After analyzing the current algorithms , the problems existed in them and the root reasons lying behind are discussed . then the primitive recognition and interpretation are taken as the research emphasizes of this dissertation 本文通过对已有工程图样理解算法的分析，探讨了其中存在的问题及其原因，将研究内容重点放在基元体的识别、理解方面。
The main process includes performing high - level analysis of the drawing information on vector data in 2d orthographic form , mining engineering semantics from the drawing information , and obtaining the corresponding information of primitive by using engineering semantics 在矢量数据的基础上，对工程图样图形信息进行高层分析和理解，挖掘出其中所蕴涵的工程语义，用于基元体相关信息的获取。
The classification - based acquisition technique of engineering semantics is presented . on the base of engineering semantics classification , the contribution of different kind of semantics and the relationships among them in edi are analyzed 在工程语义分类基础上，探讨了三类工程语义在基于工程图样的产品信息获取中的作用和关系，即表达方式语义是前提，投影关系语义是核心，尺寸约束语义是引导。
Through analyzing the data of engineering drawings and the data flowing in drawing files management process , the dynamic drawings information database is bulit after setting up the information model . the third , the simple relation model of drawing objects is developed 第二，对工程图样数据的特点进行了深入研究，分析了图档管理过程中的数据流向，并在对pdm系统图档管理思想进行探讨的基础上，采用关系型数据模型，建立了动态图档信息库。
Being a kind of important technical archives for engineering design , manufacturing , use and maintenance , engineering drawing is an indispensable tool for technical exchanges in case of the current development level of science and technology and thus called “ common technical language in engineering ” 工程图样是进行技术交流的不可缺少的工具之一,就当代科学技术水平而言，工程图样仍是工业生产中进行设计、制造、使用、维修时的重要技术文件，有“工程界共同的技术语言”之称。
The main work of the dissertation is as follows : the knowledge - based granularity analysis method of engineering drawing information is put forward by introducing the concept of granularity into the process of edi . this method is composed of three main steps , namely cognition - based decomposing of drawing interpretation goal , object - oriented partitioning of knowledge and knowledge - directed classification of drawing information 论文的主要工作包括以下几个方面：将粒度的思想引入到工程图样理解的分析和研究中，提出基于知识的工程图样信息粒度分析方法，该方法分为三个步骤，基于认知的图样理解目标分解、面向理解子目标的知识划分、基于知识引导的图样信息分类。
This paper researches laying out mode and procedure of manual drawing , describs in bfn constructing elements and their structure of working drawing , and determines factors which affect drawing effect . it introduces simply that functions of an interactive drawing software , which are basic and special laying out characters , methods of modification and logical order of normal drawing . also an example is given . the paper formulates out a helpful method with which engineering drawing is drawed under interactive system 研究了传统绘图模式的构图方式和过程，用巴科斯范式描述了零件图的构图元素与结构，确定了影响绘图效率的因素.文中简要介绍了交互图形软件具有的基本的和特有的功能，在交互绘图中的构图特点，图形的生成与修改，一般作图的逻辑顺序，同时给出了示例.该文归纳出用交互图形系统生成工程图样的便捷方法
The main contributions are included as follows : the first , meta - data technique is introducted into the field of drawing files management , and the overall structure scheme of " engineering drawing files management system based on autocad 2000 " is proposed . the second , the idea of pdm is discussed 论文所作的工作包括以下几个方面：第一，在对各种图档管理技术进行研究的基础上，提出了采用元数据对象管理技术管理工程图样的总体思想，并对以面向对象、面向设计过程、动态管理为核心的基于autocad2000平台的工程图档管理系统的总体结构方案进行了设计。
In the dissertation , the application of drawing files management technique and characteristics of the engineering drawings are analyzed . the general structure , integrated frame and information model about the integrated software system - - - - - - " engineering drawing files management system based on autocad 2000 " are researched 本论文对目前的多种图档管理技术进行了具体深入的研究，结合工程图样数据的特点，借鉴pdm系统管理图档的思想，设计开发了一套基于autocad2000平台的工程图档管理系统。
After studying the relations in drawing files and between files , the objects " relation definition and modification in files and between files are brought out . the fourth , some programme modules of autocad 2000 are designed to draw the forms in the engineering drawings automatically 第三，深入研究了相关的工程图样技术，通过对工程图档间的联系及图档内容间的关联的分析，确定了关联对象的模型，并实现了图档文件内、图档文件间对象的相关定义及修改自动提示。
