Noise control strategies using composite porous materials – Simulations and experimental validations on plate/cavity systems

Bécot, François‐Xavier; Jaouen, Luc; Sgard, Franck

doi:10.3397/1.3609820

Cited by 10 publications

(5 citation statements)

References 23 publications

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“…It is chosen to focus on the low frequency range, namely up to 600 Hz, where porous materials present low performances. The results presented here are comparable to those presented by Becot [4]. Numerical results show that the system exhibits two different behaviors depending on the frequency.…”

Section: Introductionsupporting

confidence: 88%

On the composites consisting of randomly distributed fibers

Ilie

2016

Proc Appl Math and Mech

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The results highlight and interpret the testing and properties of natural fibre composites including, non-destructive and high strain rate testing. The potential of this material for noise enclosures is investigated by using a coupled method cnoidalExtended Finite Element Method (XFEM). XFEM enables the accurate approximation of solutions with jumps, discontinuities or general high gradients across interfaces. The dissipation of the sound power into a plate/cavity system shows the efficiency of this composite to achieve noise reduction better to that obtained at low and higher frequencies with traditional foams.

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Section: Introductionsupporting

confidence: 88%

On the composites consisting of randomly distributed fibers

Ilie

2016

Proc Appl Math and Mech

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“…The influence of the double porosity mainly depends on the permeability contrast between the two porous materials. Usage of double porous material shows that an interesting compromise could be achieved by increasing the absorption and limiting the loss of sound insulation due to the presence of pores . The literature has also revealed the potential of these materials to design passive sound-absorbing solutions with good performances even at low frequencies .…”

Section: Resultsmentioning

confidence: 99%

“…Usage of double porous material shows that an interesting compromise could be achieved by increasing the absorption and limiting the loss of sound insulation due to the presence of pores. 45 The literature has also revealed the potential of these materials to design passive sound-absorbing solutions with good performances even at low frequencies. 46 The added absorption effect is due to a partial coupling between the acoustic fields in the two pore networks.…”

mentioning

confidence: 99%

Carbon Nanotubes/Polyurethane Foam for Noise Passivation at 4000 Hz

Agrawal,

Gaur,

Mani

et al. 2023

ACS Appl. Nano Mater.

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Occupational noise-induced hearing loss prominently occurs due to unavoidable sound frequencies mainly in the range of 3000 to 6000 Hz. This frequency region thus holds great importance for acoustic insulation. Polymeric foams with open cellular frameworks are mostly employed for sound absorption in these frequency regions. To enhance their sound-absorbing ability, nanofillers are integrated with the polymeric matrix. However, the majority of the incorporation methods result in a single-phased porous structure, which limits their potential. Herein, an altered method of modification of multiwall carbon nanotubes (MWCNTs) is explored for the preparation of modified polyurethane foam via a simple one-pot immersion-hydrothermal-evaporation method. A unique self-assembled nanolayered structure with nanopores was fabricated through optimized experimental conditions resembling a double three-dimensional form. This gave rise to an additional resonating-type structure within the porous-type matrix. Thus, a hybrid-type sound-absorbing material with distinctive structure was fabricated which could help achieve focused sound absorption ability at the desired frequency. The sound pressure level evaluated at a frequency of 4000 Hz was found to improve through incorporation of 0.5 wt % modified CNTs. The mean percentage enhancement in sound isolation for treated foam in comparison to untreated foam is 15 to 20% at 4000 Hz. The development of distinctive structures within the polymeric framework opens up a plethora of horizons that could be employed at the industrial level as well, and such structures could be engaged for achieving other eccentric properties, which would further enhance their applicability.

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“…It is also found that for the filler content of 1.4% of NS and NC sound absorption is the highest (Figure 7c). The increase in acoustic effect may be due to the large surface area of fillers at the PU-filler interface where the acoustic energy can be dissipated as heat energy [6]. Further in case of porous sound absorbers sound propagation takes place in a network of interconnected pores such that viscous and thermal interaction causes the acoustic energy to be dissipated and convert them into heat energy.…”

Section: Studies On Mechanical Propertiesmentioning

confidence: 99%

Nanomaterials in PU Foam for Enhanced Sound Absorption at Low Frequency Region

Gayathri

Vasanthakumari

2014

AMR

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Lot of research is going on to develop materials suitable for absorbing sound and reducing noise. By virtue of their superior vibration damping capability and attractive characteristics such as visco elasticity, simple processing and commercial availability, polyurethane foams are extensively applied not only in automotive seats but also in various acoustical parts. However, the sound absorption coefficient of polyurethane foams is high (0.8 1.0) in high frequencies in the range 300 to 10000Hz while it is found to be low (0 to 0.5) at low frequencies (10 to 200 Hz). In this study new polyurethane based porous composites were synthesized by in situ foam rising polymerization of polyol and diisocyanate in the presence of fillers such as nanosilica (NS) and nanoclay (NC). The effect of these fillers at various concentrations up to 2% was studied for sound absorption characteristics in the frequency range 100-200Hz. Sound absorption coefficient was determined using standing wave impedance tube method. The sound absorption coefficient of filled PU foams increases from 0.5 to 0.8 with frequency increase from 100 to 200 Hz at higher content of the nanofillers employed. This research work is further extended to study the sound absorption capacity of unfilled PU foam with varying thickness and also hybrid foams with woven glass (GFC) and polyester cloth (PEC). The unfilled foam with 60mm of thickness gives sound absorption value same as that of 15mm of filled foam. Further enhanced absorption value is achieved with PU/NS-GFC hybrid. The results obtained are explained based on the porosity of composite structure and foam cell size.Key words Polyurethane foam, sound absorption coefficient, nanosilica, nanoclay, low frequency sound.

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Noise control strategies using composite porous materials – Simulations and experimental validations on plate/cavity systems

Cited by 10 publications

References 23 publications

On the composites consisting of randomly distributed fibers

On the composites consisting of randomly distributed fibers

Carbon Nanotubes/Polyurethane Foam for Noise Passivation at 4000 Hz

Nanomaterials in PU Foam for Enhanced Sound Absorption at Low Frequency Region

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