纬平针织物自然状态线圈单元卷曲模型

针对自然状态下针织物易产生卷边的问题,以纯棉纬平针织物为研究对象,建立纬平针织物线圈空间几何模型,分析针织物卷边产生机理,利用卡式定理建立自然状态下织物边部线圈卷曲高度以及卷曲角度的计算公式,分析圈距和圈高变化对线圈单元卷曲行为的影响。结果表明,线圈的圈距和圈高越小,线圈单元卷曲角度越大,纬平针织物越容易卷边。     

基于几何模型的纬编提花织物结构计算机辅助设计

通过对构成纬编提花针织物的基本线圈单元进行几何结构分析,建立几何模型,开发了一套纬编提花针织物计算机辅助设计系统。利用该系统,通过输入花型信息及圈高、圈宽、纱线直径等参数,不仅能以图形方式直观地显示针织物的线圈结构形态,还能计算线圈长度等织物结构参数。     

纬编针织物在计算机中的三维仿真

为真实模拟纬编针织物的结构,通过分析纬编针织物的物理模型,在三维Pierce线圈模型基础上,引入B样条及椭圆描述线圈,从而建立三维几何线圈模型.根据纱线线圈的中心线走向,将线圈分为两个部分:弧段和圈柱,弧段(如针编弧、沉降弧)用椭圆描述,圈柱用三次B样条曲线模拟.最后利用OpenGL结合VC++模拟针织物的结构,并实现光照效果.试验结果表明:采用该模型及实现方法,模拟效果比单独采用三维Pierce模型、B样条模型更加逼真.     

纬编针织物几何建模研究的进展

就纬编针织物线圈几何模型的国内外研究现状及发展趋势进行综述,并分析了该研究中的特点、关键技术等问题,为今后进一步建立更加复杂的线圈模型及针织CAD系统开发打下基础.     

基于改进Peirce线圈模型的色纺段彩纱纬平针织物仿真

为解决色纺段彩纱针织物颜色复杂多变和模拟难度大的问题,提出一种基于改进Peirce线圈结构模型的色纺段彩纱纬平针织物仿真方法。通过采集并处理纱线图像,提取纱线条干部分的图像信息,对纱线图像进行拼接。根据实际线圈结构图像,对Peirce线圈模型进行改进,确立模型中心线和各参数之间的关系。将纱线图像映射到线圈模型上,调整线圈之间的覆盖关系,实现织物的模拟。结果表明,该改进的线圈结构模型与实际纬平针织物的线圈结构一致,模拟算法可以准确地实现对色纺段彩纱纬平针织物的模拟,并且可以适用于不同织物密度和段彩颜色纬平针织物的模拟。     

针织基本组织的动态模拟

主要以Pierce线圈模型为基础，探讨了用线圈结构图动态模拟纱线形成基本针织物的原理和方法。     

纬编提花导电针织物的电热性能

基于纬编针织物线圈的几何形态,构建一种提花导电针织物的电阻模型,并推导织物面电阻的理论计算式,同时开发不同导电纱成圈数占比的纬编提花导电针织物,通过试验对所建立电阻模型进行验证。结果表明,建立的电阻模型的电阻值与试验电阻值的最大绝对误差为0.104Ω,最大相对误差为6.42%,两者吻合程度较高,可以用该电阻模型预测纬编提花结构设计对导电针织物电学性能的影响。对纬编提花导电针织物进行热性能测试,织物平衡温度可达48.8～62.9℃,且热稳定性好,满足电加热服电热元件的要求。     

添纱衬垫针织物的线圈几何结构性能

本文提出了舌针添纱衬垫针织物的线圈几何模型假设,并通过实验确定了在松弛状态下,全棉舌针添纱衬垫针织物的纵横向密度与面纱线圈长度和地纱线圈长度之间的两元线性回归方程。文中还对地面纱线圈长度、线圈长度比和纱线号数的影响分别进行了讨论。所得结果可用来预测和控制该类织物的潜在缩水率。     

接触电阻对导电纬平针织物柔性传感器的电-力学性能影响

采用Popper和Kawabata的针织物力学模型计算纬平针织物线圈中交叠纱线间的接触力,为了简化计算过程,采用两个弯曲的纱线相互钩套来模拟导电纬平针织物线圈中相互交叠的纱线,导电纱线间接触电阻和接触力的关系可用经验幂函数求得.由理论分析和试验研究可得:导电纬平针织物线圈中交叠纱线之间的接触电阻随接触力的增加呈幂函数减小;由接触电阻引起的电阻变化是影响导电纬平针织柔性传感器灵敏度的关键因素;导电纬平针织物电阻随应变的增加而线性减小.     

一种增强模拟纬编针织物外观真实感的方法

为增强模拟纬编针织物外观的真实感,在已有三维线圈模型的基础上,通过引入球的极坐标方程和基于类正态分布函数的随机方法计算毛羽模型控制点,构造曲线模拟毛羽走向,控制构建股线的单纱根数和弯曲度,从微观结构上使线圈模拟更为逼真.最后对已生成的线圈图像进行特征像素提取,计算最小重复周期,使其满足四方连通性,形成纬编针织物外观纹理.     

Three-Dimension Parametric Simulation of Knitted Fabric Based on the Twisted Loop Model

To enhance the realistic simulation effect of knitted fabric, a new three-dimension （3D） twisted loop model was proposed. This model was constructed by using Non-uniform Rational B-Spline （NURBS） surface. The control points of this surface were generated through rotating the cross-section along the center path of yarn. The cross-section of yarn was generated based on the two-level hexagonal ~lose packing model. Both of the center path and the cross-section were fitted by NURBS. With this twisted loop model, 3D parametric simulation of knitted fabric was realized in 3DS MAX by utilizing MAXScript and analyzing the relationships between structure parameters （including the wale-spacing, the course-spacing, the yarn diameter, .and the fabric thickness） and geometric model. The simulation of knitted fabric has 3D realistic twist effect dearly. Furthermore, the structure parameters and the twist parameters of fabric can be modified interactively.     

STUDY ON THE METHOD FOR EFFECTIVELY QUICK DETECTING THE EVENNESS OF A KNITTED FABRIC

In this paper,the relations between the parameters of stitch structure and the needle penetra-tion force,and the method by using the needle penetration force detected to evaluate the looplength and evenness of knitted fabric indirectly are analysed and discussed.A microcomputer system with a needle sensor and author's program are used as a pick up setcombined with a data analysis system,for sampling and analysing the needle penetration forcedata.A lot of experimental research work has been done for knitted fabric of some kinds of knittedstitch and loop length.As a summary of this study,some conclusions can be drawn from the linearregression between the needle penetration force and the loop length.Then,the size and evenness ofthe loop length of knitted fabric can be indicated indirectly by detecting the value and variance ofneedle penetration force.It offers an effective method to detect and evaluate the evenness of knit-ted fabric with an efficiently high speed.     

Web-Based Interactive Simulation of Weft Knitted Fabric

In order to realize parametric simulation of three- dimensional (3D) fabric structure based on web,a 3D model describing a plain knitted fabric,in which the cross- section of the yarn is circular shape and the path of the yarn is cubic B-spline curve,is proposed in this paper. With this model,the 3D simulation of the loop and of the basic structures of the knitted fabrc is realized by using Virtual Reality Modeling Language (VRML). The virtual simulation scene is suitable for network transmission with freely available VRML browsers and can be translated,scaled and rotated quite arbitrarily. By using Java and External Authoring Interface (EAI) technology,the web- based interactive simulation platform of weft knitted fabric is established. The user can input type of structures,basic fabric parameters,and yarn colors interactively to obtain a more realistic simulation result in real-time. A new approach is provided to imitate the knitted fabric 3D appearance on network.     

Investigation on the Dimensional Properties of Relaxed Plain Knitted Fabrics

A geometric model of relaxed plain-nitted fabric isproposed.A method based on the model for predictingthe loop length from the course spacing,wale spacing offabric and the diameter of yarn is deduced,as well as a computer program is developed to graphically represent the structures of plain knitted fabric with various struc-tural parameters.     

小口径圆筒形纬平针织物线圈形态的几何分析

小口径圆筒形纬平针织物作为人工气管、血管外支架等医用支架在医疗领域得到了应用,而支架的表面几何形态及其孔隙率是临床使用中考虑的一个重要因素.将小口径圆筒形纬平针织物的一个线圈分为8个部分,对其线圈形态进行分析,给出了线圈横向和纵向变形达到极限时的几何特征,推导了表面孔隙率的计算公式.并针对一个给定的小口径圆筒形纬平针织物进行了计算,得出了各几何参数之间的关系.     

APPLICATION OF COMPOSITE FIBRE TO HIGH ELASTIC KNITTED FABRIC

The knitting condition and technology for PBT/PET composite fibre on loop wheel machine as well as the effect of knitted fabric structure and stitch parameter are discussed in this paper. The properties of high elastic plain knitted fabrics are also discussed.     

热环境中针织面料穿着舒适性影响因素的研究

从人体穿着舒适的要求出发,对热环境中针织面料的穿着舒适性进行了研究,找出影响针织面料舒适性的某些织物结构参数,为功能性织物设计、生产及服装选料提供一定的参考.     

Research on the Loop Deformation of Flat Silk Knitted Fabric Made from Parallel Spun Silk/ramie Core Yarn

This paper analyzes the causes of loop deformation of flat silk knitted fabric made from parallel spun silk/ramie core yarn. Through the measurement and analysis on the loop deformation of various samples, it is concluded that the problem herein mentioned would be improved to a certain extent by changing the fabric density or mixknitting from yarn with different direction of twist.     

单针床氨纶弹力经编毛圈织物的探讨

单针床氨纶弹力经编毛圈织物的编织，至少要使用三把梳栉。机后两把流栉为地梳栉，机前一把梳栉为毛圈梳栉，并且氨纶弹性纱线应穿在后梳栉上。地组织必须采用针后移针与毛圈沉降片横移同向的经平组织，毛圈组织应采用编链组织。