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中文摘要：
针对椭球形高速列车头车的结构特点,介绍了一种应用非均匀有理B样条理论的头车数字化设计方法.根据二维数据创建了列车椭球形头部曲面的主控制线和辅助控制线,应用曲线曲率梳检测工具,通过调整控制点的位置,完成了控制曲线的调形与优化.大量彼此相切的非均匀有理B样条曲面片组成了列车头部外形曲面,将椭球形头部与后端的观光车进行了虚拟装配.通过定义几何模型、数学模型、边界条件以及网格划分等步骤,采用计算流体动力学方法计算了在不同速度时的钝体形列车与椭球形列车的空气阻力,结果表明椭球形列车具有良好的减阻作用.
英文摘要：
In view of the structural features of a head car with an ellipsoidal shape,a kind of digital design method based on Non-Uniform Rational B-Spline theory was proposed.This method first helped create the main and auxiliary control lines of the nose position according to its two-dimensional data and in the mean time changed the shape of control lines by adjusting the position of the control points with the help of the curve curvature comb tool.The ellipsoidal surface of the nose position was formed by a large number of Non-Uniform Rational B-Spline surfaces which are tangent to each other,and then the ellipsoidal nose and the sightseeing car were assembled in a virtual environment.The geometric and mathematical models and the boundary conditions were defined,and the aerodynamic drag of a blunt shaped train and an ellipsoidal shaped train was calculated at different velocities by computational fluid dynamic method.The results show that the ellipsoidal shaped one perform better in reducing aerodynamic drag.
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