A parametric study of coupled-mode flutter for MW-size wind turbine blades

Wind Energy ◽  
2015 ◽  
Vol 19 (3) ◽  
pp. 497-514 ◽  
Author(s):  
Pariya Pourazarm ◽  
Yahya Modarres-Sadeghi ◽  
Matthew Lackner
Keyword(s):  
Wind Turbine ◽  
Parametric Study ◽  
Turbine Blades ◽  
Wind Turbine Blades ◽  
Coupled Mode

Relating Turbulence to Wind Turbine Blade Loads: Parametric Study with Multiple Regression Analysis

1999 ◽  
Vol 121 (3) ◽  
pp. 156-161 ◽  
Author(s):  
T. Kashef ◽  
S. R. Winterstein
Keyword(s):  
Regression Analysis ◽  
Wind Turbine ◽  
Parametric Study ◽  
Turbine Blades ◽  
Low Frequency ◽  
Frequency Content ◽  
Wind Turbine Blades ◽  
Systematic Method ◽  
Highly Correlated ◽  
Blade Loads

Different wind parameters are studied to find a set that is most useful in estimating fatigue loads on wind turbine blades. The histograms of rainflow counted stress ranges are summarized through their first three statistical moments and regression analysis is used to estimate these moments in various wind conditions. A systematic method of comparing the ability of different wind parameters to estimate the moments is described and results are shown for flapwise loads on three HAWTs. In the case of two of these turbines, the stress ranges are shown to be highly correlated with a turbulence measure obtained by removing a portion of the low-frequency content of the wind.

A Study on Coupled Bending and Torsional Vibrations of Wind Turbine Blades

2012 ◽  
Vol 622-623 ◽  
pp. 1236-1242 ◽  
Author(s):  
Mary V. Bastawrous ◽  
Ayman A. El-Badawy
Keyword(s):  
Wind Turbine ◽  
Parametric Study ◽  
Turbine Blades ◽  
Vibration Modes ◽  
Blade Design ◽  
Wind Turbine Blades ◽  
Analysis Techniques ◽  
Material Stiffness ◽  
Dimensional Parameters ◽  
Collective Influence

A parametric study is developed to investigate the effect of geometry, material stiffness and the rotational motion on the coupled flapwise bending and torsional vibration modes of a wind turbine blade. The assumed modes method is used to discretize the derived kinetic and potential energy terms. Lagrange’s equations are used to derive the modal equations from the discretized terms, which are solved for the vibration frequencies. The parametric study utilizes dimensional analysis techniques to study the collective influence of the investigated parameters by combining them into few non-dimensional parameters, thus providing deeper insight to the physics of the dynamic response. Results would be useful in providing rules and guidelines to be used in blade design.

scholarly journals Minimum Leading Edge Protection Application Length to Combat Rain-Induced Erosion of Wind Turbine Blades

Energies ◽  
2021 ◽  
Vol 14 (6) ◽  
pp. 1629
Author(s):  
Amrit Shankar Verma ◽  
Sandro Di Noi ◽  
Zhengru Ren ◽  
Zhiyu Jiang ◽  
Julie J. E. Teuwen
Keyword(s):  
Wind Turbine ◽  
Parametric Study ◽  
Turbine Blades ◽  
Leading Edge ◽  
Spanwise Direction ◽  
Probabilistic Framework ◽  
Wind Turbine Blades ◽  
Rule Of Thumb ◽  
Higher Power

Leading edge erosion (LEE) repairs of wind turbine blades (WTBs) involve infield application of leading edge protection (LEP) solutions. The industry is currently aiming to use factory based LEP coatings that can applied to the WTBs before they are shipped out for installation. However, one of the main challenges related to these solutions is the choice of a minimum LEP application length to be applied in the spanwise direction of the WTBs. Generally, coating suppliers apply 10–20 m of LEP onto the blades starting from the tip of the blade using the “rule of thumb”, and no studies in the literature exist that stipulate how these LEP lengths can be calculated. In this study, we extend the scope of a recently developed long-term probabilistic framework to determine the minimum LEP application length required for WTBs to combat rain-induced erosion. A parametric study is performed where different wind turbines with varying power ratings of 2.1 MW to 15 MW at different Dutch sites ranging from inland to coastal are considered. The results of the study show that the LEP application length is sensitive to the choice of the site, as well as the turbine attributes. Further, LEP lengths for WTBs are found to be the highest for turbines installed at coastal sites and turbines with higher power ratings. A detailed investigation is further performed to check the sensitivity of the LEP application length with the wind turbine parameters. The results of the study are expected to provide guidelines to the industry for efficient repair strategies for WTBs.

Experiments of Wind Turbine Blades with Rocket Triggered Lightning

2009 ◽  
Vol 129 (5) ◽  
pp. 689-695
Author(s):  
Masayuki Minowa ◽  
Shinichi Sumi ◽  
Masayasu Minami ◽  
Kenji Horii
Keyword(s):  
Wind Turbine ◽  
Turbine Blades ◽  
Wind Turbine Blades ◽  
Triggered Lightning
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