基于逆向工程的航空发动机叶片三维重建模型构建

3D Reconstruction Modeling Construction of Aeroengine Blades Based on Reverse Engineering

为精准控制航空发动机叶片型面数据,设计出更符合实际应用需求的发动机叶片,针对基于逆向工程的航空发动机叶片三维重建模型构建方法展开研究;按照逆向工程原理,采集三维数据样本,并根据误差修正条件,定义发动机叶片三维数据的拓扑关系,从而分析三维数据样点的邻域形式,实现航空发动机叶片三维数据的邻域构建;实施对三维数据的点云拼接处理,遵循三维拟合原则,提取完整的发动机叶片边界,再根据三维重建节点配置需求,确定重建四元数的取值范围,推导具体的重建模型表达式,完成基于逆向工程的航空发动机叶片三维重建模型的构建;实验结果表明,上述模型的应用可以保证建模时标志点、三维重建后标志点间的坐标误差不超过0.5 mm,符合精准构建航空发动机叶片的实际应用需求。

In order to accurately control the surface data of aeroengine blades,and meet practical application requirements of engine blades,this paper studies the 3D reconstruction model construction method for aeroengine blades based on reverse engineering.According to the principle of reverse engineering,collect the 3D data samples,and define the 3D data topological relationship with engine blades according to the error correction conditions,so as to analyze the neighborhood form of the 3D data samples and realize the 3D data neighborhood construction of aeroengine blades.Implement the 3D data point cloud splicing processing,follow the 3D fitting principle,extract the complete engine blade boundary,determine the range of the reconstructed quaternion according to the 3D reconstruction node configuration requirements,derive the specific reconstruction model expression,and complete the 3D reconstruction model of the aeroengine blades based on reverse engineering.Experimental results show that the coordinate error of the above model between the landmarks during modeling and the landmarks after the 3D reconstruction does not exceed 0.5 mm,which meets actual application requirements for precise construction of aeroengine blades.