A note on a circular panel sound absorber with an elastic boundary condition

Arenas, Jorge P.; Ugarte, Felipe

doi:10.1016/j.apacoust.2016.07.002

Cited by 26 publications

(17 citation statements)

References 12 publications

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“…The gelling process is continuously gone through the polymerization reaction, and the blowing process is also continued until no more water remained for reaction in the mixture . The extent of blowing reaction for CO 2 generation is crucial in forming a cavity and interconnecting pores, and the cell morphology is a very important characteristic to analyze the sound absorption property.…”

Section: Resultsmentioning

confidence: 99%

“…The use of the porous mediums as sound absorbents and insulating materials are remarkable means to achieve noise pollution reduction . Several kinds of microcellular polymeric foams such as polyurethane foams (PUFs), polystyrene, and polypropylene, polymeric felts, glass wools, and different woven and nonwoven fabrics can be fitted in the mandatory places to remove bothersome noises …”

Section: Introductionmentioning

confidence: 99%

“…The sound absorption performance can be assessed by the sound absorption coefficient (α) which depends on the both solid‐phase attributes and cellular morphology of foams including macroscopic density, tortuosity, thickness of cell walls and struts, airflow resistivity, porosity, average cell size, and cell size distribution …”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Acoustic damping flexible polyurethane foams: Effect of isocyanate index and water content on the soundproofing

Baghban

Khorasani

Sadeghi

2018

J of Applied Polymer Sci

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High-efficiency sound absorbing flexible polyurethane foams (FPUFs) are manufactured using nonpolar polyester resin, methylene diphenyl diisocyanate, and other reagents by one-shot bulk polymerization. In this study, the impact of the isocyanate index (90, 100, and 110) and water content (2.5 and 5%) on the microphase separation and soundproofing behavior of FPUFs are examined using atomic force microscopy, Fourier transform infrared spectroscopy, optical microscope, and an impedance tube device. The results reveal that the increase of the isocyanate index and water content leads to the increase of the cell size, cell size distribution, open-cell content, cell wall roughness, and microphase separation. Also, maximum sound absorption coefficient (α) reaches to 0.98 and the average of α in the frequency range of 1500-4000 Hz increases from 0.7 to 0.87 by increasing the water content from 2.5 to 5% and isocyanate index from 90 to 110; therefore, acoustic damping performance enhances up to 26.24% due to the synergic effects of microphase separation on the viscose media formation, open-cell content, cell wall roughness, cell size, and cell size distribution. In conclusion, FPUFs with an optimal amount of microphase separation and drainage flow can be a promising candidate for sound insulating materials.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Acoustic damping flexible polyurethane foams: Effect of isocyanate index and water content on the soundproofing

Baghban

Khorasani

Sadeghi

2018

J of Applied Polymer Sci

View full text Add to dashboard Cite

show abstract

“…Finding an effective way to subdue the noise pollution has attracted the interest of many scientists. Meanwhile, it was previously established that a good noise insulator must possess internal resonant effect [132,133]. As a result, blended mastication-hot processing was used to fabricate discarded degummed corn husk fibre and thermoplastic polyurethane (TPU) particles into a micro-slit plate having the potential of an excellent absorption acoustic performance.…”

Section: Potential Application Of Straw Fibres Bio-composite Boardsmentioning

confidence: 99%

Key advances in development of straw fibre bio-composite boards: An overview

Aladejana

Fan

2020

Mater. Res. Express

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In recent years, considerable attention have been given to the development and utilization of biodegradable fibres for bio-composite boards. This is due to the increase in the environmental consciousness and the need for sustainable development which enable establishment of new materials majorly for packaging, aircraft, furniture, and automobile. Straw fibres (wheat, rice, and corn fibre) are the most available natural agricultural wastes products, which has been utilized for the production of these new materials. This paper hence reviews the enhancement in production methodology and properties of the straw fibres bio-composite boards to add further scientific knowledge to the potentiality of using agricultural fibres as value added products. The future replacement of conventional wood fibres for the production of bio-composite panels, especially with agricultural wastes, could be centered on straw fibres. The introduction of straw fibres in polymer matrices were presented based on various research outcomes. Biodegradable fibres could be regarded as a good fibrous composite material. Although, more efforts are still needed in developing facile straw fibre composite production methods and materials with robust industrial and domestic applications.

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“…Furthermore, due to resonance at its natural frequency, the membrane is able to absorb low-frequency sound energy. For thicker membranes, the effect of bending stiffness may have to be considered [7]. Nanofibrous elements and the optimal rigidity of the membrane can lead an acoustic system to vibrate more efficiently [8,9].…”

Section: Introductionmentioning

confidence: 99%

Sound Absorption of Sustainable Polymer Nanofibrous Thin Membranes Bonded to a Bulk Porous Material

Ulrich

Arenas

2020

Sustainability

Self Cite

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In this paper, the standardized characterization of nanofibrous membranes used to coat three porous bulk acoustical materials (melamine foam, a polyester textile, and an MDF perforated panel) is presented. The membranes were manufactured from recyclable Polyamide 6 (PA6) and water-soluble polyvinyl alcohol (PVA) using the needleless electrospinning technique. This resulted in very thin membranes that had high porosity and very high airflow resistivity. The membranes were collected in a high-permeability nonwoven substrate. Measured results in both an impedance tube and a reverberation room showed significant improvements in the sound absorption performance of the bulk materials after incorporating the nanofibrous layer. The application of the membranes on the surface of a traditional air-backed perforated panel also improved the sound absorption, exhibiting a broad peak of sound absorption in the low-frequency range. This was particularly true when the membrane area weight was increased. It is concluded that these materials, manufactured as described in this paper, can be alternatives to glass, mineral, and ceramic fibrous materials, which have high carbon footprints.

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A note on a circular panel sound absorber with an elastic boundary condition

Cited by 26 publications

References 12 publications

Acoustic damping flexible polyurethane foams: Effect of isocyanate index and water content on the soundproofing

Acoustic damping flexible polyurethane foams: Effect of isocyanate index and water content on the soundproofing

Key advances in development of straw fibre bio-composite boards: An overview

Sound Absorption of Sustainable Polymer Nanofibrous Thin Membranes Bonded to a Bulk Porous Material

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