Research On Simulation And Optimization Of Automated Assembly Line Of High-speed Train Bogie

With the continuous improvement of Chinese comprehensive strength,Chinese high-speed trains have successfully ranked among the world’s high-speed train powers,and the demand of high-speed trains will further increase.The bogie as the core part of the high-speed train,the production efficiency of the bogie plays a decisive role in the production efficiency of the high-speed train.However,the production and logistics process of bogie assembly line is great complex.Most of the design and optimization of traditional bogie assembly line relies on manual experience and lacks of theoretical and technical support,which seriously affects the production efficiency of the bogie assembly line.However,discrete production system modeling and simulation technology provides an important way to solve the above problems.This paper takes bogie automatic assembly line as the research object,establishes the simulation model.The existing problems of the assembly line are obtained by analyzing the simulation results.The assembly line is optimized from assembly line balance and logistics system resources allocation.The main contents of this paper are as follows:(1)This paper studies the function and structure of bogie,analyzes the present situation of bogie automatic assembly line,and briefly explains the main problems in the actual production process.At last,the evaluation indexes of the bogie automatic assembly line are established.(2)The methods of the discrete production system simulation establishment are studied.The hierarchical Petri net is adopted to establish the model of bogie automated assembly line.Establishing a mapping rule to implement the conversion from Petri net physical model to the Flexsim simulation model,the model of bogie automated assembly line is established,and the simulation model is redeveloped.Finally,the simulation results of the assembly line are analyzed to confirm the bottleneck problems.(3)On the basis of simulation and analysis,the balance problem of bogie automatic assembly line is transformed into the second balance problem of bilateral assembly line.By studying the division of work units,weighted work time and constraints,a heuristic algorithm was established to solve the balance problem of bogie automated assembly line.Finally,the balance rate and smoothness index are used as evaluation criterion to evaluate the result of balance optimization.(4)On the basis of balance optimization of bogie automated assembly line,the method of experimental design is adopted to optimize the allocation of logistics system resources of the assembly line,and the experimental results are analyzed to determine the optimal allocation of logistics system resources.The results before and after optimization are compared to determine the effectiveness of the optimization program.Based on the discrete production system modeling and simulation technology,the production process and logistics process of bogie automatic assembly line are simulated dynamically and analyzed,to enhance the rationality of system bottleneck identification and optimization program implementation,to achieve the purpose of allocating resources properly and improving assembly line productivity.It provides guiding significance for optimization of bogie automatic assembly line.