On the non-linear behaviour and orbit patterns of rotor/stator contact with a non-conventional containment bearing

Fonseca, Cesar Augusto; Aguiar, Romulo; Weber, Hans Ingo

doi:10.1016/j.ijmecsci.2015.10.015

Cited by 9 publications

(1 citation statement)

References 14 publications

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“…Rub-impact fault of rotor-stator belongs to classical secondary fault that often occurs in rotating machine. When dealing with the rub-impact fault, the interaction between rotor and stator is usually identified as normal impact and tangential friction [30][31][32][33][34]. In other word, the collision direction is seen as perpendicular to the tangential direction of contact surface.…”

Section: Rub-impact Mechanism Of Disc-casingmentioning

confidence: 99%

Dynamics characteristics of a rotor-casing system subjected to axial load and radial rub

Yang

et al. 2018

International Journal of Non-Linear Mechanics

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Aiming at the coupling fault of axial load and radial rub, a geometric nonlinear rotor-casing system is developed in this paper. For the actual case that the aero-engine components (i.e. compressor disc, turbine disc, stator casing, combustor and so on) are sprayed with thermal barrier coatings, the interaction between disc and casing is refined into four stages, including no rub, low rub, rub and high rub. With the increase of invasion depth, the corresponding force models are applied to describe the different impact mechanism. The frictional characteristic between disc and casing is described by the Coulomb model. Then the linear interpolation is used to predict the instantaneous contact of disc-casing and the nonlinear dynamic behaviors of the rotor-casing system subjected to axial load and radial rub are analyzed in the form of bifurcation diagram. Moreover, the rub-impact forms, such as full annular rubbing and partial rubbing, are identified by whirl orbit and waveform. On this basis, the dynamic comparison of the rotor system with/without axial load is conducted. The response variations caused by coating hardness and support stiffness of casing are further discussed.

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