Research On Optical Measurement Of Aging Airplane Wings Deformation

The aircraft's wings play the key role in flying. However, the aircraft is extremely fatigue after the long years' flying and countless take-off and landing.In recent 10 years of the 21 st century, the frequency of the occurrence of aging aircraft crash is higher, resulting in very serious economic losses. And many accidents are caused by improper maintenance of aging aircraft. Nowadays, the detection methods for aging aircraft are mainly Non-Destructive Testing(NDT), which is used in the key components of the civil aircraft, not be applied to the whole body detection. Most NDT of civil aircraft are in service inspection. It is difficult to approach and the conditions of wings surface are complex for the implementation of the work, So the efficiency is poor.A lot of inconveniences are consided for the use of NDT, a efficient method is proposed to detect the deformation degree on the wing of aging aircraft. Because of the wing's wide span, the ordinary three-dimensional measurement is not easy to carry out in the room. A non-contact measurement of large space photogrammetry program is designed. In the work field, some key considerations are put forward to improve the accuracy of photogrammetric. Pose estimation algorithm is used to solve the initial orientation, and the relative orientation is received based on coplanarity constraint. The cumulative error is reduced by the series-parallel imaging. Finally, the three dimensional coordinates are obtained by Bundle adjustment. With the advantages of fast measurement and easy operation, the whole body of the aircraft is achieved to detect. At last, part of key points are measured by laser tracking three-dimensional coordinates to verify the feasibility of this method.