Simulation and Accuracy Guarantee Technology of Fuselage Component Trial Assembly Based on Dynamic Process Model

Abstract

Abstract Modern aircraft fuselage size is large, structural rigidity is weak, the docking process is complex, accuracy guarantee is difficult and assembly efficiency is low. Especially in the plug-in butt joint assembly process of large fuselage parts, there is the inherent problem of invisible and unmeasurable docking end surfaces. It is more likely to lead to interference or uneven gaps in the docking process, and eventually lead to repeated trial assembly and decline in the consistency of the connection quality. That will affect the assembly efficiency and fatigue characteristics of the local structure. Aiming at the plug-in butt joint assembly of large fuselage parts, this paper integrates digital measurement technology, numerical control positioning technology and virtual simulation technology, through measurement modeling and trial assembly simulation to guide the digital positioning and docking process. It makes the invisible and unmeasurable process of insertion digitally visible. Through the integration of point cloud data acquisition and pre-processing, digital twin modeling and assembly simulation, a dynamic process model for trial assembly simulation is constructed. A complete test environment for the joint assembly of the fuselage barrel parts was built. Research was conducted on the reduced test pieces of MA700 front fuselage and middle fuselage. We developed a large space measurement module, a spatial attitude solution module, an integrated control module and a virtual simulation module. The effectiveness of the fuselage component trial assembly simulation based on dynamic process model and accuracy assurance technology was verified.