Description:
rfcnt 0.4.6
rfcnt a rainflow counting algorithm Python package
"Rainflow Counting" consists of four main steps:
Hysteresis Filtering
Peak-Valley Filtering
Discretization
Four Point Counting Method:
* D
/ \ Closed, if min(B,C) >= min(A,D) && max(B,C) <= max(A,D)
B *<--/ Slope B-C is counted and removed from residue
/ \ /
/ * C
\ /
* A
These steps are fully documented in standards such as
ASTM E1049 "Standard Practices for Cycle Counting in Fatigue Analysis" [1]
This implementation uses the 4-point algorithm mentioned in [3,4] and the 3-point HCM method proposed in [2] as well as the ASTM E 1049 (2011) standard in [1].
To take the residue into account, you may implement a custom method or use some
predefined functions.
Install
pip install {packagename}.tar.gz --no-build-isolation --no-deps
where {packagename} is the current package release, for example:
pip install rfcnt-0.4.6.tar.gz --no-build-isolation --no-deps
Test
rfcnt packages include some unit tests, which can be run:
python -m rfcnt.run_tests
Examples
For a quick introduction you can run and inspect a small example:
python -m rfcnt.run_examples
References:
[1] "Standard Practices for Cycle Counting in Fatigue Analysis."
ASTM Standard E 1049, 1985 (2011).
West Conshohocken, PA: ASTM International, 2011.
[2] "Rainflow - HCM / Ein Hysteresisschleifen-Zaehlalgorithmus auf werkstoffmechanischer Grundlage"
U.H. Clormann, T. Seeger
1985 TU Darmstadt, Fachgebiet Werkstoffmechanik
[3] "Zaehlverfahren zur Bildung von Kollektiven und Matrizen aus Zeitfunktionen"
FVA-Richtlinie, 2010.
[https://fva-net.de/fileadmin/content/Richtlinien/FVA-Richtlinie_Zaehlverfahren_2010.pdf]
[4] Siemens Product Lifecycle Management Software Inc., 2018.
[https://community.plm.automation.siemens.com/t5/Testing-Knowledge-Base/Rainflow-Counting/ta-p/383093]
License
For personal and professional use. You cannot resell or redistribute these repositories in their original state.
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