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Research Papers: Gas Turbines: Structures and Dynamics

Model Calibration of Anisotropic Rotordynamic Systems With Speed-Dependent Parameters

[+] Author and Article Information
A. A. Younan, A. El-Shafei

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

J. Eng. Gas Turbines Power 130(4), 042502 (Apr 24, 2008) (10 pages) doi:10.1115/1.2770485 History: Received July 14, 2005; Revised May 11, 2007; Published April 24, 2008

In this paper, a method for calibrating rotordynamic models of speed-dependent systems with anisotropic support is presented. The method is based on the comparison between the calculated eigenvalues and those extracted from the measured synchronous frequency response functions. An eigensensitivity analysis is conducted to calculate the sensitivity of the computed eigenvalues to the selected elements to be updated. This method is suitable for field application since it requires simple coastdown tests. The method is illustrated on a test rig with fluid film bearings and is shown to be effective in the calibration of rotordynamic models at the speeds of the modes excited within the operating speed range.

Copyright © 2008 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Combined waterfall and Campbell diagram of the hypothetical system

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Figure 2

Calibration procedure flow chart

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Figure 3

Experimental test rig used to verify the procedure

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Figure 4

Original calculated Campbell diagram

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Figure 5

First calculated orbital right and left eigenvectors

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Figure 6

Second calculated orbital right and left eigenvectors

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Figure 7

Third calculated orbital right and left eigenvectors

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Figure 8

(a) Horizontal calculated unbalance response. (b) Vertical calculated unbalance response.

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Figure 9

Schematic diagram of the measured points

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Figure 10

(a) Horizontal coastdown (synchronous FRF). (b) Vertical coastdown (synchronous FRF).

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Figure 11

First orbital mode shape (1593cycles∕min)

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Figure 12

Second orbital mode shape (3614cycles∕min)

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Figure 13

Third orbital mode shape (4045cycles∕min)

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Figure 14

Updated Campbell diagram based on the correction parameters of the first critical speed

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Figure 15

Updated Campbell diagram based on the correction parameters of the second critical speed

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Figure 16

The comparison between the measured, original, and updated mode shapes

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