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1、 RAINFLOW cycle counting.% RAINFLOW counting function allows you to extract % cycle from random loading.% SYNTAX% rf = RAINFLOW(ext)% rf = RAINFLOW(ext, dt)% rf = RAINFLOW(ext, extt)% OUTPUT% rf - rainflow cycles: matrix 3xn or 5xn dependend on input,% rf(1,:) Cycles amplitude,% rf(2,:) Cycles mean 。

2、value,% rf(3,:) Number of cycles (0.5 or 1.0),% rf(4,:) Begining time (when input includes dt or extt data),% rf(5,:) Cycle period (when input includes dt or extt data),% INPUT% ext - signal points, vector nx1, ONLY TURNING POINTS!,% dt - sampling time, positive number, when the turning points% spac。

3、ed equally,% extt - signal time, vector nx1, exact time of occurrence of turning points.% See also SIG2EXT, RFHIST, RFMATRIX, RFPDF3D.% RAINFLOW% Copyright (c) 1999-2002 by Adam Nieslony,% MEX function.function rfdemo1(ext)% function rfdemo1(ext)% RFDEMO1 shows cycles extracted from signal% using ra。

4、inflow algoritm.% % INPUT: ext - option, number or vectors with turning% points or time history. Default ext=16.% % OUTPUT: no enable.% % SYNTAX:% rfdemo1% rfdemo1(10)% rfdemo1(2 3 2 4 2 5 1 6)% By Adam Nies硂ny% Revised, 10-Nov-2009% Visit the MATLAB Central File Exchange for latest version.error(na。

5、rgchk(0,2,nargin)if nargin=0,% turning points from 16 random numbersext=sig2ext(randn(4);elseif length(ext(:)=1,% turning points from n random numbers ext=sig2ext(randn(1,ext);else% turning points from vector extext=sig2ext(ext);enda=rainflow(ext,1);m n=size(a);% if n100,% button = questdlg(Rainflow。

6、 found num2str(sum(a(3,:) cycles! Do you want to continue?,.% Continue Operation,Yes,No,No);% if strcmp(button,No)% error(Function aborted by user.) % end% endcol=ymcrgb;plot(0:length(ext)-1,ext,k.:)hold onwyk=0:0.05:1;for c=1:n,colnr=rem(c-1,6)+1;nr1=round(a(4,c)+1);nr2=round(a(4,c)+1+a(5,c)*a(3,c)。

7、;if a(3,c)=1.0,if ext(nr1)ext(nr2),plot(wyk.*a(5,c)*0.5+a(4,c),cos( wyk.*pi)*a(1,c)+a(2,c),col(colnr)text(a(4,c),a(2,c)+a(1,c),int2str(c) . Half-cycle, down,.Color,col(colnr),VerticalAlignment,bottom)elseplot(wyk.*a(5,c)*0.5+a(4,c),cos(pi+wyk.*pi)*a(1,c)+a(2,c),col(colnr)text(a(4,c),a(2,c)-a(1,c),in。

8、t2str(c) . Half-cycle, up,.Color,col(colnr),VerticalAlignment,top)endendendxlabel(peaks, counted from 0)ylabel(value)title(Rainflow cycles extracted from signal)legend(peaks from signal,0)hold offdisp(Row 1: amplitude)disp(Row 2: mean)disp(Row 3: number of cycles (cycle or half cycle)disp(Row 4: begin time of extracted cycle or half cycle)disp(Row 5: period of a cycle) disp(a。