消声瓦几何生成的二次开发

利用测地线进行消声瓦布置三维设计中各种特征曲线的生成。对测地线的生成途径进行了总结分析，并利用测地线几何性质给出了一种求测地线及消声瓦边界曲线的快捷算法。按照工程要求，提出了一种消声瓦在曲面上布置的整体规划方法，该方法将艇体各级纵向基准线作为消声瓦约束和排列的基础，并给出了通过求曲线在曲面上等距线的方法生成基准线。在通用AutoCAD及MDT平台上利用Visual LISP语言进行了二次开发和典型艇体验证，该方法满足工程应用要求。

Program Development for Geometrical Generation of Anechoic Tile

In this paper, geodesic theory is applied to generate various characteristics curves for 3D design, of which anechoic tile is laid out. By summarizing the approaches of generating geodesic, a shortcut algorithm for calculating geodesic and boundary curve of anechoic tile utilizing the geometrical characteristics of geodesic is developed, hence an integrated method of spherical layout for anechoic tile on the surface of submarine is put forward according to the program requirements. The lengthwise datum lines of various levels are used as the constraints and a basis of the arrangement for anechoic tile. In addition, the generating method by calculating the offset curve on the surface, which derived from the appointed initial curve, is introduced. Further, the program developing on the general AutoCAD and MDT system is realized in Visual LISP language, and the validation of typical submarine hull is carried out. It is proved that this method is satisfactory to the engineering application.