Analysis And Optimization Of Air-railway Intermodal Transport Process Based On Petri Net

With the continuous expansion of China’s civil aviation industry and the continuous improvement of the high-speed rail network,aviation and high-speed rail are playing an increasingly important role in China’s transportation system and have become an important part of the construction of China’s comprehensive three-dimensional transportation network.Air transport way and the high-speed rail transport modes have their advantages and characteristics of the air transport and rail transport advantages of integrated cohesion and collaboration of empty tin transportation mode will greatly excavate potential,makes the transport of goods on the basis of safe and reliable to further improve the efficiency of transportation,have greater flexibility,and for the development of transportation industry in China provides a strong protection.In order to carry out the analysis and research on the operation process of air/rail combined freight transport,through the analysis of a large number of literature and the in-depth analysis of the operation process of air/rail combined freight transport into port and the operation process of departure from port,the model of the operation process of air/rail combined freight transport into port and the operation process of departure from port are established by using the modeling method of Petri net.And the established Petri net model was optimized,and Flexsim simulation software was used to simulate and analyze the established Petri net model before and after optimization,so as to achieve the purpose of optimizing the transportation process and reducing the process cycle.Firstly,the paper introduces the research background of air-railway combined transport and the current situation of development at home and abroad in detail.Then introduces the air-railway combined transport and the related theory of Petri net;Then,the operation process of cargo air rail combined transport into port and departure port were analyzed,and the Petri net modeling was carried out for the process.The model performance was analyzed and verified.Then,using Petri net structure analysis method and accessibility matrix calculation method,the optimization and performance analysis of Petri net model are carried out for the operation process of air-rail combined transportation in port and out of port respectively.Then,Flexsim simulation software was used to build the simulation entities before and after the optimization of the operation process of cargo air-rail combined transport into port and the operation process of departure port,and the simulation operation was carried out to analyze the results before and after the optimization.Finally,through the simulation results,it can be concluded that the optimized air-railway combined transport process significantly reduces the process cycle,and makes the integration of air-railway combined transport process more reasonable,can significantly improve the transport efficiency,and has a certain guiding significance for the construction and development of China’s air-railway combined transport.