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本文对３Ｄ—ｍｅｓｈ实体所描述的三维自由曲面一侧的梁件计算机辅助设计方法进行了研究，提出并采用了截交线算法和任意点算法，并根据力学及工艺条件提出了主棱边空间位置优化的概念及算法，可使三维扭曲梁的力学性能和工艺性能同时达到最佳状态，此方法已成功地用于流线型高速机车三维扭曲梁的设计．
In this paper, the computer-aided design method of beam on the side of 3D free-form surface described by 3D-mesh entity is studied. The algorithm of cut line and arbitrary point are proposed and adopted. According to the mechanical and technological conditions, the main edge space The concept and algorithm of location optimization can simultaneously achieve the best mechanical and technological performance of three-dimensional torsional beam. This method has been successfully applied to the design of three-dimensional curved beams for streamlined high-speed locomotives.