汽车理论课后习题matlab程序.docx
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汽车理论课后习题matlab程序.docx
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汽车理论课后习题matlab程序
汽车理论课后习题matlab程序
1.3.1驱动力阻力平衡图
m1=2000;
m2=1800;
m=3880;
r0=0.367;
gt=0.85;
f=0.013;
CDA=2.77;
i0=5.83;
If=0.218;
Iw1=1.798;
Iw2=3.598;
Ig4=[6.093.091.711.00];
fori=1:
3401;
n(i)=i+599;
Tq(i)=-19.313+295.27*n(i)./1000-165.44*(n(i)/1000).^2+40.874*(n(i)/1000).^3-3.8445*(n(i)/1000).^4;
end
fori=1:
3401;
forj=1:
4;
Ft(i,j)=Tq(i)*i0*Ig4(j)*gt/r0;
ua(i,j)=0.377*r0*n(i)./Ig4(j)/i0;
F(i,j)=f*m*9.8+CDA*ua(i,j).^2/21.15;
end
end
plot(ua,Ft,ua,F)
xlabel('ua/(km/h)');
ylabel('F/N')
title('汽车驱动力-行驶阻力平衡图');
gtext('Ft1')
gtext('Ft2')
gtext('Ft3')
gtext('Ft4')
gtext('Ff+Fw')
gridon
axis(0,120,0,14000)
1.3.3加速度倒数曲线
m1=2000;
m2=1800;
m=3880;
r0=0.367;
gt=0.85;
f=0.013;
CDA=2.77;
i0=5.83;
If=0.218;
Iw1=1.798;
Iw2=3.598;
Ig4=[6.093.091.711.00];
q=1.128;
fori=1:
3401;
n(i)=i+599;
Tq(i)=-19.313+295.27*n(i)./1000-165.44*(n(i)/1000).^2+40.874*(n(i)/1000).^3-3.8445*(n(i)/1000).^4;
end
fori=1:
3401;
forj=1:
4;
Ft(i,j)=Tq(i)*i0*Ig4(j)*gt/r0;
ua(i,j)=0.377*r0*n(i)./Ig4(j)/i0;
F(i,j)=f*m*9.8+CDA*ua(i,j).^2/21.15;
b(i,j)=q*m/(Ft(i,j)-0.131*ua(i,j)^2-9.8*m*f);%加速度倒数%
end
end
plot(ua,b);
xlabel('ua/(km/h)');
ylabel('1/a/(s^2/m)');
title('加速度倒数曲线')
gtext('1/a1');
gtext('1/a2');
gtext('1/a3');
gtext('1/a4');
gridon;
axis([0,50,0,5])
2.7功率平衡曲线
m1=2000;
m2=1800;
m=3880;
r0=0.367;
gt=0.85;
f=0.013;
CDA=2.77;
i0=5.83;
If=0.218;
Iw1=1.798;
Iw2=3.598;
Ig4=[6.093.091.711.00];
fori=1:
3401;
n(i)=i+599;
Tq(i)=-19.313+295.27*n(i)/1000-165.44*(n(i)/1000)^2+40.874*(n(i)/1000)^3-3.8445*(n(i)/1000)^4;
end
fori=1:
3401;
forj=1:
4;
Ft(i,j)=Tq(i)*i0*Ig4(j)*gt/r0;
ua(i,j)=0.377*r0*n(i)./(Ig4(j)*i0);
Pe(i,j)=Ft(i,j)*ua(i,j)/3600;%PeEXPRESSION%
c(i,j)=7.647*ua(i,j)/1000+3.638*ua(i,j)^3/100000;%(Pf+Pw)/gtEXPRESSION%
end;
end;
plot(ua,Pe,ua,c);
xlabel('ua/(km/h)');
ylabel('Pe/kW');
title('功率平衡图');
gtext('Pe1');
gtext('Pe2');
gtext('Pe3');
gtext('Pe4');
gtext('P阻力');
gridon;
axis([0,90,0,20]);
最高档等速百公里油耗曲线
i0=5.83;r=0.367;t=0.85;m=3880;G=38024;
f=0.013;CdA=2.77;pg=7.12;ig3=1.71;ig4=1;
n=[8151207161420122603300634033804];
B0=[1326.81354.71284.41122.91141.01051.21233.91129.7];
B1=[-416.46-303.98-189.75-121.59-98.893-73.714-84.478-45.291];
B2=[72.37936.65714.5247.00354.47632.85932.97880.71113];
B3=[-5.8629-2.0553-0.51184-0.18517-0.091077-0.05138-0.047449-0.00075215];
B4=[0.177680.0430720.00681640.00185550.000689060.000350320.00028230-0.000038568];
ua=(0.377*r*n)/(ig4*i0);
Tq=-19.313+295.27*n/1000-165.44*((n/1000).^2)+40.874*((n/1000).^3)-3.8445*((n/1000).^4);
P=(1/t)*(G*f*ua/3600+CdA*ua.^3/76140);
b=B0+B1.*P+B2.*P.^2+B3.*P.^3+B4.*P.^4;
Qs=P.*b./(1.02*ua*pg);
b=polyfit(ua,Qs,3);
ua4=8:
1:
100;
f=polyval(b,ua4);
figure;
plot(ua,Qs,'ko',ua4,f,'LineWidth',2);
title('汽车最高档等速百公里油耗曲线');
xlabel('ua/(km/h)');
ylabel('Qs/[1/L(100km)]');
次高档等速百公里油耗曲线
i0=5.83;r=0.367;t=0.85;m=3880;G=38024;
f=0.013;CdA=2.77;pg=7.12;ig3=1.71;ig4=1;
n=[8151207161420122603300634033804];
B0=[1326.81354.71284.41122.91141.01051.21233.91129.7];
B1=[-416.46-303.98-189.75-121.59-98.893-73.714-84.478-45.291];
B2=[72.37936.65714.5247.00354.47632.85932.97880.71113];
B3=[-5.8629-2.0553-0.51184-0.18517-0.091077-0.05138-0.047449-0.00075215];
B4=[0.177680.0430720.00681640.00185550.000689060.000350320.00028230-0.000038568];
ua=(0.377*r*n)/(ig3*i0);
Tq=-19.313+295.27*n/1000-165.44*((n/1000).^2)+40.874*((n/1000).^3)-3.8445*((n/1000).^4);
P=(1/t)*(G*f*ua/3600+CdA*ua.^3/76140);
b=B0+B1.*P+B2.*P.^2+B3.*P.^3+B4.*P.^4;
Qs=P.*b./(1.02*ua*pg);
b=polyfit(ua,Qs,3);
ua4=8:
1:
55;
f=polyval(b,ua4);
figure;
plot(ua,Qs,'ko',ua4,f,'LineWidth',2);
title('汽车次高档等速百公里油耗曲线');
xlabel('ua/(km/h)');
ylabel('Qs/[1/L(100km)]');
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