文档介绍：、1)绘制汽车驱动力与行驶阻力平衡图。2)求汽车的最高车速、最大爬坡度及克服该坡度时相应的附着率。3)绘制汽车行驶加速倒数曲线,用图解积分法求汽车有Ⅱ档起步加速行驶至70km/h的车速-时间曲线,或者用计算机求汽车用Ⅱ档起步加速至70km/h的加速时间。 n_min=600;n_max=4000;m1=2000;m2=1800;mz=3880;g=;r=;CdA=;f=;nT=;ig=[];i0=;If=;Iw1=;Iw2=;Iw=2*Iw1+4*Iw2;L=;a=;b=L-a;hg=;g=;1)绘制汽车驱动力与行驶阻力平衡图:fori=1:3401n(i)=599+i;Ttq(i)=-+*(n(i)/1000)-*(n(i)/1000)^2+*(n(i)/1000)^3-*(n(i)/1000)^4;endforj=1:4fori=1:3401Ft(i,j)=Ttq(i)*ig(j)*i0*nT/r;ua(i,j)=*r*n(i)/(ig(j)*i0);Fz(i,j)=CdA*ua(i,j)^2/+mz*g*f;endendplot(ua,Ft,ua,Fz),gridtitle('汽车驱动力与行驶阻力平衡图');xlabel('ua(km/h)');ylabel('Ft(N)');2)①汽车的最高车速:②最大爬坡度:fork=1:1000n1(k)=1800+k*;Ttq(k)=-+*(n1(k)/1000)-*(n1(k)/1000)^2+*(n1(k)/1000)^3-*(n1(k)/1000)^4;Ft(k)=Ttq(k)*ig(1)*i0*nT/r;ua(k)=*r*n1(k)/(ig(1)*i0);Fz(k)=CdA*ua(k)^2/+mz*g*f;af(k)=asin((Ft(k)-Fz(k))/(mz*g));endfork=1:1000if(af(k)==max(af))i=tan(af(k));disp('汽车最大爬坡度=');disp(i);endend汽车最大爬坡度=③相应的附着率:3)①绘制汽车行驶加速倒数曲线:n=(n_min:1:n_max);N=n./1000;Tq=-+*N-*N.^2+*N.^3-*N.^4;Ft1=Tq*ig(1)*i0*nT/r;Ft2=Tq*ig(2)*i0*nT/r;Ft3=Tq*ig(3)*i0*nT/r;Ft4=Tq*ig(4)*i0*nT/r;ua1=*n*r/ig(1)/i0;ua2=*n*r/ig(2)/i0;ua3=*n*r/ig(3)/i0;ua4=*n*r/ig(4)/i0;Fw1=CdA*ua1.^2/;Fw2=CdA*ua2.^2/;Fw3=CdA*ua3.^2/;Fw4=CdA*ua4.^2/;Ff=mz*g*f;deta1=1+Iw/(mz*r^2)+If*ig(1)^2*i0^2*nT/(mz*r^2);deta2=1+Iw/(mz*r^2)+If*ig(2)^2*i0^2*nT/(mz*r^2);deta3=1+Iw/(mz*r^2)+If*ig(3)^2*i0^2*nT/(mz*r^2);deta4=1+Iw/(mz*r^2)+If*ig(4)^2*i0^2*nT/(mz*r^2);a1=(Ft1-Fw1-Ff)/(deta1*mz);a2=(Ft2-Fw2-Ff)/(deta2*mz);a3=(Ft3-Fw3-Ff)/(deta3*mz);a4=(Ft4-Fw4-Ff)/(deta4*mz);x1=1./a1;x2=1./a2;x3=1./a3;x4=1./a4;plot(ua1,x1,'k',ua2,x2,'b',ua3,x3,'r',ua4,x4,'y'),gridtitle('加速度倒数曲线');xlabel('ua(km/h)');ylabel('1/a');②汽车用Ⅱ档起步加速至70km/、计算与绘制题1中货车的1)汽车功率平衡图;2)最高档与次高档的等速百公里油耗曲线。m1=2000;m2=1800;mz=3880;g=;r=;CdA=;f=;nT=;ig=[];i0