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matlab_qudong_lizuli_pinghengtu

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  • Update : 2015-06-23
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  • Author :liy***
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1.3 确定一轻型货车的动力性能(货车可装用4挡或5挡变速器,任选 其中的一种进行整车性能计算): 1)绘制汽车驱动力与行驶阻力平衡图。 2)求汽车最高车速,最大爬坡度及克服该坡度时相应的附着率。 3)绘制汽车行驶加速度倒数曲线,用图解积分法求汽车用2档起步加速行驶至70km/h的车速-时间曲线,或者用计算机求汽车用2档起步加速行驶至70km/h的加速时间。 轻型货车的有关数据: 汽油发动机使用外特性的Tq-n曲线的拟合公式为 式中,Tq为发动机转矩(N• m) n为发动机转速(r/min)。 发动机的最低转速nmin=600r/min,最高转速nmax=4000r/min。 装载质量 2000kg 整车整备质量 1800kg 总质量 3880kg 车轮半径 0.367m 传动系机械效率 ηt=0.85 滚动阻力系数 f=0.013 空气阻力系数×迎风面积
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matlab_驱动力—阻力平衡图.doc
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