A Method of Acquiring Dynamic Road Roughness Based on Vehicle-Road Vertical Coupling

ABSTRACT

A method of acquiring dynamic road roughness was proposed. At first, road elevation data was measured and road surface spectrum was analyzed. Secondly, the simplified interaction dynamic model of quarter vehicle and the Euler- Bernoulli beam road, visco-elastic Kelvin foundation were built to obtain the wheel dynamic load. In its effect, the beam bending vibration differential equations was built, and road surface vertical displacement solution was acquired by integral transform method under the action of vehicle-road vertical coupling. These were the basis of article study and the important issues. Finally, the dynamic road roughness was analyzed by applying stochastic process theory and the linear superposition method. The conclusion was that the dynamic road roughness was linear superposition on the initial road roughness and road vertical displacement. What was proposed the concept on dynamic road roughness is an important innovation in the vehicle-road dynamics field. This method provided a more accurate road excitation in the course of the vehicle-road dynamic simulation analysis.

Keywords:

Vehicle-road vertical coupling, dynamic road roughness, quarter vehicle model, road dynamic model, integral transform method.