OBJECT ORIENTED DATA MODELLING WITH APPLICATIONS TO CAD  

CAD中面向对象数据建模的应用

作　　者：应维云[1] 傅向阳[1] 周儒荣[1] 

机构地区：[1]南京航空航天大学机电工程学院

出　　处：《Transactions of Nanjing University of Aeronautics and Astronautics》1996年第2期69+63-68,共7页南京航空航天大学学报（英文版）

摘　　要：An object oriented data modelling in computer aided design (CAD) databases is focused. Starting with the discussion of data modelling requirements for CAD applications, appropriate data modelling features are introduced herewith. A feasible approach to select the “best” data model for an application is to analyze the data which has to be stored in the database. A data model is appropriate for modelling a given task if the information of the application environment can be easily mapped to the data model. Thus, the involved data are analyzed and then object oriented data model appropriate for CAD applications are derived. Based on the reviewed object oriented techniques applied in CAD, object oriented data modelling in CAD is addressed in details. At last 3D geometrical data models and implementation of their data model using the object oriented method are presented.着重讨论CAD数据库中面向对象的数据建模。由CAD应用对数据模型的需求，导出合适的数据建模特点。选择最好的数据模型的柔性方法是分析数据库存贮的数据，使应用环境的信息能很容易地映射到相应的数据模型上。通过分析相关数据，得出面向对象的数据模型在CAD中的应用，并详细讨论其数据建模方法。最后通过应用实例。

关 键 词：computer aided design DATABASES data models object  oriented data models complex objects geometrical models 

分 类 号：V260.5[航空宇航科学与技术—航空宇航制造工程]