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Quantitative description method for assembly model during model retrieval

A quantitative description and assembly technology, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve the problems of low retrieval efficiency, improve retrieval efficiency, have little impact on retrieval algorithm complexity, and reduce algorithm effect of complexity

Active Publication Date: 2016-05-11
NORTHWESTERN POLYTECHNICAL UNIV
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Problems solved by technology

[0004] In order to overcome the deficiency of low retrieval efficiency of existing assembly model quantitative description methods, the present invention provides a model retrieval-oriented assembly model quantitative description method

Method used

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  • Quantitative description method for assembly model during model retrieval
  • Quantitative description method for assembly model during model retrieval
  • Quantitative description method for assembly model during model retrieval

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Embodiment Construction

[0043] refer to Figure 1-13 . The specific steps of the method for quantitative description of assembly model oriented to model retrieval in the present invention are as follows:

[0044]For each assembly model, this embodiment quantitatively expresses each part in the assembly model as a point based on the shape distribution, and expresses the assembly model in the form of a point set. After that, the similarity between the assembly models is obtained through the matching of the point sets, and the retrieval of the assembly models is completed. For the assembly model of lock chuck A, the specific steps are described as follows.

[0045] 1. Decompose the locking chuck A into 27 parts models.

[0046] 2. For the part model J, random sampling is adopted, and the distance between the sampling points is measured and counted, and the part is transformed into a point in the 1024-dimensional space to achieve the purpose of quantitative description of the part model. Specific ste...

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Abstract

The invention discloses a quantitative description method for an assembly model during model retrieval, which is used for solving the technical problem of low retrieval efficiency of a traditional quantitative description method for an assembly model. In the technical scheme, the quantitative description method comprises the following steps calculating a Euclidean distance between two arbitrary points on the surface of a part model; extracting a distance distribution histogram; expressing each part as a point in a 1024-dimensional space; carrying out separate and accurate quantitative description on the part model by using such point; expressing the assembly model as a set with a series of points, wherein each point expresses a part in the assembly model; and carrying out quantitative description on the assembly model in a point set mode. By the quantitative description method, the description accuracy is ensured, and meanwhile, a description result of the part model is only dependent on the model per se and is not affected by other factors; and compared with the background art, the quantitative description method has the advantages that the point set mode is used for quantitatively describing the assembly model, the complexity of a retrieval algorithm is reduced, and the retrieval efficiency is improved.

Description

technical field [0001] The invention relates to a quantitative description method of an assembly model, in particular to a model retrieval-oriented quantitative description method of an assembly model. Background technique [0002] Retrieving existing product models and reusing the design knowledge contained in the models is an effective means to reduce design work and improve product development efficiency. In engineering practice, most mechanical products exist in the form of assemblies. As a collection of parts, an assembly can integrally represent design information such as product functions and structures. Compared with parts, an assembly model can be used as an object to achieve a higher level of design reuse. The automatic retrieval of the assembly model by computer can significantly improve the reuse efficiency while carrying out design reuse, and one of the necessary links is to quantitatively describe the geometric information of the assembly model. At present, i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/13
Inventor 张杰王攀李原余剑峰李娜
Owner NORTHWESTERN POLYTECHNICAL UNIV
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