| Summary: | 碩士 === 桃園創新技術學院 === 材料應用科技研究所 === 102 === Friction sound of the fabrics refers to the audible sound pattern caused by body movements when fabrics rubbing against themselves or other personal articles. In this study, the friction sound produced by PET/Nylon blends of circular knitting and by those of warp knitting was recorded by an automatic friction sound test equipment so as to analyze their frequency spectrum through Fast Fourier Transform. With the time-domain signals transformed into frequency domain signals, the Maximum Sound Amplitude of circular knitting and warp knitting was calculated through autoregressive formula so that correlations between Auto Regressive Coefficients of the sound and FAST mechanical properties could be assessed.
For further assessment, MSA was divided into four separate groups based on their average value and standard deviation, which indicated the frequency spectrum of circular knitting demonstrated in similar manner due to their similar fabric construction and fiber Component, whereas the frequency spectrum of warp knitting varied significantly due to noticeable variation in fabric construction and fiber Component. The correlations between the friction sound and its mechanical properties as well as between that and the FAST system were analyzed through stepwise regression in order to find out critical mechanical parameters of circular knitting and the warp knitting. The results show that critical mechanical parameters varied, to some degrees, with the FAST system mechanical properties. The compression performance, bending and stretching have considerable effect on the friction sound of circular knitting and warp knitting .
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