基于高参数均匀性的叶片曲面光顺造型方法  

Smooth Modeling Method With Uniform Parameters for Blade Surface

作　　者：田野 宁涛[2] 陈志同[1] TIAN Ye;NING Tao;CHEN Zhitong(Laboratory of Advanced Machining Technology of Sculptured Surface,School of Mechanical Engineering and Automation,Beihang University,Beijing 100191,China;Laboratory of Aircraft Manufacturing Engineering,School of Mechanical Engineering and Automation,Beihang University,Beijing 100191,China)

机构地区：[1]北京航空航天大学机械工程及自动化学院复杂曲面先进加工技术实验室,北京100191 [2]北京航空航天大学机械工程及自动化学院飞行器制造工程实验室,北京100191

出　　处：《航空制造技术》2023年第3期61-69,共9页Aeronautical Manufacturing Technology

基　　金：国家重大项目(GJXM92579)。

摘　　要：为进一步优化叶片的曲面模型质量,提出一种基于高参数均匀性的叶片曲面光顺建模方法。首先根据叶片的曲率特征,将单层数据点分成叶盆、叶背、前缘和后缘4个部分,通过叶片前缘和后缘的曲线拟合,获得拟合圆圆心,并以此生成叶片中弧线的诱导曲线。进而通过改进的牛顿迭代法获得一系列叶片截面轮廓线内切圆圆心,从而获得中弧线,对中弧线进行光顺处理以及弧长参数化,并利用中弧线-厚度分布的方式,结合过渡曲线生成光顺的截面轮廓线,保证过渡处曲率连续。最后,通过放样及融合优化算法快速自动地生成光顺的叶片曲面模型。利用该方法对某型号发动机叶片数据点进行曲面造型与加工验证,结果表明,优化后的曲面模型具有良好的光顺性,避免了由于模型不光顺导致的刀轨波动问题。In order to further optimize the quality of the blade surface model,a blade surface smooth modeling method with uniform parameters is proposed.First,according to the curvature characteristics of the blade,the data points of each layer of section curves are divided into four parts:pressure side of blade,suction side of blade,the leading edge and the trailing edge.The center of the circle is used to generate the induced curve of the camber curve of the blade.Then,a series of inscribed circle centers of the profile of the blade section are obtained by the Newton iteration method,so as to obtain the camber curve,which is smoothed and arc length parameterized.Using the method of camber curve-thickness distribution,combined with the transition curve to generate a smooth cross-sectional contour curve to ensure the continuous curvature.Finally,a smooth blade surface model is generated by lofting and fusion optimization algorithms.This method is used for model construction and processing of data points of a certain engine blade.The result analysis shows that the optimized surface model has better smoothness,which avoids the problem of tool path fluctuation caused by the unsmooth model.

关 键 词：航空发动机叶片 参数均匀 光顺造型 弧长参数化 曲率连续 

分 类 号：V263[航空宇航科学与技术—航空宇航制造工程]