Assembly model similarity retrieval method based on spatial point set matching

Abstract

The invention relates to an assembly model similarity retrieval method based on space point set matching, which aims at the assembly model retrieval requirement, retrieves some assembly characteristics fitting the design requirement, acquires related product information in the design and manufacturing process, and applies the product information to an assembly model to be designed. The method comprises the following steps: firstly, calculating a feature attribute similarity matrix of a selected model, and performing point multiplication with each attribute weight matrix to obtain an attributecomprehensive similarity matrix; finding effective elements of each column in the matrix, and forming a part set capable of being matched through permutation and combination; solving a spatial position similarity matrix; calculating the attribute comprehensive similarity matrix and the spatial position similarity matrix according to a formula to obtain a comprehensive similarity matrix; obtaininga model similarity matrix; summing elements at corresponding positions of the matching part set and the model similarity matrix to obtain a similarity value; wherein the value of the maximum similarity of the matching part set is the similarity between the model and the reference body.

Description

Technical field: [0001] The invention relates to a retrieval method for model similarity, in particular to an assembly model similarity retrieval method based on spatial point set matching. Background technique: [0002] As an important data source for the design and manufacture of complex products, the assembly model is also a basic data source that needs urgent attention during the strategic transformation process from "Made in China" to "Created in China". Under the background of the widespread use of digital design technology, various manufacturing industries have accumulated a large number of assembly models, and the information of these assembly models contains a lot of information such as engineering analysis and formulation of process regulations. How to fully explore the effective information in the existing models and Reuse is one of the important ways to reduce repetitive labor, shorten product development cycle, and improve product design and manufacturing level....

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a similarity retrieval method for assembly models based on spatial point set matching, which overcomes the need for a certain amount of manual intervention in the prior art for assembly models and their part coding, which is difficult to automatically generate effectively and Assembly model description and search criteria are relatively simple, and can only be applied to the problem of assembly model search in specific scenarios. The present invention aims at the retrieval requirements of assembly models, and obtains design and manufacturing characteristics by retrieving certain assembly characteristics that meet design requirements. process relevant product information and apply it to the assembly model to be designed

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