7Q. Han, M. Wang, H.Chu. Nonsynchronous Vibrationsof Rotor System with an Oil-Block inside the RotatingDrum [J] . Advances in Vibration Engineering, 2013,12 (2): 165-178.
8Wolf J A . Whirl Dynamics of a Rotor Partially FilledWith Liquid [J] . Journal of Applied Mechanics,1968,35 (4): 676-682.
9Hendricks S L. Stability of a Clamped-Free Rotor Partial-ly Filled With Liquid [J] . Journal of Applied Mechan-ics, 1986, 53 (1): 166-172.
10Holm christensen 0, Trager K. A Note on Rotor Instabili-ty Caused By Liquid Motions [J] . Journal of AppliedMechanics, 1991, 58 (3): 804-811.