Subwavelength slit acoustic metamaterial barrier

Candelas, Pilar; Belmar, Francisco; Gomez-Lozano, Vicente; Rubio, Constanza

doi:10.1088/0022-3727/48/39/395501

Cited by 6 publications

(8 citation statements)

References 28 publications

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“…The positions of the Wood anomalies in the frequency domain for a periodic array with p = 0.35 m were 971 and 1942 Hz. The Wood anomaly at the frequency of 1942 Hz is not clearly observed due to the interference with the Fabry-Perot resonance [29]. By varying the lateral misalignment between the rows m, it is observed that, as the lateral misalignment is increased, insertion loss peaks appear at frequencies between 500 and 800 Hz which, in the case of lateral misalignment m = 0.125 m, did not appear.…”

Section: Subwavelength Slit Acoustic Screenmentioning

confidence: 91%

Open Acoustic Barriers: A New Attenuation Mechanism

Rubio¹,

Castiñeira-Ibáñez²,

Sánchez‐Pérez³

et al. 2016

Advances in Noise Analysis, Mitigation and Control

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One of the main environmental problems of the industrialised countries is the noise, which can be defined as an unwanted or unpleasant outdoor sound generated by transport, industry and human activities in general. When it is not possible to reduce the emission of noise acting on the source, the reduction of noise levels in its transmission phase using acoustic screens (AS) seems appropriate; such screens are in common use to reduce noise levels and have been extensively studied since the middle of the 20th century. Over the last decades, various acoustic screen designs have been investigated to increase the screening effect. The research carried out focuses on both the reduction of diffraction at the top edge of the screen by varying the shape at the top or adding absorptive materials to the noise screen, but all these screens are basically formed by a continuum rigid material with a superficial density high enough, to reduce transmission of noise through the screen, in accordance with the mass law. At the end of the nineties, another type of screen based on arrangements of isolated scatterers embedded in air, emerged. Among other interesting properties, these screens provide new mechanisms to control the noise based on the Bragg law. First, a Sonic Crystal Acoustic Screen (SCAS) was presented, where the scatterers are arranged following crystalline patterns. After that, a new prototype of AS based on sonic crystals appears, which increases the attenuation capabilities using arrangements based on fractal geometries. The screens designed in this way have been referred to as Fractal-based Sonic Crystal Acoustic Screens (FSCAS) in this chapter. In both the cases, the mechanism that prevents the transmission of noise, and therefore increases the noise attenuation, is the destructive Bragg interference due to a multiple scattering process. Finally, a new concept of AS based on a periodic arrangement of scatterers, with a slit dimension between them that is smaller than the wavelength is introduced. This latest screen is called Subwavelength Slit Acoustic Screen (SSAS) which presents a Wood anomaly and Fabry-Perot resonances, being the destructive interferences among the scattered waves, responsible for the attenuation capabilities of these screens. This new kind of AS (SCAS, FSCAS and SSAS) presents interesting properties and can be considered as a real

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Section: Subwavelength Slit Acoustic Screenmentioning

confidence: 91%

Open Acoustic Barriers: A New Attenuation Mechanism

Rubio¹,

Castiñeira-Ibáñez²,

Sánchez‐Pérez³

et al. 2016

Advances in Noise Analysis, Mitigation and Control

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“…The geometry shown in Figure 2a has been defined to solve the problem numerically. We have designed an acoustic barrier with 2 rows following the guidelines proposed by [9] in order to obtain a high level of attenuation. The commercial software COMSOL Multiphysics has been used to design the barriers, to develop the model and to obtain the half lengths of the pickets along Y direction, dag+2 dp/2).…”

Section: Numerical Approach: Finite Element Methodsmentioning

confidence: 99%

“…On the other hand, attenuation peaks also appear in midrange frequencies that are due to the interferences between propagating and evanescent waves [12]. A complete analysis of this type of acoustic barrier can be found in [9].…”

Section: Subwavelength Slit Acoustic Barriermentioning

confidence: 99%

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Numerical simulation and laboratory measurements on an open tunable acoustic barrier

et al. 2018

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A new open, thin and low frequency acoustic barrier is presented. These barriers, based on arrays of isolated pickets produce high acoustic attenuation in a selective range of frequencies related to their geometry and distribution. These open barriers are acoustically competitive with traditional ones, which are based on continuous and rigid materials. To show its versatility to in attenuating different selected ranges of frequencies, a compact numerical model is presented. Different cases are analysed and compared with experimental results. The accuracy of the experimental results compared to the simulated ones allow us to use the compact model to design these barriers in order to reduce both industrial and traffic noise on demand and to introduce them into the noise control market.

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“…Additionally, Rubio et al [43] observed that the attenuation peak shifts toward higher frequencies as the distance between scatterers increases, due to the destructive interference between the propagating and evanescent waves [53].…”

Section: Filling Factormentioning

confidence: 99%

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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Subwavelength slit acoustic metamaterial barrier

Cited by 6 publications

References 28 publications

Open Acoustic Barriers: A New Attenuation Mechanism

Open Acoustic Barriers: A New Attenuation Mechanism

Numerical simulation and laboratory measurements on an open tunable acoustic barrier

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

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