This paper describes the old and the new loop length mathematical models of Hot Rolling Mill of Wuhan Iron and Steel Co.

介绍武钢热轧厂活套高度控制系统更新前和更新后的套量数学模型，详细分析了更新后系统的套量计算方法和优点。

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Both loop length and fabric structure influence the stitch density, the thickness and the loop morphological structure of a fabric.

线圈长度、组织结构都对织物的密度、厚度、线圈形态有影响。

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Based on the mechanical analysis, the equation between stress and loop length is set up, and it is proved by testing result of kitted fabrics with different stitch densities.

针织物受力时产生起拱变形现象，通过力学和数学分析，建立了力与线圈长度的关系式。

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Based on the mechanical analysis, the equation between stress and loop length is set up, and it is proved by testing result of kitted fabrics with different stitch densities.

针织物受力时产生起拱变形现象，通过力学和数学分析，建立了力与线圈长度的关系式。

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