A Study on a Product Modeling Available for CAD and CAM

在本研究中，研究了船舶数据建模在CAD和CAM中的可行性。该模型在船舶设计的第一阶段使用时应该非常简单，并且非常容易更改。同时，模型应该有相当的能力来表示分区、维度、精度等。在本研究中，建立了基础设计阶段的数据模型和为生产添加信息的系统。在第一阶段数据模型中，船舶结构用曲面集表示。它非常适合于船舶的基本设计，因为总的布置可以很容易地设计和改变。第二个系统可以将第一个系统得到的模型的详细信息赋予模型来表示零件。该系统基于面向对象编程，在Smalltalk-80环境下开发。将该系统应用于船舶简化结构中，验证了其能力。

In this research, the shipbuilding data modeling available for both CAD and CAM was investigated. The model should be very simple and very easy to change when it is used in the first stage of the ship design. At the same time, the model should have a considerable capability to represent partitioning, dimensions, precision and others.In this research, the data model for the basic design stage and the system to add the information for the production were made. As for the first stage data model, the ship structure was represented by the set of surfaces. It is very suitable for the basic design of the ship, for the general arrangement can be designed and changed very easily. And the second system can give the detailed information to the model obtained by the first system to represent the parts.The system was based on the object-oriented programming and made on the Smalltalk-80 environment. The system was applied to the simplified ship structure and exemplified its ability.