This article is devoted to new approaches to modeling pneumatic processes occurring in the brake system of a train. Various methods are used to model pneumatic processes in various elements of the brake system. Thus, the Navier–Stokes equation is commonly used to model changes in the pressure in the brake line. At the same time, the models of non-stationary processes occurring in the brake line do not take into account the influence of processes in the main reservoir. Indicator diagrams or thermodynamic equations are usually used to model the operation of the air distributor. This approach has insufficient accuracy when compared with experimental studies. To date, the mathematical models used to calculate pneumatic systems have an error of 12–15
Authors research the task of aluminum plate geometric parameters at excision of surface layer material on both sides of considering billet. This allows us to use the hypothesis of the identity of the areas of the regions of considering stresses. The authors propose a nonstandard approach to residual stresses identification for different variants of removing the surface layer with researching billet into account transformations in the residual stress diagram. They take into account the transformation of the residual stress diagram type at changing the thickness of the aluminum billet. The known theoretical provisions on the type of residual stress diagram and the standard integral mathematical apparatus are the basis of the proposed approach. This allows us to build a mathematical model of changing the type of residual stress diagram depending on the thickness of the surface layer removal of the research aluminum plate. The authors research the change in the geometry of the studied workpiece taking into account the correction of the parameters of the residual stress diagram. This makes it possible to use the hypothesis of the equality of the areas of compressive and tensile residual stresses. The obtained results clarify the known theoretical provisions on changing the residual stress diagram after mechanical processing of the studied workpieces made of aluminum alloys.
The study of power supply systems under changing operating conditions is most efficiently performed using computer modeling, since such systems represent complex technical structures in which the operation of all components is closely interrelated. The operating modes of traction power supply systems of electrified railways are also strongly influenced by variations in the parameters of the external power supply system. Currently, freight traffic volumes are increasing on many lines of the Russian railways, with the most significant growth observed on the Eastern Polygon. At the same time, the equipment of traction power supply systems is characterized by considerable physical and moral wear. These factors necessitate the modernization of traction power supply systems, especially on sections with mountainous and steep-gradient track profiles. This paper presents the results of computer modeling of the power supply system of one traction power supply district of the Eastern Polygon. For this purpose, a model of the studied system was developed using the Fazonord software package. The obtained simulation results made it possible to formulate recommendations for optimal combined modernization options of the traction power supply system. These options involve the application of shunt and longitudinal reactive power compensation devices, as well as the parallel operation of traction substation power transformers supplying inter-substation zones with complex track profiles. The proposed recommendations can be extended to other mountainous sections operating under modern freight traffic conditions.
This article examines the contributions of Doctor of Historical Sciences and Professor Sergey Ilyich Kuznetsov to historical scholarship, education, and the development of international relations at Irkutsk State University. The authors highlight key stages in Kuznetsov's development as an orientalist, drawing the reader's attention to his most important publications. The article outlines the main areas of Kuznetsov's research and his results, recognized in the Russian and international academic community. It also describes Sergey Ilyich's contribution to the development of the Irkutsk State University History Department as a lecturer, administrator (dean and department head), and chairman of the dissertation council for historical sciences.
