Contacts

O. S. Valinsky, A. N. Marikin, N. P. Kalinin, E. V. Sukhanov. Implementation of an Automatic Control System to Improve the Operation Accuracy and Energy Efficiency on High-Speed Electric Trains [more] [back]

To develop and evaluate an automatic train control algorithm for high-speed trains aiming at energy efficiency, timetable accuracy and increased passenger safety and comfort. Methods: An analytical and computer-based approach was used to design an automatic control algorithm. The finite element method was used to simulate an electric train movement. The algorithm has been implemented in Python language using NumPy, Pandas and Matplotlib libraries. The Sapsan high-speed train operation data have been analysed and a comparative analysis of experimental and computational data has been carried out. Results: The automatic train control algorithm has been developed to improve energy efficiency and timetable accuracy, as well as to reduce the train driver impact on energy consumption. The effect of energy savings up to more than 11% in conditions of different traffic volumes due to the implementation of the system has been recorded. The results of the motion curve simulation compared with experimental operating data are presented. Practical significance: The implementation of the proposed automatic control algorithm will improve the energy efficiency of high-speed trains, enhance their operational characteristics, increase the train timetable accuracy and upgrade the level of passenger comfort. The developed system can be used on railways with high traffic intensity to increase railway capacity without upgrading the infrastructure. Keywords: High-speed train, automatic control system, energy efficiency, automated control, automatic control algorithm, traffic optimization, railway transport

K. V. Talantova. Use of Concrete-Based Composite Materials in Construction [more] [back]

Purpose: On reviewing some of the Internet open publications devoted to composite materials, the author understands a clear need to revisit the basic principles of their development and the formation of properties and to move away from mechanistic understanding of complex system properties as the sum of those of their components. The information on composite materials with different types of fibers and matrices including those based on concrete is widely available in the open publications. However, when presenting the results of research, authors often refer to almost all materials consisting of two or more constituent materials as composite. Methods: The proposed information has been assessed based on the analysis of the Internet open publications, leading experts in the field of construction and composite materials and the author’s experimental and theoretical studies. Results: Composite materials have been widely investigated and applied recently. Innovative design solutions using intriguing and very promising composite materials with specified (required) properties have been researched in a number of open publications and the Internet. Practical significance: In scientific publications and on the Internet pages, there is often no clear and accurate understanding of composite materials. The article attempts to draw experts’ attention to the need for the research on structures based on composite materials and bring the terms and definitions accepted in the professional community into line with their physical and technical meaning, which will allow obtaining the expected results without wasting time and money. Keywords: Composite materials, specified properties, fiber type, matrix, principles of creation, formation of properties, multicomponent materials, reinforced concrete, synergetic

A. K. Kanaev, E. V. Oparin, E. V. Oparina. Modelling Attacker Network Reconnaissance Using the Environment of an Integrated Time Scale Synchronization and Delivery System [more] [back]

To assess the security and vulnerability techniques for a complex system of time scale synchronization and delivery in case of attacker network reconnaissance in the net environment. Methods: Collection, systematization and analysis of scientific and technical information; methods of network and graph theory, mathematical modelling, and probability theory. Results: This paper presents the results of modelling attacker actions during network reconnaissance in communication networks using time-frequency support systems. A semi-Markov and simulation models of attacker behaviour were built reflecting all phases of the confrontation between an organised attacker and an information security system. The semi-Markov and simulation models make it possible to illustrate probability and time characteristics of processes reflecting the confrontation between an organized attacker and an information security system as well as to evaluate these characteristics depending on the content, quantity and quality of the resources available to the attacker and the information security system. The verification of the generated simulation model was carried out using the constructed semi-Markov model. Practical significance: The constructed models can be used to analyze the process of confrontation between information security systems and organized intruders, to assess attacker activities and those of the information security system, as well as to evaluate the time-frequency support systems judging by the results of the confrontation. The simulation results obtained can be used by information security specialists in building, modernizing, and designing security tools for time and frequency reference systems. Keywords: Telecommunication system, time-frequency support, network reconnaissance, semi-Markov model, simulation model, attack, attacker