EFFECT OF AIR ATOMIZATION PRESSURE AT HIGH-SPEED SPRAYING OF GAS-THERMAL COATING FROM HIGH-CHROMIUM STEEL ON ITS CONSTRUCTION AND WEAR RESISTANCE

ASTRASHAB Evgeniy V., Technical Expert of the Center of Structural Research and Tribo-Mechanical Testing of Materials and Mechanical Engineering Products, Joint Institute of Mechanical Engineering of the NAS of Belarus, Minsk, Republic of Belarus

BELOTSERKOVSKY Marat А., D. Sc. in Eng., Assoc. Prof., Head of the Laboratory of Gas-Thermal Methods of Machine Components Hardening, Joint Institute of Mechanical Engineering of the NAS of Belarus, Minsk, Republic of Belarus, This email address is being protected from spambots. You need JavaScript enabled to view it.">This email address is being protected from spambots. You need JavaScript enabled to view it.

GRIGORCHIK Alexander N., Ph. D. in Eng., Senior Researcher of the Center of Structural Research and Tribo-Mechanical Testing of Materials and Mechanical Engineering Products, Joint Institute of Mechanical Engineering of the NAS of Belarus, Minsk, Republic of Belarus

KUKAREKO Vladimir A., D. Sc. in Phys. and Math., Prof., Chief of the Center of Structural Research and Tribo-Mechanical Testing of Materials and Mechanical Engineering Products, Joint Institute of Mechanical Engineering of the NAS of Belarus, Minsk, Republic of Belarus, This email address is being protected from spambots. You need JavaScript enabled to view it.">This email address is being protected from spambots. You need JavaScript enabled to view it.

SOSNOVSKIY Aleksey V., Ph. D. in Eng., Leading Researcher of the Laboratory of Gas-Thermal Methods of Machine Components Hardening, Joint Institute of Mechanical Engineering of the NAS of Belarus, Minsk, Republic of Belarus

The influence of the pressure of the atomizing air at high-speed spraying of the gas-thermal coating from high-chromium steel 20Kh13 on the structure and wear resistance of the coating is studied. It is shown that sprayed gas-thermal coatings from 20Kh13 steel in the phase composition contain α-Fe and Fe₃O₄ and FeO oxides. It is established that with an increase in the pressure of air supply used to burn the MPS gas from 0.1 to 0.3 MPa, with gas-thermal spraying, the amount of oxides increases from ≈8 to ≈15 vol.%, and the porosity of coatings decreases from 5.0 to 2.5 vol.%. The hardness of sprayed coatings from 20Kh13 steel increases with air pressure from 220 to 320 HV 10. The increase in hardness of coatings with increasing air pressure is associated with an increase in the volume fraction of Fe₃O₄ and FeO oxides contained in the coatings. The intensity of mass wear under conditions of dry friction of a gas-thermal coating of 20Kh13 steel sprayed with a minimum air pressure of 0.1 MPa, under conditions of dry friction is 20.2 ∙ 10^–3 mg/m. The increase in air pressure up to 0.3 MPa leads to the decrease in wear resistance of coatings by 1.4 times, which is associated with the increase in the number of brittle oxides in coatings. The intensity of linear wear in the I-20 lubricant of coatings obtained at a minimum pressure of spraying air of 0.1 MPa is 0.255 ∙ 10^–9. With the increase in air pressure during spraying up to 0.3 MPa, the wear resistance of coatings under conditions of boundary friction increases by ≈1.3 times, which is caused by the increase in the durometric properties of coatings.

high-speed metallization, air pressure, structure, phase composition, oxide content, porosity, microhardness, wear resistance

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CALCULATION METHODOLOGY OF THE NATURAL FREQUENCIES AND MODES OF MECHANICAL SYSTEMS OF AN ARBITRARY STRUCTURE WITH A PLURALITY OF POSSIBLE STATES

ALGIN Vladimir B., D. Sc. in Eng., Prof., Deputy Director General for Research, Joint Institute of Mechanical Engineering of the NAS of Belarus, Minsk, Republic of Belarus, This email address is being protected from spambots. You need JavaScript enabled to view it.">This email address is being protected from spambots. You need JavaScript enabled to view it.

GOMAN Arkadiy M., Ph. D. in Eng., Assoc. Prof., Head of the Department of Dynamic Analysis and Vibration Diagnostics of Machines, Joint Institute of Mechanical Engineering of the NAS of Belarus, Minsk, Republic of Belarus, This email address is being protected from spambots. You need JavaScript enabled to view it.">This email address is being protected from spambots. You need JavaScript enabled to view it.

SHPORTKO Vladimir V., Junior Researcher of the Department of Dynamic Analysis and Vibration Diagnostics of Machines, Joint Institute of Mechanical Engineering of the NAS of Belarus, Minsk, Republic of Belarus, This email address is being protected from spambots. You need JavaScript enabled to view it.">This email address is being protected from spambots. You need JavaScript enabled to view it.

LOGVINETS Tatyana S., Junior Researcher of the Department of Dynamic Analysis and Vibration Diagnostics of Machines, Joint Institute of Mechanical Engineering of the NAS of Belarus, Minsk, Republic of Belarus, This email address is being protected from spambots. You need JavaScript enabled to view it.">This email address is being protected from spambots. You need JavaScript enabled to view it.

Methodical approaches to determination of the natural frequencies and modes of transmissions of mobile machines and similar to them badly conditioned systems with a wide natural frequencies spectrum and a plurality of states are considered. The problem is solved in a general formulation taking into account the characteristic features of the transmission in its schematization. The calculation is reduced to the computation of eigenvalues and eigenvectors of a matrix of a special form. An approach based on the preliminary matrix symmetrization and the application of the iterative numerical method of Jacobi rotations is used. This allows to evaluate all natural frequencies and modes of badly conditioned systems with a very high precision. The process of the system stiffness matrix forming is automated by means of replacing the absolutely rigid links (if any) with links with finite stiffness. To form the equations of natural oscillations of systems with a plurality of possible states, the use of the state indicators of devices with variable structure is suggested. That approach allows to obtain universal equations describing the system motion for its any possible state. Based on the developed methodology, a computer program was created and registered, an  example with its application is given.

transmission, natural frequencies and modes, methodology, mechanical system with a plurality of possible states, state indicator

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SURFACE ENGINEERING INNOVATIVE TECHNOLOGY FOR THE REPAIR AND PROTECTION OF SHIPS PARTS

KIM Weon-Woong, President, Cosmos Metallizing Co. Ltd, Gyeongnam, Republic of Korea, This email address is being protected from spambots. You need JavaScript enabled to view it.">This email address is being protected from spambots. You need JavaScript enabled to view it.

The article describes the methods used for 30 years in the company Cosmos Metallizing Co. Ltd (South Korea) to restore parts of marine vessels. Experience has shown that the repair company should have a whole set of methods and appropriate equipment, since it is impossible to use only one or two technologies. Examples of repair and restoration of various parts of sea transport are given.

restoration and protection of parts, gas-thermal spraying, high-speed spraying, electric arc metallization, hypersonic metallization, wear resistance, hardness

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ESSENTIAL FUNCTIONALITIES OF ERA-NET ELECTRIC MOBILITY EUROPE PLATON PROJECT

ALGIN Vladimir B., D. Sc. in Eng., Prof., Deputy Director General for Research, Joint Institute of Mechanical Engineering of the NAS of Belarus, Minsk, Republic of Belarus, This email address is being protected from spambots. You need JavaScript enabled to view it.">This email address is being protected from spambots. You need JavaScript enabled to view it.

CZOGALLA Olaf, Senior Engineer – Intelligent Transport Systems, Institut f. Automation und Kommunikation, Magdeburg, Germany, This email address is being protected from spambots. You need JavaScript enabled to view it.

KOVALYOV Mikhail Ya., Corresponding Member of NAS of Belarus, Deputy Director General for Research, United Institute of Informatics Problems of the NAS of Belarus, Minsk, Republic of Belarus, This email address is being protected from spambots. You need JavaScript enabled to view it.">This email address is being protected from spambots. You need JavaScript enabled to view it.

KRAWIEC Krzysztof, Ph. D., Assistant Professor, Silesian University of Technology, Katowice, Poland, This email address is being protected from spambots. You need JavaScript enabled to view it.">This email address is being protected from spambots. You need JavaScript enabled to view it.

CHISTOV Sergey, Deputy Chief Designer, Scientific and Technical Production Center “Belkommunmash”, Minsk, Republic of Belarus, This email address is being protected from spambots. You need JavaScript enabled to view it.">This email address is being protected from spambots. You need JavaScript enabled to view it.

The paper is an extension of the same name plenary report at the conference “Innovations in mechanical engineering-2018”, which has been held in Minsk, Belarus, on September 18–19, 2018. Essential functionalities of the project PLATON (Planning Process and Tool for Step-by-Step Conversion of the Conventional or Mixed Bus Fleet to a 100% Electric Bus Fleet) are presented. Paper covers the following topics: 1) Introduction with a  brief overview of approaches to assessing the efficiency of urban transport, 2) General information on PLATON project, 3) Motivations and hindering arguments for bus fleet transition, 4) Strategic backgrounds from the public transport operators point of  view, 5) Dependences between entities of various domains in the process of electric bus deployment, 6)   Basic stages in creating electric buses fleet and initial data problem, 7) Modelling: using different kind of modelling, 8) Optimization problem and 9) Conclusions. The project PLATON has received funding from the ERA-NET COFUND Electric Mobility Europe within the Horizon 2020 program. Project runtime is 01.2018-06.2020.

urban buses, conversion, electric bus fleet, project PLATON, functionalitiesa

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