Volume 6, Nº 3 (2019)

The work is devoted to the development of technological modes of strengthening of the band steel of locomotive wheels by the method of thermal treatment with concentrated energy flow. Thermal treatment of the banding steel was carried out on a solar furnace at flow densities 320, 450 and 500 W/sm2. Quenching was carried out in air and water. Heating and cooling rates are important for quenching. If speed of cooling is less than critical speed ( V cr ≈ 50 deg/s), quenching is not observed. The hardness of the tempered steel samples after thermal treatment at a temperature of 800-1200°C and treated in water reaches ≈726 HB, that is not optimum for bandage steel.The optimum temperature for quenching the band steel is 730-780°C at a flow density of 450 W/sm2. At the heating temperature of the steel samples 730-780°C and cooling by quenching into water, the hardness of the band steel is the required value of 350-400 HB. By changing the heating temperature and cooling rate of the steel, a predetermined hardness can be controlled and obtained.

The article studies the kinematics of elastic-plastic deformation of hollow steel profiles. The aim of the work was to improve the power characteristics of the processes of plastic deformation of energy-absorbing structural elements of the hollow profile of vehicles and to increase the passive safety and reliability of equipment. Finite element modeling of kinematics of processes with control of parameters of energy absorption of steel pipes of various cross sections was carried out. The results of virtual studies of bending and precipitation at the end of a number of hollow profiles in the form of pipes of different sections have shown ample opportunities to control the process of mechanical energy absorption by selecting the design of pipes, control the results of modeling the absorbed energy and the maximum effort on the indicator diagram of the deformation process.

This paper presents the results of studies on the influence of thermodynamic and physico-chemical properties of individual flux-oxides on the energy efficiency of the arc A-TIG welding of stainless steel CrNi18-10. The obtained results of the research allowed to reveal the criteria for evaluating the energy efficiency of the arc A-TIG welding on the depth of penetration of the welded metal and to determine the impact of thermodynamic and physico-chemical properties of individual flux oxides on the energy efficiency of the penetration capability of the welding arc for different welding energies. The requirements to thermodynamic and physico-chemical properties of individual fluxes-oxides are also revealed, which provide high energy efficiency of arc penetration capability during A-TIG welding.

The article presents an approach to planning the organization of production, in which the increase in productivity can be considered as a result of the implementation of predictive models of data Analytics and forecasting of events at each level of planning. Considered and justified mathematical model of optimization of resources of the enterprise, implemented in a three- tier system adaptive planning with the formation of indicators, optimization of production and allowing it to form the most effective scenarios of solving the problem maximize performance subject to qualitative changes in the organization of production related scientific and technical progress and forecasting trends. The formulated conceptual apparatus allows us to consider productivity as a function that reflects the impact on the production system of modern methods of planning and information technologies of production organization in time, which significantly expands the possibilities of theoretical research in the field of production organization. The three-level system of adaptive planning described in this article contributes to the development of the theory of optimizing the use of enterprise resources and the organization of efficient production. The application of the approach to adaptive planning of production organization presented in the article allows to expand the range of solutions to improve the productivity of enterprises by promptly responding to changes in its performance using modern technologies of lean and digital production.

The Concept of competitive value chains in production systems, as an institutional structure operating on network principles, was the impetus for the development of a system of models of inter-industry digital platform for the management and optimization of cooperation of high-tech network production systems. The article describes the ways of integration into business processes of production systems of simulation and cognitive models. The practical implementation of the system of these models is a separate software product - an interdisciplinary digital platform for participants in the creation of new high-tech products and their components.

The work is directed to numerical simulation of quantum dots spectrum for molecular nanostructure of small size for creation of new nanotechnology. Quantum dots are the small peaces of semiconductor which presents the molecular system heterostucture. The cariers of charge are confined in small region. The main acsent is made on development of effective method for determination of eigenfuncions and eigenvalues of quantum dot. Quantum dots are used in nanoelectronics, in bio-sensors of nanosize, and in the systems of medical diagnostics of high precision.

One of the ways to achieve safety and comfort is to improve on-board air conditioning systems.The use of air cooling machine determines the air pressure high level at the point of selection from the aircraft engine compressor. Because of the aircraft operation in different modes and especially in the modes of small gas engines, deliberately high stages of selection have to be used for ensuring proper operation of the refrigeration machine in the modes of the aircraft small gas engines. Into force of this, most modes of aircraft operation have to throttle the pressure of the selected stage of selection, which, together with the low efficiency of the air cycle cooling system, makes the currently used air conditioning systems energy inefficient.A key feature of the architecture without air extraction from the main engines compressors is the use of electric drive compressors as a source of compressed air.A comparative analysis of competing variants of on-board air conditioning system without air extraction from engines for longrange aircraft projects was performed at the Moscow Aviation Institute (National Research University).The article deals with the main approaches to the decision-making process on the appearance of a promising aircraft on-board air conditioning system at the stage of its conceptual design and formulated the basic requirements for the structure of a complex criterion at different life cycle stages.The level of technical and technological risk, together with a larger installation weight, will require significant costs for development, testing, debugging and subsequent implementation, but at the same time on-board air conditioning system scheme without air extraction from the engines will achieve a significant increase in fuel efficiency at the level of the entire aircraft.

The aim of this work is to study the effect of pulsed IR radiation generated by functional ceramics and cavitation on the processes of sedimentation and coagulation of extremely fine fractions. It is shown that these methods are complementary for solving technological problems.

In paper electrode materials with palladium nanoparticles on polymer matrix substrates for energy sources have been formed. Nanocomposites were investigated by atomic force and scanning electron microscopy. The catalytic activity of formed electrodes in the formic acid oxidation reaction was evaluated by voltammetry method.

The paper presents an optimized manufacturing technology of silicon diffusion n-p detectors, as well as some research data on the spectrometric characteristics of silicon diffusion detectors of charged particles.