Experimental updating of a segmented wind turbine blade numerical model using the substructure method

During the development of the wind turbine system, blades are considered as the most critical components. The blades’ dynamic characteristics must be investigated during the design process to improve their mechanical performance. This work presents an experimental updating of a segmented wind turbin...

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Bibliographic Details
Published in:Journal of strain analysis for engineering design 2021-02, Vol.56 (2), p.67-75
Main Authors: Yangui, Majdi, Bouaziz, Slim, Taktak, Mohamed, Haddar, Mohamed
Format: Article
Language:English
Subjects:
Algorithms
Assembly
Critical components
Damping ratio
Dynamic characteristics
Fused deposition
Iterative methods
Mathematical models
Mechanical properties
Modal analysis
Model updating
Numerical models
Parameter identification
Resonant frequencies
Segments
Stiffness
Substructures
Three dimensional printing
Turbine blades
Wind turbines
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Summary:During the development of the wind turbine system, blades are considered as the most critical components. The blades’ dynamic characteristics must be investigated during the design process to improve their mechanical performance. This work presents an experimental updating of a segmented wind turbine blade numerical model. For this purpose, the blade segments were manufactured using the fused deposition 3D printing technology and assembled using a threaded spar and nut. For different values of the segments assembly load, the natural frequencies and damping ratios were identified using the eigensystem realization algorithm method. The dynamic behavior of the segmented blade was examined numerically using the three-node shell element, taking into consideration the additional stiffness generated by the applied assembly load. In this study, numerical and experimental modal analysis were used to identify the first five eigenfrequencies of the blade. To update the numerical model parameters, through the identified experimental results, an iterative method was developed based on the Craig–Bampton substructure approach. Results show that the blade natural frequencies are proportional to the segments assembly load. The application of the proposed method on the segmented blade numerical model updating shows that the present method is computationally efficient.
ISSN:0309-3247
2041-3130
DOI:10.1177/0309324720932786