Multi-Objective Simulation Optimization Of Automatic Container Terminal Plane Layout

Automatic container terminal have significant advantages in saving operating costs and increasing container throughput.The digitization and automation of production process is an inevitable trend in the future development of domestic container terminal.However,the construction of automatic container terminal construction projects need high cost,long-term construction,and the project implementation is irreversible.The selection of container terminal plane layout not only has important impact on the implementation of terminal construction,but also has significant impact on the production capacity,service quality and economic benefits after terminal putting into production.Based on multi-objective decision theory and WITNESS simulation software,this paper studies the optimization of automatic container terminal plane layout.The main contents are as follows:(1)Analysis on complexity of automatic terminal in production process system and theoretical analysis of its plane layout optimization.Based on the analysis of typical process system pattern and plane layout features of automatic container terminal,its loading and unloading production process is studied.Then,the complexity and plane layout diversity of the automatic container terminal are analyzed.The optimization theory of automatic terminal plane layout is proposed,and the research method of plane layout optimization combined the subjective and objective weight determining methods is desided.(2)Research on the framework of automatic terminal comprehensive evaluation system and the weight determining method of evaluation indicators.Based on the complexity of production,the diversity of plane layout structure and numerous evaluation objectives of automatic container terminal,a multi-level comprehensive evaluation system framework is established.The evaluation indicators suitable for the plane layout of automatic container terminal are determined by qualitative analysis,quantitative analysis and hybrid analysis.And,the combined weight determining method based on the analytic hierarchy process and the entropy weight method are carried out.(3)Evaluation of automatic terminal plane layout based on multi-objective decision.Firstly,the standardization method of evaluation indicators in multi-objective decision making is analyzed,and the theoretical model of comprehensive evaluation of automatic terminal plane layout is established.Based on the hierarchical-entropy weight method and comprehensive evaluation model,the composite weights of the five terminal plane layout schemes are calculated.Furthermore,the sensitivity analysis of attribute value,attribute weight,and combined weight determining method of decision on the terminal plane layout is analyzed.The stable interval that ensuring the optimal solution unchanged are obtained by using MATLAB software.(4)Simulation of automatic container terminal is builded by using WITNESS.The connection between the WITNESS simulation elements and the plane layout of automatic terminal is established.Taking the plane layout of Yangshan phase IV project as study object,the simulation model's process is designed in detail.The key parts of the simulation model include ship planning,shore loading and unloading system,horizontal transportation system,yard loading and unloading system,collection and distribution system.(5)Research on multi-objective simulation optimization of automatic container terminal plane layout.The visual interface of automatic container terminal simulation is designed.Then,the operating parameters that are satisfied and suitable for the automatic terminal model are obtained.Those parameters can provide evaluation index attribute values for the comprehensive evaluation theory model.Finally,research on multi-objective simulation optimization for automatic container terminal are conducted.