Abstract
The present article investigates the dynamic behavior of a fully assembled
turbogenerator system influenced by misalignment. In the past, most of the
researchers have neglected the foundation flexibility in the
turbogenerator systems in their study, to overcome this modelling error a
more realistic model of a turbogenerator system has been attempted by
considering flexible shafts, flexible coupling, flexible bearings and
flexible foundation. Equations of motion for fully assembled
turbogenerator system including flexible foundations have been derived by
using finite element method. The methodology developed based on least
squares technique requires forced response information to quantify the
bearing–coupling–foundation dynamic parameters of the system associated
with different faults along with residual unbalances. The proposed
methodology is tested for the various level of measurement noise and
modelling error in the system parameters, i.e., 5% deviation in E (modulus
of elasticity) and ρ (density), respectively, for robustness of the
algorithm. In a practical sense, the condition analyzed in the present
article relates to the identification of misalignment and other dynamic
parameters viz. bearing and residual unbalance in a rotor integrated with
flexible foundation.
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