汽车运用工程综合大作业

汽运大作业授课教师：许洪国班级：441002学号：44100221姓名：衡威威汽车动力性计算绘制汽车驱动力与行驶阻力平衡图；；；其他参数已知；又以上条件可求出Ft，并画出图形。；参数均已知，可求出图形。数据表格见：《附表一》（2）求最高车速令Ft=Ff+Fw,得到方程使用MATLAB求解>>p=[0.000165,-0.042,4.16,-173.68,629.58]p=0.0002-0.04204.1600-173.6800629.5800>>px=poly2str(p,'x')px=求解如下：欲求，只需求，用MAITLAB求解如下：先令,求解y’=0的根>>y=[-5.68,176.76,-1852.34,6505.08]y=-142/254419/25-92617/5084566/13>>yx=poly2str(y,'x')yx=-5.68x^3+176.76x^2-1852.34x+6505.08>>formatrat%>>r=roots(y)r=2593/237+1397/676i2593/237-1397/676i1903/206得到对应的速度=1903/206=9.24km/h,此时=0.428二档车速——时间曲线，距离——时间曲线MATLAB程序如下：>>t=cumtrapz(uat,adt)/3.6;t70=max(t);figure(1),plot(t,uat,'b','LineWidth',1.5);title('二档起步的车速—时间曲线');ylabel('ua(km/h)');xlabel('t(s)');gridon;Sa=cumtrapz(t,uat)/3.6;figure(2),plot(t,Sa,'b','LineWidth',1.5);title('二档起步的距离—时间曲线');ylabel('S(m)');xlabel('t(s)');（二）汽车燃料经济性计算求汽车功率平衡图；；；由以上条件可计算出，并画出曲线;，可画出曲线如下：数据表格见：《附表四》求最高挡和次高档的等速百公里油耗曲线；；取8.00N/L；；；;由以上这些条件可求出,并画出曲线如下：(Qs单位：L)数据表格：nuaPebQs4ig482019.619519732.48215644753.097919511.67621456120028.711492284.115953076599.967109510.54027479160038.281989716.428622686558.929866911.50245632200047.852487149.547593942454.886249611.12249132260062.2082332816778013212.10426539300071.778730722.19543041344.773363413.06505805340081.3492281329.72386379343.761266315.39283477388092.8338250441.03739859310.274171516.80850328nuaPebQs3ig382011.609183271.357433164980.580496914.05108563120016.989048692.086663267863.948015413.00411383160022.652064922.977105295838.39008213.50337632200028.315081154.034593844734.692609212.82913937260036.809605496.025392456688.876281413.8189565300042.472621727.683204435629.361835113.95222798340048.135637959.654228637651.867896216.02213114388054.9312574212.49169819676.130413518.84266189求该货车6工况循环行驶的百公里油耗根据题目给出的8条发动机负荷特性曲线，根据ua与Pe和n的关系，利用MATLAB中spline函数三次样条插值法，拟合出三条b—ua曲线，分别是最高档位加速度时b—ua曲线、时b—ua曲线、时b—ua曲线。MATLAB程序如下：>>ua=[19.628.738.347.962.271.881.392.8];b=[753.1599.9558.9454.9379.8344.8343.8310.3];plot(ua,b,'o');holdonua=[19.628.738.347.962.271.881.392.8];b=[753.1599.9558.9454.9379.8344.8343.8310.3];xx=19.6:0.1:92.8;b2=interp1(ua,b,xx,'spline');plot(xx,b2,'r');holdon;ua=[19.628.738.347.962.271.881.392.8];b=[736.39585.89548.09446.67375.47342.04343.36309.39];plot(ua,b,'o');holdon;ua=[19.628.738.347.962.271.881.392.8];b=[736.39585.89548.09446.67375.47342.04343.36309.39];xx=19.6:0.1:92.8;b2=interp1(ua,b,xx,'spline');plot(xx,b2,'g');holdon;ua=[19.628.738.347.962.271.881.392.8];b=[738.70587.84549.58447.81376.06342.42343.41309.51];plot(ua,b,'o');holdon;ua=[19.628.738.347.962.271.881.392.8];b=[738.70587.84549.58447.81376.06342.42343.41309.51];xx=19.6:0.1:92.8;b2=interp1(ua,b,xx,'spline');plot(xx,b2,'y');holdon;注：选择最高档位4档；绿色为时b—ua曲线；黄色为时b—ua曲线；红色为时b—ua曲线。以下是用插值法得出的ua对应的b值：>>ua=[19.628.738.347.962.271.881.392.8];b=[753.1599.9558.9454.9379.8344.8343.8310.3];>>b2=interp1(ua,b,[405060],'spline')b2=544.2961436.3754387.8434>>ua=[19.628.738.347.962.271.881.392.8];b=[736.39585.89548.09446.67375.47342.04343.36309.39];>>xx=40:1:50;>>b2=interp1(ua,b,xx,'spline')b2=533.9729523.9944513.1338501.6817489.9283478.1642466.6798455.7654445.7116436.7224428.7468>>ua=[19.628.738.347.962.271.881.392.8];b=[738.70587.84549.58447.81376.06342.42343.41309.51];>>xx=50:1:60;>>b2=interp1(ua,b,xx,'spline')b2=429.8034422.7012416.4146410.8454405.8953401.4661397.4596393.7775390.3216386.9937383.6955匀速uaPebQtiQa406.923297261544.29611.28313936914.499474875010.37874899436.37541.54216519427.758973496014.98395233387.34841.97630412729.64456191a=0.198Ua(km/h)PebQtiQa(mL)407.143321952533.97291.29880834229.03497485417.449182504523.99441.329109887427.764471019513.13381.356650953438.089417448501.68171.381882558448.42425174489.92831.405366158458.769203847478.16421.427785121469.124503718466.67981.449952864479.490381304455.76541.472823288489.867066555445.71161.4975027314910.25478942436.72241.5249578625010.65377985428.74681.555357539a=0.170Ua(km/h)PebQtiQa(mL)5010.6148866429.80341.55349848535.722937625111.02459668422.70121.5867986415211.44603423416.41461.6229555195311.8794292410.84541.6618798835412.32501153405.89531.7034405665512.78301118401.46611.7474617435613.2536581397.45961.7937188945713.73718224393.77751.8419345145814.23381355390.32161.8917750195914.74378197386.99371.9428462056015.26731746383.69551.994688439匀减速Qi（mL/m）Qd(mL)0.36.45994832故，该货车6工况百公里油耗为：。附表一：ua(km/h)Ft1(N)uaFt2uaFt3uaFt4uaFf+Fw28095.594ig122061.202ig241235.39118ig38880.61816ig40358.49412952.70644171.22282428.34718121300.4645610370.79614924.3365647.962123231.36398161634.7685620407.69815478.40286633.9821637411130469.191015538.73107253.41204040.3979242096.0549640555.291215484.994127611.942244197.95678282245.1557650665.991415152.746147796.842284268.65998322352.9509660801.291613833.41167876.942324293.41118362427.9653670961.191810274.282187902.642364299.16718402477.71801145.69207905.91404298.9379442508.68216901354.79227900.282444291.78638482526.365361001588.49247880.862484262.82878522535.229361101846.79267824.322524183.23438562538.730161202129.69287688.902563978.86558602539.311302437.19307414.41603687.0779642538.397361402769.29326922.222643143.11998682536.406961503125.99346115.282722532.73976364878.102762525.78296383076.762802512.91842490.48056882453.84056922397.32216962314.243761002196.911042036.611761081823.626161121547.216561161195.63256120756.11附表二：uaFtFf+Fw1/a11/a21/a31/a428095.594358.9820.24083357412952.706360.4580.147966899614924.33362.9180.127957089815478.402366.3620.1232947961015538.73370.790.1228404051215484.994376.2020.1233213011415152.746382.5980.1261487621613833.41389.9780.1385982311810274.282398.3420.188664156197114.541402.8930.27761227822061.202358.9821.09459170244171.222360.4580.48894024665647.962362.9180.35254879486633.982366.3620.297279651107253.41370.790.270716077127611.942376.2020.257504538147796.842382.5980.251304906167876.942389.9780.248864011187902.642398.3420.248289099207905.91407.690.248490427227900.282418.0220.249020468247880.862429.3380.250047626267824.322441.6380.252379201287688.902454.9220.257567188307414.41469.190.268276007326922.222484.4420.289422113346115.282500.6780.331855263364878.102517.8980.427327686383076.762536.1020.73336687641235.39118360.4582.1295750782428.34718366.3620.903612648123231.36398376.2020.652585002163741.13278389.9780.555998159204040.3979407.690.512905507244197.95678429.3380.494408163284268.65998454.9220.488558967324293.41118484.4420.489170639364299.16718517.8980.492754099404298.9379555.290.497705964444291.78638596.6180.50423572484262.82878641.8820.514571465524183.23438691.0820.533549423563978.86558744.2180.576024386603687.0779801.290.645659332643143.11998862.2980.8169142118880.61816366.3623.623166882121300.46456376.2022.015916222161634.76856389.9781.496826814201896.11407.691.251821319242096.05496429.3381.117907799282245.15576454.9221.040777986322352.95096484.4420.997177925362427.96536517.8980.975481769402477.71555.290.969213745442508.68216596.6180.974463058482526.36536641.8820.988725041522535.22936691.0821.010350869562538.73016744.2181.038296607602539.31801.291.072045136642538.39736862.2981.11165002682536.40696927.2421.157889921722532.73976996.1221.212556523762525.782961068.9381.278952764802512.911145.691.362791568842490.480561226.3781.473959429882453.840561311.0021.630357911922397.322161399.5621.867418607962314.243761492.0582.2661981981002196.911588.493.0624172251042036.611761688.8585.357917303附表三：uaD1D2D3D4f20.22355223640.35762309860.41191046980.426870564100.42790119120.425341747140.414473226160.375518213180.27364088319011513910160182991411100.199978183120.209733562140.214667422160.216680622180.217165005200.217003397220.216569606240.215728425260.21383563280.20973798300.201773218320165048245360.130418436380.0801823240.03405902180.066809511120.088619679160.102119444200.10954848240.112756212280.113201823320.111954246360.109692171400.10670404440.102888051480.097752153520.090414051560.079601204600.063650824640.04050987880.024106988120.035436319160.044297273200.051037254240.055975669280.059403931320.061585456360.062755664400.06312198440.06286383480.062132649520.061051873560.059716941600.0581953640.056526397680.054721686720.052764623760.05061067800.048187291840.045393957880.042102139920.038155316960.033368971000.0275305851040.0203996511080.0117076621120.00115811700.0099100.0099200.0099300.0099400.0099500.0099600.0099700.0099800.0099900.00991000.00991100.00991200.00991300.00991400.00991500.0099附表四：uaFtPe1Pe2Pe3Pe4Pf+Pw/η28095.5945.047757825412952.70616.15252026614924.3327.91681631815478.40238.604319741015538.7348.443477991215484.99457.931141041415152.74666.13619031613833.4169.003167481712433.36965.895770361810274.28257.65590348197114.54142.1424987522061.2021.28519890344171.2225.20167352565647.96210.5648372686633.98216.54565906107253.4122.6131999127611.94228.47714927147796.84234.03036164167876.94239.29139294187902.64244.34703704207905.9149.2948622227900.28254.1857476247880.86258.96641975267824.32263.42198903287688.90267.1184861307414.4169.34539843326922.22269.05820676346115.28264.82092156364878.10254.74861953374057.04246.7984019241235.391181.54058009782428.347186.056483801123231.3639812.08890378163741.1327818.661343212