面向概念设计的三维模型多条件组合检索研究

3D model multi-condition combined retrieval for conceptual design

针对单一检索条件难以满足产品概念设计阶段对三维模型模糊检索的问题,对铁路电气化行业中机电产品三维模型信息表达进行了分析,构建了基于功能形式化建模的零件库资源本体,在考虑语义距离、语义重合度、层次深度3个因素的基础上,对本体的语义相似度计算原理进行了研究,同时对产品类别、功能或特性进行了相似度计算,实现了以类别_功能_特性为检索条件的组合式扩展查询方案,提出了一种基于本体的三维模型多条件组合检索方法;最后介绍了三维模型检索系统的设计框架及实现,并以检索电子元器件中常用模型—某型号接触器为例进行了系统的实例验证。研究结果表明:利用本体的语义关系,该系统可以有效地支持三维模型的语义扩展检索,有助于模型的设计重用。

Aiming at the problem that a single retrieval condition was very difficult to meet the fuzzy retrieval of 3D model at the conceptual design stage,the information representation of three-dimensional model of electromechanical products in the railway-electrical industry was analyzed. And the resources ontology of parts library based on modeling of formal function was built. Based on the consideration of the semantic distance,semantic coincidence degree,and the depth level,the calculation principle of semantic similarity in ontology was studied.Meanwhile,the similarity of product category,function or characteristic was calculated,a combined and extended query program with the retrieval conditions of product category,function,or attributes was implemented. And a three-dimensional model multi-condition combined retrieval method based on ontology was proposed. Finally,the design framework and implementation of the three-dimensional model retrieval system was introduced. An example of retrieving a model of electrical product-a type of contact was presented to illustrate that program. The results indicate that program can effectively support the three-dimensional model retrieval of semantic extension by semantic relations of ontology,which can help design reuse of the model.