Mark point coordinate measuring method and system and deformation measuring method and system

Abstract

The invention discloses a mark point coordinate measuring method and system and a deformation measuring method and system. The mark point coordinate measurement method comprises the following steps: photogrammetric measurement of a body in white is carried out, and a positioning point file containing position information of all target points is obtained in a measurement coordinate system; in the measurement coordinate system, the surface of the feature area is aligned through laser scanning, and scanning point cloud is obtained; calculating a transformation matrix for aligning the scanning point cloud with the design state digital-analog point cloud of the alignment feature region; and converting the position information of the mark points in the positioning point file by using the transformation matrix, and solving the coordinates of each mark point in the design coordinate system. In the measurement coordinate system, position information of each target point is obtained through photogrammetry, point cloud data of the aligned feature area is obtained through laser scanning, then the point cloud data is aligned to a design state digital model, a transformation matrix for transformation from the body-in-white measurement coordinate system to the design coordinate system is obtained, and the position of each target point is transformed to obtain a design state digital model; and the coordinate value of the body-in-white mark point can be accurately obtained.

Description

technical field [0001] The invention relates to the technical field of vehicle crash tests, in particular to a method and system for measuring coordinates of a marked point, and a method and system for measuring deformation. Background technique [0002] In the process of passive safety development in automobile R&D and design, it is necessary to carry out the crash test and simulation analysis of the prototype vehicle. In the process of measuring the deformation of the crash test vehicle and benchmarking against the simulation results, it is necessary to use a three-dimensional coordinate measuring machine or a three-dimensional scanner to measure the deformation area of ​​the body-in-white in three dimensions. In the actual application process, the widely used articulated arm three-coordinate measuring machine has high measurement accuracy, but it may not be able to complete the measurement of the deformation area of ​​the whole vehicle at one time. Leapfrog jumping is req...

AI Technical Summary

Problems solved by technology

In the actual application process, the widely used articulated arm three-coordinate measuring machine has high measurement accuracy, but it may not be able to complete the measurement of the deformation area of ​​the vehicle at one time. Leapfrog jumping is required, the operation is more complicated, and it may cause certain accuracy loss

The 3D laser scanner is more convenient and quick to use, and can obtain the triangular mesh surface or point cloud data of the deformation area of ​​the body-in-white. However, in the actual application process of the 3D laser scanner, the measurement output is the triangular mesh surface or point cloud data, namely The acquired data is the surface position information of a continuous area, and the coordinate information of specific marking points on the surface of the body-in-white cannot be accurately picked up

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