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Rainflow Cycle Counting

rgordon
1-Newbie
1-Newbie
‎Mar 30, 2013 11:29 AM
‎Mar 30, 2013 11:29 AM

Rainflow Cycle Counting

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

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10 REPLIES 10
Werner_E
24-Ruby V
24-Ruby V
(To:rgordon)
‎Mar 30, 2013 01:32 PM
‎Mar 30, 2013 01:32 PM

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!?

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VladimirN
24-Ruby II
24-Ruby II
(To:rgordon)
‎Mar 31, 2013 12:12 PM
‎Mar 31, 2013 12:12 PM

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

Rainflow Counting_MC14-15.xmcd.zip
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Werner_E
24-Ruby V
24-Ruby V
(To:VladimirN)
‎Mar 31, 2013 12:20 PM
‎Mar 31, 2013 12:20 PM

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.

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VladimirN
24-Ruby II
24-Ruby II
(To:Werner_E)
‎Mar 31, 2013 12:43 PM
‎Mar 31, 2013 12:43 PM

That is correct. Only the processed data are different.

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Raiko
16-Pearl
16-Pearl
(To:VladimirN)
‎May 06, 2014 04:40 AM
‎May 06, 2014 04:40 AM

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?

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VladimirN
24-Ruby II
24-Ruby II
(To:Raiko)
‎May 06, 2014 05:46 AM
‎May 06, 2014 05:46 AM

Hi Raiko,

Any chance to see your input data?

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Raiko
16-Pearl
16-Pearl
(To:VladimirN)
‎May 06, 2014 05:53 AM
‎May 06, 2014 05:53 AM

Of course, here we go

Raiko

Rainflow Test.xmcd.zip
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Werner_E
24-Ruby V
24-Ruby V
(To:Raiko)
‎May 06, 2014 06:05 AM
‎May 06, 2014 06:05 AM

OK, thats it;-)

Set ORIGIN to 1 and it works.

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

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Werner_E
24-Ruby V
24-Ruby V
(To:Raiko)
‎May 06, 2014 06:04 AM
‎May 06, 2014 06:04 AM

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?

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Raiko
16-Pearl
16-Pearl
(To:Werner_E)
‎May 06, 2014 07:21 AM
‎May 06, 2014 07:21 AM

Hi Werner,

thank you. It's working now!

Raiko

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