ANALYSIS OF ROTORS CONSIDERING DISTRIBUTED BEARING STIFFNESS AND DAMPING

Usually, while modelling rotor-bearing systems the bearings are treate d as point supports. In the present work using the finite element tech nique, the eigenvalue and stability analysis of rotors are studied by considering the distributed bearing stiffness and damping. Two models are considered: (i) uniform distribution model and (ii) parabolic dist ribution model. The results are compared with that of a rotor on point supports. Stability limits of a rotor supported on different types of bearings, viz. cylindrical journal bearings, tilting pad journal bear ings, offset and three lobe journal bearings have been presented. Copy right (C) 1996 Elsevier Science Ltd.