研究目的
To improve the accuracy of measurements in aircraft assembly by proposing a thermal deformation compensation method based on precise thermal deformation theory.
研究成果
The proposed novel compensation method performed significantly better than the Horn method, with the average registration error decreased by 9.2–38.7%, and the maximum registration error decreased by 12.3–38.6%.
研究不足
The study focuses on the thermal deformation compensation in large-volume metrology systems, particularly in aircraft assembly, and may not be directly applicable to other fields without adaptation.
1：Experimental Design and Method Selection:
The study employs a thermal deformation compensation method based on precise thermal deformation theory.
2：Sample Selection and Data Sources:
A total of 38 ERS points were distributed in the workshop, of which 10 were used for relocating the laser tracker.
3：List of Experimental Equipment and Materials:
A LEICA AT901-LR laser tracker was used for the measurements.
4：Experimental Procedures and Operational Workflow:
The thermal deformation coefficients of ERS points in X-, Y-, and Z-axes were estimated separately with the approximation of the transformation parameters. An iterative method was then used to determine the compensation of actual locations of the ERS points and calculate the optimal values of the transformation parameters.
5：Data Analysis Methods:
The registration accuracies of the Horn method and the proposed method were compared using two evaluation indices, the maximum registration error Max(E) and the average registration error Ave(E).
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