The Spectral Distribution of Sound Produced by Fibers and Fabrics in Friction

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Abstract
New instrumentation, described in Part I, has made possible the accurate measure ment o sound spectra produced by fibers or fabrics in friction. Such spectra contain information related to many properties of these materials, and changes in these prop erties are reflected in changes in the sound spectrum produced. Increased fabric wrinkledness, fuzziness, and harshness, with certain exceptions, produce increases in sound intensities. Loose fine fibers produce less sound than coarse fibers. Highly crimped fibers in a fabric produce less sound than those with little crimp, and this is accompanied by increased fabric softness and flexibility. A converse effect of crimp on sound intensities is observed with loose fibers or sliver. In a fabric, fiber blend, yam twist, and textile mechanical and chemical processing are reflected in the sound spectrum generated in a manner which depends on the physical properties of component structural elements.

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