Dynamic Analysis of Special Cars on Uneven Roads

Abstract

The method of the dynamic analysis of special cars with a high gravity centre is presented in this article. The method proposed by the authors includes a comprehensive mathematical model of the car, and this model is supplemented with the models of uneven road surface, algorithms to determine the contact point between the tire and the road surface, and programs to perform computer simulations. In the article the mathematical model of the cooperation between road surface and tires are discussed in details. As it is known the road acts on the tire in a form of the reaction forces which should be applied in the concrete point named "contact point C". Thus, it is very important to determine this point location correctly. For this purpose the special mathematical models of the road surface and the algorithms to define the contact point location are developed. Two mathematical models of the road are discussedcontinuous and discrete one. Two algorithms to find the location of the contact point are presented, as well. According to the conception of the authors names of the algorithms refer to the essence of the matter of the procedures assumed. The first of themnamed Planecan be used considering the continuous model of the surface, and the secondnamed 4Pointsin the case of the discrete model of this surface.