【摘要】 针对自上而下的计算机辅助机械产品图形设计 ,提出了适应这种设计思维的特征设计方法 ,即选择合适的形状特征 ,作为进一步的详细设计的基准。这种分层设计的方法 ,反映了所设计对象各个部分的内在逻辑关系 ,符合实际设计的思维方式。另外 ,对特征的概念做了简单的探讨 ,提出了设计分为结构设计和特征属性设计的观点。还简要探讨了应用二维特征进行设计的概念和方法更多还原

【Abstract】 In the light of using top down method in the design of product with CAD, a method of feature design, which chooses proper shape feature as the datum for next design step, is presented. The method reflects the inner logic of the part of the system being designed, coincide with true design process. With the comparing of the concept of feature and the concept of class which is used in object origin program language, the conclusion is that the layer of feature and the layer of class are in some degree equivalent. Then the concept of feature is simply discussed, and a viewpoint of design, which can divide into two way: structure design and property design, is presented. Further more, the concept and method of application of two dimensional shape feature are simply discussed.更多还原