On the Combination of Geometrically Nonlinear Models and Substructuring for Multibody Simulation of Wind Turbine Blades

Christian Sigurd L. Jensen, Rasmus B. E. Pedersen, Blas Blanco Mula, José Escalona, Ole Balling

Publikation: Bidrag til bog/antologi/rapport/proceedingKonferencebidrag i proceedingsForskningpeer review

Abstract

This study develops a geometrically nonlinear model of a wind turbine blade utilizing finite strain theory for the calculation of elastic forces. The model is based on the floating frame of reference (FFR) formulation, which is a common choice in the modeling of long and flexible wind turbine blades. To model the nonlinear deformation of blades, the FFR formulation divides the structure into several substructures, which involves a significant increase of the system degrees of freedom. In the presented model, a nonlinear description of the elastic forces is introduced to achieve the convergence of the dynamic blade model at a lower number of substructures. The nonlinear elastic forces are formulated according to the Euler-Bernoulli beam theory, and they account for third-order terms of the potential elastic energy, the so-called geometric stiffness. The developed blade model is formulated in two dimensions and tested in a blade of 44.8 m length, which corresponds to a 2.75 MW wind turbine. Firstly, the results show that linear models do not accurately represent tip blade transverse displacement, and the substructuring technique becomes necessary to account for geometric nonlinearity. Secondly, using nonlinear elastic models significantly reduces the number of substructures needed to achieve convergence of the solution.

OriginalsprogEngelsk
Titel18th International Conference on Multibody Systems, Nonlinear Dynamics, and Control (MSNDC)
Antal sider10
ForlagAmerican Society of Mechanical Engineers (ASME)
Publikationsdatonov. 2022
ArtikelnummerDETC2022-90948, V009T09A011
ISBN (Elektronisk)978-0-7918-8630-4
DOI
StatusUdgivet - nov. 2022
BegivenhedASME 2022 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference, IDETC-CIE 2022 - St. Louis, USA
Varighed: 14 aug. 202217 aug. 2022

Konference

KonferenceASME 2022 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference, IDETC-CIE 2022
Land/OmrådeUSA
BySt. Louis
Periode14/08/202217/08/2022
NavnProceedings of the ASME Design Engineering Technical Conference
Vol/bind9

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