Abstract
The fatigue life of MW wind turbine blade was assessed by applying theoretical calculation and test verification. Firstly, the fatigue characteristic curve of FRP material was obtained based on Palmgren-Miner damage theory. Furthermore, The fatigue life of Aeroblade1.5-40.3 wind turbine blade using multistage loading accumulative damage theory could be evaluated over 20 years accordingly. Then the coordinate system of wind turbine blade and its Bladed simulation model were set. By calculating fatigue loading, the moment distribution of fatigue test was obtained. Finally, the blade’s fatigue loading system driven by an eccentric mass was built and the multi-level amplitude resonant mode was adopted to carry on the test. Almost three months’ test results showed that the blade vibrating amplitude was constant, which illustrate the little variation of stiffness of loading point. The stable of stiffness could testify the fatigue life of blade was over 20 years. The results of in-site experiment were basically consistent with the theoretical calculation.
Highlights
As one of the key components of wind turbines [1], the blades are affected by the combination of the external environment during operation
Researching shows that the life of wind turbine blades is largely dependent on its fatigue life [7,8,9], and fatigue life is determined by the mechanical properties and the size of the force
In order to obtain the effect of fatigue damage quantitatively, fatigue failure under a certain-level loading di was defined as: di where, di —fatigue failure under a certain-level loading; Ni—max cycles of fatigue damage under a certain-level loading
Summary
As one of the key components of wind turbines [1], the blades are affected by the combination of the external environment during operation. When the load exceeds the blade’s fatigue limit, the fatigue failure of material occurs. Researching shows that the life of wind turbine blades is largely dependent on its fatigue life [7,8,9], and fatigue life is determined by the mechanical properties and the size of the force. Because of the complexity of loading, the life assessment of wind turbine blade involves many uncertainties. The loading multistage accumulative damage theory was adopted to evaluate fatigue life of Aeroblade1.5-40.3 wind blade. The in-site result showed the fatigue life of the blade obtained from theoretical calculating was accurate
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