Dynamic behaviour analysis of coupled rotor active magnetic bearing system in the supercritical frequency range

In this article, an attempt has been made to model and estimate speed-dependent characteristic parameters of coupling misalignment and AMB, in an AMB integrated coupled flexible rotor system running in the supercritical frequency range. For estimation algorithm, desired current and displacement responses in time series are acquired from Simulink. The practical limitation of FEM modelling is the number of sensors and availability of measurement locations that have been overcome by applying a novel gyroscopic high-frequency condensation (GHFC) scheme. The transformation matrix obtained from standard high-frequency condensation (SHFC) is modified by adding a gyroscopic effect into the transformation matrix to achieve the novel GHFC. The numerical analysis has been performed on a coupled rotor train system along with AMB. The estimations are presented and compared for SHFC and GHFC. The GHFC is found effective over SHFC techniques. The effect of noisy response and modelling error on the estimation algorithm is analysed and found competent. The experimental responses obtained for a different level of misalignment conditions have been compared with the numerically simulated response and found that the application of AMB suppresses the excessive vibration. (C) 2020 Elsevier Ltd. All rights reserved.