应用弹簧-质点模型的双贾卡提花织物形变仿真

为改善双贾卡提花经编织物的结构形变仿真效果,在分析双贾卡织物线圈结构形变影响因素的基础上,建立了成圈型、压纱型和衬纬型线圈几何结构模型;在传统的弹簧质点模型基础上进行改进,取线圈根部作为质点,线圈之间的延展线为弹簧,根据双贾卡提花特点,针对压纱贾卡与衬纬贾卡设定虚拟质点,建立双套弹簧系统;根据牛顿第二定律和显式中点法,计算质点在二维平面的运动形态,从而确定线圈的偏移方向和偏移量;利用建立的弹簧-质点模型与力学分析模型在VC++语言下实现了双贾卡提花经编织物的二维静态仿真,通过实际样例与对应仿真效果对比,验证仿真方法。

Deformation simulation of double jacquard fabric using mass-spring model

A modified mass?spring model was proposed to improve the structural deformation simulation of double jacquard warp?knitted fabrics. Geometrical loops models, including stitch, fall?plate and inlay, were built first based on analyzing influencing factors and features of deformation. By modifying the conventional mass?spring model, root of the loop model was referred as a mass particle, and underlaps between stitches were regarded as different kinds of springs. According to characteritics of double jacquard fabrics, two sets of spring systems were built with an additional set of hypothetical mass particles, correspondingly for fall?plate and inlay jacquard structures. Particles′ resultant force, motion state and deformation were calculated with Newton Second law and explicit Euler method. With the present mass?spring models and mechanical analysis method, two?dimensional deformation simulation was realized via VC++, and then was proven by comparing real sample and simulation effect.