Virtual Simulation Debugging And Optimization Of Automobile Connecting Rod Production Line Based On Digital Twin

With the advent of the ’ Industry 4.0 ’ era,the industry ’s upgrading from traditional processing to intelligent manufacturing is the key to the success of industrial transformation.Under the influence of the concept of intelligent manufacturing,digital twin technology has received great attention from the beginning.Because it focuses on the virtual digital model and the real physical model to pursue synchronous motion and ultimately achieve mutual control.This meets the requirements of intelligent manufacturing to apply intelligent technology to manufacturing,and also fits the future direction of national manufacturing development.How to use CNC machine tools and industrial robots to achieve the fastest production of intelligent manufacturing production lines and how to reasonably and efficiently carry out pre-production line planning and design has become a difficult problem in front of intelligent equipment system integration enterprises.The coordinated development of digital twin and many industrial software provides a new feasible way to solve such problems.Therefore,this paper proposes a solution for virtual simulation debugging and optimization of automobile connecting rod production line based on digital twins.Firstly,The processing technology of automobile connecting rod and the virtual model of digital twin are analyzed.The structural characteristics,main technical requirements,processing process,main processing surface and processing sequence of the connecting rod are analyzed.The digital twin of intelligent manufacturing production line requires multi-dimensional modeling of the production line.According to the design requirements of the automobile connecting rod production line,the design and construction are carried out in the NX CAD module,and the sketches of each part are drawn respectively.After stretching,rotating and other operations,the geometric three-dimensional model of each part is completed,and then the corresponding constraints are completed.Finally,the digital model of connecting rod parts and automatic production line is constructed.Secondly,According to the five-dimensional model and hierarchical structure of digital twin,the digital twin structure system of automobile connecting rod production line including physical layer,digital layer,twin model layer and application service layer is designed.Not only the interaction between the various levels is discussed,but also the overall design of digital twin is carried out according to the system requirements and structural characteristics of the digital twin structure of the automobile connecting rod production line,including the structural design and collaborative design of the digital twin of the automobile connecting rod production line.Thirdly,the simulation and debugging of the digital twin of the automobile connecting rod intelligent manufacturing production line are completed in NX MCD.Use the virtual model to simulate and debug the physical model to achieve further analysis and optimization.For the virtual model of the digital twin of the intelligent manufacturing production line,the NX MCD platform can fully realize the parallel design and collaborative design of its mechanical,electrical,control and other disciplines.Based on the NX MCD platform,the motion scene of the connecting rod production line is realized.The TIA Portal software is used to complete the hardware configuration system and PLC program design.The S7-PLCSIM-Advanced software enables the electromechanical model in the NX MCD to interact with the PLC signal in the TIA Portal,thus completing the construction of the communication bridge between the NX MCD platform and the TIA Portal.Finally,the conceptual design,simulation and debugging of the mechatronics of the automobile connecting rod production line based on digital twin are realized.Finally,the automobile connecting rod production line model is applied to verify the feasibility of the production plan.Through the description of the risk value of the automobile connecting rod production plan,the optimal solution of the production plan is derived.This paper proposes a risk assessment and optimization of the production plan of the parallel assembly line workshop by using BP neural network and genetic algorithm.The random factors are added to the mathematical model,and the production time fluctuation caused by accidental power failure and equipment failure in the workshop is expressed by disturbance,so as to obtain the application of the risk assessment model corresponding to the connecting rod production plan in the uncertain system.The BP neural network is trained by a large amount of data to obtain the risk assessment corresponding to the connecting rod production plan,and the basic operators are roulette selection,simulated binary crossover and polynomial mutation.The genetic algorithm solves the optimal production plan to realize the risk assessment and optimization of the automobile connecting rod production plan.Finally,the automobile connecting rod production line model is used to pre-drill the optimal production plan.