Comments and Ratings

I have temperature data over time and derive a fatigue model. Using this rainflow counting, I want to get data with three parameters, which are Max_termperature, each cycle time, amplitude (max-min). Is anyone knowing if this package can provide this kind of data? I appreciate.

I found out that my first error came from a conflict caused by a similar filename and function name (Rainflow.m/rainflow) But now my error is:
??? Undefined function or method 'rainflow' for input arguments of type
'double'.

Error in ==> testinterpolasjon at 19
rf = rainflow(ext,exttime);

I'm running Matlab release 2009a

very good

Hello
Does anyone know how to get output data from rfdemo1? Because i noticed that rainflow.m is not accurate with larger amount of data. Thank you

great tool. Detail doc, easy to use. Excelent.

methode de rainflow par matlab

Do you have a commented version of the C code? I find it difficult to follow.

I'm master student, my thesis about fatigue in variable amplitude, random loaing. Have you a solution. Thank You

Excellent code, very useful. I validated and understood it through trials with small data sets before moving onto huge force-time curves. Make sure that you understand that amplitude is in terms of a sinusoid, therefore the magnitude of the peaks are actually twice the amplitude indicated. Also, Half cycles can be a bit confusing at first, since this is not a "closed loop" rainflow counting method, you just have to combine the half cycles.

thanks for the advice..but im still got problem coding in Matlab, because i cannot get the peak and valley reversal first..my data length is 32000 and sampling frequency is 200...can u give me some idea...
 

Hi Rafiq Zulkiffli,

Some years ago I wrote the rainflow function in MATLAB Script (m-file). Unfortunately the function worked very, very slow, because many iterations in the rainflow algorithm appears. So, I decide to create mex function where the time consuming iterations realized faster. Be sure, with ?the soft code? you cant count the cycles in sensible time. Look on the ?rainflow.c? file and try to understand the C code lines.

Best regards, Adam Nieslony

A very useful tool! It is fast, robust and did just what I needed; no more, no less.

This is an excellent tool. I made a couple of short example problems to understand the output and once I did that I'm using the program at work. The rfdemo2 code is especially cool for showing others how rainflow counting works.

Functionally this program is excellent, and produces results that are consistent with the ASTM standard. As with other users, it took me a while to realise that amplitude means amplitude and not range, but that's my fault for not reading it properly. I would appreciate some more explanation of the meaning of the half-cycles which I haven't encountered in other software, as I'm not sure how best to process these.

Once the entry vector is too large, it doesn't work. Who can help me?

This program is perfect to me... thanks..

- the version matlab does not go
- I need the module mex.h
 
 

Program works well; does not produce histograms, you need to extract these yourself (watch out for half-cylcles).
Checked against "Simple rainflow counting algorithms" (1 pass methdo), Downing and Socie; got the same results.

helemaal top. Mijn dag is gelijk goed