Dynamic analysis of a cracked Jeffcott rotor has been carried out, considering the effects of fluid film bearings. Q factors and dissipation coefficients have been evaluated in addition to the harmonic responses of the rotor. The coast down phenomenon was analysed for the effects of crack depth. Sensitivity studies were carried out, considering dissipation, response and the Q factor. Measurement of Q factors of second harmonics, Qx1 and Qy2, has been suggested for crack detection, while measurement of Q factors of first harmonics is recommended for crack monitoring as these proved to be more sensitive to cracks compared with other methods.
RajalinghamC.GanesanN.PrabhuB. S.The dissipation coefficient and its application to flexible rotor-bearing system design. Wear, 1986, 107(2), 343–354.
10.
RajalinghamC.Some studies on non-Newtonian and thermal influence on steady state and dynamic performance of journal bearings. PhD thesis, Indian Institute of Technology, Madras, India, 1987.
11.
SekharA. S.PrabhuB. S.Condition monitoring of cracked rotors—a comparative study of fluid film bearing supports. Mach. Vibr., 1995, 3, 225–232.
