Conversely, designing blades to allow them to deform slightly may reduce localised stress and therefore prolong the life of the blades and allow the blades to deform in to their optimum operational state.
The predicted fatigue life of the blade is shown to be in good agreement with discrete life modelling results.
And based on the proposed model the fatigue life of WT blade can be estimated more trustworthily and reliably.
Edgewise vibrations in wind turbine blades are lightly damped, and large amplitude vibrations induced by the turbulence may significantly shorten the fatigue life of the blade.
The probabilistic sensitivity analyses demonstrate that the fatigue performance parameters hold important influence on the low-cycle fatigue life of turbine blade.
A combined high and low cycle fatigue life prediction model for nickel-base single crystal (SC) has been presented to analyze the low cycle fatigue (LCF) and high cycle fatigue (HCF) life of SC blade.
These accumulation rates, together with the statistics of rainfall history, provide a means for estimating the expected fatigue life of the blade coating as an indication of the onset of surface roughening or the end of the incubation period.
In the paper the lower order statistical moments of the fatigue life of a blade are estimated and compared for a turbine with a tripod tower and a standard mono-tower, respectively.
The fatigue life of a blade that has to endure for more than 20 years was estimated by using the well-known S N linear damage theory, the service load spectrum, and the Spera's empirical equations.
