Research On Digital Flexible Docking Assembly Technology Of Aircraft Wing

The assembly and docking of large aircraft components is an important part of the aircraft assembly process.The assembly quality and efficiency determine the flight performance,manufacturing cost and production cycle of the aircraft.At present,the docking of large aircraft components in China is still dominated by traditional docking assembly methods.Digital flexible docking assembly technology is still in its infancy,and there are still many key technologies that need to be overcome.In the face of the development needs of modernization,it is an inevitable way to explore the digital flexible docking assembly technology of aircraft and realize the digitization,automation and flexibility of aircraft assembly.In this paper,the related technology of flexible docking assembly of aircraft large parts is taken as the research object,including the construction of wing height accuracy measurement field,the measurement method and visualization of laser tracker,the principle of component docking and the method of error processing,and the experiment of aircraft wing-body docking assembly is carried out.The main contents of this paper are as follows :(1)A high-precision measurement field is constructed.According to the characteristics of aircraft wing-fuselage components docking,the relationship between the global coordinate system and the local coordinate system in the measurement field is established,and the BursaWolf coordinate transformation model is optimized.The measurement field error model is analyzed by Monte Carlo simulation method.A pose calculation model is established for the docking of fork-ear parts to improve the accuracy of local docking method.(2)A new surface matching calculation model of distance weighted error determined by docking datum position is proposed.The weight of the fit error is assigned by the position relationship between the different pose control points and the datum plane,and the theoretical coordinates of the control points are preprocessed to realize the high-precision positioning of the curved surface.(3)A wing-body simulation docking platform was built and verified by experiments.Aiming at the proposed surface pose matching optimization method,multiple sets of point selection experiments are carried out with a laser tracker.By comparing the target position errors before and after the optimization method,the correctness of the pose calculation model is verified,and the error of the wing-fuselage docking assembly is effectively reduced.