Experimental field study of floater motion effects on a main bearing in a full-scale spar floating wind turbine

Torsvik, Jone; Nejad, Amir R.; Pedersen, Eilif

doi:10.1016/j.marstruc.2021.103059

Cited by 10 publications

(3 citation statements)

References 13 publications

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“…A recent full-scale experimental field study of a 6 MW drivetrain on a spar floating substructure (Torsvik et al, 2021) indicates that the effect of wave-induced motions might not be as significant as the wind loading on the drivetrain responses, particularly in larger turbines. A set of strain measurements on the main bearing show that the effect of wave motions is negligible compared with the tower shadow excitation (Torsvik et al, 2021).…”

Section: Drivetrain In Floating Turbinesmentioning

confidence: 99%

Wind turbine drivetrains: state-of-the-art technologies and future development trends

et al. 2022

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Abstract. This paper presents the state-of-the-art technologies and development trends of wind turbine drivetrains – the system that converts kinetic energy of the wind to electrical energy – in different stages of their life cycle: design, manufacturing, installation, operation, lifetime extension, decommissioning and recycling. Offshore development and digitalization are also a focal point in this study. Drivetrain in this context includes the whole power conversion system: main bearing, shafts, gearbox, generator and power converter. The main aim of this article is to review the drivetrain technology development as well as to identify future challenges and research gaps. The main challenges in drivetrain research identified in this paper include drivetrain dynamic responses in large or floating turbines, aerodynamic and farm control effects, use of rare-earth material in generators, improving reliability through prognostics, and use of advances in digitalization. These challenges illustrate the multidisciplinary aspect of wind turbine drivetrains, which emphasizes the need for more interdisciplinary research and collaboration.

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Section: Drivetrain In Floating Turbinesmentioning

confidence: 99%

Wind turbine drivetrains: state-of-the-art technologies and future development trends

et al. 2022

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“…As mentioned above, a typical WT consists of mechanical, electrical, and structural components, apart from the supporting foundation [14]. A brief review of the existing literature reveals that there are significant past research contributions, including laboratory model studies [15][16][17], full-scale field investigations [18][19][20], analyses [21][22][23], and numerical [24][25][26] works, along with appropriate design recommendations [27,28]. Limited studies were carried out in the past on the performance analysis and parametric studies of small-scale wind turbines [29,30].…”

Section: Introductionmentioning

confidence: 99%

Installation and Performance Study of a Vertical-Axis Wind Turbine Prototype Model

2022

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Amongst various sources of renewable energy, the kinetic energy of blowing wind has environmental friendliness and easy availability, together with other benefits. The wind energy is converted into usable electrical energy by means of a robust device termed a wind turbine. To carry out a performance study of such a device, a small-scale model vertical-axis wind turbine was installed at the laboratory and was run by artificial wind energy produced by a pedestal fan for low and medium speeds and a blower for higher speeds. The variation in critical parameters such as output power and voltage with different speeds was studied. The average output power and voltage were observed to increase with average shaft speed with linear and curvilinear patterns, respectively. The vibration produced at the bearing shaft resulting from the rotating components was analyzed as well. As observed, the peak values of critical vibration parameters such as displacement, velocity, acceleration, and frequency mostly varied curvilinearly with average shaft speeds. To study the applicability of the power generation, an electronically controlled automatic drip irrigation system was allowed to run by the wind turbine and important observations were made. Theoretical analyses (numerical and analytical) of the wind flow and power generation were also performed.

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“…more recent study, 6 utilizing field data from 15.3 GW of wind energy capacity and consisting predominantly of 1 to 3 MW three-point-mounted spherical roller main bearings, predicts that by year 20, replacement will be required for 22%-25% of a main bearing population. Concerns regarding main bearing reliability have led to increased research efforts in recent years focused on this component, [7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22] which seek to address premature failures in current and future systems.…”

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confidence: 99%

Wind turbine main bearing rating lives as determined by IEC 61400‐1 and ISO 281: A critical review and exploratory case study

Kenworthy,

Hart,

Stirling

et al. 2023

Wind Energy

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This paper studies the rating lives of wind turbine main bearings, as determined by the IEC 61400‐1 and ISO 281 standards. A critical review of relevant bearing life theory and turbine design requirements is provided, including discussion on possible shortcomings such as the existence (or not) of the bearing fatigue load limit and the validity of assuming linear damage accumulation. A detailed exploratory case study is then undertaken to determine rating lives for two models of main bearing in a 1.5 MW wind turbine. Rating life assessment is carried out under different conditions, including various combinations of main bearing temperature, wind field characteristics, lubricant viscosity, and contamination levels. Rating lives are found to be sufficiently above the desired 20‐year design life for both bearing models under expected operating conditions. For the larger bearing, operational loads are shown to be below or close to the bearing fatigue load limit a vast majority of the time. Key sensitivities for rating life values are temperature and contamination. Overall, the results of this study suggest that an ISO 281 rating life assessment does not account for reported rates of main bearing failures in 1 to 3 MW wind turbines. It is recommended that a similar analysis be undertaken for ISO/TS 16281 rating lives, along with further efforts to identify principal root causes of main bearing failures in future work, possibly leading to a new application standard specific to this component. It is also recommended that the impacts of partial wake impingement on main bearing rating lives are investigated.

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Experimental field study of floater motion effects on a main bearing in a full-scale spar floating wind turbine

Cited by 10 publications

References 13 publications

Wind turbine drivetrains: state-of-the-art technologies and future development trends

Wind turbine drivetrains: state-of-the-art technologies and future development trends

Installation and Performance Study of a Vertical-Axis Wind Turbine Prototype Model

Wind turbine main bearing rating lives as determined by IEC 61400‐1 and ISO 281: A critical review and exploratory case study

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