Mechanical Sciences, Journal Year: 2024, Volume and Issue: 283, P. 109669 - 109669

Published: Aug. 23, 2024

Language: Английский

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Multi-objective optimal design of mechanical metafilters based on principal component analysis

International Journal of Mechanical Sciences, Journal Year: 2023, Volume and Issue: 248, P. 108195 - 108195

Published: Feb. 11, 2023

In this paper, an advanced computational method is proposed, whose aim to obtain approximately optimal design of a particular class acoustic metamaterials, by means novel combination multi-objective optimization and dimensionality reduction. Metamaterials are modeled as beam lattices with internal local resonators coupled the microstructure through viscoelastic phase. The dynamics governed set integro-differential equations, that transformed into Z-Laplace space in order derive eigenproblem solution provides dispersion relation free in-plane propagating Bloch waves. A problem stated, achieve largest multiplicative trade-off between bandwidth first stop band one successive pass metamaterial frequency spectrum. Motivated multi-dimensionality parameters space, goal above achieved integrating numerical machine learning. Specifically, solved combining sequential linear programming algorithm principal component analysis, exploited data reduction technique applied properly sampled field gradient directions, perform optimized sensitivity analysis. This represents original way applying analysis connection optimization. Successful performances proposed its savings demonstrated.

Language: Английский

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Vibration mitigation in porous soil using periodic rock-socketed pile barriers

Soil Dynamics and Earthquake Engineering, Journal Year: 2023, Volume and Issue: 171, P. 107956 - 107956

Published: April 12, 2023

Language: Английский

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