ON THE IMPORTANCE OF ACCOUNTING THE TIRE SLIP AND THE CARRIER SYSTEM ROLL WHEN CALCULATION OF THE ROLLOVER CRITICAL SPEED FOR A CARGO VEHICLE

Abstract

One of the most important operational properties for any vehicle is stability. There are longitudinal and transverse, static and dynamic, directional and trajectory stability. Static stability characterizes the state of the vehicle during parking or movement at low speed, and dynamic stability - during rectilinear movement over bumps or during curvilinear movement. This article discusses the dynamic stability of a truck during curvilinear movement on a horizontal surface under the action of a lateral force. The author of the article notes that in many cases, when calculating the critical speed for overturning, the withdrawal of elastic tires and the roll of the carrier system are not taken into account, which in some cases leads to a significant error in the result. The slip angles and roll of the unsprung masses depend mainly on the stiffness of the tires, and the roll of the sprung masses is influenced by the characteristics and condition of the elastic elements of the suspension and shock absorbers, as well as the position of the center of gravity of the load. In the framework of this study, the need to take into account the listed parameters when assessing the dynamic transverse stability of a vehicle is substantiated. The author has developed a mathematical model for the kinematic calculation of the turn, which allows taking into account tire slip, as well as the roll of unsprung and sprung masses using the iterative approximation method. An estimate of the relative error in the calculation of the critical speed for overturning is made without taking into account and taking into account the motion parameters listed above.