The effect of tangential load torque on the dynamics of rotors has been studied analytically using both cantilevered and between-bearing rotor models. External damping, distributed shaft mass, and gyroscopic moments are taken into account. A number of analytical approaches, including the classical method and a modified transfer matrix method have been utilized and they all gave results with excellent agreement. For realistic levels of torque, the major effect is found to be on the whirl stability of the system. Stability is found to depend most strongly on the dimensionless ratio of torque to damping, and on the mode shape.
The dynamic stability of overhung flexible rotors subjected to load torques has been studied analytically. Other factors, such as external damping, distributed shaft mass, and gyroscopic moments, are considered. For the analyses, the transfer matrix is developed to include the effect of the applied torque and then integrated into a computer program to investigate the stability of overhung rotor systems under both tangential and axial load torques. Two overhung rotor systems are considered: the cantilevered rotor and the overhung rotor with an intermediate support. The ratio of the load torque to the damping for the stability is presented for the various locations of the intermediate supports. It was found that stability depends strongly on both the mode shape and the dimensionless torque to damping ratio.
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