Tracker transfer parameter optimization method and device for three-dimensional thermal expansion deformation of workpiece

Abstract

The invention discloses a tracker transfer parameter optimization method and device for three-dimensional thermal expansion deformation of a workpiece, and the method comprises the steps: calculatingthe central point of the thermal expansion deformation of the workpiece through ANSYS finite element thermal analysis according to a three-dimensional digital model of a to-be-measured workpiece; establishing a transfer station target optimization function considering the three-dimensional thermal expansion deformation of the workpiece; according to the theoretical value of the reference point ofthe workpiece enhancement system and the position result, actually measured by the laser tracker, of the reference point of the workpiece enhancement system, adopting a singular value decomposition method to obtain initial values of transfer parameters; randomly generating a plurality of transfer parameters according to the initial values of the transfer parameters to establish a particle swarm ofan optimization algorithm, and calculating adaptive values of individuals of the particle swarm; and carrying out iterative optimization on population individuals by adopting a particle swarm optimization algorithm until an optimal tracker transfer parameter is obtained through calculation. According to the method, the three-dimensional thermal deformation factor of the workpiece caused by temperature change of the large workpiece is fully considered, and the station transfer measurement precision of the tracker is improved.

Description

technical field [0001] The invention relates to the technical field of digital measurement, in particular to a method and device for optimizing parameters of a tracker transfer station for three-dimensional thermal expansion and deformation of workpieces. Background technique [0002] In the assembly process of large-scale product workpieces, the entire measurement system includes the tracker measurement coordinate system, tooling coordinate system and product workpiece coordinate system, etc. It is often necessary to use the laser tracker to perform station transfer, so as to obtain the station parameters (including rotation matrix and translation matrix) of the measurement coordinate system and the measured coordinate system. Due to the large number of materials assembled, the complex structure, and the influence of tooling constraints and deformation, the coefficients of thermal expansion and deformation of the product in the three directions of x, y, and z will be differ...

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Problems solved by technology

This calculation method does not consider the three-dimensional thermal deformation of the product workpiece at different scales

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