| With the continuous development of ship industry, the simulation of electric propulsion has become the an important development direction of ship electric propulsion for irs many advantages. So far, the most simulation software can only be used independently and can not achieve interoperability and reuse,so each developing of simulation software will take a lot of effort and time, and it is not conducive to the maintain.The ship electric propulsion system has increasingly become a object in the world. The High Level Architecture (High Level Architecture,HLA) is a new generation of distributed interactive simulation (DIS) Architecture, It provides a general technical framework for distributed simulation system.Its remarkable characteristic is to provide available and relatively independent service program to all kinds of simulation applications,so when runing a a large joint simulation in the network,it can separate the communication of the simulation application, the simulation function and simulation process controlling and hidden their respective details, thus developer can develop relatively independently and to achieve maximum utilization for the latest technology in their respective fields. The fundamental purpose of HLA is to improve the interoperability of different types of simulation application and reusability of simulation resources.The paper applied HLA to the simulation of the ship electric propulsion system, distributed simulation task to different computer nodes of the network. and realized the distributed simulation of ship electric propulsion system based on HLA.This paper on the basis of summarizing the mathematical model and basic principles of ship electric propulsion system, through simplifying model, combining with the application of simulation software Simulink to building the ship electric propulsion system simulation mode and then dividing the ship electric propulsion system into three federal members,they are the prime mover and speed control system simulation model,generators excitation systems and propulsion motor simulation model,propeller simulation model. By discussing the advantages and the disadvantages of several kinds of the methods that transforming Simulink model into the of HLA federation number, decided to use the model code generation tool RTW with MATLAB to transform Simulink model into C++code, after the comparison of time running framework, anasyled and modified the code of Simulink models and making it conforming to the HLA rulers. The model code modifications can be divided into two aspects: one is the modification run-time frame for original model, the realization method is to construct a simulation management class SimulinkManager class, remove the function main (),split its content into model initialization function (MdlStart ()),the model step propulsion function (MdlOutput (), MdlUpdate (), MdlDerivatives () loop),the model termination function (MdlTerminate ()) three parts,and encapsulate the three functions into several member function of class SimulinkManager. On the other hand is the modification of communication part for original model code the implementation method is to construct a simulation model class. Through these two aspects of modifications, Simulink models can be transformed into federates based on HLA. Ultimately, realize the distributed interactive simulation of ship electric propulsion system.Finally, debugging developed federation numbers on the platform of Prti1516,Simulating the output power of the prime mover,the speed of the generator,the speed of the propulsion electric machine and the resistance torque of the propeller.Through the analysis of the experimental result,certified the feasibility of the applying the HLA technology to the simulation of the ship electric propulsion system. |
