Rationale for selecting a method for determining parameters of the contact spot of pneumatic wheel mover with support base

The existing theoretical method of assessing the contour area of the tire contact spot by the mathematical model of V. L. Biederman through the determination of the parameters of the universal characteristics of the tire (UCT) provides an indicator of the ply rate, which in connection with the introduction of modern tires no longer reflect the accepted relationship - the greater the ply rate, the higher the tire stiffness. Therefore, when calculating the contour area of the tire contact spot, an error of up to 28% is possible. In this connection, we have conducted exploratory experiments specifying the theoretical method for calculating the contact patch for modern tires. In this connection, we conducted search experiments clarifying the theoretical method of calculating the contact spot for modern tires and offers a comparative assessment of the four ways to determine the area of the contact spot tire: 1) directly by measuring the area using a digital photograph of the imprint of a contact tire in the Kompas-3D V13 program environment with scaling and method errors using a 100×100 mm square; 2) by calculation according to the formula of the area of the ellipse (hereinafter - according to the formula), using the length and width of the contact patch of the tire, measured by a tape measure directly from the received imprint; 3) by calculation using the formula, using the length and width of the tire contact patch, determined from its digital photograph in the Kompas-3D V13 software environment; 4) by the formula, using the length and width of the contact patch of the tire, determined by calculation using the UCT parameters...