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Multiple fault parameter estimation of a fully assembled turbogenerator system

Lal M.

Archive of Mechanical Engineering

2018

Vol. LXV, nr 2

233--252

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, ﬂexiblecoupling, 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.