t

wetb/fatigue_tools/bearing_damage.py

@@ -4,35 +4,9 @@ Created on 13/10/2014
 @author: MMPE
 '''
 
-def bearing_damage_SWP(angle_moment_lst, m=3, thresshold=0.1):
+def bearing_damage(angle_moment_lst, m=3, thresshold=0.1):
     """Function ported from Matlab.
-
-    Matlab documentation:
-    "Compute bearing damage according to SWP procedure
-    The basic equation is a damage equivalent loading calculated as
-
-    Damage = sum(dPitch*Mr^3.0)
-
-    Where
-    dPitch = pitch change in a given timestep [deg]
-    Mr = load component in a given sector [kNm]
-
-    We evaluate Mr (blade root moment resultant) in 10deg sectors and take
-    the largest damage. For a delta loading as you are investigating it is
-    accurate enough just to take the flap loading and ignore the changes
-    coming from edge load variation.
-
-    The delta pitch is a bit tricky. You need to filter you signal so minor
-    quick variation in pitch does not give an actual delta pitch. The
-    variation in pitch reference is filtered. So effectively a variation
-    below 0.1deg is ignored and the pitch is fixed with no variation as
-    long as the change is below this value.
-
-    So basically for each time step calulate dPitch*Mr^3 and sum it up with
-    Mr=blade flap moment. I’m sure your model will not have the details for
-    capacity comparison, but for changes from one configuration to another
-    should be ok. We do not use the sum(dPitch) for design evaluation directly."
-
+    
     Parameters
     ----------
     angle_moment_lst : ((angle_A_vector, moment_A_vector),(angle_B_vector, moment_B_vector),...)