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TECHNICAL PAPERS: Gas Turbines: Controls and Diagnostics

A New Technique for Identifying Synchronous Resonances Using Tip-Timing

[+] Author and Article Information
Steve Heath

Electronic and Measurement Technology Department, Rolls Royce plc, PO Box 31, Derby DE24 8BJ, UK

J. Eng. Gas Turbines Power 122(2), 219-225 (Jan 03, 2000) (7 pages) doi:10.1115/1.483198 History: Received March 09, 1999; Revised January 03, 2000
Copyright © 2000 by ASME
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References

Figures

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Typical blade tip-timing system elements
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Comparison of actual and measured response amplitudes for different measurement positions
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Polar plot for single-degree-of-freedom-system resonance
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Plots of xA versus xB for differing probe spacing
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Definition of two-parameter plot terms
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Relationship between axis ratio, major axis angle, and probe spacing
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Plot for increased assembly mistuning
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Measured displacement versus speed plot
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Measured two-parameter plot for speed range 2200 to 2450 RPM
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Results of ellipse fit to two-parameter data for speed range 2200 to 2315 RPM
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Mode 2 amplitude at probes 1 to 3
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Mode 3 amplitude at probes 1 to 3
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Mode 2 order from two-parameter analysis of two decelerations
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Mode 3 order from two-parameter analysis of one deceleration

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