土壤的物理机械性质及其对车辆行驶性能的影响.doc

. . 大学 大学 毕 业 论 文 题目：土壤的物理机械性质及其对车辆行驶性能的影响 作者： 学 号： 学院(系)： 专业： 指导教师： 评阅人： . . 中文摘要 土壤的物理机械性质及其对车辆行驶性能的影响 中文摘要 关键词：土壤的物理机械性质，车轮与地面相对滑动，轮式车辆的牵引力 土壤是工程机械的作业对象，又是其支承基础。土壤的物理机械性质直接影响工程机械的作业阻力、运行阻力，牵引性能及运行通过性。实际土壤是不同粒度土粒的混合物。不同粒度土粒的相对含量直接影响土壤的性质。 在车轮向前滚动的过程中，除了直观的向前运行的滚动之外，在车轮与地面的接触区内的各个接触点还存在着不同程度的相对滑动。通过轮与地接触面的摩擦产生驱动力，以及车轮在各接触点的径向变形的差异是产生车轮与地面相对滑动的基本原因。车轮与地面之间的相对滑动不仅影响车轮的运行速度，而且影响轮胎的磨损、能量消耗及整机的作业效率。驱动轮滚动过程中，即使＝1，即从驱动轮整体而言，它作纯滚动，则轮一地接触区内其余各点，轮与地之间仍存在着相对滑动，存在滑动摩擦。轮一地接触区内各单元面积的滑动摩擦力之总和就构成了牵引力。 . 英文摘要 Physical and mechanical properties of the soil and its effect on vehicle performance Abstract Key Words: Physical and mechanical properties of the soil ， Relative sliding wheel and the ground , Wheeled vehicle traction Soil is the object of construction machinery operations, but also the supporting base. Physical and mechanical properties of the soil directly affects the operation of construction machinery resistance, running resistance, traction performance and run through sex. Actual soil is a mixture of different size soil particles. The relative content of different size soil particles directly affect the nature of the soil. In the process of rolling the wheel forward, in addition to intuitive operation of rolling forward, the wheel contact with the ground in each region there is still a point of contact varying degrees of relative sliding.Access through the wheel and the driving force of the friction surface, and the wheels at all contact points between the radial deformation of the wheel and the ground is to produce the basic reason for the relative sliding.Wheels and the ground not only affect the relative slide between the wheel speed, but also affect tire wear, energy consumption and the machines operating efficiency.Wheel rolling process, even if = 1, from the wheel the whole, it is for pure rolling, the wheel of a point of contact with the rest of the region, between the wheel and the ground, there are still sliding, there is sliding friction.Round acces