棉纱拉伸性质的建模研究

Modeling the tensile property of cotton yarn

通过对纱线拉伸过程中应力-应变关系的分析,得到纱线具有蠕变、应力松弛现象以及非线性特征。为建立四元件模型,将标准线固体和非线性弹簧进行并联。从模型并联特性出发,采用泰勒公式,利用正交回归确定参数,获得了相应的理论曲线。建立了纱线测试试验台,该试验台采用LPC1768单片机对57BYGH 250C步进电机进行了精确位置控制,采用研华PCI1768数据卡进行了实时张力检测。在该试验台上,采用34.29 tex、45.45 tex、58.3 tex棉纱进行了实验测试,并通过多项式拟合,可以得到纱线实验曲线。研究结果表明,理论曲线与实验曲线基本一致(误差为±5%)。

After analysis of the tensile property curve,yams are born with creep,relaxation of stress phenomenon and non-lineal spring. In order to build the four-element model,the three-element model and the non-lineal spring were parallel connected. Based on the model features,yam theoretical curve was built with the Taylor formula and orthogonal polynomial regression analysis were used. The LPC1768 single chip microcomputer was used to control the 57BYGH250C step motor exactly while the PCI1768 data acquisition card was used to acquire real time data in the experiment platform. 34.29 rex,45.45 rex and58.3 rex cotton yarns were used to do experiments,the experiment curves were gotten based on polynomial fitting. The results indicate that the theory curve is consistent with exoeriment curve（error ＋5%）.