道路,机场CAD系统三维工程设计模型研究

针对国内道路ＣＡＤ系统中已有模型的局限性，通过分析国内外典型道路ＣＡＤ系统，并结合作者研究和开发ＣＡＤ系统的经验，提出了道路、机场ＣＡＤ系统中设计对象模型表达课题．指出：随着道路、机场建设规模的日益扩大，为增强ＣＡＤ系统的适应能力，提高软件开发水平，必须建立系统核心模型．文中对系统核心模型进行了较详细的研究，提出了系统核心模型的基本内容、总体框架结构和基本功能．同时结合机场ＣＡＤ系统软件的开发，使研究工作更具有实际意义．

Study of 3--Dimentional Core Model for Road and Airport CAD System

Aimed at the limitation of existing model in domestic road CAD systems, by analyzing some typical road CAD systems at home and abroad, and combined with the authors' experiences during researching and developing CAD system, the problem about model expression of design object is presented. It is pointed out that with the increasing extension in scale in the construction of highways and airports, in order to strengthen the adaptability of CAD system and to raise the developing level of software, it's found necessary to establish a core model of system. This paper, based on computing geometry and data structure theory, studies the core model of systems in detail and suggests its fundamental content, general structure and fundamental function. At the same time, the research is closely combined with the development of airport CAD software so that it is more practical.