文档介绍：汽车理论作业-Matlab程序-轻型货车动力性能评价
轻型货车动力学性能评价
4209XX班 姓名：XX 学号：XXXXXXXX
已知条件
该轻型货车相关参数如下：
装载质量
2000kg
整车装备质量
plot(ua(k,:),Ft(k,:),'LineWidth',2);
hold on
end
u = linspace(0,max(ua(5,:)),100000);
Fw = CDA * u.^2/;
plot(u,Fw+Ff,'r','LineWidth',1); %输出驱动力与行驶阻力平衡图
%求解最高车速
syms nn; i0=; ig = ;
FT = (- + * (nn/1000) - * (nn/1000)^2 ...
+ * (nn/1000)^3 - * (nn/1000)^4) *ig*i0 * ita/r;
FF = CDA * ( * nn * r/i0/ig)^2/+Ff;
FT = eval(FT); FF = eval(FF);
s = solve(FF - FT);
ua_max = *eval(s(1))*r/ig/i0 %输出最高车速
%求解最大爬坡度
Fw1 = CDA * ua(1,:).^2/;
Fo = Ft(1,:)-Fw1; DImax = max(Fo)/G; %最大动力因数
alpha = asin((DImax-f*sqrt(1-DImax^2+f^2))/(1+f^2));
i_max =tan(alpha) %输出最大爬坡度
%计算最大爬坡度相应的附着率
Fzs2 = G*(a*cos(alpha)/L + hg*sin(alpha)/L) %后轮点面法向反力
s = i_max/(a/L)
%加速性能评价
ua1 = max(ua(1,:)); ua2 = max(ua(2,:)); ua3 = max(ua(3,:));
ua4 = max(ua(4,:)); %换挡时刻的速度
ua_all = [ua(2,:) ua(3,:) ua(4,:) ua(5,:)];
Fw_p = CDA * ua.^2/; %每挡对应的空气阻力
delta_a = delta * ones(1,length(Ft));
a_p = (Ft - Fw_p-Ff)./(m*delta_a); %各挡加速度
figure; %绘制汽车行驶加速度曲线
for k =1:5
plot(ua(k,:),a_p(k,:),'LineWidth',2)