MATHEMATICAL MODEL FOR RESEARCHING THE STABILITY OF ROAD TRAINS DURING BRAKING MODES
DOI:
https://doi.org/10.32718/agroengineering2025.29.179-184Keywords:
mathematical model, stability, braking, truck-trailer combination, axle misalignment, braking forcesAbstract
The article analyzes the braking dynamics of two-link articulated road trains. This is because two-link road trains have become widespread and form the basis of the vehicle fleets of most logistics companies in Ukraine and abroad. For their maximum efficient use, it is necessary to ensure compliance with the main operational properties that determine traffic safety. Improvement of the operational characteristics of road trains is achieved through a comprehensive study of real operating conditions and consideration of changes occurring in vehicle systems under the influence of operating factors. At the same time, significant attention must be paid to changes occurring in the running gear and braking systems of road trains, since changes in the geometric characteristics of the chassis directly affect their force, kinematic, and stiffness properties. The presence of axle misalignment in road trains leads to changes in the distribution of reaction forces at the tire–road contact patches. As a result, the braking characteristics of road trains change, which directly depend on the nature of wheel–road interaction and may cause a deterioration in vehicle stability. The study investigates two-link semi-trailer combinations consisting of a two-axle tractor and a three-axle semi-trailer equipped with non-steering axles. The equations of motion for the road train during braking modes, which consider the axle installation angles of the semi-trailer and the magnitude of braking forces acting on the wheels of the trailer unit, enable the determination of wheel deviation angles and kinematic parameters essential for solving the system of differential equations.
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