大小头筒状纬编针织物建模及其线圈长度逆向设计

为解决针织物成形存在工艺设计目标与成形织物差异大的问题,提出一种从目标织物出发的织物线圈长度设计方法。根据圆形纬编针织机和纬编针织物的特性,将织物在周向和轴向划分为单元,提出基于Pierce模型改进的梯形线圈模型,并对大小头筒状纬编针织物建模。在此基础上得到各线圈长度与目标织物参数间关系,实现从目标织物出发的织物线圈长度计算,根据此控制线圈长度实现大小头筒状织物的设计。实验结果表明,大小头筒状纬编针织物中线圈长度的变化,理论与实际结果基本一致。根据提出的基于梯形线圈模型的建模方法,可依据大小头筒状纬编针织物参数得到任意线圈长度,实现线圈长度逆向设计。

Modeling and loop length reverse design for reducing diameter tubular weft knitted fabrics

In order to address the big difference between the process design goal and the formed fabric,a design method of loop length based on the target fabric was proposed.According to the characteristics of circular weft knitting machine and weft knitted fabrics,the fabrics were divided into units in the circumferential and axial directions,an improved trapezoidal loop model based on Peirce model was proposed,and the diameter reducing tubular weft knitted fabrics were modelled.On this basis,the relationship between the length of each loop and the parameters of the target fabric was studied,and the design of the fabric loop length carried out based on the target fabric.The experimental results show that the theoretical and actual results are basically the same for the change of loop length in the reducing diameter tubular weft knitted fabrics.According to the proposed modeling method based on trapezoidal loop model,it is possible to get loop length from parameters of reducing diameter tubular weft knitted fabrics,and this research exercise demonstrated loop length reverse design process.