Sound absorption of weft knitted fabrics: influence of fibers cross-section shape, stitch density and mechanical modification of surface

Abstract

PurposeOne of the recent applications of fabrics is to use them for sound insulation. Accordingly, due to their low production cost and low relative density, fabrics have drawn attention in some of the industries such as the automotive and aircraft industries. The present study is aimed to investigate the effects of the fiber cross-section, porosity, thickness of samples and fuzzing of the knitted fabric on the sound absorption coefficient.Design/methodology/approachIn the present study, fabrics with three different stitch densities were knitted by yarns consist of three different forms of fiber cross-section shapes (circular, elliptical and plus-shaped). In this work, the sound absorption coefficient of knitted fabrics was investigated with regard to the different fiber cross-sections and structural parameters using an impedance tube.FindingsAs indicated by the obtained results, the cross-section, porosity, thickness and mass per unit area of the fabrics were the determinant factors for the sound absorption coefficient. In addition to, the sound absorption coefficient and porosity were shown to have an inverse relationship.Originality/valueA section of the present paper has been allocated to the investigation of the effect of the fiber cross-section and fuzzing of fabric on the sound absorption of plain knitted fabrics.

Acoustic 3d spacer fabrics in the frame of acoustic materials: Limitations and potentialities comfort

“…Mohammad-Reza, Mehdi, Abosaeed, and Esmail [8] studied the influence of fibres cross-section shape, stitch density, and mechanical modification of surface on sound absorption of weft knitted fabrics. Fabrics with different stitch densities were knitted by yarns consisting of several fibre cross-section shapes.…”

“…Figure 6. Influence of cross-section shape on sound absorption coefficient for samples C (circular crosssection in blue RGB 180,199,231), D (elliptical crosssection, blue RGB 143,170,220) and E (plus-shaped cross-section in blue RGB 47,85,151) [8]. …”

A sound-absorbing and heat-insulating collagen fiber composite material

“…15 The skin collagen material has a small thickness and good air permeability, and part of the incident sound waves will pass through the air, which affects the sound insulation of the material. 40 The PHCC material is cured and cross-linked by PHM, and the microspheres are attached to the fiber surface and the gaps between the fibers, which increases the connection between the collagen fiber bundles and the layers so that the skin collagen material maintains flexibility and has an increased surface density, thereby increasing the air flow resistance. This also extends the time that the sound waves stay inside the material, resulting in the absorption of more sound energy.…”