牵伸区浮游纤维动态行为的随机模拟

Stochastic simulation on dynamic behavior of floating fibers in roll drafting process

通过各种模拟手段得到牵伸区浮游纤维动态行为的规律是牵伸研究的重要内容之一。在考虑了牵伸纱条中纤维长度分布的情况下,利用前人提出的纤维变速点的抛物线密度函数族方法,模拟纱条在牵伸区变细曲线的随机状态,讨论了在不同纤维长度分布下以及不同牵伸工艺参数下,纱条变细曲线的模拟结果。给出在快速牵伸区和慢速牵伸区纤维比例的模拟曲线,给出了在已知长度分布下,牵伸纱条在前罗拉钳口下纱条截面纤维根数变异系数的模拟,此模拟结果与已有模拟结果相比具有良好的相关性,为实现牵伸后须条不匀的预测打下了基础。

Obtaining the dynamic behavior of fibers in the drafting zone through various simulation approaches is one of the important contents for the investigation of roll drafting.In consideration of fiber length distribution,the attenuation curve of the sliver in the drafting zone is given by using the method of parabolic density function for accelerated points proposed by previous researchers.Simulated results of the attenuation curves of the sliver are discussed under different parameters such as drafting ratio,and fiber length distribution.The simulated curves of fiber proportions in the fast drafting zone and the slow drafting zone are presented.For a given fiber length distribution,the number of fiber and the CV of these fibers at the front nip are simulated.The simulated results are in good agreement with previous simulated data.This research lays a foundation for the prediction of drafted unevenness of the output slivers.