A simplified model of the hydro-generator shaft system with dual rotors that simplifies the degrees of freedom

This study is based on the established simplified model of the hydro-generator shaft system with two rotors, which takes into account the electromagnetic, mechanical and flow excitation. At the same time, to ensure that the simulation results have engineering usability, this paper adopts the "shape guidance" strategy based on the test signal library of the axis trajectory, starting from the geometric shape of typical measured trajectories, to reveal the correlation between various trajectories and the dominant frequency components as well as the corresponding excitation sources, and to construct several identifiable physical driving components.