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1.计算并绘制利用附着系数曲线和制动效率曲线
| clc close all %空载(no load)-1 ;满载(full load)-2 m1=4080; m2=9290; hg1=0.845; hg2=1.170; L=3.950; a1=2.100; a2=2.950; b1=L-a1; b2=L-a2; beta=0.38; %利用附着系数与制动强度的关系曲线 z=0:0.01:1; phi_f1=L*beta.*z./(b1+z*hg1);%前轮利用附着系数(空载) phi_r1=L*(1-beta).*z./(a1-z*hg1);%空载时后轮利用附着系数(空载) phi_f2=L*beta.*z./(b2+z*hg2);%前轮利用附着系数(满载) phi_r2=L*(1-beta).*z./(a2-z*hg2);%后轮利用附着系数(满载) phi=z;%最理想情况 figure(1); plot (z, phi_f1,'g--', z, phi_f2,'g-',z, phi_r1,'b--',z, phi_r2,'b-',z, phi,'k-'); axis([0,1,0,1]);grid on;box off;axis square; title('利用附着系数与制动强度的关系曲线'); xlabel('制动强度 z/g'); ylabel( '利用附着系数{\phi}'); %ECE 法规要求界限 hold on; z1=0.2:0.01:0.8;z2=0.15:0.01:0.3;z3=0.3:0.01:1; phi1=(z1+0.07)/0.85; phi2=z2-0.08;phi3=z2+0.08;phi4=(z3-0.02)/0.74; plot (z1, phi1,'r-.',z2,phi2,'r-.',z2,phi3,'r-.',z3,phi4,'r-.') legend('{\phi}_{f}(空载)','{\phi}_{f}(满载)','{\phi}_{r}(空载)','{\phi}_{r}(满载)','{\phi}=z','ECE 法规要求界限'); legend( 'Location', 'northwest'); %制动效率曲线 Ef1=z./phi_f1*100; Er1=z./phi_r1*100; Ef2=z./phi_f2*100; Er2=z./phi_r2*100; figure(2); plot (phi_f1, Ef1,'k', phi_rl, Er1,'k',phi_f2, Ef2,'b',phi_r2, Er2,'b'); axis([0,1,0,100]); grid on; box off; axis square; title('制动效率曲线'); xlabel('附着系数{\phi}'); ylabel('制动效率(%)'); text(0.25,90,'E_f'); text(0.6,88','满载'); text(0.8,90,'E_r'); text(0.7,65,'空载'); text(0.72,72,'E_r');
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