Physiological signal analyses of frictional sound by structural parameters of warp knitted fabrics |
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| Authors: | Gilsoo Cho Chunjeong Kim Jayoung Cho Jiyoung Ha |
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| Institution: | (1) Department of Clothing and Textiles, Yonsei University, 120-749 Seoul, Korea |
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| Abstract: | The purpose of this study is to offer acoustical database of warp knitted fabrics by investigating frictional sound properties
and physiological responses according to structural parameters such as construction, lap form, and direction of mutual guide
bar movement. Fabric sounds of seven warp knitted fabrics are recorded, and Zwicker’s psychoacoustic parameters — loudness(Z),
sharpness(Z), roughness(Z), and fluctuation strength(Z) — are calculated. Also, physiological responses evoked by frictional
sounds of warp knitted fabrics are measured such as electroencephalogram (EEG), the ratio of high frequency to low frequency
(HF/LF), respiration rate (RESP), skin conductance level (SCL), and photoplethysmograph (PPG). In case of constructions, frictional
sound of sharkskin having higher loudness(Z) and fluctuation strength(Z) increases RESP. By lap form, open lap has louder
and larger fluctuating sound than closed lap, but there aren’t significant difference of physiological responses between open
lap and closed lap. In direction of mutual guide bar movement, parallel direction evokes bigger changes of beta wave than
counter direction because of its loud, rough, and fluctuating sound. Fluctuation strength(Z) and roughness(Z) are defined
as important factors for predicting physiological responses in construction and mutual guide bar movement, respectively. |
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| Keywords: | Frictional sound Physiological response Physical sound property Psychoacoustic parameter Warp knitted fabric |
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