Sound characteristics according to cross-sectional shapes of fibers

Zhong

Textile Research Journal

2011

It is an important topic to characterize the cross-sectional shape of profiled fiber for quality control of textiles and performance design. In this paper, we propose a new measure of the shape factor, which can be used to characterize the cross-sections of profiled fibers. Different from the existing indices of the shape factor which are based on the ratio of the radii of circumscribed and inscribed circles, the proposed measure uses the shape information residing in the boundary of profiled fiber cross-sections. It is defined as the coefficient of variation of the area sequence in the cross-sectional plane at each angular interval. The capacity of this measure is validated by various examples, which also indicates that the defined measure can distinguish the discrepancy degree between fiber cross-section and the area equivalent circle. It is robust and applicable to any arbitrary shape with solid cross-section, no matter whether it is convex or concave.

“…Furthermore, is very sensitive to the change of the perimeter due to the presence of deep depressions in cross-sectional shapes (e.g., No. 5,No. 10,No.…”

Section: Experiments Illustrating CV R2 Behaviormentioning

confidence: 96%

“…If the same shapes are ranked with respect to , a different ranking 1,2,9,6,13,15,7,8,16,11,4,3,22,12,20,17,14,10,18,19,24,5,21,23 is obtained. Especially for multi-leaf shapes No.…”

Section: Experiments Illustrating CV R2 Behaviormentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A new shape factor measure for characterizing the cross-section of profiled fiber

Zhong

Textile Research Journal

2011

Journal of the Korean Society for Clothing Industry

“…Fluctuation strength(z)는 4.2~5.3 vacil 사이의 값을 가졌으며( Fig. 3(d) (Kim et al, 2003), 편성물은 0.4~0.9 vacil의 값을 가졌다 (Cho, 2005). 태권 도 도복 직물의 변동 강도는 다른 직물보다 월등히 높은 값을 보여 마찰음이 더 변화롭게느껴짐을 알 수 있었다.…”

Section: 서 론unclassified

Sound Characteristics and Mechanical Properties of Taekwondo Uniform Fabrics

Jin¹,

Cho²

2012

This study examined the sound characteristics of Taekwondo uniform fabrics to investigate the relationship between the sound parameters and the mechanical properties of the fabric as well as to provide the conditions to maximize the frictional sound of the uniform. Frictional sounds of 6 fabrics for Taekwondo uniforms were generated by the Simulator for Frictional Sound of Fabrics. The frictional speeds were controlled at low(0.62 m/s), at mid(1.21 m/s) and at high(2.25 m/s) speed, respectively. The frictional sounds were recorded using a Data Recorder and Sound Quality System subsequently, the physical sound properties such as SPL(Sound Pressure Level) and Zwicker's psychoacoustic parameters were calculated. Mechanical properties of specimens were measured by KES-FB. The SPL, Loudness(Z) values increased while Sharpness(Z) value decreased. In the physical sound parameter, specimen E had the highest SPL value at low speed and specimen B at high speed. In case of Zwicker's psychoacoustic parameters, the commercially available Taekwondo uniform fabrics(E, F) showed higher values of Loudness(Z), Sharpness(Z), and Roughness(Z), that indicates they can produce louder, shaper and rougher sounds than other fabrics for Taekwondo uniforms. The decisive factors that affected frictional sounds for Taekwondo uniforms were W(weight) as well as EM(elongation at maximum load) at low speed and WC(compressional energy) at high speed.

“…The fabric noise has been analyzed by cross-sectional shapes of fibers, fiber type, and weaves to calculate objective factors affecting them [6][7][8]. In addition, the subjective sensations and the physiological responses to fabric sounds have been reported [9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Characteristics of sounds generated from vapor permeable water repellent fabrics by low-speed frictions

2008

Self Cite

To investigate the sound properties by low-speed frictions (0.2 m/s and 0.5 m/s) which occur when two fabrics are rubbed by wearer's slow movement, six specimens are selected by cluster analysis among seventy-one vapor permeable water repellent fabrics for outdoor sportswear. Their sound spectra are obtained from the FFT analysis. Physical sound properties (LPT, ΔL, Δf) and Zwicker's psychoacoustic parameters -loudness(Z), sharpness(Z), roughness(Z), and fluctuation strength(Z) -are calculated from the sound spectra. Mechanical properties of the fabrics are measured with the KES-FB system. The amplitudes of the sound spectra of all the specimens at 0.5 m/s are higher than those at 0.2 m/s throughout the entire range of frequencies. As the frictional speed changed from 0.2 m/s to 0.5 m/s, the LPT increases about 16 dB, and the loudness(Z) and fluctuation strength(Z) increase about 3 times and 2 times, respectively. The SMD and Weight at the two low frictional speeds are the important factors which affect the sound properties of vapor permeable water repellent fabrics.