Research On System Separation And Integration Mechanism And Simulation Modeling Method Of Dry Bulk Terminal

The rapid development of the economy has brought about an increasing demand for dry bulk cargo.At the same time,due to the uneven distribution of resources such as coal and ore,the current cross-regional transportation situation of bulk dry bulk materials and other materials has been formed.The dry bulk terminal is an important node in the dry bulk water transportation network,and it plays an irreplaceable role.The dry bulk terminal is a logistics system that covers multiple operations such as the seaside,the yard and the landside.The system presents complex features such as multiple inputs,multiple outputs,dynamics,and nonlinearity.It is becoming more and more difficult to solve these complex problems by relying on traditional methods for some practical problems in the whole life cycle of the design,construction and operation of dry bulk terminals.In this paper,the system simulation method is introduced into the logistics system of dry bulk terminal,and the separation and integration mechanism of dry bulk terminal system and its modular modeling method and application are discussed.The main contents include two aspects: First,standing at the level of complex system modeling ideology,a modular simulation modeling method based on system separation and integration mechanism is proposed.The simulation sub-module library and modeling framework library for dry bulk terminal are built,which provide the basis for the realization of modular modeling method.Secondly,from the point of view of engineering application,In view of the limitations of traditional methods in solving terminal engineering problems,combined with the proposed modeling method based on system separation and integration mechanism,the modified HLA modeling method,the block-integration modeling method and the MAS modeling method are applied to these engineering problems to provide quantitative solutions.Overall,the main research contents and innovations of this paper are as follows:(1)Based on the analysis of coupling relationship and the separation and integration mechanism of terminal system,a modular simulation modeling method based on separation and integration mechanism is proposed,and a sub-module library and a modeling framework library are developed.Based on the hierarchical model construction process of DEVS,the combination process of coupled models in DEVS is transferred to the simulation model establishment process of dry bulk cargo terminal,and a modular simulation modeling method based on system separation and integration mechanism is proposed.Its core is based on standardized sub-modules to form simulation models in a specific way of module combination.Modeling framework library and sub-module library are the two foundations of the modeling method based on the separation and integration mechanism of the system.In order to promote the application of this modeling method,a sub-module library and a modeling framework library are developed.(2)An analysis method of bulk cargo terminal throughput based on modified HLA modeling is proposed.In the current terminal design process,the calculation of throughput often uses the empirical formula.It directly takes the throughput of the sea side as the comprehensive throughput of a terminal.In fact,a terminal’s throughput is affected by the seaside,the yard and the landside of the terminal.Combining the results of the system integration mechanism of dry bulk terminal,the modified HLA modeling method is applied to the modeling process of bulk cargo terminal.And the paper establishes a simulation model that considers all the production links of a dry bulk terminal.Based on the relevant processes and rules,the terminal’s throughput is analyzed by simulating the operation process of the terminal.(3)A production efficiency evaluation method of bulk cargo terminal based on block-integrated modeling method is proposed.The production efficiency of a termianl is affected by many complex factors.At present,the evaluation of production efficiency is mostly based on static evaluation and ex post evaluation of expert experience.In this paper,a method of efficiency evaluation based on block-integrated modeling is proposed.By establishing the simulation model of the whole operation process of export dry bulk terminal,the dynamic relationship between production efficiency indicator and input factors is studied,and the pre-evaluation and dynamic evaluation of production efficiency are realized.(4)A MAS-based quantitative comparison method for the water-water transshipment coal terminals is proposed.Previous terminal design selection mainly relies on the experience of engineers for qualitative and static comparison.This paper presents a quantitative analysis method based on MAS modeling method.This method is based on the modeling method of system separation and integration mechanism.The most important feature of this MAS model is that it covers many functional entity agents and many management decision-making agents in the model system.Based on this comprehensive MAS simulation model,the quantitative comparison and selection of different design schemes are realized.In summary,this paper puts forward a modeling method based on the system separation and integration mechanism by analyzing the separation and integration mechanism of the loading and unloading process system of dry bulk cargo terminal.This method is a basic method,which provides the sub-modules and framework needed for modeling.The modeling method based on the system separation and integration mechanism can be combined with the modified HLA modeling,the block-integration modeling,the MAS modeling method,which can be used as the basis of these modeling methods to develop simulation models.