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A Retrieval Algorithm of Sheet Metal Parts Based on Relationships of Features 被引量:3
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作者 WANG Dawei YAN Guangrong +1 位作者 LEI Yi ZHANG Jiaying 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2012年第3期453-472,共20页
With the rapid increase in the number of three-dimensional (3D) models each year, to quickly and easily find the part desired has become a big challenge of enterprises. Meanwhile, many methods and algorithms have be... With the rapid increase in the number of three-dimensional (3D) models each year, to quickly and easily find the part desired has become a big challenge of enterprises. Meanwhile, many methods and algorithms have been proposed for part retrieval. However, most of the existing methods are designed lbr mechanical parts, and can not be well worked for sheet metal part re- trieval. An approach to feature-based retrieval of sheet metal parts is presented. Firstly, the features frequently used in sheet metal part design are chosen as the "'key words" in retrieval. Based on those features, a relative position model is built to express the different relationships of the features in 3D space. Secondly, a description method of the model is studied. With the descrip- tion method the relative position of features in sheet metal parts can be expressed by four location description matrices. Thirdly, based on the relative position model and location description matrices, the equivalent definition of relationships of two feature groups is given which is the basis to calculate the similarity of two sheet metal parts. Next, the tbrmula of retrieval algorithm for sheet metal parts is given. Finally, a prototype system is developed to test and verify the effectiveness of the retrieval method suggested. Experiments verify that the new method is able to meet the requirements of searching sheet metal parts and possesses potentials in practical application. 展开更多
关键词 CAD sheet metal retrieval algorithm features search 3D model
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Similarity Search Algorithm over Data Supply Chain Based on Key Points 被引量:1
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作者 Peng Li Hong Luo Yan Sun 《Tsinghua Science and Technology》 SCIE EI CAS CSCD 2017年第2期174-184,共11页
In this paper, we target a similarity search among data supply chains, which plays an essential role in optimizing the supply chain and extending its value. This problem is very challenging for application-oriented da... In this paper, we target a similarity search among data supply chains, which plays an essential role in optimizing the supply chain and extending its value. This problem is very challenging for application-oriented data supply chains because the high complexity of the data supply chain makes the computation of similarity extremely complex and inefficient. In this paper, we propose a feature space representation model based on key points,which can extract the key features from the subsequences of the original data supply chain and simplify it into a feature vector form. Then, we formulate the similarity computation of the subsequences based on the multiscale features. Further, we propose an improved hierarchical clustering algorithm for a similarity search over the data supply chains. The main idea is to separate the subsequences into disjoint groups such that each group meets one specific clustering criteria; thus, the cluster containing the query object is the similarity search result. The experimental results show that the proposed approach is both effective and efficient for data supply chain retrieval. 展开更多
关键词 data supply chain similarity search feature space hierarchical clustering
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