Guidelines for the Acoustic Design of Absorptive Devices

Simón, Francisco; Pfretzschner, Jaime

doi:10.1260/095745604773600007

Cited by 9 publications

(4 citation statements)

References 9 publications

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“…In addition, granular materials offer good absorption combined with good mechanical strength unlike fibrous materials [23]. Particularly, the rubber crumb is widely used for acoustic conditioning in outdoors noise control [24]. The one used here is polydisperse and consists of grains with sizes in the range from 0 to 3mm.…”

Section: Rubber Crumb Parametersmentioning

confidence: 99%

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Noise control by sonic crystal barriers made of recycled materials

Sánchez‐Dehesa

García-Chocano

Torrent

et al. 2011

The Journal of the Acoustical Society of America

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A systematic study of noise barriers based on sonic crystals made of cylinders that use recycled materials like absorbing component is reported here. The barriers consist of only three rows of perforated metal shells filled with rubber crumb. Measurements of reflectance and transmittance by these barriers are reported. Their attenuation properties result from a combination of sound absorption by the rubber crumb and reflection by the periodic distribution of scatterers. It is concluded that the porous cylinders can be used as building blocks whose physical parameters can be optimized in order to design efficient barriers adapted to different noisy environments.

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Section: Rubber Crumb Parametersmentioning

confidence: 99%

“…FIG.2:The absorption value of rubber crumb measured in a standing wave tube. The theoretical coefficient has been obtained by fitting β 1 and β 2 in Eq (24)…”

mentioning

confidence: 99%

Noise control by sonic crystal barriers made of recycled materials

Sánchez‐Dehesa

García-Chocano

Torrent

et al. 2011

The Journal of the Acoustical Society of America

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“…The spectra of the emitting source can control all noise problems. Selection of sound absorbing materials will be based from materials type and dimension while controlling frequency of sound [15]. This paper discovers the sound absorption coefficient of natural fibers from agricultural wastes as potential acoustic absorber.…”

Section: Nadiatul Syima Mohd Shahid Mohamad Ali Ahmad Farah Liana Mmentioning

confidence: 99%

Sound Absorption Coefficient of Different Green Materials Polymer on Noise Reduction

Shahid¹,

Ahmad²,

Tahir³

2020

IJITEE

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One of the sources of noise pollution to environment is from the consumption of electrical and mechanical appliances usage at home and industries. Growth development and advancement of heavy equipment in construction work further emphasize the necessity used of new technologies for noise reduction. The best technique of control or reducing of noise is by using the materials that can absorb the noise by materials itself. Potential materials from agricultural waste as sound absorber were identified. There are two main objectives in this study; First is to produce acoustic absorber by using natural materials. Second is to identify their sound absorption coefficients. The samples were fabricated using the raw materials from banana stem, grass, palm oil leaves and lemongrass mixed with binding agents of polyurethane and hardener to the ratio of 1:4. The diameters of the samples consist of 28mm and 100mm and the thickness is 10mm. The samples sound absorption coefficients were measured according to standards ASTM E1050-98 / ISO 105342-2 (Impedance tube method). Sound absorption coefficient of the materials depends on frequencies choose. The frequencies values used in this study were in the range from 500Hz to 4500Hz. Material made from grass have a higher average sound absorption coefficient value which is 0.553. All tested samples also can be categories under class D type of materials based on sound absorption coefficient value.

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“…The good physical properties of natural fiber composites have ranked them among high-performance composites, which have environmental and economic advantages (Avella et al 2000). Sound absorbing materials are chosen in terms of material types and dimensions and also based on the frequency of sound to be controlled (Simon and Pfretzschner 2004). Poly (l-Lactic acid) reinforced ramie fiber shows the sound absorption coefficients of 0.089 to 0.353 in the frequency range of 250 to 1600 Hz (Chen et al 2010).…”

Section: Introductionmentioning

confidence: 99%

Processing and Characterization of Epoxy/Luffa Composites: Investigation on Chemical Treatment of Fibers on Mechanical and Acoustical Properties

et al. 2014

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This study focuses on the development of epoxy/luffa composites and the investigation of their mechanical and acoustical properties. The fibers underwent an alkalization treatment, and its effects on the mechanical and sound absorption properties of the composites were measured utilizing a universal testing machine and two-microphone transfer function impedance tube methods. The effects of chemical modifications on the fibers were studied using a scanning electron microscope (SEM). The thermal analyses of composites were conducted using thermo-gravimetric analysis (TGA). The composite's functional group was identified and evaluated using Fourier transform infrared spectroscopy (FTIR). The sound absorption coefficient of untreated and treated composites across a range of frequencies was very similar. Untreated composites appeared to perform better than those that were treated. Compared with untreated fiber composites, there was an improvement in the tensile strength of the treated fiber composites. The SEM characterization showed that the alkaline treatment changed the morphology of the fibers, resulting in a decrease in the sound absorption coefficients of the composites. The thermal characterization of composites showed that dehydration and degradation of lignin occurred in a temperature range of 40 to 260 °C, and the maximum percentage of cellulose was found to decompose at 380 °C.

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Guidelines for the Acoustic Design of Absorptive Devices

Cited by 9 publications

References 9 publications

Noise control by sonic crystal barriers made of recycled materials

Noise control by sonic crystal barriers made of recycled materials

Sound Absorption Coefficient of Different Green Materials Polymer on Noise Reduction

Processing and Characterization of Epoxy/Luffa Composites: Investigation on Chemical Treatment of Fibers on Mechanical and Acoustical Properties

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