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<H1 class=ContentTitle><STRONG>小波包變換分析信號的MATLAB程序</STRONG></H1>
<H2 class=ContentAuthor>作者:dinga 日期:2007-05-12</H2></DIV>
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<DIV 
class=UBBContent>%t=0.001:0.001:1;<BR>t=1:1000;<BR>s1=sin(2*pi*50*t*0.001)+sin(2*pi*120*t*0.001)+rand(1,length(t));<BR><BR>for&nbsp;t=1:500;<BR>s2(t)=sin(2*pi*50*t*0.001)+sin(2*pi*120*t*0.001)+rand(1,length(t));<BR>end<BR><BR>for&nbsp;t=501:1000;<BR>s2(t)=sin(2*pi*200*t*0.001)+sin(2*pi*120*t*0.001)+rand(1,length(t));<BR>end<BR><BR><BR>subplot(9,2,1)<BR>plot(s1)<BR>title('原始信號')<BR>ylabel('S1')<BR><BR>subplot(9,2,2)<BR>plot(s2)<BR>title('故障信號')<BR>ylabel('S2')<BR><BR>wpt=wpdec(s1,3,'db1','shannon');<BR><BR>%plot(wpt);<BR>s130=wprcoef(wpt,[3,0]);<BR>s131=wprcoef(wpt,[3,1]);<BR>s132=wprcoef(wpt,[3,2]);<BR>s133=wprcoef(wpt,[3,3]);<BR>s134=wprcoef(wpt,[3,4]);<BR>s135=wprcoef(wpt,[3,5]);<BR>s136=wprcoef(wpt,[3,6]);<BR>s137=wprcoef(wpt,[3,7]);<BR>s10=norm(s130);<BR>s11=norm(s131);<BR>s12=norm(s132);<BR>s13=norm(s133);<BR>s14=norm(s134);<BR>s15=norm(s135);<BR>s16=norm(s136);<BR>s17=norm(s137);<BR><BR>st10=std(s130);<BR>st11=std(s131);<BR>st12=std(s132);<BR>st13=std(s133);<BR>st14=std(s134);<BR>st15=std(s135);<BR>st16=std(s136);<BR>st17=std(s137);<BR><BR>disp('正常信號的特征向量');<BR>snorm1=[s10,s11,s12,s13,s14,s15,s16,s17]<BR>std1=[st10,st11,st12,st13,st14,st15,st16,st17]<BR><BR>subplot(9,2,3);plot(s130);<BR>ylabel('S130');<BR>subplot(9,2,5);plot(s131);<BR>ylabel('S131');<BR>subplot(9,2,7);plot(s132);<BR>ylabel('S132');<BR>subplot(9,2,9);plot(s133);<BR>ylabel('S133');<BR>subplot(9,2,11);plot(s134);<BR>ylabel('S134');<BR>subplot(9,2,13);plot(s135);<BR>ylabel('S135');<BR>subplot(9,2,15);plot(s136);<BR>ylabel('S136');<BR>subplot(9,2,17);plot(s137);<BR>ylabel('S137');<BR><BR><BR>wpt=wpdec(s2,3,'db1','shannon');<BR><BR>%plot(wpt);<BR>s230=wprcoef(wpt,[3,0]);<BR>s231=wprcoef(wpt,[3,1]);<BR>s232=wprcoef(wpt,[3,2]);<BR>s233=wprcoef(wpt,[3,3]);<BR>s234=wprcoef(wpt,[3,4]);<BR>s235=wprcoef(wpt,[3,5]);<BR>s236=wprcoef(wpt,[3,6]);<BR>s237=wprcoef(wpt,[3,7]);<BR><BR>s20=norm(s230);<BR>s21=norm(s231);<BR>s22=norm(s232);<BR>s23=norm(s233);<BR>s24=norm(s234);<BR>s25=norm(s235);<BR>s26=norm(s236);<BR>s27=norm(s237);<BR><BR>st20=std(s230);<BR>st21=std(s231);<BR>st22=std(s232);<BR>st23=std(s233);<BR>st24=std(s234);<BR>st25=std(s235);<BR>st26=std(s236);<BR>st27=std(s237);<BR><BR>disp('故障信號的特征向量');<BR>snorm2=[s20,s21,s22,s23,s24,s25,s26,s27]<BR>std2=[st20,st21,st22,st23,st24,st25,st26,st27]<BR><BR><BR>subplot(9,2,4);plot(s230);<BR>ylabel('S230');<BR>subplot(9,2,6);plot(s231);<BR>ylabel('S231');<BR>subplot(9,2,8);plot(s232);<BR>ylabel('S232');<BR>subplot(9,2,10);plot(s233);<BR>ylabel('S233');<BR>subplot(9,2,12);plot(s234);<BR>ylabel('S234');<BR>subplot(9,2,14);plot(s235);<BR>ylabel('S235');<BR>subplot(9,2,16);plot(s236);<BR>ylabel('S236');<BR>subplot(9,2,18);plot(s237);<BR>ylabel('S237');<BR><BR>%fft<BR><BR>figure<BR>y1=fft(s1,1024);<BR>py1=y1.*conj(y1)/1024;<BR>y2=fft(s2,1024);<BR>py2=y2.*conj(y2)/1024;<BR><BR>y130=fft(s130,1024);<BR>py130=y130.*conj(y130)/1024;<BR>y131=fft(s131,1024);<BR>py131=y131.*conj(y131)/1024;<BR>y132=fft(s132,1024);<BR>py132=y132.*conj(y132)/1024;<BR>y133=fft(s133,1024);<BR>py133=y133.*conj(y133)/1024;<BR>y134=fft(s134,1024);<BR>py134=y134.*conj(y134)/1024;<BR>y135=fft(s135,1024);<BR>py135=y135.*conj(y135)/1024;<BR>y136=fft(s136,1024);<BR>py136=y136.*conj(y136)/1024;<BR>y137=fft(s137,1024);<BR>py137=y137.*conj(y137)/1024;<BR><BR>y230=fft(s230,1024);<BR>py230=y230.*conj(y230)/1024;<BR>y231=fft(s231,1024);<BR>py231=y231.*conj(y231)/1024;<BR>y232=fft(s232,1024);<BR>py232=y232.*conj(y232)/1024;<BR>y233=fft(s233,1024);<BR>py233=y233.*conj(y233)/1024;<BR>y234=fft(s234,1024);<BR>py234=y234.*conj(y234)/1024;<BR>y235=fft(s235,1024);<BR>py235=y235.*conj(y235)/1024;<BR>y236=fft(s236,1024);<BR>py236=y236.*conj(y236)/1024;<BR>y237=fft(s237,1024);<BR>py237=y237.*conj(y237)/1024;<BR><BR>f=1000*(0:511)/1024;<BR>subplot(1,2,1);<BR>plot(f,py1(1:512));<BR>ylabel('P1');<BR>title('原始信號的功率譜')<BR>subplot(1,2,2);<BR>plot(f,py2(1:512));<BR>ylabel('P2');<BR>title('故障信號的功率譜')<BR><BR>figure<BR><BR>subplot(4,2,1);<BR>plot(f,py130(1:512));<BR>ylabel('P130');<BR>title('S130的功率譜')<BR>subplot(4,2,2);<BR>plot(f,py131(1:512));<BR>ylabel('P131');<BR>title('S131的功率譜')<BR>subplot(4,2,3);<BR>plot(f,py132(1:512));<BR>ylabel('P132');<BR>subplot(4,2,4);<BR>plot(f,py133(1:512));<BR>ylabel('P133');<BR>subplot(4,2,5);<BR>plot(f,py134(1:512));<BR>ylabel('P134');<BR>subplot(4,2,6);<BR>plot(f,py135(1:512));<BR>ylabel('P135');<BR>subplot(4,2,7);<BR>plot(f,py136(1:512));<BR>ylabel('P136');<BR>subplot(4,2,8);<BR>plot(f,py137(1:512));<BR>ylabel('P137');<BR>figure<BR><BR>subplot(4,2,1);<BR>plot(f,py230(1:512));<BR>ylabel('P230');<BR>title('S230的功率譜')<BR>subplot(4,2,2);<BR>plot(f,py231(1:512));<BR>ylabel('P231');<BR>title('S231的功率譜')<BR>subplot(4,2,3);<BR>plot(f,py232(1:512));<BR>ylabel('P232');<BR>subplot(4,2,4);<BR>plot(f,py233(1:512));<BR>ylabel('P233');<BR>subplot(4,2,5);<BR>plot(f,py234(1:512));<BR>ylabel('P234');<BR>subplot(4,2,6);<BR>plot(f,py235(1:512));<BR>ylabel('P235');<BR>subplot(4,2,7);<BR>plot(f,py236(1:512));<BR>ylabel('P236');<BR>subplot(4,2,8);<BR>plot(f,py237(1:512));<BR>ylabel('P237');<BR>figure<BR>%plottree(wpt)</DIV></DIV><BR><BR></DIV>
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