机械装配体模型的对称性识别

发布时间：2018-01-21 12:54

本文关键词： 装配体模型零件自对称零件间对称全局对称划分零件集合并对称　出处：《机械工程学报》2017年09期 　论文类型：期刊论文

【摘要】：为满足产品创新设计和工程分析中对模型对称性信息的需求,针对现有的机械装配体模型对称识别研究不足的问题,提出了一种识别机械装配体模型中的零件自对称、零件间对称和装配体全局对称的方法。通过遍历特征设计树识别装配体所包含的零件,根据零件复制关系及面属性划分零件集,并按照零件数量排序,使对称合并结果快速向装配体全局对称靠拢。利用模型的特征信息,识别零件自对称,获取其旋转对称轴和反射对称面。根据零件质心和包围盒数据识别零件间的旋转、反射和平移对称,在零件集内部和零件集之间依次合并对称,最终判别装配体是否全局对称。实验表明,该方法能够准确地识别零件自对称、零件间对称和装配体全局对称。
[Abstract]:In order to meet the needs of model symmetry information in product innovation design and engineering analysis, the existing problems of mechanical assembly model symmetry recognition are insufficient. In this paper, a method of identifying parts self-symmetry, inter-part symmetry and assembly global symmetry in mechanical assembly model is proposed. The components contained in assembly are identified by traversing the feature design tree. The part set is divided according to the copy relation and the surface attribute of the part, and sorted according to the number of parts, which makes the result of symmetry merge fast to the global symmetry of the assembly body. Using the characteristic information of the model, the self-symmetry of the part is recognized. The rotation symmetry axis and the reflection symmetry surface are obtained. The rotation, reflection and translation symmetry between the parts are identified according to the data of the part center and the bounding box, and the symmetry is merged between the parts set and the part set in turn. The experimental results show that the method can accurately identify the self-symmetry, inter-part symmetry and global symmetry of the assembly.
【作者单位】：大连理工大学机械工程学院;
【基金】：国家自然科学基金资助项目(61572101)
【分类号】：TH122
【正文快照】： 0前言*零件自身的对称、零件之间的对称和装配体的对称广泛应用于产品分析、设计中的零件识别、零件匹配及装配体模型定位[1-2]。根据装配体的全局对称性能够评估模型设计的合理性,便于对装配体模型中各零件布局进行优化设计[3-4]。在工程分析中,利用模型的对称信息,通过分析

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