Rainflow Cycle Counting

rgordon · ‎Mar 30, 2013

Does anyone have a Mathcad Prime script for rainflow cycle counting for fatigue analysis that they would be willing to share or can anyone point me to an existing respource. I have several spectra I need to convert into stress histograms. The spectra each have more than 20,000 lines of data

Werner_E · ‎Mar 30, 2013

Did you try to search this forum for "rainflow". There seem to be some hits - http://communities.ptc.com/message/92957#92957.

BTW, I just noticed you had a question two month ago. Ther were some replies but no reaction from your part!?

VladimirN · ‎Mar 31, 2013

Hi,

Please find in attachment "Rainflow Counting" worksheet from the "DynamAssist (Structural Dynamics Toolbox)" e-book for Mathcad, which is available here: http://www.dynamassist.com/ . Another useful discussion: http://communities.ptc.com/thread/19166

Werner_E · ‎Mar 31, 2013

VladimirN. wrote:
Hi,
Please find in attachment "Rainflow Counting" worksheet from the "DynamAssist (Structural Dynamics Toolbox)" e-book for Mathcad,

This file of Ian Ward is one of the two files from the thread I posted.

VladimirN · ‎Mar 31, 2013

That is correct. Only the processed data are different.

Raiko · ‎May 06, 2014

Hello Vladimir,

I keep getting error messages when using the MC14-MC15 Rainflow Counting function.

I'm using MC15 on a Win 7 machine and the error message reads "This array index is invalid for this array".

My vector has 9500 elements.

Any ideas?

Raiko

P.S.

The function is set to 100 bins. When and for what puropose should these bins be changed?

VladimirN · ‎May 06, 2014

Hi Raiko,

Any chance to see your input data?

Raiko · ‎May 06, 2014

Of course, here we go

Raiko

Werner_E · ‎May 06, 2014

OK, thats it;-)

Set ORIGIN to 1 and it works.

When writing my last post I hadn't seen the sheet you sent.

Werner_E · ‎May 06, 2014

when using the MC14-MC15 Rainflow Counting function.
I'm using MC15 on a Win 7 machine and the error message reads "This array index is invalid for this array".
My vector has 9500 elements.
Any ideas?

Hard without seeing anything. The original was created with ORIGIN=1 in mind (its set in the "range function" area. Did you consider this?

Raiko · ‎May 06, 2014

Hi Werner,

thank you. It's working now!

Raiko