Research On Assembly Process Planning Technology Of Airfoil Frame Based On Digital Twin

The assembly frame is a commonly used assembly process equipment for the assembly of aircraft wings,fuselage and other components.It has much higher assembly accuracy requirements than the aircraft components assembled on it.The frame assembly is usually completed with the help of various digital measurement equipment.The assembly process planning of process equipment needs to fully consider the installation accuracy requirements and structural characteristics of its various positioning components.In this paper,the wing assembly frame of a general aircraft is taken as the research object.In order to meet the needs of accurate installation of assembly process equipment,the digital twin assembly process model is constructed by applying the relevant technical concepts of digital twin technology.The visual assembly process instructions are used to guide the actual assembly process,and the information interaction and feedback are realized by establishing the association between digital space and physical space.The application of digital twin technology in the frame assembly process is that the assembly process is planned and simulated by analyzing the relationship between the frame and the assembled aircraft components,fusing frame model and the application of digital measurement equipment in the process of frame installation and considering related elements such as personnel,tools,standards,and inspection requirements associated with the frame assembly process.In the digital space,a digital twin assembly process model is formed,which takes the visual assembly process file as the expression form and is consistent with the actual assembly process(physical space).According to the relevant assembly instruction files of the frame formulated in the digital space,the assembly process is implemented in the physical space,and the assembly process information and problems in the assembly process are fed back through the information interaction interface connecting the physical space and the digital space,so as to improve and improve the frame assembly process.The information interaction interface between digital space and physical space is constructed to receive the frame process instruction,execute the assembly process and fed back all kinds of assembly process information.According to the assembly process planning and implementation of the overall technical scheme based on digital twin,the assembly structure levels of parts are divided and the assembly process sequence is determined by studying and analyzing the installation accuracy requirements and assembly structure characteristics of various positioning components of the frame.Based on the process planning and simulation software DELMIA of Dassault company,the assembly process design and assembly process simulation are carried out,and the visual three-dimensional assembly process file including detailed process content is generated,which is used to guide the actual assembly process of physical field.The relevant information of the physical assembly site and the implementation of the assembly process instructions are confirmed according to the visual assembly process documents to complete the assembly of the frame.By analyzing the composition of interactive information between physical space and digital space,the information flow model is constructed and the information interaction platform is designed and developed by using VB.NET to realize the transmission and feedback of assembly information.