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Technical Briefs

Experimental Verification of a Combi-Bearing Model for Vertical Rotor Systems

[+] Author and Article Information
Jean-Claude Luneno

e-mail: jean-claude.luneno@ltu.se

Jan-Olov Aidanpää

e-mail: jan-olov.aidanpaa@ltu.se
Division of Mechanics of Solid Materials,
Luleå University of Technology,
Luleå SE 971 87, Sweden

Rolf Gustavsson

Vattenfall Research and Development,
AB Gävle 803 20, Sweden
e-mail: rolf.gustavsson@vattenfall.com

Contributed by the Design Engineering Division of ASME for publication in the JOURNAL OF VIBRATION AND ACOUSTICS. Manuscript received March 30, 2012; final manuscript received October 24, 2012; published online March 28, 2013. Assoc. Editor: Paul C.-P. Chao.

J. Vib. Acoust 135(3), 034501 (Mar 28, 2013) (5 pages) Paper No: VIB-12-1086; doi: 10.1115/1.4023052 History: Received March 30, 2012; Revised October 24, 2012

Combi-bearing is a combined thrust-journal bearing design used in vertical hydropower rotors. The dynamic characteristics of this component (combi-bearing) were analytically modeled by Luneno et al. (2011, “Model Based Analysis of Coupled Vibrations Due to the Combi-Bearing in Vertical Hydroturbogenerator Rotors,” ASME J. Vib. Acoust., 133, p. 061012). This analytic model was inserted into a finite element model of a vertical rotor rig and numerically simulated. In this paper, the simulated vertical rotor-bearings system is a small-scale vertical machine constructed to validate the analytically derived combi-bearing model. Good agreement was found between the simulation and experimental results. The simulation and experimental results showed that the journal (radial) bearing's position relative to the contact point between the combi-bearing's collar and the rotor influences the rotor system's fundamental natural frequencies. Therefore, the combi-bearing model needs to be included into rotor dynamic models. Neglecting the effect of this component may cause significant errors in the predicted results.

FIGURES IN THIS ARTICLE
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Copyright © 2013 by ASME
Topics: Bearings , Rotors
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References

White, M. F., Torbergsen, E., and Lumpkin, V. A., 1997, “Rotor Dynamic Analysis of a Vertical Pump With Tilting-Pad Journal Bearings,” Wear, 207, pp. 128–136. [CrossRef]
Shiau, T. N., Hsu, W. C., and Chang, J. R., 2004, “Dynamic Response of a Hydrodynamic Thrust Bearing-Mounted Rotor,” ASME J. Eng. Gas Turb. Power, 126, pp. 401–407. [CrossRef]
Luneno, J.-C., Aidanpää, J.-O., and Gustavsson, R., 2011, “Model Based Analysis of Coupled Vibrations Due to the Combi-Bearing in Vertical Hydroturbogenerator Rotors,” ASME J. Vib. Acoust., 133, p. 061012-7. [CrossRef]
Chen, W. J., and Gunter, E. J., 2007, Introduction to Dynamics of Rotor-Bearing Systems, Chap. 5, Trafford Publishing, Victoria, Canada.

Figures

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Fig. 1

(a) Schematic view of the vertical rig's symmetry plane, (b) picture of the actual vertical rig

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Fig. 2

(a) X-Z symmetry plane of the combi-bearing, (b) upper view of the thrust bearing

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Fig. 3

(a) Picture of the combi-bearing, (b) picture of the upper view of the radial bearing

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Fig. 4

Screw-spring-pin-roller assembly

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Fig. 5

Theoretical Campbell diagram

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Fig. 6

Theoretical rotor unbalance responses green line (L = r = 0), solid blue line (L = 25 mm), computed at node 6. Dotted red line (L = 55 mm).

Grahic Jump Location
Fig. 7

Rotor unbalance response computed and measured at node 6: (a) L = 25 mm, (b) L = 55 mm

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