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Nonlinear parameter identification of partial rotor rub based on experiment

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Abstract

To model and understand the physics of partial rub, a nonlinear rotor model is sought by applying a nonlinear parameter identification technique to the experimental data. The results show that the nonlinear terms of damping and stiffness should be included to model partial rotor rub. Especially, the impact and friction during the contact between rotor and stator are tried to explain with a nonlinear model on the basis of experimental data. The estimated nonlinear model shows good agreements between the numerical and the experimental results in its orbit. Also, the estimated nonlinear model could explain the backward whirling orbit and jump phenomenon, which are the typical phenomena of partial rub.

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Abbreviations

cx, Cy:

Rotor damping coefficients in two stationary orthogonal directionsx, y

e :

Eccentricity of rotor

f N :

Radial impact force

f T :

Tangential rub force

G :

Center of mass of rotor

kx, ky:

Rotor stiffness coefficients in two stationary orthogonal directionsx, y

m :

Mass of rotor

x(t), y (t) :

Rotor lateral displacements in two stationary orthogonal directions

δ :

Radial clearance between rotor and stator

ε :

Friction coefficient between rotor and stator

ω :

Shaft rotational velocity

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Authors and Affiliations

  1. School of Mechanical Engineering, Sungkyunkwan University, 440- 746, Kyunggi- do, Korea

    Yeon-Sun Choi

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  1. Yeon-Sun Choi
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Correspondence to Yeon-Sun Choi.

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Choi, YS. Nonlinear parameter identification of partial rotor rub based on experiment. KSME International Journal 18, 1969–1977 (2004). https://doi.org/10.1007/BF02990439

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  • DOI: https://doi.org/10.1007/BF02990439

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