Geometric Model for Multi-axial Warp-knitted Fabric Based on NURBS
Geometric Model for Multi-axial Warp-knitted Fabric Based on NURBS
复制标题
DOI：
--
复制
发表时间：
2014
影响因子：
0.9
通讯作者：
G. Jiang;Luying Gu;Honglian Cong;X. Miao;Aijun Zhang;Zhe Gao
中科院分区：
文献类型：
--
作者：
G. Jiang;Luying Gu;Honglian Cong;X. Miao;Aijun Zhang;Zhe Gao
在研究多轴经编结构中纱线系统组成及相关纱线几何形态的基础上，利用NURBS曲线和曲面原理，建立了现代多轴经编织物中绕线、插入纱和短切股毡的三维实体模型，以反映三者的几何结构。并利用OpenGL在vc++环境下开发相应的三维计算机仿真系统。NET，可以模拟多轴经编织物的几何模型。同时，通过对织物单元格的选择，建立了现代多轴短切绒经编织物的单元格模型，推导了几何参数与工艺变量之间的关系。得到了现代多轴短切绒经编织物纤维体积分数的理论公式。并以不同规格的织物为样品，比较了纤维体积分数的理论值和实验值。结果表明，理论值与实验值吻合较好，证明了该模型的科学性和实用性。
Based on studying the constitution of yarn system and the geometric modality of relevant yarns in the multi-axial warp-knitted structure, 3D solid models of the loop yarns, insertion yarns and chopped strand mat in modern multi-axial warp-knitted fabrics were built to reflect the geometric structures of the three items by using NURBS curves and the prin ciple of curved surfaces. Besides, OpenGL was employed to explore the corresponding 3D computer simulation system under the condition of VC++.NET, which could simulate the geometric model of multi-axial warp-knitted fabric. Meanwhile, through the selection of the unit cell of the fabric, the unit cell model of modern multi-axial warp-knitted fabric with chopped strand mat was developed and the relation between geometric parameters and process variables was deduced. The theoretical fibre volume fraction formula of modern multi-axial warp-knitted fabric with chopped strand mat was obtained as well. Furthermore, by using different specifications of fabric as samples, theoretical and experimental values of the fibre volume fraction were compared. The results revealed that there was good agreement between the theoretical and experimental values, which proved that the model was scientific and practical.