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Proceedings Paper

Turbomachinery blade vibration measurements with tracking LDV under rotation
Author(s): I. A. Sever; A. B. Stanbridge; D. J. Ewins
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Paper Abstract

A method of measuring vibration response on rotating components using an LDV and its application on bladed disks are presented. Understanding and controlling of vibration amplitudes of bladed disks has been a primary concern for aero-engine manufacturers for many years. The vibration amplitudes of these components are known to be significantly affected by break down of symmetry due to variations in dimensional or material properties. A bladed disk exhibiting these variations is said to be mistuned and considerable research effort is put into acquisition of prediction tools to calculate the effects of these variations. However, the validation of these tools against real measurements is often ignored because of the difficulties involved in application of appropriate excitation and measurement techniques in rotating conditions. In this paper we present successful use of non-intrusive measurement and excitation techniques towards achievement of this goal. These techniques are independent of rotational speed. The so-called self-tracking LDV measurement method used in this paper was introduced in a previous paper by the authors. Here the use of method for acquisition of high quality reference response data for validation of mistuned bladed disks and those fitted with under-platform friction dampers are given.

Paper Details

Date Published: 21 June 2006
PDF: 10 pages
Proc. SPIE 6345, Seventh International Conference on Vibration Measurements by Laser Techniques: Advances and Applications, 63450L (21 June 2006); doi: 10.1117/12.693172
Show Author Affiliations
I. A. Sever, Rolls-Royce plc (United Kingdom)
A. B. Stanbridge, Imperial College London (United Kingdom)
D. J. Ewins, Imperial College London (United Kingdom)

Published in SPIE Proceedings Vol. 6345:
Seventh International Conference on Vibration Measurements by Laser Techniques: Advances and Applications
Enrico Primo Tomasini, Editor(s)

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