| The combined of diesel and gas turbine device(CODAG device)uses the diesel as the main engine for propulsion in the cruise state,which has low fuel consumption rate and good economy.In the high-speed navigation state,the diesel and the gas turbine are used to propel the ship together,so the ship has fast navigation speed and good maneuverability.The CODAG device is one of the development directions of China's large and medium-sized ship power in the future.During ship navigation,ship-engine-propeller matching characteristics have an important impact on ship performance.Based on the results of ship-engine-propeller optimization matching,the control strategy of dynamic process such as parallel and splitting can be established and studied,which can provide support for the research and design of the device.Domestic research on CODAG device is relatively few,it has important engineering application value to carry out research on it.In this paper,the integrated simulation method is applied to do the simulation fo the ship-engine-propeller characteristic matching and dynamic process of ships powered by CODAG device.The details are as follows:(1)Mathematical models of various components under ship-engine propeller matching process of CODAG device were established.According to the physical structure and motion equation of each component,the mathematical models of diesel,gas turbine,control system,SSS clutch,double speed gearbox(containing friction clutch),transmission gear box,propeller,rudder and hull were established which can provide the foundation for the establishment of simulation models.(2)The integrated simulation method of CODAG device was studied.The realization method and process of integrated simulation were studied.Based on the mathematical model,the simulation models of each component were established.The simulation models of the prime mover,the control system and the load were built in the environment of Matlab/Simulink,and the simulation models of the transmission components were built in the environment of Adams,and the modular model base was founded.The interfaces between Simulink and Adams,Simulink and Virtual.Lab,Simulink and SimulationX were studied.The platform interface was developed with Matlab/Gui and the integrated simulation platform of CODAG device was formed,which can provide support for the simulation works.(3)The ship-engine-propeller optimization matching characteristics of CODAG device were studied.Based on the model base of the simulation platform,an integrated simulation model of a four-engine two-propeller CODAG device was established.The propulsion process of the CODAG device was divided into different stages according to the power level,and the ship-engine-propeller matching performance were studied.Aiming at economy,the matching process was optimized,and the matching characteristics and the optimal economic operation curves of each gear were obtained,which can provide support for the operation of ships under different stages.(4)The dynamic characteristics of the CODAG device were studied by the method of integrated simulation,including the acceleration process,the parallel process and the splitting process under the propulsion of the diesel engine and the co-propulsion of the diesel engine and the gas turbine.The changes of speed and power of the engines and torque transfer of the clutches in transmission system were obtained in each process,which can provide support for the formulation of dynamic process control strategies.(5)The rotation process of CODAG device based on ship-engine-propeller matching was studied.The characteristics of each stage of the rotation process were studied,and the simulation of the rotation process under the propulsion of diesel engine and the co-propulsion of the diesel engine and the gas turbine was carried out by changing rudder angle,rudder angle and pitch ratio,rudder angle and propeller speed respectively.The variation process of ship speed,propeller thrust and torque was obtained. |
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