Complex curved surface regional measuring point planning method

Abstract

The invention relates to a complex curved surface regional measurement point planning method, which comprises the following steps of: 1, selecting a certain complex curved surface, carrying out parameterized curved surface fitting, carrying out differential geometry definition on a fitting result to obtain a Gaussian curvature and an average curvature of data points on the complex curved surface, and dividing the obtained complex curved surface into a plurality of gentle regions and sudden change regions according to curvature characteristics; 2, curvature extreme points and curved surface extreme points which reflect curved surface information are set as feature points; and 3, based on the feature points in the step 2, calculating the maximum main direction and the minimum main direction of the data points on the curved surface, and searching the feature points at the sharp change region of the complex curved surface by using the obtained maximum main direction and the minimum main direction to complete the regional measurement point planning of the complex curved surface. According to the method, better fitting precision is achieved in the sudden change area of the complex curved surface, and the detection precision of the complex curved surface is improved.

Description

technical field [0001] The invention belongs to the technical field of detection, and in particular relates to a planning method for sub-area measuring points on complex curved surfaces. Background technique [0002] With the continuous development of modern industries such as aerospace and national defense technology, more and more parts are in the form of complex curved surfaces, such as propeller blades, aeroengine impellers, etc. The on-machine inspection technology can provide real-time feedback on the dimensional accuracy inspection results of parts and avoid secondary clamping and positioning errors, which is the key to accurate and efficient inspection of parts processing quality. However, such complex curved surface parts have complex structures and changeable curvatures, making detection difficult. [0003] Although there are a lot of research on measuring point planning methods for complex surfaces, these traditional on-machine measuring point planning methods ar...

AI Technical Summary

Problems solved by technology

However, this kind of complex curved surface parts has complex structure, variable curvature, and difficult detection

[0003] Although there are a lot of research on measuring point planning methods for complex surfaces, these traditional on-machine measuring point planning methods are mostly for the surface as a whole. Due to the large curvature changes of complex surfaces, it is easy to ignore the extreme point information, resulting in curvature The problem of low fitting accuracy in large areas of change

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