Inductive sensors for blade tip-timing in gas turbines

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Abstract

The paper reviews features and applications of the upgraded inductive sensor for BTT, which is able to operate in contact with exhaust gases of temperature even as high as 1200 K. The new design includes metal-ceramic housing ensuring proper heat transfer, magnetic circuit containing set of permanent magnets with various magnetic field values and Curie temperatures, completely redesigned windings and current/voltage converter used instead of an electromotive force amplifier. Its principle of operation is based on electro-dynamical interaction and therefore it may be referred as a passive eddy-current sensor. The sensor technique has been demonstrated on four stages of a surplus military turbofan including the high pressure turbine as part of the engine health monitoring system. We present signal samples and review methods used for online processing of time-of-arrival signals when only a limited number of sensors is available.

[2] A European Lab Gap Matrix. European Virtual Institute for Gas Turbine Instrumentation

[3] J. S. Wilson. “Sensor Technology Handbook”, Newnes, ISBN-13: 978-0750677295 (2004).

[4] E. Rokicki, R. Przysowa, J. Spychała, R. Szczepanik, M. Perz. “Electronic system of current inductive sensor, especially for measurement of flow blades vibrations of rotor machines”, Polish patent PAT.209634 (2007).

[5] R. Szczepanik, R. Przysowa, J. Spychała, E. Rokicki, K Kaźmierczak., P. Majewski “Application of Blade-tip Sensors to Blade-Vibration Monitoring in Gas Turbines” in: Thermal Power Plants. ISBN 978-953-307-952-3. InTech - Open Access Publisher. Rijeka. Croatia (2011)

[6] E. Rokicki, J. Spychala, R. Szczepanik, P. Majewski. “Measuring vibrations of a turbo-machine rotor blade with the help of an induction sensor in high temperature”. US 8125215 B2 (2009).

[7] R. Przysowa, J. Spychała, Health Monitoring of Turbomachinery Based on Blade Tip-Timing and Tip-Clearance, RTO-MP-AVT-157-14, 2008

[8] K. Chana Engine Experience of Non-optical Tip Timing Sensors in: Tip timing and tip clearance problems in turbomachinery, Lecture Series, von Karman Institute for Fluid Dynamics, VKI-LS-2007.

[9] R. Przysowa Analysis of synchronous blade vibration with the use of linear sine fitting, Journal of KONBiN, 2(30), pp. 5-20, De Gruyter Open (2014).

[10] R. Tomassini, JF Brouckaert, G. Rossi Contactless magnetoresistive sensor for tip timing and tip clearance measurement systems STO-MP-AVT-229-14 (2015).

[11] M. Witos, R. Szczepanik “Turbine Engine Health/Maintenance Status Monitoring with Use of Phase-Discrete Method of Blade Vibration Monitoring” RTO-MP-AVT-121-02 (2005).

[12] R. Przysowa, J. Spychała “Health Monitoring of Turbomachinery Based on Blade Tip-Timing and Tip-Clearance”. RTO-MP-AVT-157-P14. Montreal (2008).

[13] RJ Morris, JW Littles, B. Hall, WD Owen, S. Tulpule, R. Szczepanik, R. Przysowa “Crack Detection and Prognosis Using Non-Contact Time of Arrival Sensors for Fan and Compressor Airfoils In Gas Turbine Engines” AeroMat (2009).

[14] K. Chana, D. Cardwell, L. Gray, B. Hall, “Disk Crack Detection And Prognosis Using Non-Contact Time Of Arrival Sensors”. GT2011-45158.

[15] R. Przysowa, E. Rokicki, P. Majewski Optimized magnetic sensors to measure speed and position in adverse environments. IET & ISA 60th International Instrumentation Symposium (2014). DOI: 10.1049/cp.2014.0552

[16] R. Przysowa, E. Rokicki, P. Majewski Health monitoring of industrial fan blades. 6th EVI-GTI International Gas Turbine Instrumentation Conference, Baden, CH; 11/(2013).

[17] M. Witoś, High sensitive methods for health monitoring of compressor blades and fatigue detection. TheScientificWorldJournal, 2012, 2013: 218460-218460

[18] P. Russhard Derived Once per Rev Signal generation for Blade Tip Timing Systems. IET & ISA 60th International Instrumentation Symposium, paper 5.1 (2014).

[19] T. Nicholas. High cycle fatigue: a mechanics of materials perspective. Elsevier (2006).

[20] M. Zielinski, G. Ziller Noncontact Blade Vibration Measurement System for Aero Engine Application. 17th International Symposium on Airbreathing Engines, Munich, ISABE-2005-1220.

[21] B. Hayes (chair) ANSI/ISA-107.1-2013 Industry Standard File Format for Revolution-Based, Tip Timing Data, www.isa.org

[22] O. Jousselin, P. Russhard A method for establishing the uncertainty levels for aero-engine blade tip amplitudes extracted from blade tip timing data, 10th International Conference on Vibrations in Rotating Machinery - IMECHE, London (2012).

[23] P. Russhard BTT Data Zeroing Techniques, MFPT and ISA’s 59th International Instrumentation Symposium (2013).

Journal of KONBiN

The Journal of Air Force Institute of Technology

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CiteScore 2017: 0.21

SCImago Journal Rank (SJR) 2017: 0.163
Source Normalized Impact per Paper (SNIP) 2017: 0.320

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