零件建模和装配建模是产品建模的两个方面，对制造企业的竞争力有重要影响。在当前的计算机辅助设计系统（Computer-aided design，CAD）中，尽管两者已高度集成，它们在过程层面仍然存在相互割裂的现象。为此，提出一种基于结构预映射（Structure pre-mapping，SPM）的产品建模方法。首先对产品建模过程及SPM进行系统分析，明确实现SPM需要完成的主要任务；其次，详细阐述SPM的内涵，并对其进行形式化定义，以便于在CAD系统中描述；第三，基于前期发展的装配特征偶概念，对存在于设计者头脑中的设计意图（表现为抽象配合结构和配合行为）进行系统建模，形成实现SPM的基础；第四，提出基于SPM的产品建模原理，进而展示相应的框架，并分析框架的功能模块及其实现方法；最后，通过HP发动机空气过滤器头部组件的产品建模实例论证方法的可行性。该方法可在过程层面上提高产品建模的集成程度，对于现有CAD建模理论和技术体系的丰富和发展有一定的积极意义。
Part modeling and assembly modeling are two aspects of product modeling, which greatly influence industrial completeness. Although the two aspects are highly integrated in current computer-aided design (CAD) systems, they are separated when concerning the perspective of process. To alleviate the issue, a product modeling method based on the phenomenon of structure pre-mapping (SPM) is proposed. Firstly, systematical analyses are conducted to study the product modeling process and the tasks needed to fulfill SPM. Secondly, the key characteristics of SPM are demonstrated and formalized to facilitate its description in CAD systems. Thirdly, the previously developed concept of assembly feature pair is used to model the design intent existed in human brain, including the abstract mating structure and behavior, providing a solid ground for realizing SPM. Fourthly, the principle of product modeling based on SPM is revealed, and a corresponding framework is presented, with its functional modules and their realization being discussed. Finally, the modeling of a head assembly (which is a component of a HP engine) is used to demonstrate the feasibility of the proposed method, which can reinforce the integration of part modeling and assembly modeling from the perspective of process, thus enriching and facilitating the development of CAD modeling theory and technology systems.
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