Acoustical characterisation of porous sound absorbing materials: a review

Egab, Laith; Wang, X.; Fard, Mohammad

doi:10.1504/ijvnv.2014.059634

Cited by 41 publications

(26 citation statements)

References 67 publications

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“…Thus, the knowledge of these parameters allows acoustic behavior to be modeled. These models may use parameters that are based on the definitions from the theory or experimental measurements [37]. Several techniques are, in fact, used to determine the experimental macroscopic parameters, as discussed in Ref.…”

Section: Cellular Foams: Modeling Of Acoustic Propertiesmentioning

confidence: 99%

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Thermal and Acoustic Numerical Simulation of Foams for Constructions

Caniato¹,

D’Amore²,

Kašpar³

2020

Foams - Emerging Technologies

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Cellular foams are widely employed as insulation materials, both thermal and acoustic, often in competition with traditional fibrous insulation material, e.g., rock wool. As for the acoustic and thermal properties, several models have been developed to predict acoustic properties of poroelastic materials, but they are usually applied to fibrous layers or polyurethane foams, whereas their application to new materials like complex cellular foams has not been assessed due to the different cell microstructures. There is a very strong interest both in industrial and academic in developing novel insulation materials; accordingly, the possibility of ideally designing the cellular foam microstructure to achieve desired acoustic performances appears a highly attractive target. The paper will first discuss the state-of-the-art acoustic and thermal models and their application to cellular foam materials. Then a novel sustainable alginate-based foam material will be analyzed as a case study, by focusing the aspects related to their microstructure and acoustic properties. For the derivation of an acoustic model, the determination of the parameters of Johnson-Champoux-Allard (JCA) acoustic model (tortuosity, viscous characteristic length, thermal characteristic length, porosity, and flow resistivity) was performed using five different forecasting methods, including traditional analytical model for fibrous materials as well as inverse procedure.

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Section: Cellular Foams: Modeling Of Acoustic Propertiesmentioning

confidence: 99%

“…Several techniques are, in fact, used to determine the experimental macroscopic parameters, as discussed in Ref. [37]; however, these measurements are not trivial and often time-consuming.…”

Section: Cellular Foams: Modeling Of Acoustic Propertiesmentioning

confidence: 99%

Thermal and Acoustic Numerical Simulation of Foams for Constructions

Caniato¹,

D’Amore²,

Kašpar³

2020

Foams - Emerging Technologies

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“…Being easily implementable and cheap makes them attractive as a preliminary measure for cabin noise control. As the discussion of a detailed theoretical background is beyond the scope of this paper, interested readers can refer to specialized literature for further perusal [Arenas and Crocker, 2010;Cox and D'Antonio, 2009;Egab et al, 2014].…”

Section: Sound Absorption Materialsmentioning

confidence: 99%

Acoustic Metamaterials: A Potential for Cabin Noise Control in Automobiles and Armored Vehicles

Ang

Koh²,

Lee

2016

Int. J. Appl. Mechanics

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The aim of this paper is to provide an overview of the existing industrial practices used for cabin noise control in various industries such as automotive, marine, aerospace, and defense. However, emphasis is placed on automobiles and armored vehicles. Generally, automobile cabins usually constitute of thin structural panels, where the fundamental frequency typically falls below 200[Formula: see text]Hz. If a specific structural mode couples with a specific acoustic mode of the cabin, booming noise occurs. As such, discomfort may be felt by the occupants. Fundamentally, vibroacoustics problems may be minimized if the acoustic modes and the structural modes are decoupled, which is achieved usually by structural modifications or acoustical treatments. However, if excessively performed, the weight limitation of an automobile design will be exceeded; not to mention the adverse effect of increased weight on several factors such as fuel efficiency, mileage life of tires and acceleration of the vehicle. Moreover, current solutions have several drawbacks in low frequency noise control. In light of this, it is of great interest to explore the feasibility of acoustic metamaterials as an alternative with hope to improve cabin noise.

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“…The long-term effect entails impaired human lifestyle. Previous studies have focused on some of the methods through which acoustic systems could be improved, especially among sound absorbing materials that aid in improving the quality of human life [1][2][3][4][5]. The extent to which the sound absorbing materials could absorb the sound form a major determinant of their categorization into various groups.…”

Section: Introductionmentioning

confidence: 99%

Sound Absorption Coefficient and Water Content Responses in Acoustic Analysis Based on Renewable Polyurethane Foam Composites

2019

IJITEE

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In physiological health, negative effects are felt when unwanted noise is present. Given the negative effects of the unwanted noise, it become important to examine how environmentally-friendly and efficient sound absorbing materials could be developed. Some of the materials associated with acoustic absorption properties entail polymer foams. Particularly, the foams aid in controlling noise. The central purpose of this study was to examine renewable polymer (PU) foam composites’ aspects of moisture content and acoustical properties. Four major parameters that were evaluated included the thickness of the sample, the type of filler, the ratio of the fillers, and the nature of the monomer. A design of experiment (DoE) technique was employed. To prepare the PUs foams, 28 mm and 100 mm were selected as diameters for the cylindrical shapes on focus. Plotting the main effects was achieved through ANOVA, upon which variations in the role and performance of the selected input factors were discerned. From the findings, it was established that when bio-epoxy (B) was used in conjunction with renewable PU foams, the moisture content was greater than the case involving petroleum based PU foam synthesis. Hence, renewable PU foam composite is seen to be realized at 0.9, especially if the filler ratios and size are increased; with the experimental conditions set at 3 kHz. Overall, the study established that the renewable Pus’ state of sound absorption exhibits good agreement with the case of synthetic PU foam.

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Acoustical characterisation of porous sound absorbing materials: a review

Cited by 41 publications

References 67 publications

Thermal and Acoustic Numerical Simulation of Foams for Constructions

Thermal and Acoustic Numerical Simulation of Foams for Constructions

Acoustic Metamaterials: A Potential for Cabin Noise Control in Automobiles and Armored Vehicles

Sound Absorption Coefficient and Water Content Responses in Acoustic Analysis Based on Renewable Polyurethane Foam Composites

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