A prognostic method for fault detection in wind turbine drivetrains

Nejad, Amir R.; Odgaard, Peter Fogh; Gao, Zhen; Moan, Torgeir

doi:10.1016/j.engfailanal.2014.04.031

Cited by 53 publications

(34 citation statements)

References 29 publications

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“…The main shaft loads, or the forces and moments, are applied at the end of the main shaft where the rotor hub is connected. The NREL GRC 750-kW multibody model is built up and completed as part of the GRC project, which is verified by experiments for gearbox internal loads and employed in various earlier studies [40][41][42][43][44][45][46][47]. The bearings are modelled with linear diagonal stiffness and with clearances.…”

Section: -Model Verification: Experiments and Instrumentationmentioning

confidence: 99%

Effects of floating sun gear in a wind turbine's planetary gearbox with geometrical imperfections

et al. 2014

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This paper addresses the effect of gear geometrical errors in wind turbine planetary gearboxes with a floating sun gear. Numerical simulations and experiments are employed throughout the study. A National Renewable Energy Laboratory 750-kW gearbox is modelled in a multibody environment and verified using the experimental data obtained from a dynamometer test. The gear geometrical errors, which are both assembly-dependent and assembly-independent, are described, and planet-pin misalignment and eccentricity are selected as the two most influential and key errors for case studies. Various load cases involving errors in the floating and nonfloating sun gear designs are simulated, and the planet-bearing reactions, gear vibrations, gear mesh loads and bearing fatigue lives are compared. All tests and simulations are performed at the rated wind speed.

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Section: -Model Verification: Experiments and Instrumentationmentioning

confidence: 99%

Effects of floating sun gear in a wind turbine's planetary gearbox with geometrical imperfections

et al. 2014

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“…In [11] a multibody model of the NREL GRC 750 kW gearbox is presented, with a number of faults in the gearbox. Frequency analysis are performed in this work to identify potential frequency ranges for fault detection in this gearbox, using both normal available speed measurements and as well additional speed measurements on additional stages in the gearbox.…”

Section: Introductionmentioning

confidence: 99%

“…In this paper the frequency based detection scheme presented in [10] is applied to the data used in [11] and it is shown that faults can be detected using the rotor and generator speed measurements which are standard measurements available in wind turbine control systems.…”

Section: Introductionmentioning

confidence: 99%

Frequency based wind turbine gearbox fault detection applied to a 750 kW wind turbine

Odgaard

Nejad²

2014

2014 IEEE Conference on Control Applications (CCA)

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Abstract-Reliability and availability of modern wind turbines are of increasing importance, for two reasons. The first is due to the fact that power grids around in the world depends at a higher and higher degree on wind energy, and the second is the importance of lowering Cost of Energy of the wind turbines. One of the critical components in modern wind turbines is the gearbox. Failures in the gearbox are costly both due to the cost of the gearbox itself, but also due to lost power generation during repair of it. Wind turbine gearboxes are consequently monitored by condition monitoring systems operating in parallel with the control system, and also uses additional sensors measuring different accelerations and noises, etc. In this paper gearbox data from high fidelity gearbox model of a 750 kW wind turbine gearbox, simulated with and without faults are used to shown the potential of frequency based detection schemes applied on measurements normally available in a wind controller system. This paper shows that two given faults in the gearbox can be detected using a frequency based detection approach applied to sensor signals normally available in the wind turbine control system. This means that gearbox condition monitoring/ fault detection could be included in the standard control system, which potentially can remove the cost of the additional condition monitoring system and the additional sensors used in it.

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“…Heavy ballast deep in 43 the hull gives the platform its stability. In the global analysis, first order and viscous hydrodynamic 44 forces as well as mean wave drift forces were applied and Newman's approximation was used to 45 estimate the difference-frequency wave excitation.…”

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confidence: 99%

“…The MBS tool provides a powerful method for load effect analysis 161 of wind turbine drivetrains and has been successfully used in earlier studies (e.g. [5,41,42,43]). …”

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confidence: 99%

Stochastic dynamic load effect and fatigue damage analysis of drivetrains in land-based and TLP, spar and semi-submersible floating wind turbines

et al. 2015

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This paper deals with the feasibility of using a 5 MW drivetrain which is designed for a land-based turbine, on floating wind turbines. Four types of floating support structures are investigated: spar, TLP and two semi-submersibles. The fatigue damage of mechanical components inside the gearbox and main bearings is compared for different environmental conditions, ranging from cut-in to cutout wind speeds. For floating wind turbines, representative wave conditions are also considered.All wind turbines are ensured to follow similar power curves, but differences in the control system (integral to different concepts) are allowed. A de-coupled analysis approach is employed for the drivetrain response analysis. First, an aero-hydro-servo-elastic code is employed for the global analysis. Next, motions, moments and forces from the global analysis are applied on the gearbox multi body model and the loads on gears and bearings are obtained. The results suggest that the main bearings sustain more damage in floating wind turbines than on land-based. The highest main bearing damage is observed for the spar floating wind turbine. The large wave induced axial load on the main shaft is found to be the primary reason of this high damage in the spar wind turbine. Apart from the main bearings -which are located on the main shaft outside the gearbox -other bearings and gears inside the gearbox hold damages in floating wind turbines equal or even less than in the land-based turbine. It is emphasized that the results presented in this study are based on a drivetrain with two main bearings, which considerably reduces the non-torque loads on

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A prognostic method for fault detection in wind turbine drivetrains

Abstract: In this paper, a prognostic method is presented for fault detection in gears and bearings in wind turbine drivetrains. This method is based on angular velocity measurements from the gearbox input shaft and the output to the generator, using two additional angular velocity

Cited by 53 publications

References 29 publications

Effects of floating sun gear in a wind turbine's planetary gearbox with geometrical imperfections

Effects of floating sun gear in a wind turbine's planetary gearbox with geometrical imperfections

Frequency based wind turbine gearbox fault detection applied to a 750 kW wind turbine

Stochastic dynamic load effect and fatigue damage analysis of drivetrains in land-based and TLP, spar and semi-submersible floating wind turbines

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