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0 INTRODUCTIONIngeneral,thecomponentsofarotor bearingsys tem ,suchasshafts ,disks ,andbearingsarenotaxis symmetrical.Becauseofthenon axis symmetry ,shaftanddiskhavedifferentstiffnessandmomentofinertiaintwoprincipaldirections .However ,itisdifficulttostudythesy… 相似文献