基于二维傅立叶变换轮廓法的织物表面形态测量研究

提出一种基于交叉光轴投影光栅系统和非移频的二维傅立叶变换轮廓测量方法,结合数字加权滤波和可靠度排序的解调技术,获取织物表面变形后的三维轮廓数据,并给出了几种织物面形测量的实例。     

应用图像分析技术评估织物起球等级

探讨了应用图像分析技术对织物起球进行客观的等级评估.首先介绍了应用Wold分解纹理模型从织物图像中分离出毛球信息,然后对提取的毛球信息进行阈值化处理,再以毛球的面积百分比、总数和分布等三个特征指标对起球等级进行客观评估.运用上述技术途径对素色、印花及色织的简单与复杂组织等7种织物样品进行起球等级的客观评估,结果与专家的人工主观评定极为吻合.     

织物手感的认知原理及其研究

织物手感是纺织品十分重要的性能之一．经过近一个世纪的研究，随着科学技术的发展，对织物手感的表征和评价取得了不少成果．但由于人们对大脑认知行为的认识尚不成熟，对织物手感的神经认知原理还处于探索阶段，导致对织物手感形成机制的理解不深入，从而限制了该方面研究的进展．通过分析织物手感形成的生理基础，归纳了探索织物手感方面的研究工作，试图从认知心理学角度澄清以往在该领域研究工作的模糊认识，分析传统上从认知心理学角度研究织物手感认知属性空间的不足．同时，结合认知神经科学最新的研究结果，寻求织物手感定量表征的发展方向．     

Combined Cellulase and Wrinkle-free Treatment on Cotton Fabric

1,2,3,4 - butanetetracarboxylic acid (BTCA) offers an alternative to the conventional N-methlol compounds as a crosslinking agent for cellulose textiles. Cellulase treatment is an effective method to improve the handle of the cotton fabric. Thus it is of particular interest to treat cotton fabric using cellulose and BTCA simultaneously. In this study, BTCA was applied to the cellulase pre-treated cotton fabric, and softener was also used. The results show that the treated fabric does not only have good wrinkle-free property but also good handle.     

提花羽绒布生产工艺的研讨

通过对提花羽绒布织物的极限密度、组织系数及不同上机工艺参数的理论分析，阐明了在GA731剑杆织机上生产提花羽绒布的可能性及有关的工艺参数，为提高产品的实物质量和生产效率提供科学的依据。     

精梳毛纱加捻颜色分析与补偿系统的开发

捻系数不仅是影响纱线结构的最重要的结构因素,而且也影响着织物的视觉颜色.采用SPSS统计分析软件对精梳毛纱的捻系数及颜色亮度值进行分析,建立二者之间的非线性关系;同时利用位图的Alpha混合技术,对某特定捻系数下的纱线视觉颜色加以补偿,获得用户期望的纱线/织物的视觉颜色.     

分形理论在织物折皱评定中的应用

利用计算机图像处理评定织物折皱.在全面分析了织物折皱图像的分形特征基础上,提出利用格栅法计算析皱图像灰度曲面的分维数,以此评定织物的折皱起伏情况.探讨了利用相似维数分析评价折皱图像的折皱纹理的形态复杂度.实验表明利用分形理论可以描述织物折皱特征,并对折皱性能进行评价.     

异收缩长丝仿毛原料及其织物风格研究

以高收缩丝、微细旦POY丝、低弹丝(DTY)等差别化长丝为原料,加工成异收缩复合空变纱,对其纱线及仿毛织物进行了基本力学性能研究,对比纯毛织物得出:高收缩涤纶丝(单丝纤度为0.3tex左右)与POY皮芯复合空变加工成异收缩变形纱,其织物仿毛效果好;涤纶混色空变纱织物或与网络弹力丝进行交织的织物仿毛效果也较好。     

The Fractal Characterization of Fabric Wrinkle Image

In this paper, fractal theory is introduced to assess the fabric wrinkle. The fractal features of fabric wrinkle are analyzed by image processing technique. The fractal dimensious of gray level surface are calculated by the retieular cell counting method. The results indicate that it can be used to character the fluctuation of gray level surface in fabric wrinkle image. The fractal dimensions of wrinkle blocks are achieved by the blocks areas analysis. It is testified that this dimension can describe the features of wrinkle blocks area distribution. The two kinds of fractal dimension can both objectively rank the fabric wrinkling.     

FINITE ELEMENT SIMULATION OF FABRIC CANTILEVER TEST

The present paper describes the application of the finite element technique to simulate large fabric deformations in the case of a rectangular cantilever. The fabric is simulated using a degenerated isoparametric curved shell element with 8 nodes. The cantilever is considered as a special case of a three dimensional shell structure. The finite element formulation takes into account nonlinear material properties of fabrics. Simulation of woven fabric cantilevers is made and the results are compared with the test results to examine the effectiveness of the finite element approach.     

Investigation on Bending and Creasing of Woven Fabrics under Low Curvature

Under the assumption of semi - circular form for a fabric bend, creasing of fabric strips and compression of fabric loops are analyzed by neglecting the structural complexity of the fabric. The relationship between the creasing force and deformation are deduced using an energy method and solutions are given for a linearly elastic material with constant internal frictional constraint. The agreements between the theoretical predictions and experimental results are very satisfactory.     

Analysis of the Thermohydro - comfort Durability for Microfil - polypropylene Knitted Fabric under Grey System

Thin microfll - polypropylene knitted fabric that is knitted to use new single plated theory on large diameter circular weft knitting machine is a new functional fabric. After military use, the reflective opinions are that it is light, thin, soft, smooth - touch, and it has excellent elasticity, good air perviousness, large water vapor permeability . In this paper, an analysis is held to use grey system theory, and the thermohydro - comfort durability of this microfil - polypropylene knitted fabric is compared with that of common knitted fabrics. The analytical result proves the microfil - polypropylene knitted fabric is satisfactory under the climatic conditions that human body needs to eliminate or retain the quantity of heat. It can be use to seam up not only physical ability training uniform of serviceman but also civil sporty and sportswear et cetera.     

基于傅里叶变换移相测量的相位测量轮廓术

移相误差是移相法相位测量轮廓术的主要误差来源,提出一种对实际步进移相值进行测量,消除移相误差对相位测量影响的算法,该算法将傅里叶变换相位测量和移相法相位测量相结合,利用傅里叶变换相位原理测量每次移相的实际相移量,然后根据相移实测值计算相位分布,进而获得物体表面蝗三维数据。该算法能够准确测量每步移相的实际相移量,不要求移相的均匀性和重复性,只需３帧图像就可解调出相位分布,不受移相误差的影响。仿真结果证实了该算法的有效性,实际图像数据处理结果表明,该算法可以基本消除由移相引起的误差。     

基于三角形光强分布光栅投影的三维测量方法

针对相位测量轮廓术中正弦光栅制作工艺复杂的问题,提出一种基于三角形光强分布光栅投影测量物体三维形貌的方法.测量时,将三角形光强分布光栅投影到被测物体表面,摄像机获取变形条纹图,通过系统参数和条纹图携带的相位信息求解出物体的三维面形.推导出通过三角形光强分布光栅求解相位的公式.实验结果表明,提出的方法具有较高的精度和可行性.     

Assessing Fabrics Wrinkling by Image Analysis

In this paper, the features of fabric wrinkle structure are analyzed, by image processing technique. The wrinkle images are processed and character parameters are extracted. The wrinkle side surface area ratio of image gray level intensity, the standard deviation of total pixels' gray level intensity and the standard deviation of wrinkle block area are adopted to evaluate fabric wrinkling. The results show that these three character parameters can be served for ranking the wrinkling. It provides a feasible objective method for fabrics wrinkling degree assessing.     

六角形三维编织物结构的Matlab仿真及优化

基于六角形三维编织工艺,通过分析编织过程中携纱器的运动规律,利用Matlab编写算法将其所读取的电机控制矩阵转化为编织纱线的空间轨迹点坐标,利用B-spline曲线对纱线运动轨迹进行拟合,再对纱线截面和花节长度进行优化,得到一种能够很好地反映真实编织样本的结构纱线模型。仿真结果显示,纱线模型中的纱线形态与真实织物中的纱线相似,纱线编织角规律符合实际织物。研究结果为六角形三维编织物的纱线空间结构可视化和单胞体划分提供了理论和技术基础。     

基于小波变换和图像分割的织物等级自动评定

在运用小波变换进行疵点检测的基础上,运用图像处理技术对检测出的疵点进行分割表征,根据人工验布的评分标准结合小波疵点检测和图像分割疵点的特点制定的自动评分准则,并对表征的疵点进行评分,从而实现对织物等级的自动评定.     

应用图像分析技术自动识别织物的组织结构

通过对机织物图像的表面形态分析,建立3种基本组织(平纹、斜纹和缎纹)的表面纹理模型,运用傅里叶变换技术得到3种基本组织的频谱模型,并建立表面纹理模型和频谱图模型之间的对应关系,从而为运用图像分析和人工智能技术自动测量织物的结构参数、识别机织物类型奠定理论基础.实验结果证明,这种方法是准确可靠的.     

应用微机图像处理技术测试织物悬垂性研究——织物悬垂图像测试方法

探索用图像处理技术测试织物的悬垂性能.这部分重点介绍采用伪中值滤波去除原始图像的噪声,选用流动阈值法作目标与背景分离,通过特征参数提取获得现有织物悬垂仪所能得到的各项悬垂性指标,并给出目标图像的某些悬垂形态与三维信息,为进一步建立用主客观相结合的评价织物悬垂性方法提供现代技术手段.     

Magnetic fabrics in fault-related fold and its relation with finite strain: an example from Mingjiang thrust structures in Western Sichuan

The anisotropy of magnetic susceptibility (AMS) is a quick, effective and sensitive technique used to measure the weakly deformed sedimentary rocks, and also a reliable method to reveal the deforming mechanisms of fault-related folds. In Longmenshan front belt, a typical cross-section of fault-related folds is chosen to study the AMS. A total of 224 oriented specimens have been drilled at 23 different sampling sites which were distributed at the key structural positions of this structural section developed in the Xujiahe formation of the upper Triassic. Six elementary types of magnetic fabrics are recognized and established through this AMS study: 1) a sedimentary fabric; 2) an initial deformation fabric; 3) a pencil structure fabric; 4) a weak cleavage fabric; 5) a strong cleavage fabric; 6) a stretching lineation fabric. It has been found that most of magnetic fabrics are characterized by fabrics of weak deformation which belong to the pure-shear results of a pre-folding layer parallel shortening (LPS). In the fault-bend fold, almost all magnetic fabrics are the initial deformation fabrics of weak deformation, and denote that the deformation in the forelimb is stronger than that in the backlimb and no finite strain is shown in the footwall. While in the fault-propagation fold， finite strains are concentrated in the trishear zone where magnetic fabric results are approximately consistent with the estimated consequences of the kinematic model. The tectonic stress field indicated by the magnetic fabrics is basically the same along the whole structural section and shows a NW to SE compression and shortening which is accordant with the regional compressive stress field of the Longmenshan fold-thrust belt.