汽车整车性能计算分解

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1、6汽车总体性能计算6.1汽车动力性计算6.1.1汽车各档车速计算各挡车速的计算公式如下：(km/h)(6-1)式中r——汽车滚动半径，r=0.279m；n——发动机转速（r/min）；ig——汽车变速器的传动比,=3.17；=2.158；=1.469；=1；i0——主减速器的传动比，i0=5.01。代入相关参数所得结果见表6-1。表6-1汽车各档车速n(r/min)Ua1(km/h)Ua2(km/h)Ua(km/h)Ua4(km/h)10006.622919.7287414.2917720.9946112007.9474911.6744817.15012

2、25.1935314009.2720713.6202320.0084829.39246160010.5966515.5659822.8668333.59138180011.9212317.5117225.7251937.79030200013.2458119.4574728.5835441.98922220014.5703921.4032231.4418946.18814240015.8949723.3489634.3002550.38707260017.2195525.2947137.1586054.58599280018.5441427.240464

3、0.0169658.78491300019.8687229.1862142.8753162.98383320021.1933031.1319545.7336767.18275340022.5178833.0777048.5920271.38168360023.8424635.0234551.4503775.58060380025.1670436.9691954.3087379.77952400026.4916238.9149457.1670883.97844420027.8162040.8606960.0254488.17737440029.140784

4、2.8064462.8837992.37629460030.4653744.7521865.7421496.57521480031.7899546.6979368.60050100.77413500033.1145348.6436871.45885104.973056.1.2汽车行驶阻力计算汽车行驶阻力包括：滚动阻力、空气阻力、加速阻力和爬坡阻力。1）滚动阻力滚动阻力计算公式：Ff=Gf(N)（6-2）式中G——汽车重力,G=14250N；f——滚动阻力系数,f=0.015。2）空气阻力空气阻力计算公式：(N)（6-3）式中CD——汽车的空气阻力系数,C

5、D=0.52；A——汽车的迎风面积A=2.726；Ua——汽车各档车速(km/h)。代入相关参数有：所以，汽车的行驶阻力所得结果见表6-2。表6-2汽车各档行驶阻力(Ff+Fw)1(Ff+Fw)2(Ff+Fw)3(Ff+Fw)4216.67595220.06369227.37518243.15261217.96337222.84171233.37026256.08976219.48487226.12483240.45536271.37912221.24044229.91304248.63047289.02069223.23009234.20635257.

6、89559309.01446225.45381239.00475268.25073331.36045227.91161244.30824279.69588356.05864230.60349250.11684292.23105383.10905233.52944256.43052305.85623412.51166236.68947263.24930320.57143444.26648240.08358270.57318336.37664478.37351243.71176278.40215353.27187514.83275247.57402286.7

7、3622371.25711553.64420251.67035295.57538390.33236594.80785256.00077304.91964410.49763638.32372260.56525314.76899431.75292684.19180265.36382325.12344454.09822732.41208270.39646335.98298477.53353782.98457275.66317347.34761502.05886835.90927281.16396359.21734527.67420891.18619286.89

8、883371.59217554.37956948.815316.1.3汽车驱动力