FlexPro 6 – RainFlow Counting Procedure

[Brad Burkholder]

We recently purchased the counting procedure add-on for Flexpro 6. I have tried to produce the attached picture results. Top left corner is the graph from Flexpro. Right side is a practical rainflow analysis (from a technical write up). Bottom left is the outcome of the data (from a technical write up). Can someone please explain how to use the rainflow count? I found out that Flexpro 8 automatically insert the Count matrix where as FP6 you have to do it manually. Is there more technical referance books other than the FP Help…?

[Brad Burkholder]

We recently purchased the counting procedure add-on for Flexpro 6. I have tried to produce the attached picture results. Top left corner is the graph from Flexpro. Right side is a practical rainflow analysis (from a technical write up). Bottom left is the outcome of the data (from a technical write up). Can someone please explain how to use the rainflow count? I found out that Flexpro 8 automatically insert the Count matrix where as FP6 you have to do it manually. Is there more technical referance books other than the FP Help…?

[Bernhard Kantz]

Technical references for Counting Procedures Option are:
[1] DIN 45667 (1970). Klassierverfahren für das Erfassen regelloser Schwingungen (Counting procedures for determining random oscillations). Beuth Verlag
[2] de Jonge, J.B. (1980). Counting Methods for the Analysis of Load Time Histories. NLR Memorandum SB-80-106 U
[3] Fraunhofer-Institut für Betriebsfestigkeit LBF (Fraunhofer-Institute for Structural Durability LBF), Darmstadt. Hinweise zur Anwendung von Zählverfahren im Rahmen von Betriebsfestigkeitsuntersuchungen (Tips on using counting procedures as part of structural durability testing). http://www.simtop.fhg.de/cgi-bin/rmcat?1000kl03

New features in FlexPro8
The Rainflow matrix can now also be calculated in asymmetric form.
You can exclude the residue from the matrix, include a closed hysteresis “a-b-a” in the center of the residue only, or fully include the residue into the matrix.
If you create a Rainflow Count directly for a data set, then FlexPro 8 automatically creates the required Count Matrix analysis object as an intermediate step.

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