航空发动机叶片数字化再制造方法研究

叶片作为航空发动机的关键部件,其数字化三维模型等核心技术资料一直由国外发动机厂商垄断。为获取航空发动机叶片的三维数字化模型,提出一种基于海量点云数据的叶片数字化模型重建方法。利用激光扫描仪获取的叶片点云数据;在点云数据预处理部分,进行点云对齐并合理精简;将点云数据截面转化为含有噪声的时域信号进行滤波,引入单树小波包分析方法,并通过坐标变换将其分割为叶盆面和叶背面;依据叶片的型面特点,采用不同方法对叶片截面边界进行拟合。反复上述过程,采用蒙面曲面的方法建立叶片数字化三维模型。实验结果表明,利用该方法建立的发动机叶片模型具有良好的光顺性和几何精度,明显提升了建模效率。

Research on Digital Remanufacturing Method of Aircraft Engine Blades

Blade is one of the most important components of aircraft engine, its three dimensional (3D) digital model is always monopolized by foreign engine manufacturers. In order to obtain 3D digital model of an aircraft engine blade, a method on blade digital model reconstruction was put forward based on mass of point cloud data. Blade point cloud data was collected by using laser scanner. In the pre processing part of point cloud data, alignment and simplification were done. After point cloud data cross section was converted into time domain signal, filtering was done by introducing single tree wavelet packet analysis method, and it was divided into the basin and back surface of blade through the coordinate transformation. According to the type of blade surface characteristics, boundary fitting was done for the cross section of blade by using different methods.Repeated the above mentioned processes, the 3D digital model of blade was established by using skinning surface method. The experimental results show that the model of blade by above method has good smoothness and accuracy, and the modeling efficiency is improved significantly.