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Communication Dans Un Congrès Année : 2010

Unbalance Identification in Nonlinear Rotors

Résumé

Classical balancing techniques for rotating machinery consider that these systems are linear. However, if some nonlinearity appears in the structure, these techniques do not work properly and the results obtained regarding the correction weights and their corresponding angular positions are not satisfactory. This behavior is due to the fact that these techniques, such as the influence coefficients method, consider linear relations involving the unbalance excitations and the resulting vibration. Consequently, nonlinear behavior is not taken into account in the formulation of classical balancing techniques. In this paper, the system studied is composed of a horizontal flexible shaft with two rigid discs. The shaft is supported by bearings located at its ends, as follows: a roller bearing at one end and two ball bearings at the other end. The roller bearing is located in a squirrel cage attached to the framework by three identical flexible steel beams. The Electro-Magnetic Actuator (EMA) located on the external cage constitutes a smart active bearing and provides nonlinearity in the dynamics of the system. The methodology proposed for the unbalance identification of nonlinear rotors was realized through pseudorandom optimization methods and the system modeling was performed by using the well-known finite element method. Several computer simulations were performed for different rotor configurations both for the cases with and without the EMA effects. The methodology was then validated through an experimental test rig that corresponds to the model described above. The results obtained demonstrate the effectiveness of the method developed.
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Dates et versions

hal-00941446 , version 1 (03-02-2014)

Identifiants

  • HAL Id : hal-00941446 , version 1

Citer

T. Souza Mourais, Valder Steffen Jr, Jarir Mahfoud, Johan Der Hagopian. Unbalance Identification in Nonlinear Rotors. 8th IFToMM International Conference on Rotordynamics, Sep 2010, South Korea. pp.1-8. ⟨hal-00941446⟩
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