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Emergency stop simulation using a finite element model developed for large blade deflections
KTH, School of Engineering Sciences (SCI), Mechanics.
2006 (English)In: Wind Energy, ISSN 1095-4244, E-ISSN 1099-1824, Vol. 9, no 3, 193-210 p.Article in journal (Refereed) Published
Abstract [en]

Predicting the load in every possible situation is necessary in order to build safe and optimized structures. A highly dynamical case where large loads are developed is an emergency stop. Design simulation tools that can cope with the upcoming non-linearities will be especially important as the turbines get bigger and more flexible. The model developed here uses the advanced commercial finite element system MSC.Marc, focused on non-linear design and analysis, to predict the structural response. The aerodynamic model named AERFORCE, used to transform the wind to loads on the blades, is a blade element momentum model. A comparison is made between measured and calculated loads for the Tjaere-borg wind turbine during emergency braking of the rotor. The simulation results correspond well with measured data. The conclusion is that the aeroelastic tool is likely to perform well when simulating more flexible turbines.

Place, publisher, year, edition, pages
2006. Vol. 9, no 3, 193-210 p.
Keyword [en]
wind turbine, structural dynamics, aeroelasticity, finite element; simulation, emergency stop
National Category
Mechanical Engineering
Identifiers
URN: urn:nbn:se:kth:diva-5014DOI: 10.1002/we.154ISI: 000238377100001Scopus ID: 2-s2.0-33745121201OAI: oai:DiVA.org:kth-5014DiVA: diva2:7490
Note
QC 20100826. Tidigare titel: Emergency stop simulation using a FEM model developed for large blade deflections. Uppdaterad från Accepted till Published och titel ändrad 20100826.Available from: 2005-04-04 Created: 2005-04-04 Last updated: 2017-12-05Bibliographically approved
In thesis
1. Aerolastic simulation of wind turbine dynamics
Open this publication in new window or tab >>Aerolastic simulation of wind turbine dynamics
2005 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The work in this thesis deals with the development of an aeroelastic simulation tool for horizontal axis wind turbine applications.

Horizontal axis wind turbines can experience significant time varying aerodynamic loads, potentially causing adverse effects on structures, mechanical components, and power production. The needs for computational and experimental procedures for investigating aeroelastic stability and dynamic response have increased as wind turbines become lighter and more flexible.

A finite element model for simulation of the dynamic response of horizontal axis wind turbines has been developed. The developed model uses the commercial finite element system MSC.Marc, focused on nonlinear design and analysis, to predict the structural response. The aerodynamic model, used to transform the wind flow field to loads on the blades, is a Blade-Element/Momentum model. The aerodynamic code is developed by The Swedish Defence Research Agency (FOI, previously named FFA) and is a state-of-the-art code incorporating a number of extensions to the Blade-Element/Momentum formulation. The software SOSIS-W, developed by Teknikgruppen AB was used to generate wind time series for modelling different wind conditions.

The method is general, and different configurations of the structural model and various type of wind conditions can be simulated. The model is primarily intended for use as a research tool when influences of specific dynamic effects are investigated. Verification results are presented and discussed for an extensively tested Danwin 180 kW stall-controlled wind turbine. Code predictions of mechanical loads, fatigue and spectral properties, obtained at different conditions, have been compared with measurements. A comparison is also made between measured and calculated loads for the Tjæreborg 2 MW wind turbine during emergency braking of the rotor. The simulated results correspond well to measured data.

Place, publisher, year, edition, pages
Stockholm: KTH, 2005. xvii, 85 p.
Series
Trita-MEK, ISSN 0348-467X ; 2005:4
Keyword
Applied mechanics, wind turbine, aeroelastic modelling, rotor aerodynamics, structural dynamics, MSC.Marc, Teknisk mekanik
National Category
Mechanical Engineering
Identifiers
urn:nbn:se:kth:diva-157 (URN)
Public defence
2005-04-08, Sal M3, KTH, Brinellvägen 64, Stockholm, 10:00 (English)
Opponent
Supervisors
Note
QC 20100826Available from: 2005-04-04 Created: 2005-04-04 Last updated: 2012-03-19Bibliographically approved

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