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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.
According to the structural characteristics of elliptical high-speed train, a digital car head design method based on non-uniform rational B-spline theory is introduced.According to two-dimensional data, the main control line and auxiliary control line , The curve shape comb detection tool is used to adjust and control the position of the control points to complete the shape and optimization of the control curve.A large number of non-uniform rational B-spline patches tangent to each other form the train head profile surface, the ellipsoidal head The Ministry and the back-end sightseeing car were virtual assembled.According to the definition of geometric model, mathematical model, boundary conditions and meshing, the computational fluid dynamics method was used to calculate the air of bluff-body trains and ellipsoidal trains at different speeds The results show that the elliptical trains have a good drag reduction effect.