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Contactless Diagnostics of Turbine Blade Vibration and Damage

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    0363222 - ÚT 2012 RIV GB eng J - Journal Article
    Procházka, Pavel - Vaněk, František
    Contactless Diagnostics of Turbine Blade Vibration and Damage.
    Journal of Physics: Conference Series. Roč. 305, č. 1 (2011), s. 1-11. E-ISSN 1742-6596.
    [International Conference on Damage Assessment of Structures (DAMAS 2011) /9./. Oxford, 11.07.2011-13.07.2011]
    Institutional research plan: CEZ:AV0Z20760514
    Keywords : steam turbine * blade damage assessment * tip-timing method
    Subject RIV: JL - Materials Fatigue, Friction Mechanics

    The tip-timing method based on the evaluation of time differences of blade passages in different rotor revolutions has been modified and improved to provide more precise and reliable results. A new approach to the analysis of the amplitude and time differences of impulse signals generated by a blade passage has been applied. Amplitudes and frequencies of vibrations and static position of blades ascertained by the diagnostic process are used to establish the state of blade damage. A contactless diagnostic system VDS-UT based on magneto-resistive sensors was developed in the Institute of Thermomechanics Academy of Sciences of the Czech Republic. The system provides on-line monitoring of vibration amplitudes and frequencies of all blades and notification of possible blade damage.Evaluation of the axial and circumferential components of the deflections by measuring the amplitude of blade impulse signals results in an overall improvement of the method.
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