密度非均匀分布纬编针织物的变形预测及仿真

Deformation prediction and simulation of weft knitted fabrics with non-uniform density distribution

针对不同密度的纬编针织物组织结合形成的织物成品变形明显、成品效果预测难度大的问题,提出了一种密度非均匀分布的纬编针织物的变形预测及仿真方法。基于织物中不同密度成员织物组织的具体分布情况,提出了对应的织物弹簧-质点模型的初始状态的确定方法,在此基础上对质点进行受力分析并建立相应的力学微分方程,通过数值方法求解力学微分方程得到质点位置;基于二维Peirce线圈模型建立NURBS线圈模型,并确定曲线控制顶点和织物圈距、圈高的关系,进一步建立质点-控制点关联式;将质点受力偏移后的位置代入质点-控制点关联式,实现带有曲线线圈形态的密度非均匀分布的纬编针织物变形模拟;将织物仿真图与真实针织样品进行对比,结果表明仿真效果可靠。

Aiming at the problem of obvious deformation of the finished fabric formed by the combination of weft knitted fabric stitches of different densities and the difficulty in predicting the finished product effect,a deformation prediction and simulation method of the weft knitted fabrics with non-uniform distribution of density was proposed.Based on the specific distribution of different constituent fabric stitches in the fabric,the method of determining the initial state of the corresponding fabric spring-mass point model was employed,based on which the stress analysis of the mass point and the corresponding mechanical differential equations were established,and the position of the mass point was obtained by solving the mechanical differential equations numerically.The NURBS loop model was established based on the two-dimensional Peirce loop model,and the relationship between the control vertex and the fabric loop distance and height was determined to further establish the mass point-control point correlation equation.The position of the mass point after the force shift was substituted into the mass point-control point correlation equation to realize the deformation simulation of weft knitted fabrics with non-uniform density distribution of curved loop.The fabric simulation map was compared with the practical knitted fabrics,and the results show that the simulation effect is reliable.