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Journal of Engineering for Gas Turbines and Power | Volume 129 | Issue 1 | TECHNICAL PAPERS
TECHNICAL PAPERS: Gas Turbines: Structures and Dynamics

Some Experiments on Oil Whirl and Oil Whip

[+] Author and Article Information
A. El-Shafei, S. H. Tawfick, M. S. Raafat, G. M. Aziz

Faculty of Engineering, Department of Mechanical Design and Production, Cairo University, Giza 12316, Egypt

J. Eng. Gas Turbines Power 129(1), 144-153 (Mar 01, 2004) (10 pages) doi:10.1115/1.2181185 History: Received October 01, 2003; Revised March 01, 2004
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The oil whirl and oil whip phenomena have been well known since the early twentieth century. However, there is a lot of confusion on the parameters that affect the onset of instability. In this study, we investigate the onset of instability on a flexible rotor mounted on two plain cylindrical journal bearings. The rotor is run through the first critical speed, the instability, and the second critical speed. Tests are conducted at various unbalance levels, pressures, and misalignment conditions on the coupling. It is shown that, by far, the misalignment of the coupling is the parameter that is most effective on the onset of instability. In particular angular misalignment resulted in the smoothest rotor response.
Copyright © 2007 by American Society of Mechanical Engineers
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+Test rig
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Test rig
Figure 1

Test rig

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+Schematic of test rig
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Schematic of test rig
Figure 2

Schematic of test rig

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+(a) Default rotor data. (b) Rotor Campbell diagram.
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(a) Default rotor data. (b) Rotor Campbell diagram.
Figure 3

(a) Default rotor data. (b) Rotor Campbell diagram.

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+Plain journal bearing
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Plain journal bearing
Figure 4

Plain journal bearing

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+Fluid supply circuit
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Fluid supply circuit
Figure 5

Fluid supply circuit

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+Measurement system
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Measurement system
Figure 6

Measurement system

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+Tracking data, case 1
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Tracking data, case 1
Figure 7

Tracking data, case 1

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+Orbital data, case 1 (speeds in rpm)
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Orbital data, case 1 (speeds in rpm)
Figure 8

Orbital data, case 1 (speeds in rpm)

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+Spectral data (speed 5800rpm), case 1
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Spectral data (speed 5800rpm), case 1
Figure 9

Spectral data (speed 5800rpm), case 1

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+Tracking data, nondrive side bearing
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Tracking data, nondrive side bearing
Figure 10

Tracking data, nondrive side bearing

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+Tracking data, case 2
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Tracking data, case 2
Figure 11

Tracking data, case 2

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+Orbital data, case 2 (speeds in rpm)
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Orbital data, case 2 (speeds in rpm)
Figure 12

Orbital data, case 2 (speeds in rpm)

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+Tracking data, case 3
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Tracking data, case 3
Figure 13

Tracking data, case 3

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+Orbital data, case 3 (speeds in rpm)
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Orbital data, case 3 (speeds in rpm)
Figure 14

Orbital data, case 3 (speeds in rpm)

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+Tracking data, case 4
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Tracking data, case 4
Figure 15

Tracking data, case 4

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+Orbital data, case 4 (speeds in rpm)
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Orbital data, case 4 (speeds in rpm)
Figure 16

Orbital data, case 4 (speeds in rpm)

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+Tracking data, case 5
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Tracking data, case 5
Figure 17

Tracking data, case 5

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+Orbital data, case 5
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Orbital data, case 5
Figure 18

Orbital data, case 5

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+Tracking data, case 6
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Tracking data, case 6
Figure 19

Tracking data, case 6

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+Orbital data, case 6 (speeds in rpm)
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Orbital data, case 6 (speeds in rpm)
Figure 20

Orbital data, case 6 (speeds in rpm)

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+Tracking data, nondrive side bearing, case 6
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Tracking data, nondrive side bearing, case 6
Figure 21

Tracking data, nondrive side bearing, case 6

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+Tracking data, case 7
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Tracking data, case 7
Figure 22

Tracking data, case 7

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+Offset and angular misalignment
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Offset and angular misalignment
Figure 26

Offset and angular misalignment

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+Waterfall plot, case 6
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Waterfall plot, case 6
Figure 25

Waterfall plot, case 6

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+Waterfall plot, case 5
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Waterfall plot, case 5
Figure 24

Waterfall plot, case 5

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+Orbital data, case 7 (speeds in rpm)
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Orbital data, case 7 (speeds in rpm)
Figure 23

Orbital data, case 7 (speeds in rpm)

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