Effects of Extreme and Transient Loads on Wind Turbine Drive Trains

Scott, Kenneth G.; Infield, David; Barltrop, Nigel; Coultate, John K.; Shahaj, Anabel

doi:10.2514/6.2012-1293

Cited by 16 publications

(25 citation statements)

References 2 publications

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“…Similarly, Timken have their own proprietary analysis system, Syber, which they use for design optimisation and component selection. A commercially available multibody modelling software, Simpack, has been used to analyse MB loads at a number of operating points, while also exploring the effects of bearing clearance (Sethuraman et al, 2015). In Cardaun et al (2019) a Simpack model is used to investigate the impacts of yaw misalignments on WTMB loads in terms of fatigue life.…”

Section: Multibody Modelsmentioning

confidence: 99%

A review of wind turbine main bearings: design, operation, modelling, damage mechanisms and fault detection

et al. 2020

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This paper presents a review of existing theory and practice relating to main bearings for wind turbines. The main bearing performs the critical role of supporting the turbine rotor, with replacements typically requiring its complete removal. The operational conditions and loading for wind turbine main bearings deviate significantly from those of more conventional power plants and other bearings present in the wind turbine power train, i.e. those in the gearbox and generator. This work seeks to thoroughly document current main-bearing theory in order to allow for appraisal of existing design and analysis practices, while also seeking to form a solid foundation for future research in this area. The most common main-bearing setups are presented along with standards for bearing selection and rating. Typical loads generated by a wind turbine rotor, and subsequently reacted at the main bearing, are discussed. This is followed by the related tribological theories of lubrication, wear and associated failure mechanisms. Finally, existing techniques for bearing modelling, fault diagnosis and prognosis relevant to the main bearing are presented.Published by Copernicus Publications on behalf of the European Academy of Wind Energy e.V.

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Section: Multibody Modelsmentioning

confidence: 99%

A review of wind turbine main bearings: design, operation, modelling, damage mechanisms and fault detection

et al. 2020

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“…Other researchers used ADAMS to investigate dynamic behavior of an offshore WT drivetrain . Combination of multi‐body system and FE will result in models with high level of accuracy for the chosen parts and light enough to carry out dynamic simulations in reasonable time …”

Section: Introductionmentioning

confidence: 99%

Identification of loading conditions resulting in roller slippage in gearbox bearings of large wind turbines

Dąbrowski

Natarajan

2017

Wind Energy

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The dynamic loads on the rollers inside the bearings of large wind turbine gearboxes operating under transient conditions are presented with a focus on identifying conditions leading to slippage of rollers. The methodology was developed using a multi-body model of the drivetrain coupled with aeroelastic simulations of the wind turbine system. A 5 MW reference wind turbine is considered for which a three-stage planetary gearbox is designed on the basis of upscaling of an actual 750 kW gearbox unit. Multi-body dynamic simulations are run using the ADAMS software using a detailed model of the gearbox planetary bearings to investigate transient loads inside the planet bearing. It was found that assembly and pre-loading conditions have significant influence on the bearing's operation. Also, the load distribution in the gearbox bearings strongly depends on wind turbine operation. Wind turbine start-up and shut-down under normal conditions are shown to induce roller slippage, as characterized by loss of contacts and impacts between rollers and raceways. The roller impacts occur under reduced initial pre-load on opposite sides of the load zone followed by stress variation, which can be one of the potential reasons leading to wear and premature bearing failures.While the focus herein is on the gearbox, important WT aspects like aeroelastic interactions and control are included. Aeroelastic models allow interactions between inertial, elastic and aerodynamic forces and their servo mechanisms. Examples of aeroelastic software are FAST 10 developed by NREL, HAWC2 11 by DTU Wind Energy, Bladed 12 developed by DNV-GL and AdWiMo 13 by MSC Software. These calculate WT loads and response in the time domain on the basis of input environmental conditions, but usually, in these models, the gearbox dynamics are neglected. 14 The detailed models for drivetrain components, usually for gearboxes, can be built by lumped parameter models, multi-body system or finite element (FE) method. These models allow simulation of the internal loading resulting from dynamical interactions in the drivetrain. It is important to determine the level of complexity required to balance between accuracy and computational efficiency. According to Guo et al., 15 for drivetrain modeling, the gearbox alone is insufficient to capture component loads and motions; coupling with the main bearing and generator is important. For simulation of loads in a gearbox, it is important to include the clearance in bearings and pre-load, which can influence the non-torque load transfer path, as well as deformations of housing and carrier that can change bearing loads. From the point of view of excitation sources, besides the torque input, the non-torque loads and gravity are relevant. 15 Oyague 14 has presented the state of the art on simulation codes for WT's gearboxes. The author has shown four stages of drivetrain modeling due to model complexity. A purely torsional model of WT drivetrain based on the lumped parameter system with 5 degrees of freedom (DOFs) was used by Mandic...

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“…Some of these studies are focused on analysing the loading on bearings within the WT gearbox under various operation conditions, such as normal operation and shutdown. However, these studies ignored the dynamic behaviour of some key gearbox components (Bruce et al 2015) (Scott et al 2012). Three types of modelling approaches have been examined by Peeters (Peeters et al 2005).…”

Section: Dynamic System Modellingmentioning

confidence: 99%

Effects of model complexity on torsional dynamic responses of NREL 750 kw wind turbine drivetrain

Al-Hamadani¹,

Cartmell²,

Long³

2016

Power Engineering

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Effects of Extreme and Transient Loads on Wind Turbine Drive Trains

Cited by 16 publications

References 2 publications

A review of wind turbine main bearings: design, operation, modelling, damage mechanisms and fault detection

A review of wind turbine main bearings: design, operation, modelling, damage mechanisms and fault detection

Identification of loading conditions resulting in roller slippage in gearbox bearings of large wind turbines

Effects of model complexity on torsional dynamic responses of NREL 750 kw wind turbine drivetrain

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