EXPERIMENTAL STUDIES OF THE INFLUENCE OF SEPARATE TIRE PRESSURE REGULATION ON THE BEARING MOBILITY PARAMETERS OF AUTOMOTIVE VEHICLES
DOI:
https://doi.org/10.32718/agroengineering2025.29.64-69Keywords:
vehicle mobility, off-road conditions, tire inflation pressure, separate pressure regulation, tire–soil interaction, cone index, vehicle speed, UAZ-469Abstract
The article addresses the problem of improving the mobility of off-road wheeled vehicles under operating conditions on non-uniform supporting surfaces characterized by varying rolling resistance and traction levels. It is shown that tire inflation pressure is a key controllable factor determining the efficiency of tire–soil interaction, as it directly affects radial deformation, contact patch area, rut depth, energy losses, and permissible vehicle speed. It is substantiated that the use of centralized tire pressure regulation systems does not allow the full mobility potential to be realized due to different operating conditions of the front and rear axle wheels, which move over soil with varying degrees of compaction.
The study aims to experimentally determine the speed performance of a four-wheel-drive UAZ-469 vehicle at various tire inflation pressures and assess the adequacy of a vehicle motion mathematical model developed in the MATLAB Simulink environment for off-road conditions. Experimental investigations were carried out on a natural sandy off-road test section with a preliminary evaluation of the physical and mechanical properties of the supporting surface using the cone index (CI) determination method in accordance with the WES and MMP standards.
During the tests, measurements of soil cone index, tire inflation pressure, tire radial deformation, maximum vehicle speed, and distance traveled were performed using a synchronized measurement system. The obtained results demonstrated that separate tire pressure regulation provides an increase in the maximum off-road speed by 15–20% compared to centralized regulation, as well as an improvement in mobility indicators according to the WES and MMP methodologies. The research results confirm the feasibility of individual tire pressure selection for each axle as an effective means of enhancing the mobility of wheeled vehicles.
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