Sound absorption analysis of thermally bonded high-loft nonwovens

Süvari, Fatih; Ulcay, Yusuf; Pourdeyhimi, Behnam

doi:10.1177/0040517515590412

Cited by 22 publications

(19 citation statements)

References 15 publications

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“…Thus, for high GSM fabrics (samples A, B and C) there are more fibers involved in the viscous losses and more acoustic energy is dissipated in the form of heat energy. 20,40 In the case of similar thickness (samples D, E, F and G), the increase of fabric GSM leads to an increase in airflow resistance. Since the flow resistance is less than the optimum, the sound absorption performance tends to increase as well.…”

Section: Sound Absorptionmentioning

confidence: 99%

Acoustic evaluation of Struto nonwovens and their relationship with thermal properties

Yang

Xiong

Mishra

et al. 2016

Textile Research Journal

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This paper presents an experimental investigation on the sound absorption behavior and thermal properties of Struto nonwovens by establishing relationship between these properties. Seven Struto nonwoven fabrics were selected to examine the noise reduction coefficient (NRC) and average values of sound absorption coefficients (αtrue¯) as well as thermal properties, including thermal conductivity and thermal resistance. The Brüel and Kjær impedance tube instrument and Alambeta were used for the evaluation of acoustic and thermal properties, respectively. The influence of structural parameters on acoustic and thermal properties of Struto nonwovens were investigated and analyzed. The results showed that Struto nonwovens with higher thickness, finer fibers and higher fabric grams per square meter can provide better sound absorption performance. The effect of specific airflow resistance on sound absorption performance was also investigated. It is observed that sound absorption performance has a strong correlation with specific airflow resistance. The effect of porosity on specific airflow resistance and thermal properties was studied in detail. The result indicated that porosity has a strong correlation with specific airflow resistance and thermal properties. It was also observed that sound absorption, the NRC and αtrue¯ have an insignificant correlation with thermal conductivity, while they are strongly correlated with thermal resistance. The correlation coefficient of the NRC with thermal resistance is 0.9835, indicating that the NRC is directly proportional to the thermal resistance of Struto nonwovens.

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Section: Sound Absorptionmentioning

confidence: 99%

Acoustic evaluation of Struto nonwovens and their relationship with thermal properties

Yang

Xiong

Mishra

et al. 2016

Textile Research Journal

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show abstract

“…Thus, for high areal density samples there are more fibers involved in the viscous losses and more acoustic energy is dissipated in the form of heat energy. 20 In the case of similar thickness, the increase of fabric areal density leads to an increase in sound absorption performance. Based on this analysis, by comparing SAC of samples A, B, C, A1, B1, and C2, it is hard to conclude that samples produced by rotating perpendicular lapper have better sound absorption performance.…”

Section: Resultsmentioning

confidence: 99%

“…The reason for this phenomenon can be sample thickness and areal density differences. [19][20] Nonwoven thickness is a very important factor determining the sound absorption ability. Generally, the increase of thickness results in an increase of SAC at the low-frequency range.…”

Section: Sound Absorption Propertiesmentioning

confidence: 99%

Sound absorption and compression properties of perpendicular-laid nonwovens

Yang

Xiong

Mishra

et al. 2018

Textile Research Journal

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This study presents an investigation into the sound absorption behavior and compression properties of perpendicular-laid nonwovens. Seven types of perpendicular-laid nonwovens produced by vibrating and rotating perpendicular lappers were selected. Nonwovens with varying thickness and areal density were prepared by the heat-pressing method to investigate the effect of structural parameters such as thickness and areal density on sound absorption ability. Measurements of sound absorption properties were carried out with a Brüel and Kjær measuring instrument. The effect of manufacturing techniques on sound absorption performance and compression properties was investigated. The effect of porosity on sound absorption ability was studied. The influence of density and fiber orientation angle on compression properties was analyzed. The results show that samples prepared by vibrating perpendicular lapper exhibit better compression properties, whereas there is no significant influence of two manufacturing techniques on sound absorption performance. The increase of areal density results in improvement in the sound absorption ability. The increase of thickness can improve the sound absorption coefficient in the low-frequency range, but decrease of the coefficient occurred in the high-frequency range. A quadratic relationship between porosity and sound absorption ability has been found. The results also show that compressional resistance has a strong relation with density – the correlation coefficient is 0.95, indicating that the compressional resistance is directly proportional to the density of perpendicular-laid nonwovens. The results indicate that the perpendicular-laid nonwovens with higher initial fiber orientation angle have better compression properties.

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“…High-loft nonwoven panel is known to have useful acoustic properties [ 14 ]. Although some studies related to the acoustic properties of this material can be found in the literature [ 14 , 15 ], there is a lack of research on recovered non-acoustic parameters via inverse method for this type of material. Moreover, there are only a few publications focusing on characterization of the homogeneity of nonwoven panels.…”

Section: Introductionmentioning

confidence: 99%

Characterization on Polyester Fibrous Panels and Their Homogeneity Assessment

et al. 2020

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Nowadays, fibrous polyester materials are becoming one of the most important alternatives for controlling reverberation time by absorbing unwanted sound energy in the automobile and construction fields. Thus, it is worthy and meaningful to characterize their acoustic behavior. To do so, non-acoustic parameters, such as tortuosity, viscous and thermal characteristic lengths and thermal permeability, must be determined. Representative panels of polyester fibrous material manufactured by perpendicular laying technology are thus tested via the Bayesian reconstruction procedure. The estimated porosity and airflow resistivity are found in good agreement with those tested via direct measurements. In addition, the homogeneity of polyester fibrous panels was characterized by investigating the mean relative differences of inferred non-acoustic parameters from the direct and reverse orientation measurements. Some parameters, such as tortuosity, porosity and airflow resistivity, exhibit very low relative differences. It is found that most of the panels can be assumed homogeneous along with the panel thickness, the slight inhomogeneity mostly affecting the thermal characteristic length.

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Sound absorption analysis of thermally bonded high-loft nonwovens

Cited by 22 publications

References 15 publications

Acoustic evaluation of Struto nonwovens and their relationship with thermal properties

Acoustic evaluation of Struto nonwovens and their relationship with thermal properties

Sound absorption and compression properties of perpendicular-laid nonwovens

Characterization on Polyester Fibrous Panels and Their Homogeneity Assessment

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