An efficient electromagnetic and thermal modelling of eddy current pulsed thermography for quantitative evaluation of blade fatigue cracks in heavy-duty gas turbines

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dc.contributor.authorTong, Zongfei
dc.contributor.authorXie, Shejuan
dc.contributor.authorLiu, Haochen
dc.contributor.authorZhang, Weixu
dc.contributor.authorPei, Cuixiang
dc.contributor.authorLi, Yong
dc.contributor.authorChen, Zhenmao
dc.contributor.authorUchimoto, Tetsuya
dc.contributor.authorTakagi, Toshiyuki
dc.date.accessioned2020-09-01T14:47:43Z
dc.date.available2020-09-01T14:47:43Z
dc.date.issued2020-03-19
dc.description.abstractThe blade surface fatigue cracks often occur during service of Heavy-Duty Gas Turbines (HDGT) in high temperature, high rotational velocity and high frequency vibration environment. These fatigue cracks seriously threaten the safe operation of heavy-duty gas turbines, which would cause significant hazard or economic loss. The quantitative evaluation of blade surface fatigue cracks is extremely significant to HDGT. Eddy current pulsed thermography (ECPT) is an emerging non-destructive testing technology and show great potential for fatigue crack evaluation. This paper proposes a novel electromagnetic and thermal modelling of ECPT to achieve fast and effective quantitative evaluation for surface fatigue cracks. First, the proposed numerical method calculates electromagnetic field using the reduced magnetic vector potential method in the frequency domain based on frequency series method. The thermal source is transformed to an equivalent and simple form according to the energy equivalent method. Second, the temperature signals of ECPT are calculated through the time-domain iteration strategy with a relatively large time step. Then the ECPT experimental setup is established and the developed simulator is validated numerically and experimentally. The developed simulator is five times faster than the previous one and can be applied to eddy current thermography (ECT) with any kind of excitation waveforms. Finally, the depth of surface fatigue crack is quantitatively evaluated by means of the developed simulator, which is not only a promising simulation progress for ECPT, but also can be an effective tool embedded HDGT though-life maintenanceen_UK
dc.identifier.citationTong Z, Xie S, Liu H, et al., (2020) An efficient electromagnetic and thermal modelling of eddy current pulsed thermography for quantitative evaluation of blade fatigue cracks in heavy-duty gas turbines. Mechanical Systems and Signal Processing, Volume 142, August 2020, Article number 106781en_UK
dc.identifier.issn0888-3270
dc.identifier.urihttps://doi.org/10.1016/j.ymssp.2020.106781
dc.identifier.urihttps://dspace.lib.cranfield.ac.uk/handle/1826/15738
dc.language.isoenen_UK
dc.publisherElsevieren_UK
dc.rightsAttribution-NonCommercial-NoDerivatives 4.0 International*
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/*
dc.subjectHeavy-duty gas turbinesen_UK
dc.subjectFourier series methoden_UK
dc.subjectQuantitative evaluationen_UK
dc.subjectBlade fatigue cracksen_UK
dc.subjectEnergy equivalent methoden_UK
dc.subjectEddy current pulsed thermographyen_UK
dc.titleAn efficient electromagnetic and thermal modelling of eddy current pulsed thermography for quantitative evaluation of blade fatigue cracks in heavy-duty gas turbinesen_UK
dc.typeArticleen_UK

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