Blank model complex feature hierarchical identification method based on feature matrix

Abstract

The invention provides a blank model complex feature hierarchical identification method based on a feature matrix, and the method comprises the steps: firstly recognizing and removing the pseudo features and data of a large-scale complex component blank model through employing a threshold segmentation method, and carrying out the optimization of the blank model; then, constructing an attribute adjacency graph of the optimized blank model, adopting a layering recognition method to carry out layering processing on the intersecting characteristics of the optimized blank model of the component, obtaining a single characteristic, and calculating a characteristic matrix of the single characteristic; converting the multiple types of single features into a feature matrix, and establishing a feature matching library; and finally, matching the feature matrix with a feature library so as to accurately identify model intersection features. Instance verification is carried out on a blank model withmultiple characteristics of the cabin part, and feasibility and effectiveness of the algorithm are verified respectively by accurately identifying multiple types of characteristics. And multi-level complex intersection feature recognition of large cabin type components based on blank model topological information is realized.

Description

technical field [0001] The invention belongs to the technical field of digital design and manufacturing, and in particular relates to a method for recognizing large and complex blank models. Background technique [0002] Large-scale cabin parts are key components of aerospace vehicles such as large commercial aircraft, fighter jets, and launch vehicles. Taking the inter-stage cabin as an example, as the connecting part of the rocket body, it has a great impact on the overall dynamic characteristics, flight resistance and flight speed. have an important impact. The importance and particularity of the function of such parts make them usually complete integrated components. With the gradual improvement of the service performance requirements of aircraft, the structural design features of such large and complex component parts have many complex internal intersecting features such as bosses and cavities, and become more complex, and the rough model surface also has randomly dist...

AI Technical Summary

Problems solved by technology

[0009] The technical problem to be solved by the present invention is that it is difficult to realize the efficient and accurate analysis of complex cavity features of blank models or workpiece models, especially large-scale cabin-like component blank models or workpiece models with a large number of bosses and mouth frames. To solve the technical problem of recognition, provide a layered recognition method of complex features of blank model based on feature matrix, so as to realize high-precision and fast recognition of complex intersecting features

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