Research On The Influence Of Ship Maneuvering Under Different Navigation Conditions On The Performance Of Propulsion System

Intelligent ship industry of China is in a booming stage,and related technologies from the design and development of supporting products to operational services are rapidly advancing,and the pursuit of intelligent systems has become a new trend.As an important component of the ship’s power system,the propulsion system is closely related to energy transfer and ship movement.However,the composition of the system is complex.Not only should we focus on the individual performance of each component,but also consider the propulsion system as a whole and pay attention to its cooperating performance.Regarding the overall performance of the system,not only the propulsion system dynamics,but also more maneuverability,economy and safety must be considered.According to the functional principle of the bulk carrier and related design specifications,the modeling structure and modeling requirements of the propulsion system are summarized.Based on the MATLAB / Simulink software,a three-degree-of-freedom motion propulsion system simulation platform was established: a basic propulsion system module including an empirical model for diesel engines,a propeller torque model,a ship’s forward resistance model,and a rudder model was established.A three-degree-of-freedom MMG maneuvering model capable of realizing multi-mode simulation functions,a control system model including a main engine speed control and a rudder heading control,and an environmental interference model are also established.The completed simulation platform for the overall performance of the propulsion system can be applied to the performance research of the bulk carrier propulsion system.Based on the actual sailing status of the ship,this paper analyzes the different navigation conditions of a general bulk carrier,and combines it to summarize the different operating conditions that the ship may operate.Then,based on the established performance simulation platform,the design conditions and variable conditions of the ship were simulated.The effects of changes in resistance characteristics and handling conditions on the propulsion system’s coordination performance are discussed,and the steady-state and dynamic operating characteristics of the propulsion system are summarized.The analyzed performance parameter influencing factors and changing trends can provide reference opinions for improving the performance of the propulsion system and optimizing control.Finally,a navigation optimization method based on fuel consumption prediction under different maneuvering conditions is proposed.The research work in this paper provides a reference for future research on system integration.The simulation model established can be used as a tool to comprehensively evaluate design results and operating parameter changes,and provide a simulation platform for the study of system performance.