Research On The Key Workstations And Digital Twin-Driven Assembly System For Electronic Accelerator Pedal Automatic Production Line

In this paper,TBQ-72 A electronic accelerator pedal is taken as the research object,according to the construction requirements of automation,informatization and intellectualization of the production line,the digital twin technology is applied in the production assembly process,and the digital twin-driven assembly system is researched and developed.The assembly system mainly includes three modules: a automatic production line based on perceptual features,a data resource center based on mapping features,and a control platform based on digital twin model.The main research contents of this paper are as follows:(1)Firstly,according to the construction requirements of the production line,combined with the analysis of the research and application of digital twin technology,the overall framework of the digital twin-driven assembly system is proposed.Secondly,the framework is divided into a automatic production line,a data resource center and a control platform,and the overall design of each part is carried out.Finally,the key technologies involved in the development of the system are studied,including sensor network-based data acquisition technology,PROFINET-based data real-time mapping technology and digital twin modeling technology.(2)Combining with the assembly process of the key workstations of the automatic production line,the actuators of the key workstations were designed in detail for the structural characteristics of the electronic accelerator pedal and the difficulties in the assembly process.Based on the perceptual demand analysis of assembly process information,a distributed sensor network composed of sensor nodes and intelligent nodes is designed.The motion control system of the key workstations is designed from two aspects of hardware and control scheme.(3)According to the real-time requirements of the assembly system for data,the data resource center is divided into a real-time data mapping module and a non-real-time data management module.The real-time performance of the data mapping process based on PROFINET is analyzed from three aspects: communication protocol model,communication frame structure and communication frame forwarding mode.On this basis,a real-time mapping channel between the production line and the control platform is established,and the real-time mapping mechanism of the assembly motion data is emphatically studied.(4)Based on the functional requirements of the digital twin model for the control platform,a three-dimensional digital twin model is proposed,which describes the geometry,behavior,and regularity characteristics of the production line.Than,the modeling principle and flow of geometric model based on OIA,behavior model based on engine network and rule model based on RBF neural network are studied in detail,and through the integration of digital twin model,the production line and the data resource center,real-time visual monitoring and simulation optimization of assembly process is realized.On this basis,the development process of each functional module of the control platform is designed.(5)Firstly,from the three aspects of actuators,sensor network and motion control system,the realization of the key workstations of the automatic production line is introduced.Finally,by configuring the development and operation environment of the data resource center and the control platform,and the functional modules of the control platform are verified according to the functional test method.