Journal of Textile Research ›› 2021, Vol. 42 ›› Issue (01): 96-102.doi: 10.13475/j.fzxb.20200404007

• Dyeing and Finishing & Chemicals • Previous Articles     Next Articles

Measurement method of winding density of cheese package based on laser scanning and modeling

ZHOU Qihong1,2(), SUN Baotong2, CEN Junhao3, ZHAN Qichen2   

  1. 1. Engineering Research Center of Advanced Textile Machinery, Ministry of Education, Donghua University,Shanghai 201620, China
    2. College of Mechanical Engineering, Donghua University, Shanghai 201620, China
    3. Guangzhou Seyounth Automation Technology Co., Ltd., Guangzhou, Guangdong 511400, China
  • Received:2020-04-16 Revised:2020-09-04 Online:2021-01-15 Published:2021-01-21

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Abstract:

In order to meet the requirement of intelligent high-quality dyeing, and solve the problems of poor accuracy, low efficiency and unsatisfactory digital management and control in winding density measurement of cheese yarn packages, a method for measuring the winding density of cheese packages was proposed based on the rapid scanning of laser displacement sensors for data collection and for establishing a mathematical model. By controlling the sampling distance and scanning path and range, the original point set reflecting the texture characteristics and the trace of the yarn in the cheese package was obtained. Based on the characteristics of different noise points and statistics theory, constraints were added to the original point set for preprocessing. After the point set was treated using the least square fitting and rotating surface equation, a high-precision mathematical model of the surface profile of the cheese yarn package was constructed, and the volume of the yarn was obtained through triple integration so as to calculate the accurate winding density. The experimental results show that the relative error of measurement can be controlled within 2.5%, the standard deviation is 0.069%, the efficiency is high, and the performance is obviously better than the existing methods in the industry.

Key words: cheese package, winding density, laser measurement, mathematical modeling, data noise reduction, intelligent dyeing factory

CLC Number: 

  • TS19

Fig.1

Digital scanning device for cheese."

Fig.2

Flow chart for automatic measurement of winding density of cheese yarn"

Fig.3

Original point lumped map"

Fig.4

Details of original point set"

Fig.5

Sample diagram. (a)Sample a; (b) Sample b"

Tab.1

Data at junction of bobbin point, coincidence point and modeling point in original point concentration"

上激光位移传感器(U-LDS) 下激光位移传感器(D-LDS) 侧面激光位移传感器(S-LDS)
距离
(x值)/cm		 测量值
(z值)/cm		 差值/
cm		 距离
(x值)/cm		 测量值
(z值)/cm		 差值/
cm		 距离
(z值)/cm		 测量值
(x值)/cm		 差值/
cm
需
处
理
的
数
据		 2.588 1.402 1.428 2.577 -15.484 0.224 -2.477 9.662 -0.056
2.687 -0.026 -0.014 2.677 -15.708 4.102 -2.577 9.718 -0.084
2.787 -0.012 0.700 2.777 -19.810 -3.234 -2.676 9.802 -0.070
2.887 -0.712 0.028 2.877 -16.576 0.182 -2.776 9.872 -0.056
2.987 -0.740 0.070 2.977 -16.758 -0.028 -2.876 9.928 -0.028
3.087 -0.810 0.630 3.077 -16.730 -0.882 -2.976 9.956 -0.014
3.186 -1.440 -0.112 3.176 -15.848 0.084 -3.076 9.970 -0.056
有
效
数
据		 3.286 -1.328 0.042 3.276 -15.932 0.042 -3.175 10.026 -0.014
3.386 -1.370 -0.014 3.376 -15.974 -0.014 -3.275 10.040 0.028
3.486 -1.356 -0.028 3.476 -15.960 0.028 -3.375 10.012 0.000
3.586 -1.328 -0.014 3.575 -15.988 0.014 -3.475 10.012 -0.014
3.685 -1.314 0.000 3.675 -16.002 0.014 -3.574 10.026 0.000
3.785 -1.314 -0.042 3.775 -16.016 0.028 -3.674 10.026 -0.028
3.885 -1.272 -0.014 3.875 -16.044 0.000 -3.774 10.054 0.014
3.985 -1.258 0.014 3.975 -16.044 -0.014 -3.874 10.040 -0.014
4.085 -1.272 0.000 4.074 -16.030 0.000 -3.974 10.054 0.028
4.184 -1.272 -0.014 4.174 -16.030 0.000 -4.073 10.026 0.014

Fig.6

Histogram of probability distribution of difference. (a) Histogram of original probability distribution; (b) Probability histogram after threshold segmentation"

Fig.7

Modeling diagram. (a)Set of points after preprocessing; (b) Schematic diagram of curve after fitting"

Tab.2

Experimental comparison results of current industry methods with those in this paper"

样品
编号		 样品的卷绕密度精确值/
(g·cm-3)		 本文方法 行业通用方法
卷绕密度/(g·cm-3) 相对误差/% 卷绕密度/(g·cm-3) 相对误差/%
a 3.61×10-1 3.687×10-1 2.13 3.349×10-1 7.23
b 4.11×10-1 4.066×10-1 1.07 3.821×10-1 7.03

Tab.3

Repeated measurement data of same sample"

测量序号 卷绕密度/(g·cm-3) 测量序号 卷绕密度/(g·cm-3)
1 3.689×10-1 6 3.694×10-1
2 3.700×10-1 7 3.694×10-1
3 3.679×10-1 8 3.683×10-1
4 3.697×10-1 9 3.688×10-1
5 3.698×10-1 10 3.697×10-1
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