开孔曲面自动铺放轨迹规划算法研究

为解决开孔曲面自动铺放轨迹规划问题,提出在前处理中将孔边界内外的曲面接合成完整曲面的方法,采用STL文件提取网格化曲面信息并重构开孔曲面拓扑,按照设定算法获得“连续”的铺放轨迹后,再按孔边对轨迹点进行信息整理得到后置处理所需的最终铺放轨迹点信息.研究了迭代法和投影法在轨迹线与孔边界交点的求取方法,综合比较2种算法的效率和精度后,发现投影法更适于开孔曲面的轨迹规划.根据上述算法,编写了基于VC++ 6.0平台的轨迹规划程序,以整体复合材料前机身为例进行算法验证,证明了提出的开孔曲面自动铺放轨迹规划算法的合理性和正确性.

Research on Trajectory Planning Method of Automated Tape Laying and Automated Fiber Placement for Surfaces with Holes

A novel algorithm is presented to generate the trajectories for surfaces with holes during the process of automated tape laying (ATL) and automated fiber placement (AFP). In preprocessing, the surfaces in and out of the hole boundaries should be joined into a whole surface without any holes. The surface information can be obtained by STL (Stereo Lithography) files, and the topological reconstruction method is introduced for surfaces with holes as well. Then the "constant" trajectories can be planned within a chosen algorithm in the very whole surface, and the messages of trajectory points should be refined by the outlines of the hole boundaries. For boundary treatment, two methods are proposed: the "iteration method" and the "projection method". Their efficiency and precision are discussed, and the projection method is found to be more appropriate. Finally, the algorithm is realized by VC++ 6.0 programming, and verified on a composite front fuselage. The results show that the method is valid and effective.