汽车理论编程题Word格式文档下载.docx
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plot(Ua,1./Ac);
endaxis([098010]);
text(5,,'
1'
text(10,1,'
2'
text(20,,'
3'
text(30,,'
4'
text(40,4,'
5'
title('
行驶加速度倒数曲线'
xlabel('
Ua/(km/h)'
ylabel('
1/a'
u
(1)=*r*600/i0/;
dt=;
w=1;
t
(1)=0;
ig=;
while(u(w)<
n(w)=u(w)*ig*i0/r;
Ttq(w)=+*n(w)/*(n(w)/1000F2+*(n(w)/1000F*(n(w)/1000)M;
Ft(w)=Ttq(w)*ig*i0*eff/r;
Ff=G*f;
Fw(w)=CdA*u(w)A2/;
a(w)=*(Ft(w)-(Ff+Fw(w)))/q/m;
u(w+1)=u(w)+a(w)*dt;
if(u(w+1)>
=*4000*r/i0)
end
t(w+1)=(w+1)*dt;
w=w+1;
plot(t,u);
holdon
u=70;
axis([0600100]);
2挡原地起步加速时间曲线'
时间t/s'
),ylabel('
车速u/(km/h)'
[x1,y1]=ginput
(1);
加速到70km/h的时间'
disp(x1);
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Q
lw仁;
Iw=lw1+lw2;
lf=;
Ttq=+*n/*power(n,2)/1000000+*power(n,3)/.8445*power(n,4)/;
forig=[,,,,]
Ua=*r*n/ig/iO;
Pe=Ttq.*n/9550;
plot(Ua,Pe);
Pmax=max(Pe);
plot(Ua,Pmax);
Ua=0:
:
max(Ua);
Pf=G*f*Ua/3600;
Pw=CdA*Ua.A3/76140;
plot(Ua,(Pf+Pw)/eff);
text(10,50,'
text(15,35,'
text(30,40,'
text(40,30,'
text(70,40,'
text(110,80,'
(P_f+P_w)/n'
驱动力-行驶阻力平衡图'
汽车的功率平衡图'
),xlabel('
P/kw'
n仁[815,1207,1614,2012,2603,3006,3403,3804];
b0=[,,,,,,,];
b1=[,,,,,,,];
b2=[,,,,,,,];
b3=[,,,,,,,];
b4=[,,,,,,,];
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);
pg=7;
forig=[,]
Ua=*r*n/ig/i0;
P=(Pf+Pw)/eff;
b=B0+B1.*P+B2.*P.A2+B3.*P.A3+B4.*P.A4;
Q=P.*b./*Ua*pg);
plot(Ua,Q);
axis([01001228]);
text(40,14,'
四挡'
百公里油
text(80,16,'
五档'
最高挡与次高挡等速百公里油耗曲线’),xlabel('
耗Qs/(L/100km)'
|D^i
—□
立伴旧曲E耳型二(i口
4
口口用■
a
3
主函数:
iO=[,,,,];
fori=1:
5
y(i)=jiasushijian(iO(i));
y;
b(i)=youhao(iO(i));
b;
plot(b,y,'
+r'
b1=linspace(b
(1),b(5),100);
y1=spline(b,y,b1);
plot(b1,y1);
text,,'
i_0='
燃油经济性一加速时间曲线'
百公里油耗(L/100km)'
加速时间s'
子函数1
functiony=jiasushijian(iO)
n1=linspace(0,5000);
nmax=4000;
nmin=600;
r=;
yita=;
CDA=;
f=;
G=(3880)*;
ig=[,,,];
fori=1:
uamax(i)=chesu(nmax,r,ig(i),i0);
uamin(i)=chesu(nmin,r,ig(i),i0);
ua(i,:
)=linspace(uamin(i),uamax(i),100);
n(i,:
)=zhuansu(ua(i,:
),r,ig(i),i0);
Ttq(i,:
)=zhuanju(n(i,:
));
Ft(i,:
)=qudongli(Ttq(i,:
),ig(i),i0,yita,r);
F(i,:
)=f*G+CDA*(ua(i,:
)A2)/;
delta(i,:
)=1+++*(ig(i)A2)*(iOA2)*yita)/(388O92);
a(i,:
)=1./(delta(i,:
).*3880./(Ft(i,:
)-F(i,:
)));
F2(i,:
)=Ft(i,:
temp1(1,:
)=ua(2,:
)/;
temp1(2,:
)=1./a(2,:
n1=1;
forj1=1:
100
ifua(3,j1)>
max(ua(2,:
))&
&
ua(3,j1)<
=70
temp2(1,n1)=ua(3,j1)/;
temp2(2,n1)=1./a(3,j1);
n1=n1+1;
n2=1;
ifua(4,j1)>
max(ua(3,:
ua(4,j1)<
=70;
temp3(1,n2)=ua(4,j1)/;
temp3(2,n2)=1./a(4,j1);
n2=n2+1;
y=temp1(1,1)*temp1(2,1)+qiuji(temp1(1,:
),temp1(2,:
))+qiuji(temp2(1,:
),temp2(2,:
))+qiuji(temp3(1,:
),temp3(2,:
子函数2
function[ua]=chesu(n,r,ig,i0)
ua=*r*n/i0./ig;
子函数3
function[q]=jiasu(umax,umin,ig,a,ua0,i0)globalfGCDAyitamrIfIw1Iw2pgB0B1B2B3B4n;
ua1=umin:
umax;
delta=1+(Iw1+Iw2)/(m*rA2)+(If*igA2*i0A2*yita)/(m*rA2);
P0=(G*f.*ua0./3600+CDA.*ua043/76140+(delta*m.*ua0/3600)*a)/yita;
P=(G*f.*ua1/3600+CDA.*ua1.A3/76140+(delta*m.*ua1/3600)*a)/yita;
dt=1/*a)
3401
b0(i)=B0(i)+B1(i)*P0(i)+B2(i)*(P0(i))A2+B3(i)*(P0(i))A3+B4(i)*(P0(i))A4;
b1=interp1(ua0,b0,ua1);
Qt=P.*b1./.*pg);
i1=size(Qt);
i=i1
(2);
Qt1=Qt(2:
i-1);
q=(Qt
(1)+Qt(i))*dt./2+sum(Qt1)*dt;
子函数4
function[y]=zhuanju(n)
y=+.*(n./1000).*(n./1000)92+.*(n./1000).~*(n./1000)94;
子函数5
function[n]=zhuansu(ua,r,ig,i0)
n=ig*i0.*ua./*r);
子函数6
function[b]=youhao(i0)
globalfGCDAyitamrIfIw1Iw2pgB0B1B2B3B4n
%i0=;
If=;
Iw1=;
m=3880;
n0=[8151207161420122603300634033804];
B00=[];
B10=[];
B20=[];
B30=[];
B40=[];
B0=spline(n0,B00,n);
B1=spline(n0,B10,n);
B2=spline(n0,B20,n);
B3=spline(n0,B30,n);
B4=spline(n0,B40,n);
ua4=*r.*n./(i0*ig(4));
F4=f*G+CDA*(ua492)/;
P_fw4=F4.*ua4./(yita**1000);
b4(i)=B0(i)+B1(i)*P_fw4(i)+B2(i)*(P_fw4(i))A2+B3(i)*(P_fw4(i))A3+B4(i)*(P_fw4(i
))A4;
pg=;
ua4_m=[25,40,50];
s_m=[50,250,250];
b4_m=spline(ua4,b4,ua4_m);
F4_m=f*G+CDA*(ua4_m42)/;
P_fw4_m=F4_m.*ua4_m./(yita**1000);
Q4_m=P_fw4_m.*b4_m.*s_m./(102.*ua4_m.*pg);
Q4_a1=jiasu(40,25,ig(4),,ua4,i0);
Q4_a2=jiasu(50,40,ig(4),,ua4,i0);
Qid=;
tid=;
s=1075;
Q_i=Qid*tid;
Q4all=(sum(Q4_m)+Q4_a1+Q4_a2+Q_i)*100/s;
b=Q4all;
子函数7
function[p]=qiuji(xO,yO)
nO=size(xO);
n=nO
(2);
x=linspace(x0
(1),x0(n),200);
y=spline(xO,yO,x);
plot(x,y);
p=trapz(x,y);
h3Til135
13713313,U1J.114J1J3
百盘里油tUntflkni)
」3■□
21
beta=;
L=;
a仁;
b仁L-a1;
hg仁;
a2=;
b2=L-a2;
hg2=;
g=;
z=0:
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'
text,,'
$_r(空车)'
$_r(满载)'
text,1,'
$=z'
$_f(满载)'
);
$_f(空车)'
制动强度z/g'
利用附着系数$'
利用附着系数与制动强度的关系曲线'
fai=0:
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);
plot(fai,Ef1,'
fai,Er1,'
fai,Ef2,'
fai,Er2,'
E_f'
满载'
E_r'
空载'
附着系数$'
制动效率'
前、后制动效率曲线'
axis([0101]);
fai=;
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=;
t22=;
u0=30;
s1=1/*(t21+t22/2)*u0+u0A2/abmax1;
s2=1/*(t21+t22/2)*u0+u0A2/abmax2;
空载时的制动距离'
),disp(s1);
满载时的制动距离'
),disp(s2);
z1=a1*fai/(L+fai*hg1);
z2=a2*fai/(L+fai*hg2);
abmax1=z1*g;
abmax2=z2*g;
前部管路损坏时空载制动距离'
disp(s1);
前部管路损坏时满载制动距离'
disp(s2);
z1=b1*fai/(L-fai*hg1);
z2=b2*fai/(L-fai*hg2);
后部管路损坏时空载制动距离'
后部管路损坏时满载制动距离
'
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m=;
lz=3885;
a=;
b=;
k1=-62618;
k2=-110185;
i=20;
R0=15;
u仁;
K=m*(a/k2-b/k1)/LA2;
Uch=(1/K)A(1/2);
稳定性因数(sA2/mA2)K='
disp(K);
特征车速(m/s)Uch='
disp(Uch);
u=0:
30;
S=u./(L*(1+K*u.A2));
plot(u,S);
汽车稳态横摆角速度增益曲线'
车速u(m⑸'
稳态横摆角速度增益'
u=s时,转向灵敏度为’);
disp(S(448));
SM=k2/(k1+k2)-a/L;
ay=*g;
A=K*ay*L;
B=L/R0;
R=L/(B-A);
C=R/RO;
静态储备系数=);
disp(SM);
侧向加速度为时前、后轮侧偏角绝对值之差(rad)a1-a2='
disp(A);
侧向加速度为时转弯半径比值R/R0='
W0=L/u1*(k1*k2/(m*Iz)*(1+K*u1A2))A(1/2);
D=(-m*(k1*aA2+k2*bA2)-Iz*(k1+k2))/(2*L*(m*Iz*k1*k2*(1+K*u1A2))A(1/2));
t=atan((1-DA2)A(1/2)/(-m*u1*a*W0/(L*k2)-D))/(W0*(1-DA2)A(1/2));
E=atan((1-DA2)A(1/2)/D)/(W0*(1-DA2)A(1/2))+t;
车速u=s时的瞬态响应参数分别为:
横摆角速度波动的固有(圆)频率(rad)
为'
disp(WO);
阻尼比为'
disp(D);
反应时间(s)为'
disp(t);
峰值反应时间(s)为'
disp(E);
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