Abstract
The propulsion system, as the crucial equipment to drive the ships, its stability is of great significance for the safe and reliable operation of the system. This study focuses on the propulsion system for large-scale ships with high- and low- integrated double-cylinder turbines, and carries out theoretical and experimental research on its dynamic characteristics and system stability. Firstly, based on comprehensively considering the key excitations and multi-state meshing of the system, a nonlinear dynamic model of the gear-rotor-bearing system including two power paths is established. Secondly, the influences of the load ratio between the unsymmetrical input power on the dynamic characteristics and motion stability are studied by global and local analysis methods. Finally, by establishing a comprehensive experimental platform for the parallel propulsion system, the in-depth experimental research on the vibration state, acoustic characteristics, and power loss of the system is carried out. The research results show that the increase of the load ratio has a positive effect on enhancing the system stability, reducing the vibration and noise, and improving the power efficiency. This research has the guiding significance for the power design and optimization of the marine propulsion system powered by double-cylinder turbines.
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