Large Scale Validation of a Flexible Multibody Wind Turbine Gearbox Model

Vanhollebeke, Frederik; Peeters, Pepijn; Helsen, Jan; Lorenzo, Emilio Di; Manzato, Simone; Peeters, Joris; Vandepitte, Dirk; Desmet, Wim

doi:10.1115/1.4028600

Cited by 16 publications

(9 citation statements)

References 14 publications

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“…This specific operating condition will have an impact on the modal behavior observed in the drivetrain, since the teeth can be out of contact during these conditions; whereas this is necessarily the case for nominal power production [23]. Moreover, the damping properties of the wind turbine will change according to the operating conditions [24].…”

Section: Discussion On the First Results Of The Automatic Tracking Ofmentioning

confidence: 99%

Automatic Tracking of the Modal Parameters of an Offshore Wind Turbine Drivetrain System

et al. 2017

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An offshore wind turbine (OWT) is a complex structure that consists of different parts (e.g., foundation, tower, drivetrain, blades, et al.). The last decade, there has been continuous trend towards larger machines with the goal of cost reduction. Modal behavior is an important design aspect. For tackling noise, vibration, and harshness (NVH) issues and validating complex simulation models, it is of high interest to continuously track the vibration levels and the evolution of the modal parameters (resonance frequencies, damping ratios, mode shapes) of the fundamental modes of the turbine. Wind turbines are multi-physical machines with significant interaction between their subcomponents. This paper will present the possibility of identifying and automatically tracking the structural vibration modes of the drivetrain system of an instrumented OWT by using signals (e.g., acceleration responses) measured on the drivetrain system. The experimental data has been obtained during a measurement campaign on an OWT in the Belgian North Sea where the OWT was in standstill condition. The drivetrain, more specifically the gearbox and generator, is instrumented with a dedicated measurement set-up consisting of 17 sensor channels with the aim to continuously track the vibration modes. The consistency of modal parameter estimates made at consequent 10-min intervals is validated, and the dominant drivetrain modal behavior is identified and automatically tracked.

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Section: Discussion On the First Results Of The Automatic Tracking Ofmentioning

confidence: 99%

Automatic Tracking of the Modal Parameters of an Offshore Wind Turbine Drivetrain System

et al. 2017

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“…According to Kramer , the roller bearing damping value varies from 0.25% to 2.5% of the stiffness. Some researchers have taken the damping equal to 1% of the mean stiffness, but for wind turbine gearboxes, the value of 0.2% has also been suggested . It should be noted that damping should be included in the MBS model for numerical stability reasons.…”

Section: Design Basis and Methodologymentioning

confidence: 99%

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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“…The extra effort compared to calculate the ODS are limited, although the Vold-Kalman order tracking is computationally more demanding and the quality of the tacho signal should be high enough to allow a reliable processing of the data. The results of the proposed approach were used in Vanhollebeke et al (2015) to validate the operational response of the analysed gearbox predicted using a flexible multibody model.…”

Section: Discussionmentioning

confidence: 99%

Experimental Characterization of Wind Turbine Gearbox in Operation

Lorenzo

Manzato

2016

Mare-Wint

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The gearbox is one of the key subsystems in a geared wind turbine, as it must transfer the power from the low speed shaft connected to the rotor to the high speed shaft connected to the generator. As turbines become larger, more power can be generated, but consequently gearboxes with higher load capacity need to be designed. Gaining a deep knowledge into gearbox dynamics becomes of fundamental importance and more and more accurate and detailed noise and vibration measurements are demanded. When dealing with a machine in operating conditions with several rotating components and, in particular with a multi-stage transmission system, components are introduced in the signal that make the application of standard techniques such as Operational Modal Analysis (OMA) very difficult and in some cases almost impossible. For this reason, new techniques to tackle with these conditions have been investigated, such as Order Based Modal Analysis (OBMA). As suggested by its own name, this technique is a combination of Order Tracking and Operational Modal Analysis. On one hand, OMA is based upon the calculation of auto-and cross-powers and it works very well for most cases. On the other hand, OBMA is based upon the extracted orders during run-up or coastdown. During such events, the orders are sweeping through a certain frequency band which is useful for characterizing the dynamic behavior of the rotating structures.

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Large Scale Validation of a Flexible Multibody Wind Turbine Gearbox Model

Cited by 16 publications

References 14 publications

Automatic Tracking of the Modal Parameters of an Offshore Wind Turbine Drivetrain System

Automatic Tracking of the Modal Parameters of an Offshore Wind Turbine Drivetrain System

Development of a 5 MW reference gearbox for offshore wind turbines

Experimental Characterization of Wind Turbine Gearbox in Operation

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