Volume 90, Nº 10 (2019)

A solid lubricant based on molybdenum disulfide is proposed for use in reducing the wear of the contact strip in the pantograph of high-speed railroad vehicles and the overhead conductor. This article also considers the impact of MHD force generated under the influence of the lubricant and electromagnetic field in the contact zone on the characteristics of current collection such as the slide contact transient voltage and the distributed current density under the contact strip. The optimal gap between the contact strip and the overhead conductor is determined, which is conditioned by the lubricant amount supplied to the contact zone. The technique recommended on the basis of the derived equations to reduce the repulsive MHD force consists in controlling the force of pressing the additional molybdenum disulfide strip provided the electrical and mechanical losses in the contact are minimal.

A spinning detection method of a locomotive wheelset in a dc traction drive and its implementation on the basis of intelligent processing of measuring data of the drive control system is considered. An increase in the amplitudes of the low-frequency harmonics of the voltage sensor output signal on the locomotive power circuit elements is used as a sign of loss of motion stability of the wheelset due to reaching the threshold wheel–rail adhesion. For automatic multilevel identification of spinning modes, a random forest algorithm-based classifier is used. The results of the analysis of the control power circuit parameters preindicated by experts show the high sensitivity and accuracy of the proposed intelligent spinning detection system.

On the basis of an analysis of world and domestic experience, it is shown that an electrotechnical complex (EC) needs to be created for management of basic parameters in transportation process for increase of efficiency and safety of transportations and safety of the transported freights allowing one to carry out continuous control of a condition of the rolling stock and the transported freight in the real-time mode. On the basis of the formulated functional and technical requirements, an EC was developed consisting of a mechanical and electronic module providing mechanical and electronic sealing of transportation facilities. The principle of an EC based on the use of filters with finite impulse response was determined.

A generalized mathematical model of a combined electric drive of a dynamic advertising structure taking into account the impact of dynamic wind load is proposed. A plane model of wind forcing is considered and the edge of the prism of a dynamic advertising structure is approximated by a swing with moving load, the mass–dynamic characteristics of which are proportional to the moment of resistance of electric drive. The principles of regulation of a combined electric drive for the modes of positioning and changing prism sides and for tracking and emergency modes. To stabilize electric drive motion under conditions of high dynamic parameters of operating element motion, which are caused by instability of wind load, a digital model of an intellectual control system by combined electric drive with a fuzzy controller was developed that makes it possible to use an approximate signal adaptation with an additional control signal that is applied to the input of the circuit of the digital model of a combined electric drive and has a corrective effect on changes in the electric drive moment. Simulation of intelligent control systems with a certain adjustment of a fuzzy controller revealed a high quality of electric drive regulation under the conditions of an effect of dynamic wind load.