A Study on the Friction Sound of Nature Fiber Fabrics
| Autor: | Lin, Chun-Hao, 林君豪 |
|---|---|
| Rok vydání: | 2012 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 100 In this study, a set of automatic and manual friction sound test equipment has been designed to assess the fabric friction sound. In the process of assessment, the Fast Fourier Transform has been used to transform time-domain signals into frequency domain signals so as to obtain AR coefficient from autoregressive formula. Various kinds of equipment have been used to determine what kind of equipment is most suitable for assessing and reproducing fabric friction sound. The recording equipment and Sound Level Meter has been used to compare the sound recording. The results show in using recording equipment, the frequency spectrum is too similar to distinguish the difference among the different natural fiber fabrics in sound compression. A comparison of the differences between the friction sound in automatic and manual test equipment has also been conducted in this study. The two kinds of test equipment for the natural fiber fabrics are: classified frequency spectrum, reproducibility, t-test and ANOVA. In classification spectrogram, manual test equipment is not easily distinguishable from its spectrogram. In T-test and ANOVA the significant differences can be found in terms of reproducibility. Automatic test equipment is better than the manual friction sound test equipment. With regard to the fabric classification from the AR coefficient and the Maximum of Sound Amplitude and frequency spectrum, the changes in the frequency spectrum will be caused by the ARE and the ARF difference. In the classification, ARE and ARC have positive relationship to MSA, with MSA value being higher and the value of the ARE and ARC appearing high. Then through stepwise regression selection and analysis of critical mechanical parameters of fabric friction sound, the result shows that mechanical parameters of fabric friction sound has a key impact conspicuous in cotton fabric and bending (B) and surface properties (MMD) is relevant, linen fabric and tensile properties (RT) is relevant, silk fabrics and shear properties (2HG) is relevant, and wool fabric with stretch (WT) and the compression performance (WC) is relevant. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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