What does Damage Equivalent Load (DEL) mean?

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Damage Equivalent Load (DEL) is a concept used in structural engineering and fatigue analysis to quantify the impact of cyclic or repetitive loading on materials and structures. It helps in assessing how different loading conditions can lead to similar damage effects over time. In the context of openFAST software, DEL is calculated based on specific parameters, such as frequency and time duration, to evaluate the forces experienced by components like wind turbine blades. Understanding DEL is crucial for predicting structural integrity and lifespan under varying operational conditions. This metric ultimately aids in designing more resilient structures by accounting for fatigue effects.
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Hello all, I am using an open source software called openFAST, and it shows various outputs such as the force along the x axis as the blade rotates around.

I then use a python script that uses the following equation:
del.PNG

where:
neq.PNG


and feq = 2.1Hrz for my example and T is 60 seconds

This is what is called Damage Equivalent Load, but im not sure what that actually means? Equivalent to what? What exactly is DEL? is it based off of cycles or something?
thanks
 

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