Review in Sound Absorbing Materials

Sagartzazu, X.; Hervella-Nieto, L.; Pagalday, J. M.

doi:10.1007/s11831-008-9022-1

Cited by 167 publications

(109 citation statements)

References 36 publications

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“…The difference between these results does not exceed 2 dB. This confirms the conclusion presented in Sagartzazu and Hervella (2008) and shows the similitude in acoustic impedance models for porous materials. The acoustic behavior of the duct element can be described as follows:…”

Section: Numerical Resultssupporting

confidence: 88%

Technical Note. Effect of Liner Characteristics on the Acoustic Performance of Duct Systems

Othmani¹,

Hentati²,

Taktak

et al. 2015

Archives of Acoustics

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Porous materials are used in many vibro-acoustic applications. Different models describe their performance according to material's intrinsic characteristics. In this paper, an evaluation of the effect of the porous and geometrical parameters of a liner on the acoustic power attenuation of an axisymmetric lined duct was performed using multimodal scattering matrix. The studied liner is composed by a porous material covered by a perforated plate. Empirical and phenomenal models are used to calculate the acoustic impedance of the studied liner. The later is used as an input to evaluate the duct attenuation. By varying the values of each parameter, its influence is observed, discussed and deduced.

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Section: Numerical Resultssupporting

confidence: 88%

Technical Note. Effect of Liner Characteristics on the Acoustic Performance of Duct Systems

Othmani¹,

Hentati²,

Taktak

et al. 2015

Archives of Acoustics

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“…[9][10][11] Furthermore, it is acknowledged that the epoxy group can occur to react with hydroxyl in resol via etherification. [13][14][15] In our study, we developed a new simple physical foaming approach to prepare epoxy modified Where m 1 is the mass of dry phenolic foam, m 2 is the mass t of soaked phenolic foam after 24h 12 There are many studies on acoustic insulation materials, such as polyurethane and Polyethylene terephthalate foams, and can do a lot of sound-absorbing foam green and recyclable.…”

Section: Introductionmentioning

confidence: 99%

A simple preparation method and characterization of epoxy reinforced microporous phenolic open-cell sound absorbent foam

Gong

Chu

et al. 2015

RSC Adv.

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The cell distribution of open-celled phenolic foams with different contents of epoxy (0 wt %, 5 wt %, 10 wt %, 15 wt %). Abstract: A series of micro-porous phenolic open-cell sound absorbent foams reinforced by epoxy resin were fabricated by physical foaming method. The compound emulsifiers consisting of anionic and non-ionic surfactants were physical blended at high speed with modified resols, foaming agent and mixed acid curing agent. The viscosity, surface tension, gel permeation chromatography (GPC) were characterized. Fabricated foams were characterized for pore size distribution, water absorption, sound absorption, mechanical and thermal properties. Surface tension and porosity analysis demonstrated that anionic surfactant, sodium dodecyl sulfonate (SDS) promoted the formation of homogeneous micro-pores. And the open cell porosity reached up to 90%. The open-celled pore structure and cell size distribution revealed by Scanning electron microscopy (SEM) demonstrated that more homogeneous and smaller open cells existed with increasing dosage of epoxy. And the sound absorption properties were increased significantly when adding the epoxy resin, even can reached about 95%. The micro-pore and cell-distribution controlled by the content of epoxy resin and the ratio of SDS/tween-80, greatly improved the mechanical strengths of phenol-formaldehyde resin (PF).

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“…Common sound absorption materials include porous sound absorption materials and resonant sound absorption materials. 44 In porous sound absorption materials, the incident acoustic energy is primarily converted into heat due to viscous and thermal losses at the walls of the interior pores and tunnels. It is a feasible measure to improve sound absorption coefficients by letting as much incident waves as possible propagate into sound absorption materials.…”

Section: Sound Absorption Performance and Discussionmentioning

confidence: 99%

Experimental study on the sound absorption characteristics of continuously graded phononic crystals

Zhang

et al. 2016

AIP Advances

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Novel three-dimensional (3D) continuously graded phononic crystals (CGPCs) have been designed, and fabricated by 3D printing. Each of the CGPCs is an entity instead of a combination of several other samples, and the porosity distribution of the CGPC along the incident direction is nearly linear. The sound absorption characteristics of CGPCs were experimentally investigated and compared with those of uniform phononic crystals (UPCs) and discretely stepped phononic crystals (DSPCs). Experimental results show that CGPCs demonstrate excellent sound absorption performance because of their continuously graded structures. CGPCs have higher sound absorption coefficients in the large frequency range and more sound absorption coefficient peaks in a specific frequency range than UPCs and DSPCs. In particular, the sound absorption coefficients of the CGPC with a porosity of 0.6 and thickness of 30 mm are higher than 0.56 when the frequency is 1350–6300 Hz and are all higher than 0.2 in the studied frequency range (1000–6300 Hz). CGPCs are expected to have potential application in noise control, especially in the broad frequency and low-frequency ranges.

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Review in Sound Absorbing Materials

Cited by 167 publications

References 36 publications

Technical Note. Effect of Liner Characteristics on the Acoustic Performance of Duct Systems

Technical Note. Effect of Liner Characteristics on the Acoustic Performance of Duct Systems

A simple preparation method and characterization of epoxy reinforced microporous phenolic open-cell sound absorbent foam

Experimental study on the sound absorption characteristics of continuously graded phononic crystals

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