“…Zhou et al established a coupling dynamic model of the planetary gear and rotor with a composite fault of shaft eccentricity and tooth root cracks, and verified through experiments that the effect of the eccentricity fault on meshing vibration is significant [6] . He et al analyzed the impact of eccentricity faults on the meshing stiffness of planetary gear trains and found that eccentricity causes periodic changes in the meshing stiffness [7] . Iglesias et al proposed a planetary transmission analysis model and analyzed the influence of eccentricity error on system load distribution [8] .…”