ACTA AERONAUTICAET ASTRONAUTICA SINICA >
Thermal deformation error modeling and compensation approach for laser tracker orientation
Received date: 2014-08-16
Revised date: 2014-09-07
Online published: 2015-10-13
Supported by
National Natural Science Foundation of China (51375442)
It is crucial to improve the laser tracker orientation accuracy, which determines the measurement accuracy and assembly quality in the process of aircraft digital assembly. The change of temperature often leads to ERS (Enhanced Reference System) points' deviation from the theoretical position, which is the main cause for the reduction of orientation accuracy. A panel fixture is studied as an example and the deformation of ERS points turns out to change linearly through the calculation of finite element model (FEM). Then a method for computing the thermal deformation coefficient matrix in per degree is proposed to compensate the theoretical coordinate. According to the deformation rule, another method to get the matrix coefficient is proposed using statistical analysis of experimental data. We check the relevance and equivalence of coefficient matrix getting from FEM and experiment with regression analysis, which validate the correctness of coefficient matrix from FEM. Finally, linear relationship of thermal deformation and effectiveness of compensation are demonstrated by examples.
YANG Baoliu , YU Cijun , JIN Zhangjun , LI Jiangxiong , LI Mingfei . Thermal deformation error modeling and compensation approach for laser tracker orientation[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2015 , 36(9) : 3155 -3164 . DOI: 10.7527/S1000-6893.2014.0217
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