Effect of yarn winding tension on the Wool ComfortMeter value when testing yarns

Naebe, Maryam; McGregor, B. A.; Tester, David

doi:10.1177/0040517514537369

Cited by 2 publications

(2 citation statements)

References 20 publications

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“…Maryam Naebe tested three different levels of tension and analyzed the effect of yarn winding tension on the Wool Comfort Meter [10]. The results confirmed the significant effect of yarn tension on the Wool Comfort-Meter value of the yarn.…”

Section: Simulation and Experimentsmentioning

confidence: 66%

“…Yarn tension is a function of the winding velocity, and the tension is adjusted by changing the speed of the yarn. According to Maryam Naebe [10], we know that a smaller yarn tension result in, a better predictor of the fabric's Wool ComfortMeter value used in the yarn winding process. In addition, the tension of the string affects the nip dimensions and string diameter as the yarn stretches [11,12].…”

Section: Introductionmentioning

confidence: 99%

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Microtension control for a yarn winding system with an IMC PID controller

Wang

et al. 2019

Mechanics & Industry

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In this paper, feedforward compensation and an internal model control (IMC) PID tuning method to maintain the yarn tension within a micro-boundary range are proposed. The proposed method can be used to improve the quality of products in textile industry. We first develop a mathematical model of the AC servo motor and yarn tension system. Based on the results of the mathematical model, an IMC PID controller is designed to control the microtension of the yarn. The proposed IMC-PID controller can be directly calculated from the time constant and time delay. Feedforward control is used to compensate for the linear velocity of the winding roller. To reduce the lateral vibrations of the yarn, we designed an active roller to nip the moving yarn. The active roller compensates for the variation in the diameter of the unwinding roller. The proposed method effectively improves the dynamics performance and the robustness of the system, and is appropriate for industrial application. Experimental instruments, including a tension sensor, an AC servo motor and a motion controller, equipped with a computer, are used to test the proposed method. The simulation and experimental results show the effectiveness of the proposed controller for the yarn microtension control system.

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Section: Simulation and Experimentsmentioning

confidence: 66%

Section: Introductionmentioning

confidence: 99%

Microtension control for a yarn winding system with an IMC PID controller

Wang

et al. 2019

Mechanics & Industry

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show abstract

Computer vision for yarn microtension measurement

Wang¹,

Lu²,

Huang³

et al. 2016

Appl. Opt.

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Yarn tension is an important parameter for assuring textile quality. In this paper, an optical method to measure microtension of moving yarn automatically in the winding system is proposed. The proposed method can measure microtension of the moving yarn by analyzing the captured images. With a line laser illuminating the moving yarn, a linear array CCD camera is used to capture the images. Design principles of yarn microtension measuring equipment based on computer vision are presented. A local border difference algorithm is used to search the upper border of the moving yarn as the characteristic line, and Fourier descriptors are used to filter the high-frequency noises caused by unevenness of the yarn diameter. Based on the average value of the characteristic line, the captured images were classified into sagging images and vibration images. The average value is considered a sag coordinate of the sagging images. The peak and trough coordinates of the vibration are obtained by change-point detection. Then, according to axially moving string and catenary theory, we obtain the microtension of the moving yarn. Experiments were performed and compared with a resistance strain sensor, and the results prove that the proposed method is effective and of high accuracy.

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Effect of yarn winding tension on the Wool ComfortMeter value when testing yarns

Cited by 2 publications

References 20 publications

Microtension control for a yarn winding system with an IMC PID controller

Microtension control for a yarn winding system with an IMC PID controller

Computer vision for yarn microtension measurement

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