本文着重研究虚拟原型技术中的两个关键问题：产品概念设计建模、虚拟特征生成及其主要实现技术。
This paper addresses the following techniques: product modeling in conceptual design, virtual feature generation, and some important implementation techniques of them.
探讨了面向概念设计的产品虚拟三维装配建模过程和三维建模方法，提出了面向概念设计阀门装配CAD设计与仿真的思想和方法。
The method and technology of virtual 3d assembly are discussed, and the method of the valve assembly CAD design and emulation concept-oriented design is pointed out in the paper.
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