Research Of Coordinated Operation Optimization Between Ship And Waiting-yard In Passenger-cargo Ro-Ro Port

As an important branch of our Nation’s water transportation industry,passengercargo RoRo(Roll-on/roll-off)transportation combines the characteristics of traditional RoRo transportation and ferries transportation,with high transportation efficiency and low loading and unloading costs.It exists widely in Qiongzhou Strait,Bohai Bay,Beibu Gulf and other places,providing a certain guarantee for the regional economic and social development and the development of tourism in our Nation’s coastal areas,Yangtze area,rivers and other places.In recent years,with the continuous improvement of the national economy,the passenger-cargo RoRo business has shown a blowout development.As the core link of the passenger-cargo RoRo port,the passenger-cargo RoRo ship stowage operation has a significant impact on the resource allocation and efficiency benefits of the entire port.Existing studies have focused on traditional RoRo ship stowage,but there is very little research on RoRo passenger ship stowage.Passenger-cargo RoRo ship stowage has a series of complex characteristics,resulting in the current stowage operation relying heavily on manual experience,and there are the following problems: Uncertainty of manual experience leads to unstable operation process;manual experience stowage cannot effectively utilize the buffering function of the waiting yard;stowage operations and waiting yard operations cannot form a good coordination and linkage.The above is likely to lead to a lot of vehicle moving operations in the waiting yard,which seriously restricts the improvement of port production efficiency and income.For this reason,this thesis studies the coordinated operation of ships and the waiting yard in the passenger-cargo RoRo port.Based on the actual port production operation,considering the two decision-making units of the waiting yard operation and the stowage of the passenger-cargo RoRo ship,refining characteristics of the problem,and two-dimensional packing,introducing classic theories such as two-dimensional bin packing,online decision-making,and multiobjective optimization through mathematical modeling and intelligent algorithm optimization,formulate scientific and reasonable coordinated operation planning.The main research results are as follows:(1)The characteristics of coordination operation problems is refined and complexity analysis is conducted.Based on the current situation and production process of typical passenger-cargo RoRo port business,the factors that restrict the development of current passenger-cargo RoRo business is explored;The occurrence scene and impact of the car moving operation are analyzed,and the four characteristics of the RoRo passenger ship stowage,including two-dimensional packing,two-stage stowage,complex rotation,and safe navigation,are extracted.Finally,the objectives,constraints and real-time dynamic characteristics of coordination operations are described in detail,and the problem is summarized as a multi-stage multi-objective dynamic decision-making problem.(2)The coordinated operation between ships and the waiting yard is optimized in the passenger-cargo RoRo port.Based on the real-time dynamic characteristics of coordinated operation problems,considering both daily and busy operation scenarios,the rolling scheduling theory is introduced,and a rolling optimization strategy based on the vehicle queue in the waiting yard is designed,and the state transfer between the front and rear stages is realized by discretizing the cabin area,for building a multi-stage multi-objective coordinated optimization model.The multi-stage dynamic decisionmaking algorithm(MDDA-SH)based on segmentation heuristic is designed to solve the problem.The core of the algorithm is the hybrid swarm intelligence algorithm based on gray entropy parallel analysis(HSIA-GEPA)to complete the window multiobjective decision optimization.Finally,the artificial stowage heuristic and HSIAGEPA are embedded in MDDA-SH for comparative analysis to verify the validity of the model and MDDA-SH as well as the superiority of HSIA-GEPA.(3)Intelligent system for coordinated operation between passenger-cargo RoRo port ships and waiting yards is designed.In order to improve the level of "three modernizations" of the port,based on the core theory and decision algorithm,combined with the actual production operation process of the port,a visual intelligent operation system is designed.At the same time,using computer technology,Java,HTML and other programming languages as well as tools,such as MySQL and Maven,to develop an intelligent operating system management platform with complete functions,convenient and comfortable experience,providing a certain reference for the traditional passenger-cargo RoRo port to move towards a smart port.