A Method of Enhancing the Accuracy of Coordinate Measurement Field Using Spatial Multi-length Constraint

Abstract

The invention discloses a method for increasing coordinate measurement field accuracy through space multi-length constraint. The method for increasing the coordinate measurement field accuracy through the space multi-length constraint comprises steps of (1) constructing a plurality of length standards in site, installing laser tracker target ball seats at two ends of the plurality of rigid rods to be served as measuring points and calibrating the distance between the measuring points at two ends of the rigid rods through a laser tracker; (2)distributing a plurality of laser tracker target ball seats to be served as global measuring points, arranging a plurality of rigid rods in the standard length and enabling the laser tracker target ball seats at two ends of the rigid rods to be served as global measuring points; (3) arranging the laser tracker under m stations and measuring three-dimensional coordinates of all the global measuring points; (4) achieving azimuthal orientation through the three-dimensional coordinates of the global measuring points under the m stations and calculating to obtain an iteration initial value; (5) establishing a laser tracker length measurement, horizontal angle and vertical angle constraint equation and establishing a length standard based constraint equation and optimizing the three-dimensional coordinates of the global measuring points. The method for increasing the coordinate measurement field accuracy through the space multi-length constraint is low in construction cost and high in efficiency and effectively increases the coordinate measurement field accuracy.

Description

technical field [0001] The invention belongs to the technical field of large-scale three-dimensional coordinate measurement on industrial sites, and in particular relates to a method for enhancing the accuracy of a coordinate measurement field by using space multi-length constraints. Background technique [0002] The precision measurement problem in the process of large-scale equipment manufacturing and assembly has become a common and urgent problem in the fields of aerospace, shipbuilding and other large-scale equipment manufacturing. The complex technical problems faced by this type of measurement problem are: first, the measurement space is huge, usually ranging from tens of meters to tens of meters; second, the measurement accuracy is high, and it is necessary to achieve sub-millimeter high-precision measurement, and it is quite difficult to balance the two at the same time . Therefore, in order to solve such measurement problems and realize global measurement and prec...

AI Technical Summary

Problems solved by technology

This method utilizes high-precision laser interferometric distance measurement. In the harsh industrial measurement environment, multiple spatial length references (μm level accuracy) are constructed on site through the tracker target ball seat and carbon fiber or Invar rod. The length references can be flexibly arranged. In the required space area, the construction cost is low, and the problem of difficulty in carrying and maintaining the physical scale is solved

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