Frequency Analysis of Frictional Force Patterns of Fabrics

Frictional force patterns of shingosen were measured by KES-SE frictional force measurement system. Power spectra of the frictional forces were obtained by FFT method. The power spectra denoted that the vibrational components of the frictional forces can be divided into two groups. One group was related to the density of yarn and the other was related to the. spacing of piano wires on the surface of the probe. It was found that the former components decrease and the latter components increase with increasing randomness of spacing of yarns by a calculation with a simple model of interaction between a friction probe and fabrics. These vibrational components had various intensity and formed a characteristic spectrum pattern in each sample. Some relation were observed qualitatively between the spectrum patterns of frictional force and the handles of the fabrics. Then it was suggested that the frequency analysis of the frictional force can be used as ameasuring method by which the subtle differences in frictional properties among shingosen fabrics can be detected.