Condition monitoring of spar-type floating wind turbine drivetrain using statistical fault diagnosis

Mahdi Ghane*, Amir Rasekhi Nejad, Mogens Blanke, Zhen Gao, Torgeir Moan

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

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Abstract

Operation and maintenance costs are significant for large-scale wind turbines, and particularly so for offshore. A well-organized operation and maintenance strategy is vital to ensure the reliability, availability, and cost-effectiveness of a system. The ability to detect, isolate, estimate and perform prognoses on component degradation could become essential to reduce unplanned maintenance and downtime. Failures in gearbox components are in focus since they account for a
large share of wind turbine (WT) downtime. This study considers detection and estimation of wear in the downwind main shaft bearing of a 5 MW spar-type floating turbine. Using a high-fidelity gearbox model, we show how the downwind main bearing and nacelle axial accelerations can be used to evaluate the condition of the bearing. The paper shows how relative acceleration can be evaluated using statistical change detection methods to perform a reliable estimation of wear of the bearing. It is shown in the paper that the amplitude distribution of the residual accelerations follows a t-distribution and a change detection test is designed for the specific changes we observe when the main bearing becomes worn. The generalized likelihood ratio (GLR) test is extended to fit the particular distribution encountered in this problem, and closedform expressions are derived for shape and scale parameter estimation, which are indicators for wear and extent of wear
in the bearing. The results in this paper show how the proposed approach can detect and estimate wear in the bearing according to desired probabilities of detection and false alarm
Original languageEnglish
JournalWind Energy
Volume21
Issue number7
Pages (from-to)575-589
ISSN1095-4244
DOIs
Publication statusPublished - 2018

Keywords

  • Statistical Change Detection
  • Floating Wind Turbine
  • Wind Turbine Gearbox
  • Main Bearing
  • Fault Detection
  • Condition Monitoring

Cite this

Ghane, Mahdi ; Nejad, Amir Rasekhi ; Blanke, Mogens ; Gao, Zhen ; Moan, Torgeir. / Condition monitoring of spar-type floating wind turbine drivetrain using statistical fault diagnosis. In: Wind Energy. 2018 ; Vol. 21, No. 7. pp. 575-589.
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title = "Condition monitoring of spar-type floating wind turbine drivetrain using statistical fault diagnosis",
abstract = "Operation and maintenance costs are significant for large-scale wind turbines, and particularly so for offshore. A well-organized operation and maintenance strategy is vital to ensure the reliability, availability, and cost-effectiveness of a system. The ability to detect, isolate, estimate and perform prognoses on component degradation could become essential to reduce unplanned maintenance and downtime. Failures in gearbox components are in focus since they account for alarge share of wind turbine (WT) downtime. This study considers detection and estimation of wear in the downwind main shaft bearing of a 5 MW spar-type floating turbine. Using a high-fidelity gearbox model, we show how the downwind main bearing and nacelle axial accelerations can be used to evaluate the condition of the bearing. The paper shows how relative acceleration can be evaluated using statistical change detection methods to perform a reliable estimation of wear of the bearing. It is shown in the paper that the amplitude distribution of the residual accelerations follows a t-distribution and a change detection test is designed for the specific changes we observe when the main bearing becomes worn. The generalized likelihood ratio (GLR) test is extended to fit the particular distribution encountered in this problem, and closedform expressions are derived for shape and scale parameter estimation, which are indicators for wear and extent of wearin the bearing. The results in this paper show how the proposed approach can detect and estimate wear in the bearing according to desired probabilities of detection and false alarm",
keywords = "Statistical Change Detection, Floating Wind Turbine, Wind Turbine Gearbox, Main Bearing, Fault Detection, Condition Monitoring",
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Condition monitoring of spar-type floating wind turbine drivetrain using statistical fault diagnosis. / Ghane, Mahdi; Nejad, Amir Rasekhi; Blanke, Mogens; Gao, Zhen; Moan, Torgeir.

In: Wind Energy, Vol. 21, No. 7, 2018, p. 575-589.

Research output: Contribution to journalJournal articleResearchpeer-review

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T1 - Condition monitoring of spar-type floating wind turbine drivetrain using statistical fault diagnosis

AU - Ghane, Mahdi

AU - Nejad, Amir Rasekhi

AU - Blanke, Mogens

AU - Gao, Zhen

AU - Moan, Torgeir

PY - 2018

Y1 - 2018

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AB - Operation and maintenance costs are significant for large-scale wind turbines, and particularly so for offshore. A well-organized operation and maintenance strategy is vital to ensure the reliability, availability, and cost-effectiveness of a system. The ability to detect, isolate, estimate and perform prognoses on component degradation could become essential to reduce unplanned maintenance and downtime. Failures in gearbox components are in focus since they account for alarge share of wind turbine (WT) downtime. This study considers detection and estimation of wear in the downwind main shaft bearing of a 5 MW spar-type floating turbine. Using a high-fidelity gearbox model, we show how the downwind main bearing and nacelle axial accelerations can be used to evaluate the condition of the bearing. The paper shows how relative acceleration can be evaluated using statistical change detection methods to perform a reliable estimation of wear of the bearing. It is shown in the paper that the amplitude distribution of the residual accelerations follows a t-distribution and a change detection test is designed for the specific changes we observe when the main bearing becomes worn. The generalized likelihood ratio (GLR) test is extended to fit the particular distribution encountered in this problem, and closedform expressions are derived for shape and scale parameter estimation, which are indicators for wear and extent of wearin the bearing. The results in this paper show how the proposed approach can detect and estimate wear in the bearing according to desired probabilities of detection and false alarm

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KW - Condition Monitoring

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