Mathematical Modelling of Transients in the Electric Drive of the Switch – The Main Executive Element of Railway Automation

Abstract

To develop a mathematical and imitation model of the electric drive of the railroad switch as a two-and three-mass electromechanical system based on DC and AC motors as the main executive element of railway automation. The modelling is based on the parameters of the SP-6m switches as the main modification of the executive element of the Ukrainian domestic railways automation system. Methodology. The authors have presented the mechanical part of the railroad switch as a three-mass construction scheme with serial connection of elastic masses. Special attention is paid to the character of the movement of the switch point tongues, when describing them in the form of two-and three-mass kinematic schemes, as well as to the mechanical state of the traction and connections as nodes, which are most sensitive to the negative effects of some modes of the railroad switch. Results. A simulation mathematical model of SP-6m switch for AC and DC motors, which allows to study the influence of various factors, has been developed and tested at the stand of the Automation Laboratory of the Ukrainian State University of Railway Transport, Kharkiv. The deviation in the basic parameters of the switch translation process is less than 5 %. Originality. For the first time a mathematical model of an electric drive of the railroad switch is developed, which takes into account elastic relations and load characteristics as an object of controlling the speed of movement of switch point tongues. Practical significance. We have created a mathematical model of the electric drive of the railroad switch which allows to examine the influence of various factors, including the influence of the environment on the operation of the switch. References 10, table 1, figures 10.

Mathematical modelling of transients in the electric drive of the turnout of the mono-sleeper type with switched-inductor motor

“…12. The obtained results show that in the kinematic line of the turnout there are fluctuations of the traction force, the amplitude of which in comparison with the traditional turnout has decreased by 5.5-6 times [8]. Such oscillations depend to a greater extent on the nature of the behaviour of the electromagnetic torque.…”

“…In [8] a mathematical model of the turnout SP-6m was developed, which is quite widely used in Ukraine, based on DC and AC motors.…”

“…In contrast to [8], where the kinematic line of the turnout was considered by two-mass and three-mass systems, the mechanical part of the turnout of the monosleeper type is considered as a single electromechanical system, i.e. a single-mass one (Fig.…”

The method of limitation of dynamic loads of nonlinear electromechanical systems under state vector robust control

“…Let us now consider the limitation of loads in multichannel nonlinear multi-mass systems, with robust control by the state vector with many electric drives connected through the control object [12][13][14][15]. In particular, such a problem arises in the joint control of the speeds of rotation of the upper and lower rolls with individual drive of the rolls and their mutual influence through the rolled metal.…”

“…The synthesis of such an observer (12) consists in determining the matrix of the gains of this observer. The perturbation is clearly not applied to the output of the observer and, in the synthesis of the guaranteed estimate, is determined during the synthesis of the observer for the worst case (worst -case disturbance), when the perturbation itself is a function of the state vector of the observer , so the following expression holds…”