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Research Papers

Coupled Dynamics of a Flexible Horizontal Axis Wind Turbine With Damaged Blades: Experimental and Numerical Validations

[+] Author and Article Information
M. A. Ben Hassena

Research Laboratory of Electro-Mechanical
Systems,
National Engineering School of Sfax,
University of Sfax,
BP 1173, 3038 Sfax, Tunisia
e-mail: b.hassena.med.amin@gmail.com

F. Najar

Applied Mechanics and Systems Research
Laboratory,
Tunisia Polytechnic School,
University of Carthage,
BP 743, 2078 La Marsa, Carthage, Tunisia

S. Choura

Research Laboratory of
Electro-Mechanical Systems,
National Engineering School of Sfax,
University of Sfax,
BP 1173, 3038 Sfax, Tunisia

F. H. Ghorbel

Department of Mechanical Engineering,
Rice University,
Houston, TX 77005-1892
e-mail: ghorbel@rice.edu

1Corresponding author.

Contributed by the Dynamic Systems Division of ASME for publication in the JOURNAL OF DYNAMIC SYSTEMS, MEASUREMENT, AND CONTROL. Manuscript received July 21, 2016; final manuscript received July 4, 2017; published online October 10, 2017. Assoc. Editor: Shankar Coimbatore Subramanian.

J. Dyn. Sys., Meas., Control 140(2), 021012 (Oct 10, 2017) Paper No: DS-16-1360; doi: 10.1115/1.4037529 History: Received July 21, 2016; Revised July 04, 2017

In this paper, we propose a new coupled dynamical model of a horizontal axis wind turbine (HAWT). The proposed model takes into consideration the dynamic coupling of the flexible tower with both bending and torsion of the flexible blades. This model also accounts for the dynamics of an additional point mass located in one of the blades to simulate a crack. In addition, a finite element model (FEM) analysis along with an experimental study is conducted in this research to validate the modal analysis of a HAWT prototype. Data from the analytical, numerical, and experimental investigations were collected and showed comparable findings. Using the analytical model, the modal analysis and the steady-state response of the HAWT prototype are performed for two configurations: with and without a crack. In this paper, we also propose a new model-based technique for the detection of cracks in the HAWT.

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References

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Figures

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Flapping–torsion coupling

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Three-dimensional FE model

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Fig. 6

Validation of the deformed shapes

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Fig. 7

The experimental prototype

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Fig. 8

Experimental modal analysis

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Fig. 9

Acceleration response in presence of cracks

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Fig. 10

Acceleration of the tower base moment in presence of cracks

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