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- 저자 : 우제린 ( Jae Lin Woo ) (검색결과 5 건)
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로울 드래프트에서의 슬라이버 동적거동의 동정 (I)-동적모델의 구조확인-
허유,우제린,Huh, You,Woo, Jae-Lin 한국섬유공학회 1993 한국섬유공학회지 Vol.30 No.7
The drawing process in staple yarn manufacturing has the object to increase the regularity of sliver linear density on the basis of the probability by doubling and to improve the orientation of fibers along the sliver axis. This process plays an important role in the quality of the spun yam, because the drawn sliver has no more opportunity to improve the regularity in the next processes in spinning. Therefore new drawing frames are equipped with automatic sliver irregularity control system which is called autoleveller. But an optimal control needs the dynamic characteristics which can be expressed in the form of a mathematical model. For identification of dynamic characteristics, the structure of the model must be known. In this study, it is attempted to ascertain the structure of the mathematical model of the dynamic characteristics of drawing which is not revealed yet. As results can be shown that 1) for the on-line measurement of the sliver irregularity, a leafspring with strain gauge has functioned electively, 2) the characteristics of the output sliver linear density for the input sliver could be expressed in the form of a proportional derivative system with time delay of the 1st order, where the behavior of the output sliver linear density to the draft ratio change in the form of a proportional system with time delay of the 1st order.
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제직시스템에서의 속도변화에 대한 위사밀도의 동적 응답 (I)
허유,류운영,우제린,Huh, You,Ryu, Woon-Young,Woo, Jae-Lin 한국섬유공학회 1991 한국섬유공학회지 Vol.28 No.11
Factors affecting fabric quality are yarn, weaving machine and men. Among them the weaving machine and men can be controlled in the weaving Process. Most of fabric defects result from the yarn, the weak points of which cause the discontinuities in the machine operation responsible for the endbreakages. The interruption in production can be reduced by an optimal operation of weaving machines, but the cause of endbreakages can not be completely eliminated. The places where the machine stopped and restarted leave streaks on the fabrics, which result in the fabric defects. These defects, so called stop marks, lead to the irregularity of weft density This paper deals with relationship between the change in weft density and the weaving interruption. The weft density change, the stop mark, was measured in terms of pickspacing and the mode of weaving interruption determined by applying different forms of speed variations. The results show that the weft density change is mostly influenced by the rate of speed variation. The initial loading on the warp yarns is independent of the total weft density change, but it is responsible for the distribution of the weft density irregularity.
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장력 On-line계측의 사절 현상 해석에의 응용-단경사 장력 최대치의 분포-
김선욱,허유,우제린,Kim, Sun-Wook,Huh, You,Woo, Jae-Lin 한국섬유공학회 1990 한국섬유공학회지 Vol.27 No.12
The yarn tension during weaving process has a significant influence on the product quality and production efficiency of woven fabric. On considering the yarn breakage rate in weaving, the analysis and prediction of yarn tension are very important. Pattern of variation in warp tension, at a given location on loom, with time under a certain specific boundary condition provides a vital piece of information for the analysis of yarn breakage rates. In the present work, variation in yarn tension was measured on a group of warp during weaving, and an attempt was made to extract some information on the variation of the extreme tension acting on the single warp yarns from the experimental results. From the experiments and loading model for a yarn group, it can be concluded that the ergodicity of warp yarn tension in weaving process is unlikely to be valid. The tension peak with respect to time has the characteristics of the normal distribution, while the tension on the ensemble basis has shown to be the Weibull distibution.
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초기조건으로 직전위치에 대한 위사간격의 자유응답 - 이론적 모델과 시뮬레이션-
허유,류운영,우제린,Huh, You,Ryu, Woon-Young,Woo, Jae-Lin 한국섬유공학회 1992 한국섬유공학회지 Vol.29 No.9
The quality of woven fabrics is deeply affected by the regularity of warp and weft density, which is one of the fundarnental fabric pararneters determining the physical properties of fabrics. In particular the regularity of weft density can be easily destroyed in a transient or unstable processing state, for example: when weaving process is interrupted by a disturbance or in the case of article change. In most cases, a reruning of the weaving machine leaves a fabric fault in the form of streaks which caused by the irregularity of weft density. This fault is called "stop mark" and is nowadays one of the most frequently occurring errors in fabrics. In this study, it was tried to analyze the mechanism how a stop mark takes place and to obtain a theoretical model. During modelling, it was proposed that the latest pickspacing can be affected by the beating motion which build up a new pickspacing as a result of new weft insertion. The mathematical model has shown a nonlinear simultaneous difference equation system which consists of equations about the pickspacing and clothfell position. The results of simulation revealed that forward movement of dothfell position has a sensitive effect on occurrence of dense weft streaks. The backward movement of clothfell position, however, brought about a broad and thick weft streaks.t streaks.
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