Effect of Rotor-Stator Contact on the Mass Unbalance Response

Duran, Celio; Manin, Lionel; Andrianoely, Marie Ange; Bordegaray, Céline; Battle, Frédéric; Dufour, Régis

doi:10.1007/978-3-319-06590-8_163

Cited by 8 publications

(11 citation statements)

References 9 publications

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“…For low cost, repeatability, and operability reasons, this is commonly achieved by means of numerical simulation. The literature comprises a lot of numerical investigations for various nonlinear properties, such as rotor-stator contact [1] [2], crack breathing [3] [4], hydrodynamic bearings [5] [6], on-board rotor mounted on hydrodynamic bearings [7], etc.…”

Section: Introductionmentioning

confidence: 99%

Numerical Tracking of Limit Points for Direct Parametric Analysis in Nonlinear Rotordynamics

Xie

Baguet

Prabel

et al. 2016

Journal of Vibration and Acoustics

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International audienceA frequency-domain approach for direct parametric analysis of limit points of nonlinear dynamical systems is presented in this paper. Instead of computing responses curves for several values of a given system parameter, the direct tracking of limit points is performed. The whole numerical procedure is based on the Harmonic Balance Method and can be decomposed in three distinct steps. Firstly, a response curve is calculated by HBM combined with a continuation technique until a limit point is detected. Then this starting limit point is used to initialize the direct tracking of limit points which is based on the combination of a so-called extended system and a continuation technique. With only one computation, a complete branch of limit points is obtained, which provides the stability boundary with respect to system parameters such as nonlinearity or excitation level. Several numerical examples demonstrate the capabilities and the performance of the proposed method

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Section: Introductionmentioning

confidence: 99%

Numerical Tracking of Limit Points for Direct Parametric Analysis in Nonlinear Rotordynamics

Xie

Baguet

Prabel

et al. 2016

Journal of Vibration and Acoustics

Self Cite

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“…Instead of the classical contact law modeling two discontinuous states (contact or no contact) and leading to numerical problems, a contact law based on parameters λ k and λ c to regularize the stiffness and damping functions is chosen, see [32,33]…”

Section: Well-drillstring Contactsmentioning

confidence: 99%

“…The friction direction depends on the sign of the friction function µ(v g ). A regularized form of µ(v g ) based on the dynamic and static friction coefficients µ d , µ s and on the regularized parameter v r is considered [32,33]…”

Section: Well-drillstring Contactsmentioning

confidence: 99%

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Campbell Diagram Computation for a Drillstring Immersed in Curved Wells

Nguyen

Tran

Andrianoely

et al. 2019

Journal of Vibration and Acoustics

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The drilling operations use a rotary slender structure introduced inside the drill well. The nonlinear dynamics with bit-bouncing, stick-slip phenomena, and pulsating mud flow may yield the premature wear and damage of drilling equipment and should be investigated to improve the reliability of drilling operations. This work presents the beam element formulation to model the drilling nonlinear dynamics. The well-pipe contacts are modeled by the radial elastic stops. The fluid–structure interactions are considered. The first step consists in computing the static position of structure to determine the contact points and calculate the preloaded state. These results are then considered to calculate the Campbell diagram. The potentially unstable speeds of rotation are identified. The results show that the modal coupling phenomena strongly occur for the three-dimensional well. The well-pipe contacts modify the modes in rotation, and the rotating fluid induces a strong deviation of the flexural mode curves.

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“…The normal contact forces fcrir is modelled with a vibro-impact model based on Hunt and Crossley [10] derived from the Hertz theory for inelastic collisions. The inner-race rotor interface friction force is described by a Coulomb model smoothed with the arctangent law, also used in [11]. The TDB angular dynamics is taken into account by an equivalent polar inertia, a resistive torque and the TDB is driven in rotation by the Coulomb interface friction force.…”

Section: Rotor -Tdb Systemmentioning

confidence: 99%

Non-linear models for Rotor-AMB system drop

et al. 2016

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Abstract. The proposed investigation deals with the assessment of several models for the prediction of the dynamic behaviour of turbomachinery supported by Active Magnetic Bearing when drop events occur leading the rotor to drop onto its Touch-Down Bearings (TDBs), which are emergency rolling element bearings in series with a ribbon damper. The rotor exhibits a non-linear transient motion where the amount of damping provided by the ribbon damper is a key parameter for avoiding dangerous behaviours. The ribbon damper is modelled successively with the Masing, the generalized Dahl and the Kelvin-Voigt models. Usually, the TDB is modelled as a viscous damper, used here as reference for comparisons. The originality of this work lies in the new modellings of that ribbon, based on dry-friction theory, where parameters are benchmarked to experimental results. The three models presented are successively integrated in the TDB model followed by rotor drop simulations. Comparisons are done in terms of rotor drop dynamics and show that the transient responses predicted with the Masing and generalized Dahl models are similar.

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Effect of Rotor-Stator Contact on the Mass Unbalance Response

Cited by 8 publications

References 9 publications

Numerical Tracking of Limit Points for Direct Parametric Analysis in Nonlinear Rotordynamics

Numerical Tracking of Limit Points for Direct Parametric Analysis in Nonlinear Rotordynamics

Campbell Diagram Computation for a Drillstring Immersed in Curved Wells

Non-linear models for Rotor-AMB system drop

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