Abstract
The operational properties of the automotive system determine the performance of the automotive system of its production functions (properties that determine the average speed, fuel consumption, traffic safety, the ability to drive on different roads and off them, and the like). The main performance properties of the automotive system are defined by the main manufacturers as dynamics, fuel economy, controllability, stability, smoothness, passability, capacity, strength, reliability, durability, suitability of the car for maintenance and repair, suitability for loading and unloading. The main characteristic of the automotive system in terms of trouble-free operation is its dynamism, which is characterized by maximum speeds of rectilinear traffic in various road conditions, as well as the ability to quickly change the speed and accident-free encounter with an obstacle. The dynamics of the automotive system includes traction and brake dynamics. Traction dynamics is determined by the maximum speeds and accelerations, and braking dynamics – the ability to quickly reduce the speed. Fuel efficiency of the automotive system is characterized by fuel consumption associated with the performance of production functions. Fuel costs make up a significant part of the cost of transportation. Therefore, the lower the fuel consumption, the cheaper the operation of the car. The controllability of the car system is characterized by its ability to change or maintain driving parameters as a result of the driver’s influence on the steering. The safety of the car largely depends on the handling. In the article the dynamics of the car wheel movement of the car system and the interaction of the wheel drive of the truck with the obstacle of the support surface is considered, which allows the process of moving the truck to subject the rolling process directly through the resistance of the obstacle surface. To this end, a physico-mathematical model of the movement of a car wheel through an obstacle of the supporting surface was proposed, which also corresponds to the movement of the wheel drive of a truck. In developing a mathematical model, we used a theorem that describes the occurrence of a kinetic moment during the impact of a car wheel in the obstacle of the support surface. Calculations and graphical dependencies were performed in Excel. The results of these calculations showed the area of most efficient rolling of the wheel drive by rotational motion. Keywords: automobile wheel, obstacle, bearing surface, car, resistance, movement, rolling.
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