Method for detecting space position state of each circular member bar of jacket in three-dimensional coordinate system

Abstract

The invention discloses a method for detecting the space position state of each circular member bar of a jacket in a three-dimensional coordinate system. The method comprises the following steps of: 1, arranging the jacket and a member bar to be detected in the same three-dimensional coordinate system and projecting the three-dimensional coordinates of a surface point of an acquisition member bar onto the circumference of a cross section formed by measuring points; 2, performing primary angular rotation and secondary angular rotation on a point to be detected; 3, processing converted coordinate data by adopting a minimum square method under the condition that the theoretical radius of the member bar to be tested is given and calculating an error in point measurement between an optimum circle center coordinate and a circle center coordinate of the member bar to be detected; 4, picking a point with a larger error out and repeating the step 3; 5, performing reverse three-dimensional conversion to an original coordinate system; and 6, connecting the optimum circular center coordinates of the member bar to be detected, obtained by calculating, into a linear jacket structural figure, evaluating the error of each member bar of the jacket and adjusting the member bar. By adopting the method, the three-dimensional coordinate of the circle center of each circular member bar of the jacket can be obtained quickly and accurately, the error value of the circle center coordinate is analyzed, and the working efficiency is improved.

Description

technical field [0001] The invention relates to a method for determining the three-dimensional coordinates of the center of a cylinder, in particular to a method for detecting the spatial position of each circular rod of a jacket under a three-dimensional coordinate system. Background technique [0002] In the marine engineering manufacturing industry, the construction and assembly of the jacket is relatively complicated, and most of its structure is composed of rolled steel pipes. The assembly accuracy of such circular rods as steel pipes is very high. How to quickly, accurately and efficiently determine the circular The space position coordinates of the rod center are very important in the jacket construction process. [0003] In the three-dimensional coordinate system, for the spatial rods for construction and installation, since the rods are rolled, there are roundness errors to varying degrees. There are two traditional detection methods for the spatial position of rods...

AI Technical Summary

Problems solved by technology

Therefore, the workload of on-site fixed-point measurement is relatively large. In the case of complex construction site conditions, it is impossible for the total station to capture these points at the same time. It can only observe some points of a small arc on the circumference. The ellipticity and the uncertainty caused by the inability to measure the points on the entire circumference of the rod under the field conditions, according to the traditional least square method, the calculated coordinates of the center of the circle are not very accurate

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