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Global measurement data registration method based on multi-vector constraint

A measurement data and global technology, which is applied in the field of global measurement data registration based on multi-vector constraints, can solve the problems of data registration accuracy decline, achieve the goal of improving data registration accuracy, ensuring overall measurement accuracy, and broad engineering application prospects Effect

Active Publication Date: 2020-03-27
DALIAN UNIV OF TECH
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Problems solved by technology

[0004] The present invention aims at the defects of the prior art, and in order to avoid the engineering problem that the accuracy of data registration is seriously reduced due to the measurement error of local common points, a global measurement data registration method based on multi-vector constraints is invented to reduce the registration of global data error to ensure the overall measurement accuracy of the geometric features of large aerospace parts in a large space

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  • Global measurement data registration method based on multi-vector constraint
  • Global measurement data registration method based on multi-vector constraint
  • Global measurement data registration method based on multi-vector constraint

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Embodiment Construction

[0044] The specific embodiments of the present invention will be described in detail below in conjunction with the technical solutions and accompanying drawings.

[0045] In this embodiment, four laser trackers of the AT960 type produced by Leica Company are selected, the measurement range is 60m, and the measurement uncertainty is ±15μm+6μm / m; four 1.5-inch target balls are selected as the common points to be measured. In the experiment, the position relationship of the four target balls arranged satisfies P 1 with P 2 The spacing is about 5m, P 3 and P 1 ,P 2 The spacing is about 4.7m, P 4 with P 1 ,P 2 The spacing is about 4.4m, and P 3 The spacing is about 3.6m. In this experiment, four laser trackers measured four common points of four target balls at four stations respectively, that is, m=n=4, and the measurement field size was about 7×6m.

[0046] The present invention first rationally arranges four non-coplanar target balls to the public point P of No. 1, No. ...

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Abstract

The invention discloses a global measurement data registration method based on multi-vector constraint, belongs to the field of large-size measurement, and relates to a global measurement data registration method based on multi-vector constraint. According to the method, a plurality of non-coplanar target balls are reasonably arranged in a certain space to serve as common points, a common point data set is obtained through multi-station measurement of a laser tracker, and the station with the minimum overall measurement error serves as a global coordinate system. Normal vectors are then solvedbased on the common points and unitized. And finally, a conversion parameter of the local coordinate system is solved based on the constraint of the normal vector of the redundant unit, and the localdata is registered to the global coordinate system. According to the method, the problem that the data registration precision in a large-size space is abnormally sensitive to common point measurementerrors and the number of common points is fully considered; registration errors of global measurement data can be effectively reduced, the method can be quickly applied to field practice to guaranteethe overall measurement accuracy of geometrical characteristics of large aviation parts, and the method has wide application prospects in the field of large-size measurement.

Description

technical field [0001] The invention belongs to the field of large-scale measurement and relates to a global measurement data registration method based on multi-vector constraints. Background technique [0002] The digital measurement of large aviation parts has become one of the key core technologies in the field of aviation assembly. The laser tracker has the characteristics of large measurement range and high single-point measurement accuracy, and is widely used in the high-precision measurement of large aerospace parts. However, due to the complex structure of the measured part and the occlusion of the line of sight, the single-site measurement of the laser tracker is difficult to meet the requirements of full-scale integrity measurement and high-precision measurement of large components. Multi-site collaborative measurement provides an excellent solution for the integrity measurement of large-scale components. In order to obtain the integrity measurement data of large...

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Application Information

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IPC IPC(8): G01B11/00
CPCG01B11/002
Inventor 刘巍李俊卿逯永康张洋马建伟司立坤
Owner DALIAN UNIV OF TECH
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