Simulation of Road Surface Impurities Taking Into Account the Smoothing Capacity of Tires

When vehicle driving on roads with different types of coverage and varying degrees of wear, there are oscillating processes that adversely affect the productivity of passengers and goods, limit speed and impair the reliability of the vehicle. Improving the car's performance requires an in-depth study of the relationship between the vehicle and the environment. At the design stage of the car, these studies are rationally carried out by simulation using calculated equivalent models of both the studied system and external influences on it. In this way, it is possible to more accurately assess the design decisions in terms of their effectiveness. Therefore, when studying the smoothness of the car must also take into account the ability of pneumatic tires to smooth out road bumps. The ability of the tire to smooth the unevenness of the road microprofile is described by the transfer function of the dynamic link in the form of a differential equation, which allows to average the ordinate of the microprofile of the bearing surface on the area of contact of the pneumatic tire with the road surface. According to the results of simulation of road roughness in the form of a random function by generating random disturbances according to the given statistical characteristics, correlation functions of ordinates of average cross section of microprofile, spectral densities of variances and values of ordinate of road roughness taking into account the ability of tires to smooth road roughness for different types That allows to increase the accuracy of calculations in the mathematical study of the car as an oscillating system, by modeling the conditions of interaction of the pneumatic tire with the bearing surface as close as possible to the real conditions of impact on the suspension of road bumps. But the most complete and reliable to determine the parameters of smoothness and choose a rational design of the suspension system of the vehicle, taking into account the operating conditions.