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International Journal of Rotating Machinery
Volume 2007, Article ID 73624, 10 pages
Research Article

A Class of Methods for the Analysis of Blade Tip Timing Data from Bladed Assemblies Undergoing Simultaneous Resonances—Part II: Experimental Validation

1Experimental Vibrations, Rolls-Royce PLC, P.O. Box 31, Derby DE24 8DJ, UK
2School of Mechanical Aerospace and Civil Engineering, The University of Manchester, Simon Building, Oxford Road, Manchester M13 9PL, UK

Received 6 March 2006; Revised 17 November 2006; Accepted 2 January 2007

Academic Editor: Eric Maslen

Copyright © 2007 J. Gallego-Garrido et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Blade tip timing is a technique for the measurement of vibrations in rotating bladed assemblies. In Part I of this work a class of methods for the analysis of blade tip timing data from bladed assemblies undergoing two simultaneous synchronous resonances was developed. The approaches were demonstrated using data from a mathematical simulation of tip timing data. In Part II the methods are validated on an experimental test rig. First, the construction and characteristics of the rig will be discussed. Then, the performance of the analysis techniques when applied to data from the rig will be compared and analysed. It is shown that accurate frequency estimates are obtained by all the methods for both single and double resonances. Furthermore, the recovered frequencies are used to calculate the amplitudes of the blade tip responses. The presence of mistuning in the bladed assembly does not affect the performance of the new techniques.