汽车理论第五版课后习题答案

汽车理论第五版课后习题答案第一章汽车的动力性1.1 试说明轮胎滚动阻力的定义，产生机理和作用形式。

定义:汽车在水平道路上等速行驶时受到的道路在行驶方向上的分力称为滚动祖力。

2)产生机理:由于轮胎内部摩擦产生弹性轮胎在硬支律路面上行驶时加载变形曲线和卸载变形曲线不重合会有能全损失，即弹性物质的迟滞损失。

这种迟滞损失表现为一种阻力偶。

当车轮不滚动时，地面对丰轮的法向反作用力的分布是前后对称的;当车轮滚动时，由于弹性阻滞现象，处于压缩过程的前部点的地面法向反作用力就会大于处于压缩过程的后部点的地面法向反作用力，这样，地面法向反作用力的分布前后不对称，而使他们的合力F相对于法线前移一个距离a，它随弹性迟滞损Z 失的增大变大。

即滚动时有滚动阻力偶T= Fa阻碍车轮滚动。

f Z.•3]作用形式: T= Wf，T= T/r f f f1.2 滚动阻力系数与哪些因素有关, 答:滚动阻力系数与路面的种类、行驶车速以及轮胎的构造、材料和气压有关。

1.32 =494.312+0.13Uain plaque; four people into housing estates such as temperature in the shed beside a pile of dead leaves. At this point, running footsteps village people, "down with Japan devil, dare it! to avenge dead!" Red shasheng, slogan, roar of the bullet, grenade explosions were heard. After about half an hour after the gunfire stopped, came the sound of boots trampling the enemy, flogged, inmates issued a cry of pain. Atthis time, 5, 6 the devil entered the Department a few people hiding the mansion, kicked open the shed door, suddenly a beam of light came in, I saw the Devil with a bayoneted gun, that pile of dry leaves dump to the corner stamp. The scene, hiding behind that plaque, Xie Chengji was seen clearly, see the danger he issued "blimey" shrieks, which fell from behind the plaque. Sheds and tossing the Devils heard the cry, they rushed onto the Hall, Xie was stabbing with bayonets, Xie Chengji was blood like a fountain, and herring. When the second batch of Devils come in, a look at the Windows and doors wide open, lay corpses in the House, only a perfunctory look at, left in a hurry. Xie's tragic death, but Wen Yongzhi, 4 people had been saved. That day, the farmers in the village virtually gone, leaving behind several people could not bear to share in the family business. In that bloody battle, the village more than more than 40 villagers were innocent of killing, Qiu surname, Wang Jiavillage north a peasant由计算机作图有:in plaque; four people into housing estates such as temperature in the shed beside a pile of dead leaves. At this point, running footsteps village people, "down with Japan devil, dare it! to avenge dead!" Red shasheng, slogan, roar of the bullet, grenade explosions were heard.After about half an hour after the gunfire stopped, came the sound of boots trampling the enemy, flogged, inmates issued a cry of pain. Atthis time, 5, 6 the devil entered the Department a few people hiding the mansion, kicked open the shed door, suddenly a beam of light came in, I saw the Devil with a bayoneted gun, that pile of dry leaves dump to the corner stamp. The scene, hiding behind that plaque, Xie Chengji was seen clearly, see the danger he issued "blimey" shrieks, which fell from behind the plaque. Sheds and tossing the Devils heard the cry, they rushed onto the Hall, Xie was stabbing with bayonets, Xie Chengji was blood like a fountain, and herring. When the second batch of Devils come in, a look at the Windows and doors wide open, lay corpses in the House, only a perfunctory look at, left in a hurry. Xie's tragic death, but Wen Yongzhi, 4 people had been saved. That day, the farmers in the village virtually gone, leaving behind several people could not bear to share in the family business. In that bloody battle, the village more than more than 40 villagers were innocent of killing, Qiu surname, Wang Jiavillage north a peasantin plaque; four people into housing estates such as temperature in the shed beside a pile of dead leaves. At this point, running footsteps village people, "down with Japan devil, dare it! to avenge dead!" Red shasheng, slogan, roar of the bullet, grenade explosions were heard. After about half an hour after the gunfire stopped, came the sound of boots trampling the enemy, flogged, inmates issued a cry of pain. Atthis time, 5, 6 the devil entered the Department a few people hiding the mansion, kicked open the shed door, suddenly a beam of light came in, I saw the Devil with a bayoneted gun, that pile of dry leaves dump to the corner stamp. The scene, hiding behind that plaque, Xie Chengji was seen clearly, see the danger he issued "blimey" shrieks, which fell from behind the plaque. Sheds and tossing the Devils heard the cry, they rushed onto the Hall, Xie was stabbing with bayonets, Xie Chengji was blood like a fountain, and herring. When the second batch of Devils come in, a look at the Windows and doors wide open, lay corpses in the House, only a perfunctory look at, left in a hurry. Xie's tragic death, but Wen Yongzhi, 4 people had been saved. That day, the farmers in the village virtually gone, leaving behind several people could not bear to share in the family business. In that bloody battle, the village more than more than 40 villagers were innocent of killing, Qiu surname, Wang Jiavillage north a peasant1.4 空车、满载时汽车动力性有无变化,为什么,答:动力性会发生变化。