The vertical force applied to the road surface by vehicle can be separated into two components : the static load and fluctuating component known as dynamic tire force . it is very important for vehicle - roads interactions study to deeply analyze the regular of the load 车辆对路面的载荷并非是定值载荷,而是不断变化的动载,深入研究这种载荷的变化规律,在车辆-路面相互作用的研究中十分重要。