Noise absorption by woven fabrics

Shoshani, Yoav; Rosenhouse, G.

doi:10.1016/0003-682x(90)90081-5

Cited by 48 publications

(41 citation statements)

References 1 publication

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“…Theoretical plot of a cotton fiber web when a is a function of I for different frequencies f. ' FIGURE 8. Theoretical plot of an acrylan fiber web when a is a function of I for different frequencies f. a gets a minimum value near 0 in a specific thickness l&dquo;,;&dquo; (e. 8., for f = 1000 Hz, Im;&dquo; ~ 3.6 cm). Comparisons of the calculated and measured noise absorption coefficients (NAC) for three fiber webs made from acrylic, cotton, and polyester are given, respectively, in Tables I, II, and III for different frequencies and thicknesses of the samples.…”

Section: Resultsmentioning

confidence: 99%

A Model for Calculating the Noise Absorption Capacity of Nonwoven Fiber Webs

Shoshani

Yakubov

1999

Textile Research Journal

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Nonwovens can be used as noise control elements for a wide range of applications. This paper suggests a numerical method for calculating their acoustic performance using the theory of Zwikker and Kosten on sound propagation through porous media. The results for nonwovens made from acrylic fibers, cotton, and polyester are in fair agreement with experimental findings. The model yields the noise absorption coefficients of fiber webs as a function of their thickness and porosity. This relationship might serve as a guideline for the optimal design of passive control components made of nonwovens.Nonwoven fiber webs can be considered as noise control elements for a wide range of applications, such as acoustic ceilings and barriers, carpets, and wall claddings [5,6,9,10]. Experimental studies indicate that the noise absorption and insulation'capacities of such elements are competitive with known sound-proofing materials [7]. However, the optimal design of acoustic assemblies made of textiles calls for a theoretical model with the power of predicting the noise absorption coefficients of the nonwoven medium as a function of its thickness, porosity, fiber content, and other intrinsic characteristics.Since the advent of the monumental work of Zwikker and Kosten [ I 1 ] on sound transfer through porous media, several models assuming some symmetry in fibrous material have been suggested. Dahl et al. t I ] examined materials made of cylindrically shaped fibers arranged in a batting, with the fibers primarily aligned parallel to the face of the batting. Lambert [3,4] developed a model for high porosity Kevlar consisting of long flexible fibers that are usually layered and display a pronounced resonant effect.Such approximations are inadequate for the random mixture of fibers and air pores in a nonwoven fiberweb. A more appropriate model was suggested by Dent [2], who elaborated on the theory of Zwikker and Kosten. According to his model, a nonwoven is composed of air and fiber phases that react differently with the sound wave. The mathematical solution of the basic equations indicates that there are two forward and two backward waves traveling through both phases of the fiber web. The objective of our paper is to use Dent's work to calculate the noise absorption coefficients of some nonwovens. Although our approach for solving the boundary value problem associated with this model is different than Dent's, it yields the same analytical results. Basic Equations and Boundary ConditionsIn.tis section, we review briefly the essentials of the Zwikk~.r and Kosten theory [ I I ] relevant to our discussion. We use Dent's notations here [2].Let ?~ and p~ be the densities of air and fiber per unit volume of the fiberweb, po and pp the densities of free air and polymeric material, and v~ and vf = 1 -vQ the volume fraction of air and fiber, respectively. Then p, v,,po and p~ = Vfpp.The two equations of motion for infinitesimal elements of fiber and air are, respectively (ignoring viscous forces), and where the subscripts a and f refer to th...

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Section: Resultsmentioning

confidence: 99%

A Model for Calculating the Noise Absorption Capacity of Nonwoven Fiber Webs

Shoshani

Yakubov

1999

Textile Research Journal

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“…Satyanarayana et al [4] carried out systematic work on natural fibres such as jute, coir and sisal and described the structure-property relationship of these fibres including fracture modes. Furthermore, the investigation done by Shoshani and Rosenhouse [5] determined the relationship between the noise absorption coefficients of a cover made of woven fabric and its intrinsic parameters like fiber content, cover factor, air gap between the fabric etc. Hanna and Kandil [6] have studied the absorption coefficient of sound absorbing curtain based on woven fabric.…”

Section: Green Materialsmentioning

confidence: 99%

Noise Control of Home Appliances — The Green Way

Fatima

Mohanty

2012

Noise & Vibration Worldwide

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Material used for noise control applications should possess good sound absorption and dampening properties. In this work, the authors have focused on noise control applications of novel material made of jute which is a readily available, cheap and biodegradable natural fiber. Based on physical, flammable and acoustical properties, jute felt shows good sound absorption properties which has been used for noise control in a domestic clothes dryer and a vacuum cleaner. The noise sources in these appliances were ranked by measuring their radiated sound intensity levels. An overall reduction of radiated noise levels of 6 dB and 10 dB were obtained in the domestic dryer and the vacuum cleaner, respectively, by using the developed jute felt.

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“…Thus they usually have to be draped with a woven textile. Some work has been done on the noise absorption properties of woven structures [7,8], but was based only on empirical investigation.…”

Section: Introductionmentioning

confidence: 99%

Sound absorbtion in knitted structures for interior noise reduction in automobiles

Dias

Monaragala²

2006

Meas. Sci. Technol.

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Reduction of interior noise in modern automobiles is an important issue in the automobile industry. Textiles are one solution, as they can provide passive sound absorption in upholstery, headliners and other interior parts. Nonwovens have also been used, but they have a lesser aesthetic appearance and drapability compared with woven and knitted structures, which can provide a 3D seamless fabric and have a pleasing appearance. In this paper we test the sound absorption of plain knitted fabrics and compare this with a theoretical model.

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Noise absorption by woven fabrics

Cited by 48 publications

References 1 publication

A Model for Calculating the Noise Absorption Capacity of Nonwoven Fiber Webs

A Model for Calculating the Noise Absorption Capacity of Nonwoven Fiber Webs

Noise Control of Home Appliances — The Green Way

Sound absorbtion in knitted structures for interior noise reduction in automobiles

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