应用图像法的织物弯曲刚度计算

Calculation on bending stiffness of woven fabrics by image processing method

为评估虚拟服装所采用织物模型的准确性,有必要全面对比虚拟织物和真实织物的弯曲性能,因此提出采用图像法来计算织物的弯曲刚度。为采集织物在悬臂梁上弯曲形态的图像,设计了织物弯曲仪。真实织物在自重弯曲状态边缘存在翘曲现象,必须从翘曲织物的侧面形态中确定一条可以代表其弯曲性能的曲线。分别计算了翘曲织物上、下边缘曲线的弯曲刚度,提出采用中值曲线表示织物弯曲性能的方法。实验结果表明,通过中值曲线得到的弯曲刚度和KES法得到的弯曲刚度存在很好的线性相关度,且在45°和41.5°斜面上的测试结果具有很好的一致性。

To evaluate the accuracy of the fabric model used in virtual cloth,it is necessary to compare the bending properties between the virtual fabric and real fabric. A new method is proposed to test the bending property of woven based on image processing. An instrument has been made to collect the bending shape of woven fabrics under the cantilever beam tests. The real fabric bending under its own weight comprises warps which is inevitable in most cases. Therefore,certain curve selected from the side shape of curve fabric has to be proved suitable for representing the bending shape of the fabric. An approach of the mid-line representing the fabric＇s bending properties has been developed after calculating the bending stiffness of fabric＇s five different curve. This calculation and test method have been validated by experimental observations and correlation with KES test method. The results of tests on 45° and 41. 5°inclined plane also reached a good consistency.