Research On Several Key Technologies Of Digital Twin System For Aircraft Final Assembly Line

Under the background that many countries in the world are striving to publish the advanced manufacturing strategy in order to realize intelligent manufacturing,the integration of the information world and the physical world in the manufacturing process has become one of the main bottlenecks of intelligent manufacturing.The essence of digital twin is to realize the equivalent mapping of information space to the physical world,which provides a way to break through the bottleneck mentioned above.Taking the final assembly line of a certain type of aircraft as an example,this paper studies several key technology of building the digital twin system of the final assembly line of aircraft,and designs and implements the system.Firstly,the architecture of digital twin system for aircraft final assembly line based on CPS lattice model and Moore finite state machine is designed.The event-driven CPS system modeling method and the finite state machine(FSM)mathematical model are introduced.Based on the assembly status of an aircraft final assembly line,the CPS lattice model modeling method and Moore finite state machine are improved.Using the improved CPS lattice model and Moore finite state machine,the overall architecture of the digital twin system of the aircraft final assembly line is designed based on the five-tier architecture of CPS.An application example of the framework is given,and it is pointed out that the implementation of the example can be divided into two parts:the data acquisition platform of the aircraft assembly site and the visualization platform of the aircraft final assembly line.Then,the field data acquisition platform for aircraft final assembly line is designed and implemented.According to the current situation that the industrial network and the campus network are not interconnected in final assembly line of a certain type of aircraft,the concept of neutral zone is proposed to realize the integration of the industrial network and the campus network.The table structure of the neutral zone database and the table structure of each device are designed.The design and implementation of the field data acquisition platform for aircraft final assembly line are discussed from four aspects:equipment network topology,data acquisition business process,development of acquisition interface and use of acquisition interface.Then,the data are synchronized from the DNC server for assembly in the neutral zone to the statistical analysis server for assembly in the campus network.Finally,the visualization platform for aircraft final assembly line is designed and implemented.This paper expounds the overall structure of the platform from four aspects of its architecture,functional structure,technological process and platform framework.Based on the overall structure of the platform and application technology foundation,the visualization platform of the aircraft final assembly line is realized,and the platform is tested and displayed,which provides a reference case for enterprises to build the digital twin system of the aircraft final assembly line.