Detecting Shaft-to-Seal Rubbing in Power Generation Turbines With the Acoustic Emission Technology

[+] Author and Article Information
M. Leahy

School of Engineering, Cranfield University, Cranfield, Beds, MK43 0AL, UK

D. Mba1

School of Engineering, Cranfield University, Cranfield, Beds, MK43 0AL, UKd.mba@cranfield.ac.uk

P. Cooper, A. Montgomery, D. Owen

 Alstom Power, Rugby, UK


Corresponding author.

J. Vib. Acoust 128(6), 798-800 (Apr 27, 2006) (3 pages) doi:10.1115/1.2346696 History: Received December 22, 2005; Revised April 27, 2006

This paper presents results of an investigation to assess the potential of the acoustic emission (AE) technology for detecting seal-to-rotor rubbing in power generation turbines. The experimental program involved inducing rubs at various axial locations along a 412ton test rotor, rotating at 3000rpm and supported by 7in.(178mm) journal bearings. Whilst there was no change in vibration levels throughout the tests, bearing mounted AE transducers successfully detected all rubbing induced on the rotor.

Copyright © 2006 by American Society of Mechanical Engineers
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Grahic Jump Location
Figure 1

Schematic of test rig showing rub locations. All dimensions in mm.

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Figure 2

Test rig with the vacuum chamber lid removed

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Figure 3

Rubbing between seal 1 and the rotor (3000rpm). Seal transducer swapped for channel 6 at approximately 270s into the test.

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Figure 4

Rubbing between seal 4 and the rotor (3000rpm). All bearing transducers connected to the AE acquisition system.



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