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Nonlinear Analysis of Twisted Wind Turbine Blade

Published online by Cambridge University Press:  12 December 2016

M. Yangui ,
S. Bouaziz ,
M. Taktak ,
M. Haddar  and
A. El-Sabbagh
M. Yangui
Affiliation:
Mechanics, Modelling and Production LaboratoryMechanic DepartmentNational School of Engineers of SfaxUniversity of SfaxSfax, Tunisia
S. Bouaziz*
Affiliation:
Mechanics, Modelling and Production LaboratoryMechanic DepartmentNational School of Engineers of SfaxUniversity of SfaxSfax, Tunisia
M. Taktak
Affiliation:
Mechanics, Modelling and Production LaboratoryMechanic DepartmentNational School of Engineers of SfaxUniversity of SfaxSfax, Tunisia
M. Haddar
Affiliation:
Mechanics, Modelling and Production LaboratoryMechanic DepartmentNational School of Engineers of SfaxUniversity of SfaxSfax, Tunisia
A. El-Sabbagh
Affiliation:
ASU Sound and Vibration LabDesign and Production Engineering DepartmentAin Shams UniversityCairo, Egypt
*
*Corresponding author ([email protected])
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Abstract

Modal analysis is developed in this paper in order to study the dynamic characteristics of rotating segmented blades assembled with spar. Accordingly, a three dimensional finite element model was built using the three node triangular shell element DKT18, which has six degrees of freedom, to model the blade and the spar structures. This study covers the effect of rotation speed and geometrically nonlinear problems on the vibration characteristics of rotating blade with various pretwist angles. Likewise, the effect of the spar in the blade is taken into consideration. The equation of motion for the finite element model is derived by using Hamilton's principle, while the resulting nonlinear equilibrium equation is solved by applying the Newmark method combined with the Newton Raphson schema. Results show that the natural frequencies increase by taking account of the spar, they are also proportional to the angular rotation speed and influenced by geometric nonlinearity and pretwist angle.

Keywords

Pretwisted bladeModal analysisGeometric nonlinearityShell element
Type
Research Article
Information
Journal of Mechanics , Volume 34 , Issue 3 , June 2018 , pp. 269 - 278
Copyright
Copyright © The Society of Theoretical and Applied Mechanics 2018 

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