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文章编号:——
基于网格特征临界点的三维工程模型检索算法
11211
.哈尔滨工业大学机电工程学院,黑龙江哈尔滨;
2哈尔滨 150001)
摘要:为有效检索并重用现有三维模型及相关设计知识,针对工程三角网格模型,提出了一种与计算机辅助
Morse
率作为光滑实值函数,计算网格特征临界点;采用两临界点间近似测地距离和顶点法矢夹角余弦值作为联合形状
函数,按照极大值点、极小值点和鞍点,分别计算同类临界点间的联合形状函数得到形状分布,从而将模型的比较
映射为形状分布矩阵的比较。在普渡大学建立的工程标准模型库上对算法进行了验证和比较。实验结果表明,本
算法客观反映了工程模型的相似程度。明显提高了基于图形分布检索算法的有效性。
关键词:网格;工程模型检索;形状分布;特征临界点;近似测地距离;离散曲率;计算机辅助设计
TP391A
engineering model retrieval algorithm based salient
HOUXinlZHANG—薄 Wen-jianl
. EngineeringHarbinInstitute , 1 珻;
2School ScienceTechnologyHarbinInstitute , ,
: effectively and reuse model and knowledgeaiming the —
ing 琤 salient pointsa engineering retrieval algorithm was ,
which was independent Aided 瓵 the Morse theorythe
the was the calculate salient . the
approximate between two and the corresponding value the angle
the two the Shape 甋 distributions generated
computing the USF class pointsiemaximumminimumand,.
the was the corresponding shape .—
periments conducted the algorithm utilizing the Engineering Shape
developed . results suggested the technique effectively —
fleeted the among engineering modelsandthe retrieval performance was significantly .
Key 篻籩 model 籹 distributionsalient pointsapproximate dis
puteraided
20080116#20080428Received epted Apr2008
(D0420060521)FoundationitemProjectsuppor