Generating realistic three-dimensional (3D) yarn-level models for fabrics has become a significant research topic due to the complexity of fabric structures and the requirement for high-quality models with no interpenetration between yarns. The generation process of idealized geometric models leads to inaccurate descriptions of yarn contact, specifically the interpenetrations and spurious voids between yarns. A geometric optimization procedure was developed to address the defects in the idealized models, involving a series of geometry-driven operations, such as the shrinking and expansion of yarn volume and the straightening of the yarn centerline, to obtain accurate and consistent fabric models for Finite Element Analysis. During the geometric optimization, a method for yarn deformation based on position-based dynamics (PBD) was applied to simulate the real deformation during yarn interweaving, ensuring no interpenetrations between yarns while preserving yarn volume. The accuracy of the model is validated by comparison with the real fabric images. Although the methods involved in the procedure are all geometric, their deformation results have realistic physical effects. In addition, the procedure can be applied to various woven fabric structures.

中文翻译：

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使用基于位置的动力学来优化机织织物几何模型的变形程序


由于织物结构的复杂性以及对纱线之间没有互穿的高质量模型的要求，为织物生成逼真的三维 （3D） 纱线级模型已成为一个重要的研究课题。理想化几何模型的生成过程导致纱线接触的描述不准确，特别是纱线之间的相互渗透和伪空隙。开发了一种几何优化程序来解决理想化模型中的缺陷，涉及一系列几何驱动的操作，例如纱线体积的收缩和膨胀以及纱线中心线的拉直，以获得准确一致的织物模型用于有限元分析。在几何优化过程中，应用了一种基于位置动力学 （PBD） 的纱线变形方法，模拟了纱线交织过程中的真实变形，在保持纱线体积的同时，确保纱线之间没有互穿。通过与真实织物图像的比较来验证模型的准确性。尽管该过程涉及的方法都是几何的，但它们的变形结果具有逼真的物理效果。此外，该程序可应用于各种机织织物结构。