scholarly journals Implementation of a Biaxial Resonant Fatigue Test Method on a Large Wind Turbine Blade

2014 ◽  
Author(s):  
D. Snowberg ◽  
S. Dana ◽  
S. Hughes ◽  
P. Berling
Keyword(s):  
Wind Turbine ◽  
Fatigue Test ◽  
Turbine Blade ◽  
Wind Turbine Blade ◽  
Test Method ◽  
Large Wind

Study of Fatigue Test Loading Spectrum for Wind Turbine Blade

2014 ◽  
Vol 889-890 ◽  
pp. 221-224
Author(s):  
Gao Hua Liao ◽  
Jian Zhong Wu ◽  
Yong Jun Yu
Keyword(s):  
Wind Speed ◽  
Wind Turbine ◽  
Fatigue Test ◽  
Turbine Blade ◽  
Time History ◽  
Wind Load ◽  
Wind Turbine Blade ◽  
Fatigue Life Analysis ◽  
Test Loading ◽  
Loading Spectrum

According to the principle of equivalent, the approach to draw up the fatigue test loading spectrum of wind turbine blade is presented. Analysis of wind load characteristics, based on ARMA (Autoregressive Moving Average Model) for the simulation of wind speed, wind load simulation example is given. Using Bladed software, the wind speed-time history is converted to a moment-time history that is the equivalent of blade root.Using data compression technology and the rain flow counting algorithm, load represented by a 2D matrix examples is given.The one-dimensional symmetry loading spectrum draw up, the complexity can be simplified, and provides the necessary foundation for fatigue life analysis.

scholarly journals Joint excitation synchronization characteristics of fatigue test for offshore wind turbine blade

AIP Advances ◽  
2018 ◽  
Vol 8 (2) ◽  
pp. 025112 ◽  
Author(s):  
Lei-an Zhang ◽  
Xiang-yong Yu ◽  
Xiu-ting Wei ◽  
Wei-sheng Liu
Keyword(s):  
Wind Turbine ◽  
Fatigue Test ◽  
Turbine Blade ◽  
Wind Turbine Blade ◽  
Offshore Wind ◽  
Offshore Wind Turbine

scholarly journals The Study of Wind Turbine Blade Fatigue Test

2021 ◽  
Vol 293 ◽  
pp. 02024
Author(s):  
Jiaqi Zheng ◽  
Qiming Yu ◽  
Botao Zhu ◽  
Changqing Wu ◽  
Yiling Huang ◽  
...  
Keyword(s):  
Wind Turbine ◽  
Fatigue Test ◽  
Turbine Blade ◽  
Excitation Amplitude ◽  
Wind Turbine Blade ◽  
Excitation Mode ◽  
Practical Operation ◽  
Important Means ◽  
Feasible Solutions ◽  
The Relationship

The fatigue test of wind turbine blade is an important means to verify the fatigue life of wind turbine blade. This paper analyses the problems existing in the fatigue test of wind turbine blade, focuses on the excitation mode, the relationship between excitation amplitude and vibration frequency and the vibration principle, and puts forward feasible solutions in practical operation.

Strength Evaluation of Composites for Large Wind Turbine Blade

2017 ◽  
Vol 2017 (0) ◽  
pp. OS1617
Author(s):  
Ryo UETA ◽  
Ming LUAN ◽  
Takashi HASHIMOTO ◽  
Takahiko SAWADA
Keyword(s):  
Wind Turbine ◽  
Turbine Blade ◽  
Wind Turbine Blade ◽  
Strength Evaluation ◽  
Large Wind

Health assessment and management of wind turbine blade based on the fatigue test data

2017 ◽  
Vol 75 ◽  
pp. 205-214 ◽  
Author(s):  
Xuezong Bai ◽  
Zongwen An ◽  
Yunfeng Hou ◽  
Qiang Ma
Keyword(s):  
Wind Turbine ◽  
Fatigue Test ◽  
Turbine Blade ◽  
Test Data ◽  
Health Assessment ◽  
Wind Turbine Blade

The Effect of Load Phase Angle on Wind Turbine Blade Fatigue Damage

2004 ◽  
Vol 126 (4) ◽  
pp. 1050-1059 ◽  
Author(s):  
Darris L. White ◽  
Walt D. Musial
Keyword(s):  
Finite Element ◽  
Wind Turbine ◽  
Fatigue Test ◽  
Turbine Blade ◽  
Fatigue Damage ◽  
Phase Angle ◽  
Damage Accumulation ◽  
Wind Turbine Blade ◽  
Variable Phase ◽  
Phase Angles

This paper examines the importance of load phase angle variations on fatigue damage and evaluates the potential effects of varying the load phase angle during dual-axis constant amplitude fatigue testing. The scope of this paper is limited to results from simulated wind and dynamic loads. The operating loads on a generic three bladed up-wind 1.5 MW wind turbine blade were analyzed over a range of operating conditions, and an aggregate probability distribution for the actual phase angles between the peak in-plane (lead-lag) and peak out-of-plane (flap) loads was determined. Using a finite element model (FEM) of the 1.5 MW blade and Miner’s Rule [Miner, A., 1945, “Cumulative Damage in Fatigue,” Trans. ASME, 67], the accumulated theoretical fatigue damage (based on axial strains) resulting from a fatigue test with variable phase angles using the aggregate distribution was compared to the damage resulting from a fatigue test with a constant phase angle. The FEM nodal damage distribution at specific blade cross sections were compared for the constant and variable phase angle cases. Single-node stress concentrations were distributed arbitrarily around one cross section to simulate material defects in a blade undergoing testing. Results show that the variable phase angle case results in higher damage on the critical nodes. In addition, the probability of discovering a material defect during a test was substantially increased when variable phase loading was used. The effect of phase angle sequence on the damage accumulation was also considered. For this analysis, the finite element results were processed using a nonlinear damage accumulation model. Results show that the sequence of the phase angle can have a large effect on the fatigue damage, and multiple, shorter length sequences produce higher damage than a single, long term sequence.

Large Wind Turbine Blade Layer Design and Dynamics Characteristics Analysis

2010 ◽  
Vol 29-32 ◽  
pp. 1615-1621
Author(s):  
Xin Wang ◽  
Yu Xiu Xu ◽  
Chuang Ma
Keyword(s):  
Finite Element ◽  
Wind Turbine ◽  
Dynamic Characteristic ◽  
Turbine Blade ◽  
Wind Turbine Blade ◽  
The Finite Element Method ◽  
Optimization Scheme ◽  
Number Of Layers ◽  
Characteristics Analysis ◽  
Large Wind

A 2.5MW wind turbine blade is modeled. The maximum static stress obtaining by the finite element method is compared with the theoretical analysis’s. The results acquired by both of them are same with each other, which validate the rationality of the finite element computational modeling. We find out the weakness regions of the blade by modal analysis on blade. This parper studies the effects of the axial of the fibrous layer, the proportion of axial fiber and the number of layers on the blade dynamic characteristic, respectively, and designs an optimization scheme to improve the blade dynamic characteristic. The research shows that adopting multiaxial, the rational fiber layers' proportion and increasing the layer number can be used to enhance the blade strength; the optimization scheme of the blade layer design in this way can improve the blade dynamic characteristic effectively and apparently.

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