Rain Flow Counting Method

Here you can find the rain flow algorithm for cycle counting.

Description

The rain flow algorithm code has been prepared according to the ASTM standard (Standard practices for cycle counting in fatigue analysis) and optimized considering the calculation time.

• MATLAB release: MATLAB 6.5 (R13)
• Other requirements: compiler for building MEX function
• HTML Files: index.html
• Other Files: rfdemo2.m, ; rfdemo1.m, ; sig2ext.m, ; rainflow.dll, ; rfmatrix.png, ; rfmatrix.jpg, ; rainflow.m, ; rfmatrix.m, ; rfhist.m, ; rainflow.c

[Yu Sang Hui]

This is the program that I want to find

[marc zbo]

helemaal top. Mijn dag is gelijk goed

[Zbo Amigo]

Lang naar gezocht, maar nu heb ik het dankzij ZBO!

[Jim Kay]

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.

[reshu shukla]

i want to know that the information about the counting method

[abdelkader miloudi]

 

[Steve Grobler]

Found teh demo quite informative. Would be helpful if the rainflow results could be arranged in a matrix of cycle counts, with the rows representing the mean, and the columns representing the ranges. Also be helpful if the "leftover" 1/2 cycles could be combined into full cycles and included in the matrix.

[muh alat]

 

[Ole Dossing]

This is a very fine application, not to mention the latest additions. We have used the the rainflow in a stay bridge for fatigue monitoring on critical structures.

[aid abdelkrim]

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

[Tomasz Bednarek]

 

[BB shine]

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

[hh hh]

 

[matt matt]

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

[Joe Quinn]

Dr. Nieslony has developed a Rainflow counting application which we used to validate our impemtation of the ASME standard.  
Once you know that his cycle size is peak and not peak to peak you can adjust (X2) and then it worked 100%.  
Bins boundaries are based on the midpoint between succesive bin midpoints. This caused some juggling to match our method which specifies bin edge directly.  
Otherwise, it was accuarate and easy to modify for graphing and printouts.  
 
I am certain that had I been able to read it the Polish comments would have further added to my understanding of the code.

[Sarah Hughes]

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.

[Vikas Gupta]

This is very best in lot of applications.

[Andy Stevenson]

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.

[gov raj]

good approach

[Matthew Hoehler]

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

[rafiq zulkiffli]

need to show the soft code

[Adam Nieslony]

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

[muhd rafiq zulkiffli]

show the code for rain flow cycle counting

[Muhd rafiq]

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...  
 

[rafiq zulkiffli]

hello,  
i have 1 nonlinear equation with 2 unknowns, can u give the example solution using matlab??..this is my equation is  
(0.003005*Nf^-0.072)+(0.8419*Nf^-0.56654)-((6.571*10^-7)*0.5)=0

[Kerim Genc]

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.

[Carmem Miranda]

I am taking Master course in Brazil. My research is on fatigue. I have difficulties to understand the input data for your program “Rainflow Couting Method”. I need a tutorial to the program and/or an input file example. Can you help me?  
Thanks for attention  

[arif fahruddin]

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

[Achalesh Pandey]

 

[David Outcalt]

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

[Jenyi Liao]

 

[nasri mohamed]

methode de rainflow par matlab

[Philips Adewuyi]

I have been looking for materials that treat the subject of rainflow counting methods for fatigue analysis of structures.

[aid Abdelkrim]

 

[syna gupt]

I used this toolbox but the result seems not correct....

[SENTHILKUMAR C.R]

 

[Félix DORE]

 

[Craig Chang]

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

[santosh a]

 

[Filip R]

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  
 

[Elena Menéndez]

Hello  
 
I have noticed one important difference in the rainflow when compared with the rutine used by the software Bladed. The latter always assigns one full cycle to the range (max-min) of the timeseries. However, your rutine assigns 0.5 cycles to this range. Which one is more accurate?  
Thank you