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Modelling and experimental validation of active and passive eddy current sensors for blade tip timing / Nidhal Jamia; Michael Friswell; Sami El-Borgi; Prakash Rajendran

Sensors and Actuators A: Physical, Volume: 285, Pages: 98 - 110

Swansea University Authors: Nidhal, Jamia, Michael, Friswell

Abstract

To monitor the vibration of blades in rotating machinery, the contactless method called Blade Tip Timing (BTT) is widely used. blade vibration and clearance are important diagnostic features for condition monitoring, including the detection of blade cracks. To perform the BTT technique, optical sens...

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Published in: Sensors and Actuators A: Physical
ISSN: 0924-4247
Published: 2019
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URI: https://cronfa.swan.ac.uk/Record/cronfa46100
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first_indexed 2018-11-26T20:21:26Z
last_indexed 2019-01-14T19:59:34Z
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spelling 2019-01-14T16:51:39.8714792 v2 46100 2018-11-26 Modelling and experimental validation of active and passive eddy current sensors for blade tip timing 846b2cd3a7717b296654010df30cb22a 0000-0003-0643-7812 Nidhal Jamia Nidhal Jamia true false 5894777b8f9c6e64bde3568d68078d40 Michael Friswell Michael Friswell true false 2018-11-26 EEN To monitor the vibration of blades in rotating machinery, the contactless method called Blade Tip Timing (BTT) is widely used. blade vibration and clearance are important diagnostic features for condition monitoring, including the detection of blade cracks. To perform the BTT technique, optical sensors were widely used by industry due to their high accuracy, but the main drawback of these systems is their low tolerance to the presence of contaminants. To overcome this downside, eddy current sensors are a good alternative for health monitoring applications in gas turbines due to their insensitivity to contaminants and debris. This type of sensor has been used by many researchers, predominantly on the experimental side to investigate BTT systems and there is a lack of modelling to support the measurement system design. This paper fills the gap between experiments and modelling for the particular case of a blade rotating past eddy current sensors. Hence the novelty of this paper is the simulation of the BTT application using detailed quasi-static finite element models of the electro-magnetic field to estimate the outputs from active and passive eddy current sensors. A test rig composed of a bladed disk with 12 blades clamped to a rotating shaft was designed and manufactured in order to validate the proposed models with experimental measurements. Finally, a parametric study is presented to show the effect of the blade tip clearance and the rotational speed on the accuracy of the BTT measurement. This leads to better understanding of the sources of error in the time of arrival of the blades passing the sensor and hence insight into the blade vibration measurement accuracy. Journal Article Sensors and Actuators A: Physical 285 98 110 0924-4247 Passive eddy current sensor, Active eddy current sensor, Blade tip timing, Electro-magnetic field, Quasi-static finite element model 31 12 2019 2019-12-31 10.1016/j.sna.2018.10.034 COLLEGE NANME Engineering COLLEGE CODE EEN Swansea University 2019-01-14T16:51:39.8714792 2018-11-26T13:19:58.4579800 College of Engineering Engineering Nidhal Jamia 0000-0003-0643-7812 1 Nidhal Jamia 2 Michael Friswell 3 Sami El-Borgi 4 Prakash Rajendran 5 0046100-26112018141041.pdf jamia2018(2).pdf 2018-11-26T14:10:41.8930000 Output 12634858 application/pdf Accepted Manuscript true 2019-11-08T00:00:00.0000000 true eng
title Modelling and experimental validation of active and passive eddy current sensors for blade tip timing
spellingShingle Modelling and experimental validation of active and passive eddy current sensors for blade tip timing
Nidhal, Jamia
Michael, Friswell
title_short Modelling and experimental validation of active and passive eddy current sensors for blade tip timing
title_full Modelling and experimental validation of active and passive eddy current sensors for blade tip timing
title_fullStr Modelling and experimental validation of active and passive eddy current sensors for blade tip timing
title_full_unstemmed Modelling and experimental validation of active and passive eddy current sensors for blade tip timing
title_sort Modelling and experimental validation of active and passive eddy current sensors for blade tip timing
author_id_str_mv 846b2cd3a7717b296654010df30cb22a
5894777b8f9c6e64bde3568d68078d40
author_id_fullname_str_mv 846b2cd3a7717b296654010df30cb22a_***_Nidhal, Jamia
5894777b8f9c6e64bde3568d68078d40_***_Michael, Friswell
author Nidhal, Jamia
Michael, Friswell
author2 Nidhal Jamia
Nidhal Jamia
Michael Friswell
Sami El-Borgi
Prakash Rajendran
format Journal article
container_title Sensors and Actuators A: Physical
container_volume 285
container_start_page 98
publishDate 2019
institution Swansea University
issn 0924-4247
doi_str_mv 10.1016/j.sna.2018.10.034
college_str College of Engineering
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hierarchy_top_title College of Engineering
hierarchy_parent_id collegeofengineering
hierarchy_parent_title College of Engineering
department_str Engineering{{{_:::_}}}College of Engineering{{{_:::_}}}Engineering
document_store_str 1
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description To monitor the vibration of blades in rotating machinery, the contactless method called Blade Tip Timing (BTT) is widely used. blade vibration and clearance are important diagnostic features for condition monitoring, including the detection of blade cracks. To perform the BTT technique, optical sensors were widely used by industry due to their high accuracy, but the main drawback of these systems is their low tolerance to the presence of contaminants. To overcome this downside, eddy current sensors are a good alternative for health monitoring applications in gas turbines due to their insensitivity to contaminants and debris. This type of sensor has been used by many researchers, predominantly on the experimental side to investigate BTT systems and there is a lack of modelling to support the measurement system design. This paper fills the gap between experiments and modelling for the particular case of a blade rotating past eddy current sensors. Hence the novelty of this paper is the simulation of the BTT application using detailed quasi-static finite element models of the electro-magnetic field to estimate the outputs from active and passive eddy current sensors. A test rig composed of a bladed disk with 12 blades clamped to a rotating shaft was designed and manufactured in order to validate the proposed models with experimental measurements. Finally, a parametric study is presented to show the effect of the blade tip clearance and the rotational speed on the accuracy of the BTT measurement. This leads to better understanding of the sources of error in the time of arrival of the blades passing the sensor and hence insight into the blade vibration measurement accuracy.
published_date 2019-12-31T04:09:21Z
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