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针对高性能航空透明件等大型卷曲曲面逆向工程测量的便利性、建模效率与精度的需要,提出了一类大型卷曲复杂曲面的B样条精确建模方法。首先利用高精度激光跟踪仪得到卷曲模型的系列截面数据,采用迭代算法计算出用于数据参数化的点集回转轴线,实现了各截面数据的序化;其次,为保证模型边界的准确性和样条曲面等参数线不发生扭曲,提出了点集的边界延拓方法,形成了双向有序的建模数据。最后,为提高样条曲面的控制点阵列和满足下游加工操作的需要,提出了采用截面扫略技术实现该类大型复杂曲面的单张曲面建模。实例验证了该方法的有效性和可行性。
Aiming at the requirements of reverse engineering measurement of large crimp surface such as high performance aviation transparent parts and the need of modeling efficiency and precision, a precise B-spline modeling method for large crimp complex surface is proposed. First of all, a series of cross-section data of the curled model is obtained by using a high-precision laser tracker. An iterative algorithm is used to calculate the rotation axis of the point set for data parameterization, and the data of each section is sequenced. Secondly, Spline curves and other parameters of the line does not distort, the proposed point set boundary extension method, the formation of a two-way orderly modeling data. Finally, in order to improve the control point array of spline surface and meet the needs of downstream processing operations, the paper proposes the use of cross-sectional scanning technology to realize the single sheet surface modeling of such large complex surfaces. The example verifies the effectiveness and feasibility of the method.