In the following investigation the modeling of a shaft machine system is discussed for the hybrid propulsion of a Ship. The system consists of an Internal Combustion Engine (ICE), a Doubly Fed Induction Machine (DFIM) serving as motor (whereas capable of working in four quadrants), and a planetary gear box which connects the ICE and the DFIM to the propeller for hybrid propulsion. The full dynamic model of the planetary gear box is taken into account, comprising both rotational and translational modes for the gears. The dynamic model of the planetary gear box is being solved by employing dimensionless parameters in order to mitigate the problem related to the difference of the magnitude between stiffness and damping coefficients. The total approach and the mathematical models adopted in this study, particularly for the mechanical system aspires to the development of a well established basis for studying the interactions between the electrical and mechanical subsystems. In the future the dynamics of roller elements and thrust bearings will also be included.
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