三维机身外形快速生成及表面分块

 本文提出了纵向放样线作锥线链的最小二乘法拟合,剖面外廓线作圆弧、椭圆弧及直线混合融合计算的三维机身外形生成方法。在SIEMENS 7.760机上建立了包含计算机绘图在内的FORTRAN程序。可以方便而快速地生成构形复杂的三维机身外形及气动力面元法分析所需的表面小块。几个算例证实了本法的通用性、快速性及简便性。程序发展后可能作为CAD中的图象主尺寸系统。

QUICK GEOMETRY GENERATION AND SURFACE MESH PARTITION FOR ARBITRARY 3-D BODIES

A method of the surface fitting of three-dimensional bodies is presented in this paper. The longitudinal lofting curves are a chain of conies generated by the least square fitting, whereas cross-sectional curves are hybrid blended conies which contain circular arcs, elliptic arcs and straight lines. A FORTRAN program involving the computer graphics on the SIEMENS 7.760 computer has been written. The program is capable of quick and handy generation of the complicated configuration of 3-D bodies and surface meshes required in the aerodynamic influence coefficient method. The applicability and validity are verified by some numerical examples. Further development of the program enables it to be a graphic master dimensional system for computer aided design.