Sustainable Acoustic Metasurfaces for Sound Control

Gori, Paola; Guattari, Claudia; Asdrubali, Francesco; Vollaro, Roberto De Lieto; Monti, Alessio; Ramaccia, Davide; Bilotti, Filiberto; Toscano, Alessandro

doi:10.3390/su8020107

Cited by 11 publications

(10 citation statements)

References 42 publications

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“…Moving toward sustainability, many studies have been looking for noise mitigation also taking into account environmental issues, by using appropriate recycled or recyclable materials [23,24]. In this line, the use of straw bales as a sound insulation material might be very interesting.…”

Section: Introductionmentioning

confidence: 99%

Laboratory and In-Situ Measurements for Thermal and Acoustic Performance of Straw Bales

et al. 2019

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This paper investigates the performance of timber-framed walls insulated with straw bales, and compares them with similar walls containing expanded polystyrene (EPS) instead of straw bales. First, thermal conductivity, initial water content, and density of the straw bales were experimentally measured in a laboratory set-up, and the dependence of the thermal conductivity of the dry material on temperature was described. Then, the two insulation solutions were compared by looking at their steady and periodic thermal transmittance, decrement factor, phase shift, internal areal heat capacity and surface mass. Finally, the acoustic performance of both wall typologies was analyzed by means of in situ measurements in two-story buildings built in Southern Italy. The weighted apparent sound reduction index for the partition wall between two houses and the weighted standardized level difference for the façades were assessed based on ISO Standard 16283. The results indicate that the dry straw bales have an average thermal conductivity of k = 0.0573 W/(m·K), and their density is around 80 kg/m3. In addition, straw bale walls have good steady thermal performance, but they still lack sufficient thermal inertia, as witnessed by the low phase shift and the high periodic thermal transmittance. Finally, according to the on-site measurements, the results underline that the acoustic performance of the straw bale walls is far better than the walls adopting traditional EPS insulation. Overall, the straw bales investigated are a promising natural and sustainable solution for thermal and sound insulation of buildings.

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Section: Introductionmentioning

confidence: 99%

Laboratory and In-Situ Measurements for Thermal and Acoustic Performance of Straw Bales

et al. 2019

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“…In order to prevent such effects, the scientific community has extensively studied the most impacting sources on land, which are the major transportation infrastructure and the industries. Road and railway traffic and airports have received a large amount of attention from the scientific community in all aspects, from their noise generation mechanisms [11][12][13] to their propagation; the mapping of their impact on land and the population [14,15]; and their mitigation with innovative solutions, such as low-noise pavements made of recycled materials [16,17], real time monitoring systems [18,19], and sustainable mitigation solutions [20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Classification of Noise Sources for Port Area Noise Mapping

et al. 2021

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Maritime transportation is recognized to have advantages in terms of environmental impact compared to other forms of transportation. However, an increment in traffic volumes will also produce an increase in noise emissions in the surroundings for a greener source, as ports are frequently surrounded by urban areas. When more sources or higher noise emissions are introduced, the noise exposure of citizens increases, and the likelihood of official complaints rises. As a consequence, among the most demanding aspects of port management is effective noise management aimed at a reduction in the exposure of citizens while ensuring the growth of maritime traffic. At the same time, the topic has not been thoroughly studied by the scientific community, mostly because port areas are challenging from a noise management point of view; they are often characterized by a high degree of complexity, both in terms of the number of different noise sources and their interaction with the other main transportation infrastructure. Therefore, an effective methodology of noise modeling of the port area is currently missing. With regard to the INTERREG Maritime Program, the present paper reports a first attempt to define noise mapping guidelines. On the basis of the current state-of-the-art and the authors’ experiences, noise sources inside port areas can be divided into several different categories: road sources, railway sources, ship sources, port sources, and industrial sources. A further subdivision can be achieved according to the working operation mode and position of the sources. This classification simplifies actions of identification of the responsible source from control bodies, in the case that noise limits are exceeded or citizen complaints arise. It also represents a necessary tool to identify the best placing of medium/long-term noise monitoring stations. The results also act as a base for a future definition of specific and targeted procedures for the acoustic characterization of port noise sources.

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“…After the publication of European Noise Directive 2002/49/EC (END) [21], sustainability has grown towards the noise sources required by END: road and railway traffic [22][23][24], airports [25,26], and wind turbines [27,28]. For these type of noise sources, the scientific community has put a lot of effort into developing innovative and environmentally-friendly mitigations, such as low-noise pavements [29,30], live and integrated monitoring systems [31,32], sustainable metamaterial absorber [33,34], and sonic crystal noise barriers made of recycled materials [35].…”

Section: Introductionmentioning

confidence: 99%

Pass-by Characterization of Noise Emitted by Different Categories of Seagoing Ships in Ports

Fredianelli

Nastasi

Bernardini³

et al. 2020

Sustainability

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In the light of sustainability, satisfactory living conditions is an important factor for people’s positive feedback in their own living environment. Acoustic comfort and noise exposure should then be carefully monitored in all human settlements. Furthermore, it is already well-known that high or prolonged noise levels may lead to unwanted health effects. Unfortunately, while in the last decades scientists and public authorities have investigated the noise produced by roads, trains, and airports, not enough efforts have been spent in studying what happens around the coastal and port areas. Following the attention brought to the subject by recent European projects on noise in port areas, the present paper characterizes the sound power level and 1/3 octave band sound power spectrum of seagoing ships while moving at low speeds. Five different categories have been distinguished: Roll-on/roll-off (RORO), container ship, oil tanker, chemical tanker, and ferry. The analysis is based on a continuous noise measurement lasting more than three months, performed in the industrial canal of the port of Livorno (Italy). The resulting noise emissions are new and useful data that could be inserted in acoustic propagation models to properly assess the noise in the areas affected by port activities. Thus, the present work can act as a supporting tool in planning ship traffic in ports towards better sustainability.

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Sustainable Acoustic Metasurfaces for Sound Control

Cited by 11 publications

References 42 publications

Laboratory and In-Situ Measurements for Thermal and Acoustic Performance of Straw Bales

Laboratory and In-Situ Measurements for Thermal and Acoustic Performance of Straw Bales

Classification of Noise Sources for Port Area Noise Mapping

Pass-by Characterization of Noise Emitted by Different Categories of Seagoing Ships in Ports

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