INVESTIGATION OF FORCED OSCILLATIONS IN A NONLINEAR SYSTEM OF AN INDIVIDUAL TRACTION ELECTRIC DRIVE

Abstract

Justification. The processes taking place in the traction electric drive-wheel-road system during acceleration, braking cause increased dynamic loads on the drive elements, which can lead to their failure. Therefore, it is important to control the drive in such a way as to minimize and suppress these processes, for which the control system must be equipped with an observer of the moment of resistance on the motor shaft. Among other things, increased interest in any systems is caused by the study of the occurrence of resonant phenomena, which are accompanied by a sharp increase in oscillation amplitudes. Therefore, it is necessary to investigate the features of oscillatory phenomena in this nonlinear system.The purpose of the work is to determine the features of oscillatory processes arising and to study the possibilities of the origin of resonant phenomena in the "traction electric motor – wheel" system.optimal laws of automatic control of the engine and transmission of a wheeled agricultural tractor in various operating modes using a digital model of the tractor transmission.Materials and methods. The study of the features of oscillatory processes arising and the study of the possibilities of the origin of resonant phenomena is carried out by analyzing systems of differential equations describing the functioning of a nonlinear system.Results. The features of oscillatory phenomena in nonlinear systems are considered, as well as the possibility of occurrence of resonant phenomena. It can be said that the resonant frequency of a nonlinear system is some limiting characteristic of it, to which the system can strive, but cannot achieve it due to its phase instability. In a nonlinear system with one degree of freedom, only one near-resonant mode can occur at frequencies close to its resonant frequency, if the phase instability of the elastic, inertia and resistance forces will manifest itself insignificantly. There can be no other resonant subharmonic, superharmonic and combinational modes in a nonlinear systemConclusion. The practical value of the study lies in the possibility of using the proposed conclusions in the development of traction electric drive units and in the synthesis of vehicle traffic control systems