MATLAB的發(fā)動(dòng)機(jī)萬(wàn)有特性曲線繪制方法程序

1、%不同轉(zhuǎn)速下的燃油消耗率與扭矩的曲線擬合clear allbe1=222.8,220.4,232.4,228.5,227.8,232.6,248.5,245.9,272.4,329.7;Ttq1=399.8,354.1,318.5,278.1,236.2,203.6,185.3,157.2,117.2,80.8;T1=80:320/9:400;%轉(zhuǎn)換矩陣格式Be1=interp1(Ttq1,be1,T1,'spline'%n=1400r/min時(shí)燃油消耗率與扭矩的曲線擬合be2=222.0,221.7,235.4,226.5,230.5,236.8,249.1,276.1,40

2、7.9,487.0;Ttq2=409.1,365.7,328.3,284.1,243.7,203.2,164.3,123.9,83.5,39.7;T2=39:371/9:410;Be2=interp1(Ttq2,be2,T2,'spline'be3=226.0,225.3,226.4,233.9,242.1,283.3,253.9,271.4,323.5,468.6;Ttq3=408.3,368.3,328.3,289.0,244.4,208.8,167.7,132.1,89.5,46.1;T3=46:363/9:409;Be3=interp1(Ttq3,be3,T3,'

3、;spline'be4=206.5,231.1,231.1,233.0,242.0,244.9,265.0,299.8,398.0,596.8;Ttq4=425.6,380.3,332.7,290.9,244.4,205.1,160.2,114.5,68.8,30.7;T4=30:396/9:426;Be4=interp1(Ttq4,be4,T4,'spline'be5=234.7,259.8,235.5,237.6,242.8,292.3,277.9,308.7,396.2,605.9;Ttq5=420.7,379.6,334.6,291.6,244.4,202.8,

4、157.5,116.0,74.1,37.8;T5=37:384/9:421;Be5=interp1(Ttq5,be5,T5,'spline'be6=174.2,242.2,252.1,287.4,253.6,263.6,290.6,316.8,378.0,518.8;Ttq6=404.6,360.5,322.7,283.0,243.3,205.5,162.1,124.7,86.8,52.4;T6=52:353/9:405;Be6=interp1(Ttq6,be6,T6,'spline'be7=256.9,253.7,253.5,260.0,303.8,280.7

5、,300.6,346.6,435.6,812.9;Ttq7=378.0,344.7,310.3,264.3,226.1,186.8,154.2,115.3,76.3,34.1;T7=34:344/9:378;Be7=interp1(Ttq7,be7,T7,'spline'be8=257.9,295.3,282.4,288.7,301.9,329.7,357.0,475.4,580.3,1080.1;Ttq8=315.6,275.5,242.5,210.3,178.5,145.6,118.6,72.6,52.8,22.4;T8=22:294/9:316;Be8=interp1(T

6、tq8,be8,T8,'spline'B=Be1'Be2'Be3'Be4'Be5'Be6'Be7'Be8'N=1400*ones(10,1;1600*ones(10,1;1800*ones(10,1;2000*ones(10,1;2200*ones(10,1;2400*ones (10,1;2600*ones(10,1;2800*ones(10,1;Ttqn=T1'T2'T3'T4'T5'T6'T7'T8'G=ones(80,1,N,Ttqn,N.2,

7、N.*Ttqn,Ttqn.2;A=GB;%A為6*1矩陣n,Ttq=meshgrid(1400:2800,100:600;%生成n-Ttq平面上的自變量“格點(diǎn)”矩陣be=A(1+n.*A(2+Ttq*A(3+n.2*A(4+n.*Ttq*A(5+Ttq.2*A(6;Pe=Ttq.*n/9550;%外特性實(shí)驗(yàn)數(shù)據(jù)擬合Nw=1403,1597,1797,1986,2102,2199,2303,2400,2507,2598,2700,2802; Ttqw=474,497,515,526,528.8,522.8,509.5,492.2,471.2,448.4,408.3,357.4; n0=1400:

8、2800;Ttqw_N=interp1(Nw,Ttqw,n0,'spline'h=repmat(Ttqw_N,501,1;ii=find(Ttq>h;%確定超出邊界的“格點(diǎn)”下標(biāo)be(ii=NaN;%強(qiáng)制為非數(shù)Pe(ii=NaN;%強(qiáng)制為非數(shù)%繪制等燃油消耗率曲線和等功率曲線三維擬合圖subplot(1,2,1;mesh(n,Ttq,be;hold on;mesh(n,Ttq,Pe;axis(1000,3000,100,600,0,500;hold on;xlabel('n(r/min'ylabel('Ttq(N*m'zlabel('Pe(KW be(g/(KW*h'title('等燃油消耗曲線和等功率曲線的三維擬合圖'%繪制邊界線(外特性曲線subplot(1,2,2;plot(n0,Ttqw_N,'LineWidth',2;axis(1400,2800,100,550;xlabel('n(r/min'ylabel('Ttq(N*m'title('萬(wàn)有特性曲線'hold on;%繪制等油耗率曲線的二維圖B=contour(n,Ttq,be,11;%畫等位線,并給出標(biāo)識(shí)數(shù)據(jù)clabel(B;%把“等位值”沿等位線隨機(jī)標(biāo)識(shí)