Matching experimental and numerical data of dynamic power train loads by modeling of defects

Heege, Andreas; Hemmelmann, Jan

doi:10.1002/we.1711

Cited by 4 publications

(6 citation statements)

References 8 publications

(8 reference statements)

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“…Moreover, the dynamic excitations of a gearbox are classified in external and internal groups . A wind turbine's gearbox is connected to blades at one end and the generator at the other end.…”

Section: Results: 5mw Reference Gearbox Descriptionmentioning

confidence: 99%

“…A wind turbine's gearbox is connected to blades at one end and the generator at the other end. The excitations induced by external forces include grid oscillations (for synchronous generators), control influences, the tower wind shadow and rotor mass imbalance . From the rotor side, the harmonics occur at integer multiples of rotor speed, and therefore, the external excitations are often shown as 1 P , 2 P and 3 P and more, where f 1 P is defined as follows:

f_{1 P} = \frac{N_{rotor}}{60}

where N r o t o r is the rotor speed in rpm and f 1 P is obtained in hertz.…”

Section: Results: 5mw Reference Gearbox Descriptionmentioning

confidence: 99%

“…1 Moreover, the dynamic excitations of a gearbox are classified in external and internal groups. 19,56,57 A wind turbine's gearbox is connected to blades at one end and the generator at the other end. The excitations induced by external forces include grid oscillations (for synchronous generators), control influences, the tower wind shadow and rotor mass imbalance.…”

Section: Namementioning

confidence: 99%

“…The excitations induced by external forces include grid oscillations (for synchronous generators), control influences, the tower wind shadow and rotor mass imbalance. 56,57 From the rotor side, the harmonics occur at integer multiples of rotor speed, and therefore, the external excitations are often shown as 1P, 2P and 3P and more, where f 1P is defined as follows:…”

Section: Namementioning

confidence: 99%

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Development of a 5 MW reference gearbox for offshore wind turbines

et al. 2015

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This paper presents detailed descriptions, modelling parameters and technical data of a 5 MW high speed gearbox developed for the National Renewable Energy Laboratory (NREL) offshore 5 MW baseline wind turbine. The main aim of this article is to support the concept studies and researches for large offshore wind turbines by providing a baseline gearbox model with detailed modelling parameters. This baseline gearbox follows the most conventional design types of those used in wind turbines. The gearbox consists of three stages, two planetary and one parallel stage gears. The gear ratios among the stages are calculated in a way to obtain the minimum gearbox weight. The gearbox components are designed and selected based on the offshore wind turbine design codes and validated by comparison with the data available from the manufacturer of large offshore wind turbine prototypes. All parameters required to establish the dynamic model of the gearbox are then provided. Moreover, a maintenance map indicating components with high to low probability of failure is shown. The 5 MW reference gearbox can be used as a baseline for research on wind turbine gearboxes and comparison studies. It can also be employed in global analysis tools to represent a more realistic model of gearbox in the coupled analysis.

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Section: Results: 5mw Reference Gearbox Descriptionmentioning

confidence: 99%

f_{1 P} = \frac{N_{rotor}}{60}

where N r o t o r is the rotor speed in rpm and f 1 P is obtained in hertz.…”

Section: Results: 5mw Reference Gearbox Descriptionmentioning

confidence: 99%

Section: Namementioning

confidence: 99%

Section: Namementioning

confidence: 99%

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Development of a 5 MW reference gearbox for offshore wind turbines

et al. 2015

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“…12 In practice, a full understanding of the behaviour of a WT drivetrain can only be gained by undertaking a sophisticated analysis including the 3D dynamic response. For example, Heege et al 13 demonstrate that for large turbines, various sources of excitation can give rise to periodic dynamic 3D orbits of the misalignment between the gearbox and the generator. In 2011, Helsen et al used advanced multi-body modelling techniques to describe the complex modal behaviour of large WT gearboxes.…”

Section: Introductionmentioning

confidence: 99%

Improving wind turbine drivetrain bearing reliability through pre-misalignment

et al. 2013

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This is the peer reviewed version of the following article: Whittle, M., Trevelyan, J., Shin, W. and Tavner, P. (2013), Improving wind turbine drivetrain bearing reliability through pre-misalignment. Wind Energy, 17 (8): 12171230 which has been published in nal form at http://dx.doi.org/10.1002/we.1629. This article may be used for non-commercial purposes in accordance With Wiley Terms and Conditions for self-archiving.Additional information: Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-prot purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. AbstractImproving the reliability of wind turbines (WT) is an essential component in the bid to minimise the cost of energy, especially for offshore wind due to the difficulties associated with access for maintenance. Numerous studies have shown that WT gearbox and generator failure rates are unacceptably high, particularly given the long downtime incurred per failure. There is evidence that bearing failures of the gearbox high speed stage (HSS) and generator account for a significant proportion of these failures. However, the root causes of these failure data are not known and there is, therefore, a need for fundamental computational studies to support the valuable 'top down' reliability analyses. In this paper a real (proprietary) 2 MW geared WT was modelled in order to compute the gearbox-generator misalignment and predict the impact of this misalignment upon the gearbox HSS and generator bearings. At rated torque misalignment between the gearbox and generator of 8500 µm was seen. For the 2 MW WT analysed the computational data show that the L 10 fatigue lives of the gearbox HSS bearings were not significantly affected by this misalignment but that the L 10 fatigue lives of the generator bearings, particularly the drive-end bearing, could be significantly reduced. It is proposed to apply a nominal offset to the generator in order to reduce the misalignment under operation thereby reducing the loading on the gearbox HSS and generator bearings. The value of performing integrated systems analyses has been demonstrated and a robust methodology has been outlined.

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Determination of Wind Turbine Main Bearing Load Distribution

Kock

Jacobs

Bosse

2019

J. Phys.: Conf. Ser.

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The presented paper introduces simulative method for the determination of load and pressure distribution in the main roller bearings in multi-MW wind turbines. This method has been developed using the example of a generic 6 MW research wind turbine (WT). The investigated drive train comprises of a main gearbox and is mounted with a four point suspension. The fixed rotor bearing is a spherical roller bearing and the floating rotor bearing is a cylindrical roller bearing. The load and pressure distribution is determined by finite element (FE) simulation under consideration of real hub loads and elastic surroundings. The hub loads have been calculated using Multibody Simulation. Three different rotor bearing models are introduced, which consider FE contact conditions, macro-geometry, stiffness and rolling element profile. The developed method is transferable to different rolling bearing types and can be used to improve bearing load and pressure distribution in multi-MW WTs under consideration of elastic surroundings (main shaft, frame and bearing housing).

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Matching experimental and numerical data of dynamic power train loads by modeling of defects

Cited by 4 publications

References 8 publications

Development of a 5 MW reference gearbox for offshore wind turbines

Development of a 5 MW reference gearbox for offshore wind turbines

Improving wind turbine drivetrain bearing reliability through pre-misalignment

Determination of Wind Turbine Main Bearing Load Distribution

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