汽车理论课后题matlab程序

汽车理论课后 题 快递公司问题件快递公司问题件货款处理关于圆的周长面积重点题型关于解方程组的题及答案关于南海问题 matlab程序1.3n=600:1:4000;r=0.367;i0=5.83;eff=0.85;f=0.013;m=3880;g=9.8;G=m*g;CdA=2.77;a=1.947;hg=0.9;L=3.2;lw仁1.798;Iw2=3.598;Iw=lw1+lw2;If=0.218;Ttq=-19.313+295.27*n/1000-165.44*(n/1000)八2+40.874*(n/1000)八3-3.8445*(n/1000)八4嗨区动力行驶阻力平衡图forig=[5.56,2.769,1.644,1.00,0.793]Ua=0.377*r*n/ig/i0;驱动力-行驶阻力Ft=Ttq*ig*i0*eff/r;plot(Ua,Ft);holdon;endFf=G*f;ua=0:0.1:max(Ua);Fw=CdA*ua.A2/21.15;plot(ua,(Ff+Fw));title('平衡图')；xlabel('Ua/(km/h)');ylabel('Ft/N');gtext('Ft1'),gtext('Ft2'),gtext('Ft3'),gtext('Ft4'),gtext('Ft5'),gtext('Ff+Fw')[x,y]=ginput(1);disp('汽车的最高车速');disp(x);disp('km/h');%最大爬坡度及最大爬坡度时的附着率Ua=0.377*r*n/5.56/i0;Ft=Ttq*5.56*iO*eff/r;Fw=CdA*Ua.A2/21.15;i=tan(asin((Ft-(Ff+Fw))/G));disp('汽车的最大爬坡度');disp(max(i));C=max(i)/(a/L+hg/L*max(i));disp('克服最大爬坡度时的附着率');disp(C);%加速度倒数曲线figure;forig=[5.562769,1.644,1.00,0.793]Ua=0.377*r*n/ig/i0;q=1+Iw/(m*rA2)+If*igA2*i0A2*eff/(m*rA2);Ft=Ttq*ig*i0*eff/r;Fw=CdA*Ua.A2/21.15;as=(Ft-(Ff+Fw))/q/m;plot(Ua,1./as);holdon;endaxis([098010]);title('行驶加速度倒数曲线');xlabel('Ua/(km/h)');ylabel('1/a');gtext('1/a1'),gtext('1/a2'),gtext('1/a3'),gtext('1/a4'),gtext('1/a5');%加速时间曲线u(1)=0.377*r*600/i0/2.769;dt=0.01;w=1;t(1)=0;ig=2.769;while(u(w)<99.08)n(w)=u(w)*ig*i0/0.377/r;Ttq(w)=-19.313+295.27*n(w)/1000-165.44*(n(w)/1000)八2+40.874*(n(w)/1000)八3-3.8445*(n(w)/1000)A4;Ft(w)=Ttq(w)*ig*i0*eff/r;Ff=G*f;Fw(w)=CdA*u(w)A2/21.15;q=1+lw/(m*rA2)+lf*igA2*i0A2*eff/(m*「A2);a(w)=3.6*(Ft(w)-(Ff+Fw(w)))/q/m;u(w+1)=u(w)+a(w)*dt;if(u(w+1)>=0.377*4000*r/2.769/i0)ig=1.644;endif(u(w+1)>=0.377*4000*r/1.644/i0)ig=1.00;endif(u(w+1)>=0.377*4000*r/1.00/i0)ig=0.793;endt(w+1)=(w+1)*dt;w=w+1;endfigure;plot(t,u);axis([0600100]);title('2挡原地起步加速时间曲线');xlabel('时间t/s'),ylabel('车速u/(km/h)');[x1,y1]=ginput(1);disp('加速到70km/h的时间');disp(x1);驱动力-行驶阻力平衡图14000Ft1120001000080006000Ft24000Ft32000Ft4Ft5Ff+Fw20406080Umax=99.07100120Ua/(km/h)行驶加速度倒数曲线109876543211/a51/a41/a31/a21/a10TC[[[[[[L01020304050607080902挡原地起步加速时间曲线1000102025.8830405060时间t/s1.8Iw仁2.25;Iw2=2.25;Iw=lw1+lw2;lf=0.25;m=1600;g=9.8;G=m*g;Ttqmax=140;i1=3.85;i0=4.08;eff=0.9;r=0.3;hg=0.63;b=1.25;L=2.7;q=1+Iw/(m*rA2)+If*i1A2*i0A2*eff/(m*rA2);Ft=Ttqmax*i1*i0*eff/r;a=Ft/q/m;q=a/g;C1=q/(b/L-hg/L*q);if(C1>0.6)disp('发动机转矩不能充分发挥');elsedisp('发动机转矩能够充分发挥');endb=(q/0.6+hg/L*q)*L;disp('调整后的b值');disp(b);disp('调整后的前轴负荷率'),disp(b/L);1.9lw=3.6;If=0.22;m=2152;g=9.8;r=0.367;eff=0.9;i4=1;i0=4.55;amax=0.75;Ua=50/3.6;CdA=1.5;q=1+Iw/(m*rA2);f=q*0.59/3.6/g;disp('汽车在该路面上的滚动阻力系数');disp(f);q=1+Iw/(m*rA2)+If*i4A2*i0A2*eff/(m*rA2);D4max=f+q*amax/g;disp('最大动力因数');disp(D4max);Fw=CdA*UaA2/21.15;D1max=(D4max*G+Fw)*i1/i4/G;imax=tan(asin((D1max-f*sqrt(1-D1maxA2+fA2))/(1+fA2)));disp('最大爬坡度'),disp(imax);2.7n=600:1:4000;r=0.367;i0=5.83;eff=0.85;f=0.013;CdA=2.77;m=3880;g=9.8;G=m*g;Ttq=-19.313+295.27*n/1000-165.44*(n/1000)八2+40.874*(n/1000)八3-3.8445*(n/1000)八4■Jforig=[5.56,2.769,1.644,1.00,0.793]Ua=0.377*r*n/ig/i0;Pe=Ttq.*n/9550;plot(Ua,Pe);holdon;endUa=0:0.1:max(Ua);Pf=G*f*Ua/3600;Pw=CdA*Ua.A3/76140;plot(Ua,(Pf+Pw)/eff);title('汽车的功率平衡图'),xlabel('Ua/(km/h)'),ylabel('P/kw');%等速百公里燃油消耗n仁[815,1207,1614,2012,2603,3006,3403,3804]；b0=[1326.8,1354.7,1284.4,1122.9,1141.0,105121233.9,1129.7];b仁[-416.46,-303.98,-189.75,-121.59,-98.893,-73.714,-84.478,-45.291];b2=[72.379,36.657,14.524,7.0035,4.4763,2.8593,2.9788,0.71113];b3=[-5.8629,-2.0553,-0.51184,-0.18517,-0.091077,-0.05138,-0.047449,-0.00075215];b4=[0.17768,0.043072,0.0068164,0.0018555,0.00068906,0.00035032,0.00028230,-0.000038568];B0=spline(n1,b0,n);B1=spline(n1,b1,n);B2=spline(n1,b2,n);B3=spline(n1,b3,n);B4=spline(n1,b4,n);deng=7;figure;forig=[1.00,0.793]Ua=0.377*r*n/ig/i0;Pf=G*f*Ua/3600;Pw=CdA*Ua.A3/76140;P=(Pf+Pw)/eff;b=B0+B1.*P+B2.*P.A2+B3.*P.A3+B4.*P.A4;Q=P.*b丿(1.02*Ua*deng);plot(Ua,Q);holdon;endaxis([01001228]);title('最高挡与次高挡等速百公里油耗曲线'),xlabel('Ua/(km/h)'),ylabel('百公里油耗汽车的功率平衡图Qs/(L/100km)');100(Pf+Pw)/eff90805470605040302010020406080100120Ua/(km/h)26mKnuoJTlrASQ耗油里公百2208621114-12:0「一「r「10020406080Ua/(km/h)4.3beta=0.38;L=3.95;a仁2.1;b1=L-a1;hg1=0.845;a2=2.95;b2=L-a2;hg2=1.17;g=9.8;z=0:0.01:1;faif仁beta*z./(1/L*(b1+z*hg1));fair1=(1-beta)*z./(1/L*(a1-z*hg1));faif2=beta*z./(1/L*(b2+z*hg2));fair2=(1-beta)*z./(1/L*(a2-z*hg2));plot(z,faif1,'r',z,fair1,'g',z,faif2,'b',z,fair2,'k');fai=0:0.01:1;Ef1=(b1/L)./(beta-fai*hg1/L);Er1=(a1/L)./((1-beta)+fai*hg1/L);Ef2=(b2/L)./(beta-fai*hg2/L);Er2=(a2/L)./((1-beta)+fai*hg2/L);figure;plot(fai,Ef1,'r',fai,Er1,'g',fai,Ef2,'b',fai,Er2,'k');axis([O101]);fai=0.8;Er1=(a1/L)/((1-beta)+fai*hg1/L);Er2=(a2/L)/((1-beta)+fai*hg2/L);abmax1=fai*Er1*g;abmax2=fai*Er2*g;t21=0.02;t22=0.2;u0=30;s1=1/3.6*(t21+t22/2)*u0+u0A2/25.92/abmax1■Js2=1/3.6*(t21+t22/2)*u0+u0A2/25.92/abmax2■Jdisp('空载时的制动距离'),disp(s1);disp('满载时的制动距离'),disp(s2);%前部管路损坏时制动距离z1=a1*fai/(L+fai*hg1);z2=a2*fai/(L+fai*hg2);abmax仁z1*g;abmax2=z2*g;s1=1/3.6*(t21+t22/2)*u0+u0A2/25.92/abmax1■Js2=1/3.6*(t21+t22/2)*u0+u0A2/25.92/abmax2■Jdisp('前部管路损坏时空载制动距离')；disp(s1);disp('前部管路损坏时满载制动距离');disp(s2);%后部管路损坏时的制动距离z仁b1*fai/(L-fai*hg1);z2=b2*fai/(L-fai*hg2);abmax1=z1*g;abmax2=z2*g;s1=1/3.6*(t21+t22/2)*u0+u0A2/25.92/abmax1■Js2=1/3.6*(t21+t22/2)*u0+u0A2/25.92/abmax2■Jdisp('后部管路损坏时空载制动距离');disp(s1);disp('后部管路损坏时满载制动距离');disp(s2);hg=0.63;b=1.25;L=2.7;beta=0.65;fai=0.7;g=9.8;faiO=(L*beta-b)/hg;if(faivfaiO)disp('前轮先抱死，制动效率为');E=(b/L)/(beta-fai*hg/L);elsedisp('后轮先抱死，制动效率为');E=(a/L)/((1-beta)+fai*hg/L);enddisp('最大制动减速度'),disp(E*fai*g);disp('a)、b)、c)的双回路制动系统制动系增益都为G');disp('1回路失效时，a)、b)、c)的制动系增益分别为0.35,0.5,0.5');disp('1回路失效时，a)、b)、c)的制动系增益分别为0.65,0.5,0.5');disp('a)中1回路失效时最大制动强度');zmax1=a*fai/(L+fai*hg)disp('a)中1回路失效时制动效率');disp(zmax1/fai)disp('a)中1回路失效时最大制动减速度');abmax仁zmax1*gdisp('a)中2回路失效时最大制动强度');zmax2=a*fai/(L+fai*hg)disp('a)中1回路失效时制动效率');disp(zmax1/fai)disp('a)中2回路失效时最大制动减速度');abmax2=zmax2*gdisp('b)或c)中1或2回路失效时最大制动强度');z=fai*b/(2*L*beta-fai*hg)disp('b)或c)中1或2回路失效时最大制动减速度');abmax=z*gdisp('b)或c)中1或2回路失效时制动效率');disp(z/fai)disp('双回路系统a制动系增益最大，一个回路失效时的最大制动减速度也比b、c大，所以其性能较优')disp('b和c制动系增益相同，两者在一个回路失效时的制动效率相同。但是，c在一个回路失效时，制动力作用在一侧车轮上，会产生跑偏等问题')