Trees as large-scale natural metamaterials for low-frequency vibration reduction

Liu, Yifan; Huang, Jiankun; Li, Yaguang; Shi, Zhifei

doi:10.1016/j.conbuildmat.2018.12.062

Cited by 66 publications

(29 citation statements)

References 35 publications

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“…Gulia and Gupta [69] obtained a reduction for noise impact by modelling rows of Thuja trees arranged in a periodic pattern on the sides of a road. Significant sound attenuation, with a maximum of 19 dB, has been obtained in frequencies up to 500 Hz, coherently with what was reported by Martínez-Sala et al [68], showing that properly arranged trees can be used to mitigate noise pollution while helping to reduce air pollution and vibrations to receivers [70]. Lagarrigue et al [71], by using a fast-growing plant, applied the principle of Helmholtz resonators to the green barriers.…”

Section: Green Barrierssupporting

confidence: 72%

Recent Developments in Sonic Crystals as Barriers for Road Traffic Noise Mitigation

2019

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Noise barriers are the most widespread solution to mitigate noise produced by the continuous growth of vehicular traffic, thus reducing the large number of people exposed to it and avoiding unpleasant effects on health. However, conventional noise barriers present the well-known issues related to the diffraction at the edges which reduces the net insertion loss, to the reflection of sound energy in the opposite direction, and to the complaints of citizens due to the reduction of field of view, natural light, and air flow. In order to avoid these shortcomings and maximize noise abatement, recent research has moved toward the development of sonic crystals as noise barriers. A previous review found in the literature was focused on the theoretical aspects of the propagation of sound through crystals. The present work on the other hand reviews the latest studies concerning the practical application of sonic crystal as noise barriers, especially for road traffic noise mitigation. The paper explores and compares the latest developments reported in the scientific literature, focused on integrating Bragg’s law properties with other mitigation effects such as hollow scatterers, wooden or recycled materials, or porous coating. These solutions could increase the insertion loss and frequency band gap, while inserting the noise mitigation action in a green and circular economy. The pros and cons of sonic crystal barriers will also be discussed, with the aim of finding the best solution that is actually viable, as well as stimulating future research on the aspects requiring improvement.

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Section: Green Barrierssupporting

confidence: 72%

Recent Developments in Sonic Crystals as Barriers for Road Traffic Noise Mitigation

2019

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“…However, their large scale extension, which can be extremely useful in solving many of the important engineering problems, mentioned above, requires development. Recent developments have indicated that metamaterials, if designed appropriately, can indeed provide a robust solution for the manipulation of elastic waves, thanks to their ability to create large frequency bandgaps even at large scale (Brûlé et al, 2014;Del Vescovo and Giorgio, 2014;Aravantinos-Zafiris and Sigalas, 2015;Moitra et al, 2015;Ungureanu et al, 2015Ungureanu et al, , 2019Colombi et al, 2016;Diatta et al, 2016;Mosby and Matouš, 2016;Palermo et al, 2016;Liu et al, 2019;Muhammad and Lim, 2019;Sun and Xiao, 2019).…”

Section: Introductionmentioning

confidence: 99%

The Influence of Clamping, Structure Geometry, and Material on Seismic Metamaterial Performance

et al. 2021

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Diverting and controlling the impact of elastic vibrations upon an infrastructure is a major challenge for seismic hazard mitigation and for the reduction of machine noise and vehicle vibration in the urban environment. Seismic metamaterials (SMs), with their inherent ability to manipulate wave propagation, provide a key route for overcoming the technological hurdles involved in this challenge. Engineering the structure of the SM serves as a basis to tune and enhance its functionality, and inspired by split rings, swiss-rolls, notch-shaped, and labyrinthine designs of elementary cells in electromagnetic and mechanical metamaterials, we investigate altering the structure geometries of SMs with the aim of creating large bandgaps in a subwavelength regime. Interestingly, clamping an SM to the bedrock creates a zero frequency stopband, but further effects can be observed in the higher frequency regime due to their specific geometry. We show that square stiff inclusions perform better in comparison to circular ones while keeping the same filling fraction. En route to enhancing the bandgap, we have also studied the performance of SMs with different constituent materials; we find that steel columns, as inclusions, show large bandgaps, however, the columns are too large for steel to be a feasible material in practical or financial terms. Non-reinforced concrete would be preferable for industry level scaling up of the technology because, concrete is cost-effective, easy to cast directly at the construction site and easy to provide arbitrary geometry of the structure. As a part of this study, we show that concrete columns can also be designed to exhibit bandgaps if we cast them within a soft soil coating surrounding the protected area for various civil structures like a bridge, building, oil pipelines, etc. Although our motivation is for ground vibration, and we use the frequencies, lengthscales, and material properties relevant for that application, it is notable that we use the equations of linear elasticity, and our investigation is more broadly relevant in solid mechanics.

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“…13 Therefore, various pillars placed on the ground have been extensively studied and experimentally verified. [14][15][16][17] It is worth mentioning that the use of Matryoshka-like structures, 18 fractal structures 19,20 and "rainbow trapping effect" 4 can realize the attenuation of seismic surface waves over a wider range of frequency. Among them, Miniaci et al 20 demonstrated the possibility of lowering BGs in elastic systems by introducing self-similar structures at multiple scales experimentally.…”

Section: Introductionmentioning

confidence: 99%

Subwavelength seismic metamaterial with an ultra-low frequency bandgap

Zeng

Peng

et al. 2020

Journal of Applied Physics

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A subwavelength seismic metamaterial (SMs) consisting of a three-component SM plate (SMP) and a half space is proposed to attenuate ultra-low frequency seismic surface waves. The design concept and models are verified firstly by lab-scale experiments on the SM consisting of a two-component SMP and a half space. Then we calculate the band structures of the one-dimensional and two-dimensional subwavelength SMs, and evaluate their ability to attenuate Rayleigh waves. A wide ultra-low frequency band gap can be found. And the Rayleigh waves are deflected by the subwavelength SM and converted into bulk waves in the frequency range of this band gap. When the number of the unit cells of the subwavelength SM is sufficient, the transmission distance and deflection angle of the Rayleigh waves are constant at the same frequency. This discovery is expected to open up the possibility of pragmatic 2 seismic protection for large nuclear power plants, ancient buildings and metropolitan areas.

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Trees as large-scale natural metamaterials for low-frequency vibration reduction

Cited by 66 publications

References 35 publications

Recent Developments in Sonic Crystals as Barriers for Road Traffic Noise Mitigation

Recent Developments in Sonic Crystals as Barriers for Road Traffic Noise Mitigation

The Influence of Clamping, Structure Geometry, and Material on Seismic Metamaterial Performance

Subwavelength seismic metamaterial with an ultra-low frequency bandgap

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