The Present and Future Role of Acoustic Metamaterials for Architectural and Urban Noise Mitigations

Kumar, Sanjay; Lee, Heow Pueh

doi:10.3390/acoustics1030035

Cited by 71 publications

(34 citation statements)

References 92 publications

(95 reference statements)

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“…This finding was a milestone in the field of metamaterials. Following these research works, the field of metamaterials has been expanded in many areas like electromagnetics [6,7], optics [8][9][10], and acoustics [11][12][13][14][15].…”

Section: Acoustic Metamaterials: a Brief Overviewmentioning

confidence: 99%

Recent Advances in Acoustic Metamaterials for Simultaneous Sound Attenuation and Air Ventilation Performances

Kumar¹,

Lee²

2020

Crystals

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In the past two decades, acoustic metamaterials have garnered much attention owing to their unique functional characteristics, which are difficult to find in naturally available materials. The acoustic metamaterials have demonstrated excellent acoustical characteristics that paved a new pathway for researchers to develop effective solutions for a wide variety of multifunctional applications, such as low-frequency sound attenuation, sound wave manipulation, energy harvesting, acoustic focusing, acoustic cloaking, biomedical acoustics, and topological acoustics. This review provides an update on the acoustic metamaterials’ recent progress for simultaneous sound attenuation and air ventilation performances. Several variants of acoustic metamaterials, such as locally resonant structures, space-coiling, holey and labyrinthine metamaterials, and Fano resonant materials, are discussed briefly. Finally, the current challenges and future outlook in this emerging field are discussed as well.

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Section: Acoustic Metamaterials: a Brief Overviewmentioning

confidence: 99%

Recent Advances in Acoustic Metamaterials for Simultaneous Sound Attenuation and Air Ventilation Performances

Kumar¹,

Lee²

2020

Crystals

Self Cite

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“…Thus, the device measures its sound absorption capacity. Although a different test should be performed (for example according to UNI EN ISO 717-2 or ISO 140-12) to evaluate the transmission coefficient, if the material presents a high absorption coefficient, the transmission coefficient is consequently limited, also allowing good performance for the acoustic insulation of impact sounds [41].…”

Section: Acoustic Testsmentioning

confidence: 99%

Investigation on a Bio-Composite Material as Acoustic Absorber and Thermal Insulation

2020

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In order to limit the anthropic emissions of CO2, research is currently investigating new materials for the building sector. The main purpose is the reduction in the embodied energy consumption, especially in the residential sector, and consequently the limitation of the direct and indirect utilization of fossil fuels, for the indoor heating, cooling, and ventilation services. Indeed, the residential sector is affected by a high energy demand, thus the choice of improved materials is fundamental to improve the sustainability. All phases: construction, building life, and dismantling are impacting in terms of resource and energy consumption, both associated with the emissions of pollutants in the atmosphere. The aim of this experimental research is to study the thermal insulation and the acoustic absorption of a material composed by natural lime, water, and shives from sativa hemp, a variety of hemp usable for industrial applications. In order to assess the main characteristics of this material, some specimens have been made according to required shapes and sizes to test them in specific machines. The results obtained from the tests are compared with the values of similar lime-based materials already available on the market. The comparison shows how, in certain aspects, the lime and hemp shives materials represent a concrete alternative to conventional materials. This completely natural material would like to achieve thermal and acoustic comfort in indoor environments.

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“…Noise can cause a number of health problems, not only hearing loss or deafness, but also stress, tinnitus, high blood pressure, headaches, physical exhaustion, difficulty concentrating, stomach and digestive problems, circulatory problems, sleep disorders, fast heartbeat, withdrawal peripheral blood vessels, increased adrenaline levels, loss of magnesium. According to research by the Regional Office of Public Health in Banská Bystrica, construction site noise is cited as the second most annoying set of unwanted sounds [2,[9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

“…However, it is also possible to measure values, for example inside buildings and to evaluate the attenuation by the perimeter cladding and other structures. Field measurements are not covered in this paper, but many studies are available [12,[21][22][23][24][25][26][27][28][29]. Figure 2 presents a graphically processed methodology of the possibility of access of the contractor to solve the noise from construction.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Construction Site Noise to Allow the Optimisation of Construction Processes and Construction Machinery Selection

Kantová

2021

Applied Sciences

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During the pre-construction phase of an investment project, a construction plan is usually prepared by the building contractor. It contains financial plans, schedules, technical regulations with working procedures and proposals for the deployment of construction machinery and work teams. These items are then optimised in order to save money, shorten construction time and increase the quality of the final work while ensuring environmental and safety standards are maintained at the site. The ecological aspects of building work include compliance with the hygiene limits for building site noise, which is caused in particular by the simultaneous operation of machines. In the Czech Republic, limit values are set by Government Regulation 272/2011 Coll., as amended, on the protection of health against the adverse effects of noise and vibrations. The evaluation of construction site noise is not usually performed by contractors themselves and noise is usually measured only at the construction site, where work is limited or additional measures are taken in the case of values that exceed the stipulated limits. As the values in the construction plan should be as close as possible to reality during the implementation of the plan, it would seem appropriate to include such noise assessments within it. The purpose of this paper is to present an example of such an evaluation from the formal and material standpoint. The assessment has been conducted in the form of a specific noise study, expanded by a commentary on the treatment of the hypotheses. It shows how to obtain input data for evaluation, divide sub-calculations and use the supporting SW of the Hluk plus product for the purposes of construction information modelling, as well as how to correctly set noise sources and the positions of measured points for evaluation by the model within this programme. Subsequently, options for the evaluation of appropriate measures are listed, including their inclusion in reassessments.

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The Present and Future Role of Acoustic Metamaterials for Architectural and Urban Noise Mitigations

Cited by 71 publications

References 92 publications

Recent Advances in Acoustic Metamaterials for Simultaneous Sound Attenuation and Air Ventilation Performances

Recent Advances in Acoustic Metamaterials for Simultaneous Sound Attenuation and Air Ventilation Performances

Investigation on a Bio-Composite Material as Acoustic Absorber and Thermal Insulation

Evaluation of Construction Site Noise to Allow the Optimisation of Construction Processes and Construction Machinery Selection

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