基于孔边距约束和Shepard插值的孔位修正方法

doi:10.7527/S1000-6893.2015.0047

Abstract

Abstract:

The position accuracy of holes directly affects the quality of aircraft final assembly. Automatic drilling relies on aircraft CAD model, which is influenced by the assembly errors. In closed structure such as aircraft wing, it is hard to ensure the distance between the hole center and the boundary of trench of skeleton. Then, a correction method for hole positions based on hole margin constraints and Shepard interpolation is proposed. Firstly, laser tracker and T-Scan are used to collect point cloud data of wing skeleton and then the data is processed through de-noising and registration. Then, actual hole positions are calculated by projecting reference holes on skeleton model to point cloud. And local boundary feature points are extracted, which are used to fit a Ferguson curve as the local boundary of key feature. Finally, the deviations of actual and theoretical constraint hole margin are calculated. For the deviation exceeding the preset tolerance, the positions of constraint holes are firstly corrected based on hole margin deviation and the other holes are corrected by Shepard interpolation. To demonstrate the validity of this method, an aircraft wing is measured and the data is processed to correct hole positions, which shows that the hole positions can be corrected and the distribution characteristics of original holes can be reserved.

Key words: hole positions, boundary, hole margin deviation, Shepard interpolation, correction tactics

CLC Number:

V262.4

WANG Qing, ZHENG Shouguo, LI Jiangxiong, KE Yinglin, CHEN Lei. A correction method for hole positions based on hole margin constraints and Shepard interpolation[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2015, 36(12): 4025-4034.

References

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A correction method for hole positions based on hole margin constraints and Shepard interpolation

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