汽車(chē)?yán)碚摯笞鳂I(yè)

1、一、確定一輕型貨車(chē)的動(dòng)力性能。一、確定一輕型貨車(chē)的動(dòng)力性能。1）繪制汽車(chē)驅(qū)動(dòng)力與行駛阻力平衡圖；繪制汽車(chē)驅(qū)動(dòng)力與行駛阻力平衡圖；2）求汽車(chē)最高車(chē)速與最大爬坡度；求汽車(chē)最高車(chē)速與最大爬坡度；3）繪制汽車(chē)行駛加速度倒數(shù)曲線(xiàn)；用計(jì)算機(jī)求汽車(chē)用Ⅱ檔起繪制汽車(chē)行駛加速度倒數(shù)曲線(xiàn)；用計(jì)算機(jī)求汽車(chē)用Ⅱ檔起步加速行駛至步加速行駛至70kmh所需所需的加速時(shí)間。的加速時(shí)間。已知數(shù)據(jù)略。已知數(shù)據(jù)略。（參見(jiàn)《汽車(chē)?yán)碚摗妨?xí)題第一章第（參見(jiàn)《汽車(chē)?yán)碚摗妨?xí)題第一章

2、第3題）題）解題程序如下解題程序如下:用Matlab語(yǔ)言語(yǔ)言(1)繪制汽車(chē)驅(qū)動(dòng)力與行駛阻力平衡圖繪制汽車(chē)驅(qū)動(dòng)力與行駛阻力平衡圖m1=2000m2=1800mz=3880g=9.81r=0.367CdA=2.77f=0.013nT=0.85ig=[5.562.7691.6441.000.793]i0=5.83If=0.218Iw1=1.798Iw2=3.598Iw=2Iw14Iw2fi=1:69n(i)=(i11)50Ttq(i)=19.

3、313295.27(n(i)1000)165.44(n(i)1000)^240.874(n(i)1000)^33.8445(n(i)1000)^4endfj=1:5fi=1:69Ft(ij)=Ttq(i)ig(j)i0nTrua(ij)=0.377rn(i)(ig(j)i0)Fz(ij)=CdAua(ij)^221.15mzgfendendplot(uaFtuaFfuaFfFw)title(汽車(chē)驅(qū)動(dòng)力與行駛阻力平衡圖)xlabel(ua

4、(kmh))ylabel(Ft(N))gtext(Ft1)gtext(Ft2)Ft(p)=Ttq(p)ig(1)i0nTrua(p)=0.377rn2(p)(ig(1)i0)Fz(p)=CdAua(p)^221.15mzgfaf(p)=asin((Ft(p)Fz(p))(mzg))endfp=1:150if(af(p)==max(af))i=tan(af(p))disp(汽車(chē)最大爬坡度=)disp(i)endend汽車(chē)最高車(chē)速汽車(chē)最高車(chē)

5、速=99.0679kmh汽車(chē)最大爬坡度汽車(chē)最大爬坡度=0.3518（3）計(jì)算計(jì)算2檔起步加速到檔起步加速到70kmh所需時(shí)間所需時(shí)間fi=1:69n(i)=(i11)50Ttq(i)=19.313295.27(n(i)1000)165.44(n(i)1000)^240.874(n(i)1000)^33.8445(n(i)1000)^4endfj=1:5fi=1:69deta=1Iw(mzr^2)Ifig(j)^2i0^2nT(mzr^2