基于Autodesk Maya的虚拟织物悬垂性影响因数分析

在Autodesk Maya环境下找出对虚拟织物悬垂性有显著影响的6个动力学参数,对不同参数设置的多组虚拟织物进行了悬垂性测试,并通过相关性和线性回归分析,求解出了虚拟织物悬垂性与动力学参数之间的回归方程,以及主要动力学参数对悬垂系数的影响。     

评估织物悬垂性的新方法

为了开发评估织物悬垂性的新方法,建立了描述悬垂织物的数学模型,用以描述织物的悬垂外观形态,并提出了评估织物悬垂性的新指标。选取6块平纹亚麻织物,在现有的织物悬垂性能测试仪器的基础上,引入3D扫描仪,获得了悬垂织物三维图像及数据,并对所获得数据进行统计处理得出评估结果。结果表明:新开发的数学模型可以精确地描述不同亚麻织物的悬垂外观形态,通过对不同平纹亚麻织物测试和数据分析,证实了新方法具有较高的准确性,相比于伞式法,该方法可以更为有效地评估织物的悬垂形态。     

织物结构参数对悬垂性的影响

悬垂性是影响织物视觉美感的一个重要因素。通过改变织物的组织结构、纱线线密度、经密与纤维原料,对不同结构参数的织物试样进行悬垂性测试。试验表明,相较于斜纹与平纹织物,缎纹织物的悬垂性最好;纱线线密度越小,织物的悬垂性越好;经密越大,织物的悬垂性越差;随着涤纶质量分数的增加,织物的悬垂性变差。     

基于仰视投影的织物悬垂性测试方法

提出一种基于仰视投影的织物悬垂性测量方法。采用CCD摄像头采集织物悬垂边缘的仰视投影图像,并对其进行图像处理和边缘检测,得到完整的织物悬垂边缘数据;对因投影关系而产生畸变的数据进行矫正;计算得到表征织物悬垂性的参数指标。采用传统的基于俯视投影的织物悬垂性测试方法对织物进行测试,得出实验数据。结果表明,基于仰视投影的新型织物悬垂性测试方法可以避免传统俯视投影测量方法在测量轻、薄、柔软织物时,因皱褶折到支撑盘的边缘内部而造成的不可避免的误差。     

涤纶织物性能指标与悬垂形态关系

为利用织物力学性能指标对织物悬垂性能进行预测,通过实验得到织物力学性能指标和基本结构参数,借助多元线性回归分析,得到悬垂性能的系列预测方程,并通过计算机模拟对结果进行验证.结果表明,织物悬垂形态与织物力学性能指标和结构参数密切相关,尤其是织物45.方向的剪切刚度、交织阻力、厚度、纬向密度等指标对织物悬垂形态的影响较大,...     

织物悬垂性影响因素分析

织物面料制成服装或窗帘等家居用品后，其力学性能构成悬垂性。文章利用实验测试的方法对织物的结构参数和机械性能进行研究，分析织物结构参数和机械性能与悬垂性之间的关系。结果表明，织物的断裂伸长、纬向弯曲刚度和活络率与悬垂性能之间存在密切的关系，而织物厚度和质量对悬垂性的影响不显著。     

结构参数及后整理方式对棉织物悬垂性的影响

探讨结构参数和后整理方式对棉织物悬垂性的影响。对8种不同结构参数的平纹棉织物分别进行柔软整理、免烫整理、液氨柔软整理、液氨免烫整理、液氨潮交联整理,然后利用PhabrOmeter织物风格仪测试各织物的悬垂系数,借助灰色关联分析和相关性分析,分析了不同后整理棉织物的结构参数与悬垂系数的关系。结果显示:对于此类棉织物,单位面积质量和厚度与悬垂系数的线性关系显著;相同结构参数下,液氨潮交联整理棉织物悬垂性较好。认为:结构参数及后整理方式对织物悬垂性有显著影响。     

基于3D扫描技术的织物悬垂性测试方法

文章提出基于3D扫描技术的织物悬垂性测试分析方法。利用3D扫描仪采集织物图像空间点数据,通过点云拼接、去噪、填充等平滑织物悬垂曲面得到扫描实体。沿着扫描实体的Z轴线方向等距离剖切得到多个XOY平面,并提取各个平面的悬垂波数、波峰半径等参数。实验结果表明,悬垂系数与传统方法测得的悬垂性指标相关性高,而织物各切面层波形个数、波形稳定高度、波峰半径与波谷半径变化趋势等参数直观地反映织物在三维空间中悬垂曲面形态变化,为评价织物悬垂性提供新的方法。     

基于MATLAB中csaps函数的织物静态悬垂波数求取

自行设计了一个织物静态悬垂波数求取的实验方案,通过MATLAB软件对悬垂数字图片进行处理和计算,以求取织物的悬垂波数。实验中重点要对悬垂轮廓进行光滑拟合,借助MATLAB＂拟合工具箱＂中的csaps函数（三次样条光滑拟合）,将离散的点拟合成连续光滑的曲线,得到较好的效果,使后面机器自动波数求取成为可能。本方案对开发数字图像法织物悬垂性测试仪器也有一定的参考意义。     

影响真丝织物悬垂性及耐磨性因素的分析

通过对6种真丝织物的基本结构参数及悬垂系数和磨损量的测试,应用灰色关联分析方法对织物基本结构参数与悬垂性、耐磨性能之间的关系进行定性和定量的分析.实验结果表明:真丝织物的平方米重、纬密、经纱纤度、厚度、纬纱纤度、经密对悬垂性能的影响依次减小,而对耐磨性能的影响大小依次是纬密、纬纱纤度、经纱纤度、平方米重、经密、厚度.     

ZYF-3型织物悬垂三维测试仪的研制

介绍ZYF-3型织物悬垂三维测试仪测试原理及其结构设计,仪器为光机电一体化结构,采用环形结构光法测量原理,由抛物镜面和光栅生成环形结构光,CCD摄像头获取织物表面形成的明暗相间等高线条纹,测试软件实现等高条纹及织物边缘的识别并完成数据处理,不仅可得到表征织物悬垂性能的各项评价指标,且可实现织物悬垂三维形态的仿真重建,为织物悬垂性能的测试评定及深入研究提供了一种新方法。     

The Characterisation of the Static and Dynamic Drape of Fabrics

This paper discusses and establishes the static and dynamic drape of fabrics as an aesthetic property. A new algorithm is introduced, which defines more precisely the drapability of a given fabric. Experimental results show that it is more accurate to describe the different types of fabric-drape performance by using a feature vector, and this is found to be in good agreement with subjective assessment. A computer-based vision system, the Static- and Dynamic-drape-measurement System (M³), was developed and made possible the application of the new algorithm to actual fabric measurement. The results show agreement between aesthetic judgement and subjective assessment, and consequently fabric drape is standardised into four drape grades, ranging from high to low. The M³ is able to relate fabric drape with mechanical properties, simulating intelligence or expert knowledge when property change is needed for achieving a required drape performance.     

Fabric objective measurement and drape

This issue of Textile Progress reviews the origins of fabric objective measurement through its research and development phases to its current use in research and industry. It then examines, in greater detail, the use of fabric objective measurement (FOM) methods for the measurement and prediction of fabric drape. Such prediction has become increasingly important in recent times, due to the push from the fashion industry for accurate three-dimensional (3-D) simulation and animation of apparel in its various forms, to allow fashion designers to visually prototype their garment creations without the need for the tedious and time-consuming steps involved in real-garment prototyping. The demand for accurate 3-D simulation and animation is occurring in the face of an ever-increasing variety of fabric types, which means that drape measurement methods must become more sensitive and more widely applicable than has been the case to date. The authors, in the light of this review and their own research experiences with fabric drape, offer the view that the measurements taken by existing methods of FOM and drape are unlikely to provide the accuracy and wide applicability required for realistic on-screen evaluation of apparel, not least because in a garment, fabric is neither draped nor supported horizontally in the way that the fabric is configured in the test methods.     

Enhancing accuracy of drape simulation. Part I: Investigation of drape variability via 3D scanning

The objective of this two part paper is to present a method of enhancing accuracy of fabric drape simulation using commercially available software. In Part I, we report results of an investigation of drape variability for a set of fabrics having varied mechanical properties, an essential step in defining accuracy for drape simulation. Results illustrate that fabric drape behaviour is highly variable and thus provide no single drape configuration to target with simulation. Development of a revolutionary method for capturing drape of actual fabrics and measuring that drape in a virtual three-dimensional (3D) environment is also presented. The method allows identical drape measurement processes to be implemented for actual and simulated fabrics and provides opportunity for use of additional measures to assess fabric drape in three dimensions. The accomplishments presented in this paper are utilized to demonstrate, in Part II, development of a relationship that enhances realism of particle model simulations generated using the commercial drape simulation software.     

织物静态悬垂系数试验时间的确定

为了科学地确定织物静态悬垂系数的试验时间,选用自行设计的利用图像技术测试悬垂性能指标的XDP-1型织物悬垂仪,其试样放置方法为试样托盘平稳上升,织物试样自重下垂,能有效地测试1块处于静止状态的织物试样在1个时间序列下的多个静态悬垂系数值。通过对织物静态悬垂系数随测试时间变化曲线的分析,认为试验时间设定为固定时间的规定是不合理的,并提出采用最小试验时间来测量织物静态悬垂系数,这样可提高测量结果的合理性与重现性。     

21—THE MEASUREMENT OF FABRIC DRAPE

It is shown how the method of measuring fabric drape by supporting a circular specimen of fabric between smaller horizontal circular plates has been modified to allow a more sensitive test to be made on very stiff and very limp fabrics. The use of diverging light instead of parallel light is described, and the correction of the results for this change is calculated. A method of determining the drape coefficient by a paper-weighing method is also described.     

基于三维人体形态的织物立体悬垂测试方法与表征

针对传统织物悬垂性能测试法的固有缺陷,以人体三维形态为基准,提出了一种测试自然悬垂状态下织物立体悬垂性能的新方法,研制了织物三维立体悬垂仪,并依此原理设计和制作了简易模型测量装置。提取织物的波纹数、悬垂系数、平均弯曲指数、弯曲变异指数等指标,对织物立体投影曲线进行CAD模拟分析研究结果发现：与传统伞式悬垂测试法相比,新方法所得悬垂系数与织物的悬垂性能成正相关,2种方法所测波纹数接近,相关性高达0.9,表明三维立体悬垂性能测试方法可更逼真地反映织物的真实悬垂性能与形态。由此建立的织物悬垂性能指标体系可更好地反映织物的造型能力。     

生物基锦纶的性能及其在针织面料中的应用

研究了生物基锦纶的性能,试制了生物基锦纶针织面料并对其性能进行详细测试和分析,探讨了这类新型生物纤维在针织面料开发中的应用前景。首先采用红外分析方法确定了生物基锦纶的结构,从分子结构层面探讨其性能;通过将生物基锦纶针织面料与锦纶6、涤纶面料的性能进行对比,得出生物基锦纶具有较好的耐磨、悬垂、吸水等性能;采用多指标综合评价方法,显示生物基锦纶在服用方面综合指标最高,从而证实其能够在内衣和外衣面料上得到较好的应用。     

Introducing and optimizing a novel mesh for simulating knitted fabric

In this paper, a mass spring system is developed to simulate the draping behavior of knitted fabric. A new type of mesh based on loop structure, which is called Loop mesh, is introduced. The effective properties on fabric drape are measured using the Fast system, and the experimental data are incorporated into the mass spring model to simulate the draping behavior of knitted fabrics. 3D shape of real drape behavior of fabric samples is achieved using depth camera. Then in order to reduce error value between simulated and real results, distances between mass points in the Loop mesh are optimized using the Imperialistic Competitive Algorithm (ICA). In order to investigate validity and accuracy of the Loop mesh, drape behavior of knitted fabrics falling over a square table are also simulated using common meshes. It can be found that the Loop mesh produced a closest drape shape to the real fabric drape than other mesh models. Finally, fabrics drape is simulated in other situations and compared with its real result to validate the proposed model. Results show that the optimized model is able to simulate the drape behavior of knitted fabric with error value of 4.29 percent.     

图像法测试织物悬垂性能的各向差异

为研究织物沿经纬向悬垂性能的不同,自制了基于图像法测试织物不同方向悬垂性能的装置。将织物放置在载布台上,利用数码相机摄取织物自然悬垂状态的正面及经纬侧面悬垂图像,通过AutoCAD软件对图像进行处理和数据分析,获得悬垂系数、织物经纬向悬垂状态最大长度比及经纬向面积比3个指标评价织物悬垂性能。测试30块试样,提出一种不同方向织物悬垂性能综合评价的新方法。并在相同条件下,利用YG811织物悬垂性测定仪对相同面料进行测试。对比分析结果表明,其中24块织物测试结果误差不大于5%,说明用新方法和评价指标测试的结果是可信的。