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Structural model to study the dynamics of wind turbine blades

Grant number: 15/11655-3
Support Opportunities:Regular Research Grants
Duration: October 01, 2015 - September 30, 2017
Field of knowledge:Engineering - Civil Engineering - Structural Engineering
Principal Investigator:Alfredo Gay Neto
Grantee:Alfredo Gay Neto
Host Institution: Escola Politécnica (EP). Universidade de São Paulo (USP). São Paulo , SP, Brazil


The structure of a wind turbine blade is geometrically very complex due to its aerodynamic shape. Generally, the blades are composed by an external shell and internal reinforcements. The whole system provides stiffness to the blade, in a coupled way. Even if the structure changes along distinct cross sections, the blade can be globally-represented by an equivalent beam, with variable stiffness and mass along length. One of the objectives of the present project is to develop a methodology to obtain equivalent properties to a wind turbine blade cross section. It will be used as input to a finite element beam model, representing the blade, keeping its original stiffness and mass. Additionally, we aim to develop a load-model to quantify the aerodynamic forces acting on beam elements. These are non-conservative, depending on the velocity between the blade and the air. To quantify the aerodynamic coefficients, the model will consider existing aerodynamic coefficient curves in literature. The loading will depend on the beam deformed shape, which represents a geometric nonlinearity. It will be implemented in and existing finite element code, developed by the lead researcher.By the end of the project, we expect to be able to simulate the global behavior of wind turbine blades, in operational/extreme scenarios. The model will help to predict loading transmitted from the blades to the remaining wind turbine structure. Furthermore, it would predict internal loads along the blade length. The results are contributions to analysis and design of wind turbine structures. (AU)

Articles published in Pesquisa FAPESP Magazine about the research grant:
Una nueva boya para medir los vientos oceánicos 
New buoy for measuring ocean winds 
The power of marine winds 
La fuerza de los vientos marinos 
Articles published in Agência FAPESP Newsletter about the research grant:
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Scientific publications (4)
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
GAY NETO, ALFREDO. Simulation of mechanisms modeled by geometrically-exact beams using Rodrigues rotation parameters. COMPUTATIONAL MECHANICS, v. 59, n. 3, p. 459-481, . (15/11655-3)
NETO, ALFREDO GAY; PIMENTA, PAULO DE MATTOS; MARTINS, CLOVIS DE ARRUDA. Hydrostatic Pressure Load in Pipes Modeled Using Beam Finite Elements: Theoretical Discussions and Applications. JOURNAL OF ENGINEERING MECHANICS, v. 143, n. 4, . (15/11655-3)
FACCIO JUNIOR, CELSO JACO; PEGORARO CARDOZO, ANA CAROLINA; MONTEIRO JUNIOR, VALDEMAR; NETO, ALFREDO GAY. Modeling wind turbine blades by geometrically-exact beam and shell elements: A comparative approach. ENGINEERING STRUCTURES, v. 180, p. 357-378, . (15/11655-3)

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