The irregular cross section annular axis braided preform is modeled by using finite element simulation instead of geometric modeling. The braiding process is simulated by using a finite element software to obtain the yarn path. And the braided preform is modeled by using nine virtual fibers to form irregular cross section shape of yarn. Meanwhile, a modified vertical braiding machine is used to braid the actual preform, to compare with results from the simulation model. The results show that the simulation model is consistent with the actual braided preform, braiding angle is about 36°, and yarn spacing is about 6 mm. The finite element method can predict the yarn path more accurately without the need of complex analysis and derivation, especially when the irregular mandrel is used for braiding. In addition, the cross-section shape of yarn composed of virtual fibers can be used to achieve a more realistic simulation result. FEM is an efficient simulation method, and can also provide an effective basis in studies of the actual cross-sectional shape of yarn and the properties of its composite reinforcements.

不规则截面环形轴编织预制件采用有限元模拟代替几何建模。通过使用有限元软件模拟编织过程，获得纱线路径。并通过使用九根虚拟纤维形成不规则横截面形状的纱线来模拟编织预制件。同时，使用改进的垂直编织机编织实际瓶坯，与仿真模型的结果进行比较。结果表明，仿真模型与实际编织预制件一致，编织角度约为36°，纱线间距约为6 mm。有限元法可以更准确地预测纱线路径，无需复杂的分析和推导，特别是在使用不规则芯轴进行编织时。此外，可以使用由虚拟纤维组成的纱线横截面形状来实现更逼真的模拟结果。有限元法是一种有效的模拟方法，也可以为研究纱线的实际横截面形状及其复合增强材料的性能提供有效的依据。