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Parametric resonance in horizontal axis wind turbines

Record type: Thesis (Doctoral)

Regions of parametric resonance are predicted for the flexible blades of Horizontal Axis Wind Turbines subjected to periodic parametric loading due to gravity. The mathematical model consists of rigid blade flapping, rigid blade lagging and shaft torsion degrees of freedom. A hypothetical hinge offset, flapping and lagging stiffnesses, and aerodynamic loading are considered in the model. Also, hinge inclination which induces stiffness coupling is included in the analysis. The equations of motion (Mathieu/Hill's equations) are investigated using the Harmonic Balance Method for the determination of the main parametric resonance. The analysis has been carried out with the support of the computer algebra system REDUCE. Particular attention is given to: the importance of aerodynamic terms; the influence of coning angle; the influence of the flapping and lagging stiffnesses and the influence of the hinge inclination. The size and position of these regions of instability are significantly affected by these factors. Experimental results are presented from wind tunnel tests in which a Horizontal Axis Wind Turbine model of 1.82m diameter with flexible blades was investigated. The experimental results show clearly some regions of parametric resonance

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Citation

Feitosa, Evaraldo Alencar Do Nacimento (1989) Parametric resonance in horizontal axis wind turbines University of Southampton, Department of Aeronautics and Astronautics, Doctoral Thesis , 191pp.

More information

Published date: January 1989
Organisations: University of Southampton, Aerodynamics & Flight Mechanics

Identifiers

Local EPrints ID: 52253
URI: http://eprints.soton.ac.uk/id/eprint/52253
PURE UUID: f8bb0fb5-162b-40ce-89a8-8dae3eb8b986

Catalogue record

Date deposited: 26 Aug 2008
Last modified: 17 Jul 2017 14:43

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Contributors

Author: Evaraldo Alencar Do Nacimento Feitosa
Thesis advisor: D.J. Mead

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