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1、解：1）>>clearall>>f=0.013;G=38800;Ff=G*f;CdA=2.77;u1=0:1:120;Fw=CdA.*u1.^2/21.15;F=Ff+Fw;Ig=[5.562.7691.6441.0000.793];k=1:5;>>ngk=[600600600600600];>>ngm=[40004000400040004000];>>r=0.367;I0=5.83;eta=0.85;>>ugk=0.377*r*ngk(k)./(Ig(k).*I0);>>ukm=0.377.*r.*ngm(k)./(Ig(k).*I0);>>fork=1
2、:5u=ugk(k):ukm(k);n=Ig(k)*I0.*u./r/0.377;Tq=-19.313+295.27*n/1000-165.44*(n/1000).^2+40.874*(n/1000).^3-3.8445*(n/1000).^4;Ft=Tq.*Ig(k)*I0*eta/r;plot(u,Ft,u1,F)holdon,gridonend2）最高车速求解程序：>>[n,u]=solve('n=u*0.793*5.83/(0.377*0.367)','(-19.313+295.27*(n/1000)-165.44*(n/1000)^2+40.87
3、4*(n/1000)^3-3.8445*(n/1000)^4)*0.793*5.83*0.85/0.367-(2.77*u^2/21.15+3880*10*0.013)')n=3299.9224534468163066899978278864264.136893381715449564714110612663533.8761660967238474546442908623+2707.8751259314497120563837339829*i3533.8761660967238474546442908623-2707.8751259314497120563
4、837339829*iu=98.7573451959465341846909621859647.9048701073070256438355939579073105.75891807712350450878660177051+81.039043290184796798403093329529*i105.75891807712350450878660177051-81.039043290184796798403093329529*i分析：u的后三个解明显不符合题意，所以最高车速是98.757km/h求最大爬坡度和最大附着系数>>I=0.218;Iw1=1.7
5、98;Iw2=3.598;L=3.2;m=3880;r=0.367;>>eta=0.85;Cd=2.77;f=0.013;i0=5.83;a=1.947;hg=0.9;>>g=10;ig=[5.56;2.769;1.644;1.00;0.793];>>fori=1:5th(i)=1+(Iw1+Iw2)/(m*r^2)+(I*i0^2+(ig(i)^2*eta))/(m*r^2);end>>fori=1:5ual(i,1)=(600*0.377*r)/(ig(i)*i0);ual(i,2)=(4000*0.377*r)/(ig(i)*i0);end>>ua=
6、ual(1,1):.01:ual(1,2);>>[x,y]=size(ua);>>fori=1:yn=ua(i)*ig(1)*i0/(0.377*r);Tq=-19.313+295.27*(n/1000)-165.44*(n/1000)^2+40.874*(n/1000)^3-3.8445*(n/1000)^4;Ft(i)=Tq*ig(1)*i0*eta/r;Fw(i)=Cd*ua(i)^2/21.15;Fc(i)=Ft(i)-Fw(i)end>>plot(ua,Ft/1000,':',ua,Fc/1000,'-',ua,Fw/1000,'--')>>D=
7、max(Fc)/m/g;>>af=asin((D-f*sqrt(1+f^2-D^2))/(1+f^2));>>i=tan(af);>>q=i;>>cf2=q/(a/L+q*hg/L);>>ii=0.3448>>cf2cf2=0.48883）>>clcclearI=0.218;Iw1=1.798;Iw2=3.598;L=3.2;m=3880;r=0.367;eta=0.85;Cd=2.77;f=0.013;i0=5.83;a=1.947;hg=0.9;g=10;ig=[5.56;2.769;1.644;1.00;0.793];umax=96;fori=1:5
8、th(i)=1+(Iw1+Iw2)/(m*r^2)+(I*i0^2
