Assessment of Gearbox Operational Loads and Reliability under High Mean Wind Speeds

Dąbrowski, D.; Natarajan, Anand

doi:10.1016/j.egypro.2015.11.404

Cited by 17 publications

(12 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The 5 MW reference gearbox used in this work is composed of a planetary stage and two consecutive parallel stages . The design includes the physical dimensions of the gears, along with the gear mesh stiffness and the torsional stiffness associated with the intermediate shafts connecting each gearbox stage.…”

Section: Methods and Modelsmentioning

confidence: 99%

See 1 more Smart Citation

Ultimate design load analysis of planetary gearbox bearings under extreme events

2016

Self Cite

View full text Add to dashboard Cite

This paper investigates the impact of extreme events on the planet bearings of a 5 MW gearbox. The system is simulated using an aeroelastic tool, where the turbine structure is modeled, and MATLAB/Simulink, where the drivetrain (gearbox and generator) are modeled using a lumped‐parameter approach. Three extreme events are assessed: low‐voltage ride through, emergency stop and normal stop. The analysis is focused on finding which event has the most negative impact on the bearing extreme radial loads. The two latter events are carried out following the guidelines of the International Electrotechnical Commission standard 61400‐1. The former is carried out by applying a voltage fault while simulating the wind turbine under normal turbulent wind conditions. The voltage faults are defined by following the guidelines from four different grid codes in order to assess the impact on the bearings. The results show that the grid code specifications have a dominant role in the maximum loads achieved by the bearings during a low‐voltage ride through. Moreover, the emergency brake shows the highest impact by increasing the bearing loads up to three times the rated value. Copyright © 2016 John Wiley & Sons, Ltd.

show abstract

Section: Methods and Modelsmentioning

confidence: 99%

“…For the current investigation, the reference NREL 5 MW Wind Turbine is used in HAWC2. A recently developed 5 MW gearbox presented by Dabrowski and Natarajan is used with some minor modifications. The reference gearbox was upscaled from a 750 kW gearbox presented previously by NREL.…”

Section: Simulation Setupmentioning

confidence: 99%

Ultimate design load analysis of planetary gearbox bearings under extreme events

2016

Self Cite

View full text Add to dashboard Cite

show abstract

“…In addition to considering the structure of the wind field itself, it is important to consider the impacts of placing a wind turbine into the air flow. With respect to blade and hub loading on a wind turbine rotor, a significant effect is due to tower shadow, this being the blocking effect caused by the tower on the wind flow directly in front of the structure (Dolan and Lehn, 2006). The result is a significant drop in wind speed seen by each blade as it passes the tower.…”

Section: Physical Interactionsmentioning

confidence: 99%

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

et al. 2020

View full text Add to dashboard Cite

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.

show abstract

“…Historically a majority of variable speed wind turbines have used doubly-fed induction generator technology with a multistage gearbox (Polinder et al, 2005). Gearboxes, however, manifest relatively high failure rates and so lost revenue due to down-times and repairs has become a major concern of the wind energy industry (Su et al, 2017;Dabrowski and Natarajan, 2015). New systems have therefore been developed which require gearboxes with fewer stages or are direct-drive (DD), removing the gearbox completely.…”

Section: Main-bearing Configurations and Rolling Elementsmentioning

confidence: 99%

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

Hart¹,

Clarke²,

Nicholas³

et al. 2019

Preprint

View full text Add to dashboard Cite

Abstract. This paper presents a review of existing theory and practice relating to main-bearings for wind turbines. The mainbearing 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 modeling, fault diagnosis and prognosis relevant to the main-bearing are presented.

show abstract

Assessment of Gearbox Operational Loads and Reliability under High Mean Wind Speeds

Cited by 17 publications

References 12 publications

Ultimate design load analysis of planetary gearbox bearings under extreme events

Ultimate design load analysis of planetary gearbox bearings under extreme events

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

Contact Info

Product

Resources

About