Detection method for three-dimensional space section roundness of large component

Abstract

The invention relates to a detection method for three-dimensional space section roundness of a large component. Non-contact laser measurement is carried out by utilizing a total station instrument, meanwhile measured data is transmitted to a computer for analysis and processing in real time, measurement points are projected to a projection plane calculated by a least square method or an eigenvalue method, and measurement points which are not in conformity with the conditions are eliminated to obtain the best projection evaluation plane, and an evaluation center and the best radius are calculated to obtain a roundness evaluation value of each section measurement point. Data acquisition is high in degree of automation, and acquisition and analysis are in seamless connection; measurement and analysis processes are strong in visualization by utilizing computer aid, and data and graphs are displayed in a correlated manner, so that operators can conveniently and accurately grasp the measurement and analysis processes. The detection method can be used for real-time measurement and detection for any section roundness of the large component, measurement results can be obtained in real time, and according to the measured data, the measurement points also can be increased or decreased at any time or a certain measurement point can be measured again, so that the difficulty in judging the section roundness of the large component is greatly simplified, and the working efficiency is improved.

Description

technical field [0001] The invention relates to steel structure processing or industrial measurement, in particular to a method for detecting the roundness of a three-dimensional space section of a large component. Background technique [0002] Large-scale components with regular shapes such as cylinders, cones, elliptical cylinders, and spheres can be seen everywhere in the production and construction, especially steel components, such as oil storage tanks, submarine pressure hulls, etc. The cross-section of these components is usually circular. Theoretically, under the action of uniform load, the structural section will not generate bending moment. However, if the initial deflection of the section deviates from the theoretical circle, additional bending stress will be generated due to the bending moment, which will change the stress state of the structure and break the original moment balance state. The greater the initial deflection, the greater the bending stress will be...

AI Technical Summary

Problems solved by technology

[0003] At present, the radial initial deflection of domestic components is generally measured by the strut method, which is cumbersome to operate, the measurement accuracy is not high, and the degree of automation is low, which seriously reduces the reliability of the existing method in terms of structural strength.

In the practice statistics of large-scale steel member construction, it is found that there are about 1.3-1.7% sloppy points in the measurement method of struts, that is, human errors, such as irregular use of measurement tools, inaccurate readings and records, data processing errors, etc. In addition, there are measurement Influenced by objective factors such as low precision of the instrument itself

At the same time, the reliability analysis of the strut measurement method has not been carried out in China so far.

If the structural strength of the component is required to be improved, the maximum value of the radial initial deflection must be reduced, but the existing measurement method of the strut cannot meet the measurement accuracy requirements, so it is urgent to find a method with higher measurement accuracy and more automation to solve this problem

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