Abstract
This article discusses the features of the environmental impact of wheeled vehicles on the soil and ways to reduce it. It was determined that one of the ways to reduce the harmful impact on the ground is to increase the tire contact spot and reduce the specific pressure in contact. The article discusses the main existing methods for determining the parameters of the contact spot of ultra-low pressure tires. The analysis of the considered methods is carried out, highlighting the advantages and disadvantages. Laboratory tests of the 1020x420-18 bus of the Bel-79 model used as a propellant on small-class forest tires were carried out. The research was carried out using a universal functional test bench for tires of the SIB-1M model. based on the method of static loading of the wheel with the application of an imprint of the painted area of the tire tread on a solid non-deformable platform, a series of experiments was carried out to determine the influence of the radial load and internal air pressure in the tire on the parameters of the tire contact spot. The results of the research are the dependences of the change in the shape of the contour and the actual area of the tire contact spot with the solid support axis. Approximating power functions
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