发布时间 : 星期日 文章汽车理论matlab作业更新完毕开始阅读f6ae79bb960590c69ec3768f
gtext('Law1')
ylabel('加权振级') xlabel('座椅fs1/HZ') subplot(2,2,3) plot(gs2,awb) gtext('aw2')
ylabel('人体加权加速度均方根值') xlabel('座椅gs2')
subplot(2,2,4) plot(gs2,Law2) ylabel('加权振级') xlabel('座椅gs2') gtext('Law2')
所以人体加权加速度均方根值和加权振级随fs1的增大而增大
人体加权加速度均方根值和加权振级随gs1的增大而减小
3）f01=linspace(0.25,3,100)
for i=1:100
f0=1.5;g=0.25;r=9;u=10;fs=3;gs=0.25;v=20;Gqn0=2.56*10^(-8);n0=0.1;
df=0.2;N=180; f=0.000001:0.2:36; ff0=f/f01(i); ffs1=f/fs; w=2*pi*f;
d=((1-ff0.^2).*(1+r-ff0.^2/u)-1).^2+4.*g^2.*ff0.^2.*(r-(1/u+1).*ff0.^2).^2; z1q=r*sqrt(((1-ff0.^2).^2+4*g^2*ff0.^2)./d);
z2z1=sqrt((1+(2*g*ff0).^2)./((1-ff0.^2).^2+(2*g*ff0).^2)); pz2=sqrt((1+(2*gs*ffs1).^2)./((1-ffs1.^2).^2+(2*gs*ffs1).^2));
ez2(i)=sqrt(sum(z2z1.^2.*z1q.^2.*4.*pi^2.*Gqn0.*v*n0^2*n0^2*df)) FdG=(r.*w/9.8).^2.*((ff0.^2./(1+u)-1).^2+4*g^2.*ff0.^2)./d; eFdG(i)=sqrt(sum(FdG.*4.*pi^2.*Gqn0.*v*n0^2*df)); fd=(r*ff0.^2./w).^2/d;
efd(i)=sqrt(sum(fd.*4.*pi^2.*Gqn0.*v*n0^2*df)) ; end
for i=1:100
Law1(i)=20*log(ez2(i)/ez2(46)); Law2(i)=20*log(eFdG(i)/eFdG(46)); Law3(i)=20*log(efd(i)/efd(46)); end
plot(f01,Law1,'r',f01,Law2,'b',f01,Law3,'g')
gtext('ez2') gtext('eFdG') gtext('efd') xlabel('f0/Hz')
ylabel('efd/eFdG/ez2 dB') title('fd, dFdG,ez2随f0的变化')
g=linspace(0.125,0.5,100)
for i=1:100
f0=1.5;g2=0.25;r=9;u=10;fs=3;gs=0.25;v=20;Gqn0=2.56*10^(-8);n0=0.1; df=0.2;N=180; f=0.000001:0.2:36; ff0=f/f0; ffs1=f/fs; w=2*pi*f;
d=((1-ff0.^2).*(1+r-ff0.^2/u)-1).^2+4.*g(i)^2.*ff0.^2.*(r-(1/u+1).*ff0.^2).^2; z1q=r*sqrt(((1-ff0.^2).^2+4*g(i)^2*ff0.^2)./d);
z2z1=sqrt((1+(2*g(i)*ff0).^2)./((1-ff0.^2).^2+(2*g(i)*ff0).^2)); pz2=sqrt((1+(2*gs*ffs1).^2)./((1-ffs1.^2).^2+(2*gs*ffs1).^2)); ez2(i)=sqrt(sum(z2z1.^2.*z1q.^2.*4*pi^2.*Gqn0.*v.*n0^2*df)); FdG=(r.*w/9.8).^2.*((ff0.^2./(1+u)-1).^2+4*g(i)^2.*ff0.^2)./d; eFdG(i)=sqrt(sum(FdG.*4*pi^2.*Gqn0.*v.*n0^2*df)); fd=(r*ff0.^2./w).^2/d;
efd(i)=sqrt(sum(fd.*4*pi^2.*Gqn0.*v.*n0^2*df)) ; end
for i=1:100
Law1(i)=20*log(ez2(i)/ez2(34)); Law2(i)=20*log(eFdG(i)/eFdG(34)); Law3(i)=20*log(efd(i)/efd(34)); end
plot(g,Law1,'-.',g,Law2,'r',g,Law3) gtext('ez2') gtext('eFdG') gtext('efd')
xlabel('阻尼比g')
ylabel('efd/eFdG/ez2 dB') title('fd, dFdG,ez2随g的变化')
r=linspace(4.5,18,100) for i=1:100
f0=1.5;g=0.25;r1=9;u=10;fs=3;gs=0.25;v=20;Gqn0=2.56*10^(-8);n0=0.1; df=0.2;N=180; f=0.000001:0.2:36; ff0=f/f0; ffs1=f/fs; w=2*pi*f;
d=((1-ff0.^2).*(1+r(i)-ff0.^2/u)-1).^2+4.*g^2.*ff0.^2.*(r(i)-(1/u+1).*ff0.^2).^2; z1q=r(i)*sqrt(((1-ff0.^2).^2+4*g^2*ff0.^2)./d);
z2z1=sqrt((1+(2*g*ff0).^2)./((1-ff0.^2).^2+(2*g*ff0).^2)); pz2=sqrt((1+(2*gs*ffs1).^2)./((1-ffs1.^2).^2+(2*gs*ffs1).^2)); ez2(i)=sqrt(sum(z2z1.^2.*z1q.^2.*14.*pi^4.*Gqn0.*v.*n0^2*df)); FdG=(r(i).*w/9.8).^2.*((ff0.^2./(1+u)-1).^2+4*g^2.*ff0.^2)./d; eFdG(i)=sqrt(sum(FdG.*4.*pi^4.*Gqn0.*v.*n0^2*df)); fd=(r(i)*ff0.^2./w).^2/d;
efd(i)=sqrt(sum(fd.*4.*pi^4.*Gqn0.*v.*n0^2*df)) ; end
for i=1:100
Law1(i)=20*log(ez2(i)/ez2(34)); Law2(i)=20*log(eFdG(i)/eFdG(34)); Law3(i)=20*log(efd(i)/efd(34)); end