| 摘 要: 为了提高非接触式纱线张力测量的速度和精度,提出了一种基于归一化互相关法(Normalized CrossCorrelation,NCC)的图像处理方法实现纱线张力的实时测量。基于弦振动理论得出纱线谐振频率与纱线张力之间的关系,利用NCC模板匹配算法提取纱线振动位移得出纱线时变曲线,使用傅立叶变化将时域关系转换为频域关系,通过对比纱线振动频率的理论值和测量值得到该测量系统的精确值。研究表明:文章提出的测量方法实现了纱线张力的实时测量,该方法得出的测量值与理论值之间的绝对误差均小于10%,属于测量误差范围内,并且处理速度快,实现了纱线张力的非接触式实时动态测量。 |
| 关键词: 纱线振动;纱线张力;非接触式纱线张力测量;图像处理;NCC模板匹配 |
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中图分类号: TP393.2
文献标识码: A
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| Design of Yarn Tension Measurement System Based on Image Processing |
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PENG Laihu1,2, JIANG Jing1
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(1.Zhejiang Sci-Tech University, Hangzhou 310000, China;
2.Longgang Research Institute, Zhejiang Sci-Tech University, Wenzhou 325000, China)
laihup@zstu.edu.cn; 202020601021@zstu.edu.cn
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| Abstract: In order to improve the speed and accuracy of non-contact yarn tension measurement, this paper proposes an image processing method based on Normalized Cross Correlation (NCC) to achieve real-time measurement of yarn tension. Based on the theory of string vibration, the relationship between yarn resonance frequency and yarn tension is obtained. NCC template matching algorithm is used to extract the yarn vibration displacement and obtain the yarn time-varying curve. The Fourier transform is used to convert the time-domain relationship into the frequencydomain relationship. The accurate value of the measurement system is obtained by comparing the theoretical and measured values of yarn vibration frequency. Research has shown that the measurement method proposed in this paper achieves real-time measurement of yarn tension, and the absolute error between the measured values and the theoretical values obtained by this method is less than 10% , which is within the measurement error range. With fast processing speed, the proposed method realizes the non-contact real-time dynamic measurement of yarn tension. |
| Keywords: yarn vibration; yarn tension; non-contact yarn tension measurement; image processing; NCC template matching |
