From d039b7afb933b5bd8a4d427d9f47f901194b58d0 Mon Sep 17 00:00:00 2001
From: madsmpedersen <m@madsp.dk>
Date: Mon, 9 Nov 2015 09:58:00 +0100
Subject: [PATCH] t
---
wetb/fatigue_tools/bearing_damage.py | 30 ++--------------------------
1 file changed, 2 insertions(+), 28 deletions(-)
diff --git a/wetb/fatigue_tools/bearing_damage.py b/wetb/fatigue_tools/bearing_damage.py
index 145def9..62b99d4 100644
--- a/wetb/fatigue_tools/bearing_damage.py
+++ b/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),...)
--
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