高速列车车头纵剖面最大轮廓线辅助快速设计

Aided Rapid Design of Maximum Profile of Longitudinal Profile of High-speed Train Heads

中文关键词: Rhinoceros  二次开发  NURBS曲线  计算机辅助造型

英文关键词: Rhinoceros  secondary development  NURBS curve  CAS

中文摘要:

      目的 研究符合设计师在Rhinoceros软件中三维草图建模习惯的计算机辅助高速列车车头纵剖面最大轮廓线设计方法。方法 基于Rhinoceros二次开发高速列车车头纵剖面最大轮廓线辅助设计程序。分析曲线设计需求，根据NURBS曲线原理，将曲线控制点分为固定控制点、可左右水平移动控制点和可上下左右自由移动控制点三类，采用轮盘赌算法确定每个控制点的随机移动方向，根据产生的随机数和该控制点与相邻控制点距离最小值的乘积确认移动距离、移动控制点并生成若干NURBS曲线。结果 在给定曲线基础上快速批量生成足够变异的NURBS曲线设计方案，供设计师选择，且曲线可持续迭代。结论 相比此前对于基于NURBS建模的高速列车车头计算机辅助造型设计研究，在提高设计效率的同时，兼顾了设计师在Rhinoceros软件中的三维草图建模习惯。

英文摘要:

      The paper aims to study the computer aided design method for the maximum profile of the longitudinal profile of high-speed train head that conforms to the designer’s 3D sketch modeling habits in Rhinoceros software. A program for aided design of maximum profile of longitudinal profile of High-speed Train heads was developed secondarily based on Rhinoceros. The curve design requirements were analyzed. According to the NURBS curve principle, the curve control points were divided into three types: fixed control points, horizontally movable control points and freely movable control points. The roulette algorithm was used to determine the random moving direction of each control point. According to the random value generated in the roulette algorithm and the minimum distance from the adjacent control points, the moving distance was confirmed. The control points were moved and several NURBS curves were generated. Based on a given curve, a NURBS curve design with sufficient variation was generated in batches for designers to select, and the curve can be iteratively iterated. Compared with the previous research on the computer-aided design of high-speed train heads based on NURBS modeling, the design efficiency is improved, and the 3D sketch modeling habits of the designer in Rhinoceros software are taken into consideration.