Design And Realization Of Marine Air Conditioning Simulation System

In recent years,researches on the simulation system of ship are concentrated on the engine room simulator,bridge simulator and cargohandling simulator.The engine room simulator mainly simulates the performance of the main propulsion,engine room, ship power station and so on.Even if part contents are about marine air conditioning simulation in engine room simulator,but the simulation models and operating functions are simple without pertinency.Marine air conditioning is one of the most important equipment in the vessel.Therefore,it is essential to carry research on the modular modeling and simulation of the marine air conditioning system.The simulation object in this paper is the air conditioning system of Dalian maritime university training ship "YU KUN".At first,this article introduces the composition and characteristics of marine air conditioning system,according to its characteristics of working process and the requirements of operation,then analyzes the PLC automatic control functions of the marine air conditioning system.Secondly, using the method of modular modeling,the author establishes the dynamic mathematic model of marine air conditioning system,through the analysis of mechanism,with laws of mass conservation,energy conversation,momentum conservation and theories of thermodynamics,heat-transfer,fluid dynamics etc.On the basis of established dynamic mathematic model,this article establishes the simulation model with the tool of Matlab/Simulink and introduces the method and process of building real-time simulation model for each sub-module in detail.Through setting reasonable simulation parameters and algorithm,the author carries the real-time simulation experiment on the computer,the result is coincident with known data,thus verifying the correctness of the model.On the basis of the accurate mathematical model,the author get the simulation display through programming language Visual C#.Firstly,utilize the Object-Oriented technique to categorize the marine air conditioning system into many subobjects to achieve certain functions,then compile every object to a class via the programming language Visual C#.These classes are not visual from the outside,and they exchange data and function through outer interface.Next,in the environment of Microsoft Visual C#.Net,with the help of many kinds of graph making tools,form a lot of simulation interfaces which can ensure some functions about simulation operating and displaying. Finally the author accomplishes the simulation software by connecting simulation interfaces effectively with those computing classes.