Rapid optimization of stall-regulated wind turbine blades using a frequency-domain method: Part 2, cost function selection and results

Wind Energy ◽  
2014 ◽  
Vol 18 (6) ◽  
pp. 955-977 ◽  
Author(s):  
Karl O. Merz
Keyword(s):  
Cost Function ◽  
Wind Turbine ◽  
Frequency Domain ◽  
Turbine Blades ◽  
Frequency Domain Method ◽  
Wind Turbine Blades ◽  
Domain Method ◽  
Function Selection

Frequency Domain Analysis of the Fatigue Loads on Typical Wind Turbine Blades

1996 ◽  
Vol 118 (4) ◽  
pp. 204-211 ◽  
Author(s):  
H. J. Sutherland
Keyword(s):  
Time Series ◽  
Wind Turbine ◽  
Frequency Domain ◽  
Turbine Blades ◽  
Large Body ◽  
Fatigue Analysis ◽  
Series Data ◽  
Wind Turbine Blades ◽  
Analysis Techniques ◽  
Fatigue Loads

The fatigue analysis of a wind turbine blade typically depends on converting time-series data to a series of load cycles using one of several cyclic counting algorithms. However, many structural analysis techniques yield frequency-domain stress spectra, and a large body of experimental loads (stress) data is reported in the frequency domain. To permit the fatigue analysis of this class of data, a series of computational algorithms based on Fourier analysis techniques has been developed. The principle underlying these algorithms is the use of an Inverse Fast Fourier Transform (FFT) to transform the frequency spectrum to an equivalent time series suitable for cycle counting. In addition to analyzing the fatigue loads along the primary blade axes, this analysis technique also permits the examination of “off-axis” bending loads. These algorithms, which have been incorporated in the LIFE2 fatigue analysis code for wind turbines, are illustrated and evaluated with data from typical wind turbine blades.

Frequency Versus Time Domain Fatigue Analysis of a Semi-Submersible Wind Turbine Tower

2014 ◽  
Author(s):  
Marit I. Kvittem ◽  
Torgeir Moan
Keyword(s):  
Wind Turbine ◽  
Frequency Domain ◽  
Fatigue Damage ◽  
Time Domain ◽  
Linear Time ◽  
Frequency Domain Method ◽  
Good Representation ◽  
Bending Moments ◽  
Flexible Mode ◽  
Domain Method

The current paper addresses a study of a semi-submersible wind turbine, where tower base bending moments and short term tower fatigue damage was estimated by a frequency domain method assuming two-dimensional platform motions. Both a rigid structure assumption and a generalised degree of freedom model for including the first flexible mode of the turbine were investigated. First, response wind- and wave loads were considered separately, then superposition was used to find the response to combined wind and wave loading. The bending moments and fatigue damage obtained by these methods were compared to results from a fully coupled, non-linear time domain analyses. In this study a three column, catenary moored semi-submersible with the NREL 5MW turbine mounted on one of the columns was modelled. The time domain simulation tool used was Simo-Riflex-AeroDyn from Marintek and CeSOS. The frequency domain method accounting for a flexible turbine gave a good representation of the tower base bending moment histories for the moderate sea states in these analyses, also for the combined wind and wave analyses. The frequency domain fatigue damage predictions were underestimated by 0–60%, most likely due to the exponential relationship between damage and stress amplitude.

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

Lightning Striking Characteristics to Wind Turbine Blades -Experimental Study of Effects of the Receptor Configuration and Other Parameters-

2009 ◽  
Vol 129 (2) ◽  
pp. 331-339
Author(s):  
Takatoshi Shindo ◽  
Akira Asakawa ◽  
Megumu Miki
Keyword(s):  
Experimental Study ◽  
Wind Turbine ◽  
Turbine Blades ◽  
Wind Turbine Blades

The Surface Damage Identifications of Wind Turbine Blades Based on ResNet50 Algorithm

2020 ◽  
Author(s):  
Peng Yang ◽  
Chaoyi Dong ◽  
Xiaoyi Zhao ◽  
Xiaoyan Chen
Keyword(s):  
Wind Turbine ◽  
Turbine Blades ◽  
Surface Damage ◽  
Wind Turbine Blades

Folding of flexible hinges for aircraft wingtips and wind turbine blades

2021 ◽  
Author(s):  
Aileen G. Bowen Perez ◽  
Giovanni Zucco ◽  
Paul Weaver
Keyword(s):  
Wind Turbine ◽  
Turbine Blades ◽  
Wind Turbine Blades

Evaluation of the influence of wind speed and angle of attack on the aerodynamic effect of wind turbine blades

2017 ◽  
Author(s):  
Salete Alves ◽  
Luiz Guilherme Vieira Meira de Souza ◽  
Edália Azevedo de Faria ◽  
Maria Thereza dos Santos Silva ◽  
Ranaildo Silva
Keyword(s):  
Wind Speed ◽  
Wind Turbine ◽  
Turbine Blades ◽  
Angle Of Attack ◽  
Wind Turbine Blades ◽  
Aerodynamic Effect
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