汽车弯管曲面的整体造型设计研究

Global Modeling for Automobile Elbow Surface

提出采用单叶双曲面作为控制曲面,建立汽车弯管过渡曲面方程的方法。该方法增加了过渡曲面造型的自由度,且能保持其几何造型的特征,其生成的过渡曲面表达式简单、统一且次数较低,形状可以控制。通过对弯管的应力分析,在圆环面与小圆柱面接合处和小圆柱面与过渡曲面的接合处以及过渡曲面与大圆柱面的接合处应力突变都很小,该弯管的弯曲效应好,比较适合于现代纤维缠绕技术,对汽车弯管设计制造具有重要意义。

For keeping geometric modeling characteristics of the elbow,the equation of blending surfaces for automobile elbow is established by using hyperboloid of one sheet as control surface.Adjustable function of controlling parameter increases freedom of blending surfaces modeling.The equation of blending surfaces is simple,uniform and low in degree.The shape of blending surfaces is controllable.Sudden changes of stresses at three conjunctions,i.e.the conjunction of anchor ring and small circular cylinder,the conjunction of small circular cylinder and blending surfaces,and the conjunction of blending surfaces and big circular cylinder,are all very small through analysis of stresses of the elbow.It illustrates that bending effect of the elbow is good.This method is fit for modern fibre winding technology.It is important for designing and manufacturing of automobile elbow.