Simultaneous-estimation-of-the-residual-unbalance-and-bearing-dynamic-parameters-from-the-experimental-data-in-a-rotor-bearing-system_2009_Mechanism-and-Machine-Theory.pdf

Mechanism and Machine Theory 44 (2009) 792–812
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Mechanism and Machine Theory
journal homepage: ate/mechmt
Simultaneous estimation of the residual unbalance and bearing
dynamic parameters from the experimental data in a rotor-bearing system
R. Tiwari *, V. Chakravarthy
Department of Mechanical Engineering, Indian Institute of Technology Guwahati, Guwahati 781 039, Assam, India
article info abstract
Article history: Two separate identification algorithms, for the simultaneous estimation of the residual
Received 27 December 2006 unbalance and bearing dynamic parameters in a rigid rotor-bearing system, have been
Received in revised form 12 January 2008 described and demonstrated both by numerical simulations and experimental measure-
Accepted 19 April 2008
ments. The first method uses the impulse response measurements of the journal from
Available online 10 June 2008
bearing housings in the horizontal and vertical directions, for two independent impulses
on the rotor in these directions. Time-domain signals of impulse forces and displacement
responses are transformed to the frequency domain, and are used for the estimation of
Keywords:
the residual unbalance and bearing dynamic parameters. The second method employs
Bearing dynamic parameters
Residual unbalance the unbalance responses from three different unbalance configurations for the estimation
Identification of these parameters. Unbalance response measurements are taken for both the clockwise
Impact and counter-clockwise rotations of the rotor. To test the developed identification algo-
Run-down rithms, numerical simulations have been performed and algorithms are found to be
excellent even in the noising measurement environment. Then experimental measure-
ment responses have been fed to identify the residual unbalance and bearing dynamic
parameters by both the methods. To check the suitability of the identified parameters,
they are substitute