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DINAME2019
DINAME2019
Rotor Balancing Using Parametric Excitation
Submission Author:
Ricardo Ugliara Mendes , SP
Co-Authors:
Ricardo Ugliara Mendes, Fadi Dohnal
Presenter: Ricardo Ugliara Mendes
doi://10.26678/ABCM.DINAME2019.DIN2019-0166
Abstract
The traditional balancing procedure consists of adding test masses and accelerating the rotor up to the critical speeds correspondent to the modes to be balanced. Recently, a novel method has been developed where the rotor is accelerated at the first critical speed only. The responses of higher modes are obtained by introducing a parametric excitation at the combination resonance frequencies of the rotor through the active magnetic bearings; resulting in an energy transfer from the first critical speed to the higher modes. This method reduces the balancing procedure time and the risk of high levels of vibration when the unbalance is critical and the rotor crosses higher critical speeds. However, the parametric excitation should be tuned very carefully to maximize the energy transfer to higher modes. Among the parameters to be tuned, the phase difference between the parametric excitation applied in the bearings is particularly important, once it can drastically influence the energy transfer. Therefore, this survey focuses on the influence of the phase difference between the bearings parametric excitation in the energy transferred from the lower critical speed to higher modes. The model of a flexible rotor sustained by active magnetic bearings is used in numerical simulations to evaluate the influence of the aforementioned parameter in the energy transfer to the second and third modes of the rotor.
Keywords
Influence Coefficient Balancing, parametric excitation, Parametric Combination Resonance, Sensitivity analysis
