matlab_小波包分解_应用于机械振动信号的故障分析

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