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Assessment of passive instability suppression means on pitch-regulated wind turbines

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dc.contributor.author Riziotis, VA en
dc.contributor.author Voutsinas, SG en
dc.contributor.author Politis, ES en
dc.contributor.author Chaviaropoulos, PK en
dc.date.accessioned 2014-03-01T01:27:57Z
dc.date.available 2014-03-01T01:27:57Z
dc.date.issued 2008 en
dc.identifier.issn 1095-4244 en
dc.identifier.uri http://hdl.handle.net/123456789/18651
dc.subject Aeroelastic stability en
dc.subject Eigenvalue modal analysis en
dc.subject Rotor aerodynamics en
dc.subject.classification Energy & Fuels en
dc.subject.classification Engineering, Mechanical en
dc.subject.other Airfoils en
dc.subject.other Damping en
dc.subject.other Eigenvalues and eigenfunctions en
dc.subject.other Modal analysis en
dc.subject.other Aeroelastic stability en
dc.subject.other Eigenvalue modal analysis en
dc.subject.other Rotor aerodynamics en
dc.subject.other Wind turbines en
dc.subject.other Airfoils en
dc.subject.other Damping en
dc.subject.other Eigenvalues and eigenfunctions en
dc.subject.other Modal analysis en
dc.subject.other Wind turbines en
dc.subject.other aerodynamics en
dc.subject.other design en
dc.subject.other eigenvalue en
dc.subject.other model en
dc.subject.other optimization en
dc.subject.other wind turbine en
dc.title Assessment of passive instability suppression means on pitch-regulated wind turbines en
heal.type journalArticle en
heal.identifier.primary 10.1002/we.241 en
heal.identifier.secondary http://dx.doi.org/10.1002/we.241 en
heal.language English en
heal.publicationDate 2008 en
heal.abstract The significance of three types of design modifications in view of defining passive means to extend the stability bounds of modern wind turbines is assessed in this paper. The first concerns the use of optimized airfoil shapes on a fixed blade planform while the other two concern the increase of structural flexibility by either bringing closer the flap and lead-lag mode frequencies or introducing a soft yaw connection. Such an exploration of the stability envelope aims at providing the necessary understanding of the mechanisms that control aeroelastic damping and therefore at identifying means for improving the stability behaviour of the lowest damped system modes. Stability calculations are performed in the context of linear eigenvalue analysis using a state-of-the-art stability tool. The model accounts for the full wind turbine configuration and the eigenvalue problem is formulated with reference to the non-rotating (ground-fixed) frame of reference through the multi-blade transformation of all the rotating degrees of freedom. Results are presented in reference to a commercial multi-MW, pitch-regulated, variable-speed wind turbine. They indicate that the soft yaw concept offers more significant margins of improvement compared with the flap-lag coincidence, while aerodynamic optimization could be a basis for improvement. Copyright © 2007 John Wiley & Sons, Ltd. en
heal.publisher JOHN WILEY & SONS LTD en
heal.journalName Wind Energy en
dc.identifier.doi 10.1002/we.241 en
dc.identifier.isi ISI:000255144400003 en
dc.identifier.volume 11 en
dc.identifier.issue 2 en
dc.identifier.spage 171 en
dc.identifier.epage 192 en


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