Transient Ship-Engine-Propeller Matching Characteristics Based on Detailed Modeling of Shaft System in Simulink
To study the ship-engine-propeller matching characteristics under transient conditions and the influence of elastic coupling parameters(stiffness and damping coefficients)on the load shock response,the external characteristics of the ship's main engine,shaft,propeller,resistance,and elastic coupling are comprehensively considered,and the discrete dynamic model for the dynamic matching of the ship-engine-propeller system is refined.On this basis,a simulation model is built using Simulink.A specific four-engine,twin-propeller research vessel is used as the research object for detailed modeling.The model provides a rapid engineering prediction of the matching results under load shock conditions from both the main engine and the propeller ends.Through parameter analysis,the impact of coupling parameters on the load shock response is compared.Finally,the theoretical and simulation models are validated by combining actual navigation data from the simulation vessel.The results show that the elasticity of the coupling joint has a significant impact on the dynamic characteristics of the shock response,and appropriate damping coefficients can reduce the system shock.However,excessively high damping coefficients result in a fully rigid response.These results have been further verified and supported by real ship tests.In practical engineering applications,adjusting the stiffness and damping of the coupling joint appropriately improves the system's shock response.Considering the coupling joint in the ship-engine-propeller matching model provides guidance for optimizing the design and selection of marine power systems and expanding the application of ship-engine-propeller matching.
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