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Vibration
Special Issues
Dynamics of Composite Wind Turbine Rotor Blades
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Dynamics of Composite Wind Turbine Rotor Blades

A special issue of Vibration (ISSN 2571-631X).

Deadline for manuscript submissions: closed (31 January 2021) | Viewed by 20182

Special Issue Editor

Prof. Dr. Arash Soleiman-Fallah

E-Mail Website
Guest Editor
Faculty of Technology, Art and Design, Department of Mechanical, Electronics and Chemical Engineering, Oslo Metropolitan University, Pilestredet 46, 0167 Oslo, Norway
Interests: composite materials; phononic metamaterials; lattice dynamics; XFEM; peridynamics; impact mechanics
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Rotor blades are utilised in the design of horizontal- and vertical-axis wind turbines. In operational (service) and extreme (e.g., storm) conditions of dynamic loading, blades respond by vibrating in a combination of modes through time-dependent small and large deflections which generate dynamic strains and stresses. Structural dynamics of a given blade geometry requires an understanding of the nature of loading, material constitutive behaviour, analytical idealisation, mathematical modelling, and methods of evaluation of the dynamic response.

This Special Issue is concerned with dynamical investigation of wind turbine rotor blades. Scientifically sound and well-organised analytical and computational studies are welcome. Areas such as small and large amplitude blade vibration, damage mechanics of rotor blades, blade nonlinear dynamics and chaos, aeroelasticity of blades, modal analysis of rotor blades, transient response, steady-state vibration, flap-wise vibration, lead–lag vibration, flutter instability, torsional vibration, mixed-mode vibration, Fluid-Structure Interaction in blades, optimisation for vibration, probabilistic (indeterministic) analyses, and Fourier analysis are relevant.

Contributions to experimental studies that advance knowledge in the response of blade structures subjected to storm, bird impact, hail impact, earthquake, and other accidental extreme loads are of relevance and interest; nevertheless, they should be accompanied by analysis of the experimental data and appropriate conclusions.

Dr. Arash Soleiman-Fallah
Guest Editor

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Keywords

  • blade vibrations
  • damage mechanics of rotor blades
  • nonlinear dynamics and chaos in rotor blades
  • aeroelasticity of blades
  • modal analysis of rotor blades
  • flutter instability
  • mixed-mode vibration
  • fluid–structure Interaction

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Published Papers (4 papers)

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Research

13 pages, 4650 KiB  
Communication
Finite Element Analysis of Wind Turbine Blade Vibrations
by Navid Navadeh, Ivan Goroshko, Yaroslav Zhuk, Farnoosh Etminan Moghadam and Arash Soleiman Fallah
Vibration 2021, 4(2), 310-322; https://doi.org/10.3390/vibration4020020 - 5 Apr 2021
Cited by 19 | Viewed by 7335
Abstract
The article is devoted to the practical problem of computer simulation of the dynamic behaviour of horizontal axis wind turbine composite rotor blades. This type of wind turbine is the dominant design in modern wind farms, and as such its dynamics and strength [...] Read more.
The article is devoted to the practical problem of computer simulation of the dynamic behaviour of horizontal axis wind turbine composite rotor blades. This type of wind turbine is the dominant design in modern wind farms, and as such its dynamics and strength characteristics should be carefully studied. For this purpose, in this paper the mechanical model of a rotor blade with a composite skin possessing a stiffener was developed and implemented as a finite element model in ABAQUS. On the basis of this computer model, modal analysis of turbine blade vibrations was performed and benchmark cases for the dynamic response were investigated. The response of the system subjected to a uniform underneath pressure was studied, and the root reaction force and blade tip displacement time histories were obtained from the numerical calculations conducted. Full article
(This article belongs to the Special Issue Dynamics of Composite Wind Turbine Rotor Blades)
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15 pages, 7573 KiB  
Article
Combining Computational Fluid Dynamics and Gradient Boosting Regressor for Predicting Force Distribution on Horizontal Axis Wind Turbine
by Nikhil Bagalkot, Arvind Keprate and Rune Orderløkken
Vibration 2021, 4(1), 248-262; https://doi.org/10.3390/vibration4010017 - 14 Mar 2021
Cited by 11 | Viewed by 3531
Abstract
The blades of the horizontal axis wind turbine (HAWT) are generally subjected to significant forces resulting from the flow field around the blade. These forces are the main contributor of the flow-induced vibrations that pose structural integrity challenges to the blade. The study [...] Read more.
The blades of the horizontal axis wind turbine (HAWT) are generally subjected to significant forces resulting from the flow field around the blade. These forces are the main contributor of the flow-induced vibrations that pose structural integrity challenges to the blade. The study focuses on the application of the gradient boosting regressor (GBR) for predicting the wind turbine response to a combination of wind speed, angle of attack, and turbulence intensity when the air flows over the rotor blade. In the first step, computational fluid dynamics (CFD) simulations were carried out on a horizontal axis wind turbine to estimate the force distribution on the blade at various wind speeds and the blade’s attack angle. After that, data obtained for two different angles of attack (4° and 8°) from CFD acts as an input dataset for the GBR algorithm, which is trained and tested to obtain the force distribution. An estimated variance score of 0.933 and 0.917 is achieved for 4° and 8°, respectively, thus showing a good agreement with the force distribution obtained from CFD. High prediction accuracy and less time consumption make GBR a suitable alternative for CFD to predict force at various wind velocities for which CFD analysis has not been performed. Full article
(This article belongs to the Special Issue Dynamics of Composite Wind Turbine Rotor Blades)
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15 pages, 3552 KiB  
Article
Dynamic Analysis of Composite Wind Turbine Blades as Beams: An Analytical and Numerical Study
by Mertol Tüfekci, Ömer Ekim Genel, Ali Tatar and Ekrem Tüfekci
Vibration 2021, 4(1), 1-15; https://doi.org/10.3390/vibration4010001 - 24 Dec 2020
Cited by 20 | Viewed by 5064
Abstract
This study focuses on the dynamic modelling and analysis of the wind turbine blades made of multiple layers of fibre reinforced composites and core materials. For this purpose, a novel three-dimensional analytical straight beam model for blades is formulated. This model assumes that [...] Read more.
This study focuses on the dynamic modelling and analysis of the wind turbine blades made of multiple layers of fibre reinforced composites and core materials. For this purpose, a novel three-dimensional analytical straight beam model for blades is formulated. This model assumes that the beam is made of functionally graded material (FGM) and has a variable and asymmetrical cross section. In this model, the blades are assumed to be thin, slender and long with a relatively straight axis. They have two main parts, namely the core and the shell. The so-called core consists of a lightweight isotropic foam material, which also adds significant damping to the system. The core material is covered by the shell, which is modelled using homogenous and orthotropic material assumptions as the structure is reinforced with continuous fibres. Therefore, the blades are modelled under a straight beam with varying cross-section assumptions, in which the effective elastic properties are acquired by homogenizing the cross section. The beam formulation for modelling the system is performed both analytically and numerically with the finite element method. The results of both methods are in well agreement. The maximum deviation between the results is found below 4%. Full article
(This article belongs to the Special Issue Dynamics of Composite Wind Turbine Rotor Blades)
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13 pages, 3312 KiB  
Article
The Effect of Non-Conservative Compressive Force on the Vibration of Rotating Composite Blades
by Mohammadreza Amoozgar, Mahdi Bodaghi and Rafic M. Ajaj
Vibration 2020, 3(4), 478-490; https://doi.org/10.3390/vibration3040030 - 29 Nov 2020
Cited by 5 | Viewed by 3111
Abstract
This paper investigates the effectiveness of a resonance avoidance concept for composite rotor blades featuring extension–twist elastic coupling. The concept uses a tendon, attached to the tip of the blade, to apply a proper amount of compressive force to tune the vibration behavior [...] Read more.
This paper investigates the effectiveness of a resonance avoidance concept for composite rotor blades featuring extension–twist elastic coupling. The concept uses a tendon, attached to the tip of the blade, to apply a proper amount of compressive force to tune the vibration behavior of the blade actively. The tendon is simulated by applying a non-conservative axial compressive force applied to the blade tip. The main load carrying part of the structure is the composite spar box, which has an antisymmetric layup configuration. The nonlinear dynamic behavior of the composite blade is modelled by using the geometrically exact fully intrinsic beam equations. The resulting nonlinear differential equations are discretized using a time–space scheme, and the stationary and rotating frequencies of the blade are obtained. It is observed that the proposed resonance avoidance mechanism is effective for tuning the vibration behavior of composite blades. The applied compressive force can shift the frequencies and the location at which the frequency veering take place. Furthermore, the compressive force can also cause the composite blade to get unstable depending on the layup ply angle. Finally, the results, highlighting the importance of compressive force and ply angle on the dynamic behavior of composite blades, are presented and discussed. Full article
(This article belongs to the Special Issue Dynamics of Composite Wind Turbine Rotor Blades)
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