Js. Rao et al., THEORETICAL-ANALYSIS OF LATERAL RESPONSE DUE TO TORSIONAL EXCITATION OF GEARED ROTORS, Mechanism and machine theory, 33(6), 1998, pp. 761-783
This paper is concerned with lateral response of geared rotors due to
torsional excitation. Usually torsional response is determined due to
excitation torque, such as short circuit torque, to determine the safe
ty of a turbo generator set and the coupling of bending and torsion in
such an analysis is ignored. Such an analysis gives an accurate predi
ction only when the bending natural frequencies are not close to the s
pin speed and its higher as well as lower orders. In this work, the co
upling between bending and torsion due to gears as well as the effect
of axial torque on bending vibrations is taken into account to determi
ne the coupled lateral and torsional response due to torsional excitat
ion. Examples are given which illustrate the importance of such coupli
ng mechanism giving rise to large amplitudes of bending vibrations whi
ch may be harmful to the operation of geared turbine rotors. The effec
t of axial torque is shown to be less significant, even when the rotor
runs at the bending natural frequency and is subjected to a short cir
cuit torque. (C) 1998 Elsevier Science Ltd. All rights reserved.