Journal of Textile Research ›› 2021, Vol. 42 ›› Issue (09): 163-169.doi: 10.13475/j.fzxb.20201202807

• Machinery & Accessories • Previous Articles     Next Articles

Design of dynamic tension compensation system for warp knitting let-off based on model predictions

ZHENG Baoping, JIANG Gaoming(), XIA Fenglin, ZHANG Aijun   

  1. Engineering Research Center for Knitting Technology, Ministry of Education, Jiangnan University, Wuxi, Jiangsu 214122, China
  • Received:2020-12-10 Revised:2021-06-08 Online:2021-09-15 Published:2021-09-27
  • Contact: JIANG Gaoming E-mail:jgm@jiangnan.edu.cn

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Abstract:

In order to control the yarn dynamic tension compensation, warp knitting machines are required to control the variation of tension values in different angles in a cycle of knitting process. In view of the defects associated with controlling the let-off of warp beam, such as excessive yarn tension fluctuation and difficulty in accurate control of yarn tension with different angles in a row, a warp knitting let-off dynamic tension compensation system based on model prediction has been developed. To faclitate the yarn dynamic tension compensation control, a hardware and software platform of the system was designed, tension sensors were selected and optimized, algorithm for determining the electronic cam programming profile and the control algorithm for model prediction were created, on the basis of analyzing the movement law of the winding mechanism of the warp knitting machine. Through theoretical analysis and experimental validation, the control algorithm of model prediction is found to reduce the yarn tension peak value by at least 56% by analyzing the feedback yarn dynamic tension curve.

Key words: warp knitting machine, dynamic tension compensation, tension sensor, electronic cam, control algorithm

CLC Number: 

  • TS183.92

Fig.1

Yarn tension fluctuation curve in a weaving cycle of spindle"

Fig.2

Control principle of yarn dynamictension compensation system"

Fig.3

Yarn path of dynamic tension compensation system"

Fig.4

Upper man-machine interaction of let-off dynamic tension compensation control system"

Tab.1

Calibration and precision index of tension sensor"

砝码质量/g 输出电压/V 输出电压变化率/(V·g-1)
0 1.68 —
10 2.14 0.046 0
20 2.60 0.046 0
40 3.51 0.045 7
50 3.96 0.045 6
60 4.43 0.045 8
90 5.80 0.045 8
100 6.26 0.045 8

Fig.5

Quintic polynomial programming curves for angular displacement (a), angular velocity(b) and angular acceleration(c)"

Tab.2

Hardware names and functions of test platform"

硬件名称 数量 功能
HKS4 EL经编机 1台 主机结构
上位机控制系统 1套 人机交互、控制
固高运动控制卡 1套 运动控制器
多摩川伺服系统 1套 控制及执行机构
张力传感器 1套 纱线张力值测试
LMS振动测试仪 1台 采集纱线张力值曲线

Tab.3

Peak tension comparison of no dynamic compensation and dynamic compensation at different speeds"

主轴转速/
(r·min-1)		 无张力补偿
峰值/N		 有张力补偿
峰值/N		 峰值降低
率/%
1 100 0.176 0.075 57.4
1 300 0.180 0.070 61.1
1 500 0.198 0.087 56.1

Fig.6

Yarn tension curves at different speeds"

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