包含产品几何与非几何信息的产品装配要求是装配工艺设计的主要依据，对装配工艺设计决策结果具有决定性的影响。在装配工艺模型中描述产品的几何相关信息能够更好地表达如装配顺序，装配路径等内容，同时可以更好地辅助装配工艺决策，提高决策的自动化水平。提出一种几何增强的装配工艺本体模型，利用语义本体技术，建立产品几何信息在装配工艺中的描述方法，数据结构与关系描述。并以该模型为基础，建立基于几何增强装配工艺本体的装配工艺决策框架。该框架分为两部分：一是采用几何增强的装配工艺本体模型描述产品几何信息和装配工艺信息的数据结构和相互关系；二是为了让几何信息与装配工艺信息之间存在的丰富的隐含关系显性化，对语义本体推理机制进行增强，提出推理单元的概念，使决策框架具有从产品几何信息中推理装配工艺相关信息的能力，有效地支持装配工艺决策。以针对某传动器产品装配顺序决策的过程，验证所提出的几何增强装配工艺本体模型与框架的有效性。
Product assembly requirement that includes geometric and non-geometric information is the main reference for assembly process planning, thus has a significant influence on the result of decision making on assembly process plan. The more geometric information there is in the assembly process model, the more abundant the assembly process information such as assembly sequence and assembly path can be described, the better these data can support the assembly process decision making to improve the automation level of assembly process decision making. A geometric enhanced ontology model for assembly process is proposed to establish description, data structure for product geometric information by semantic ontology technology in assembly process planning. Then the geometric enhanced assembly process ontology model framework is proposed based on the ontology model. The framework can be divided into 2 parts, product geometric information and assembly process plan information and their relations in assembly process planning is depicted at first by the ontology model. Then the concept of reasoning unit is proposed to enhance the existing ontology reasoning capability so that the enhanced ontology model can be able to reason the complicated existing implicit relations between geometric information and assembly process plan and make these relations explicit and to support the decision making effectively in assembly process planning. An assembly sequence decision making problem for a transmission under the enhanced ontology model framework is illustrated to validate the effectiveness of the geometric enhanced ontology model for assembly process planning and the framework.
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