Dmytro Marchenko

Mykolayiv State Agrarian University · Faculty of Engineering and Energy

The methods of increasing the efficiency of internal combustion engines through heat utilization are examined. A proposed classification of heat utilization systems for mobile energy vehicles is presented. External utilization harnesses the heat generated by a diesel engine to fulfill the needs of consumers not directly related to the engine, such...

The work scientifically substantiates the use of an effective technology for increasing the wear resistance of cylindrical parts, using the example of protective sleeves of cantilever pumps, due to electromechanical surface hardening. A review of research was carried out and it was established that the achievement of the highest values of microhard...

The work scientifically substantiates the application of an effective technology for increasing the wear resistance of machine parts and tools due to complex diffusion saturation of the surface layer of parts made of iron-carbon alloys in the process of casting on gasified models based on the optimization of the composition of saturating mixtures a...

The work scientifically substantiates the application of an effective technology for increasing the wear resistance of machine parts and tools due to complex diffusion saturation of the surface layer of parts made of iron-carbon alloys in the process of casting on gasified models based on the optimization of the composition of saturating mixtures a...

The work scientifically substantiates the application of effective technology for the restoration of worn car parts by applying new electrospark coatings based on electroerosion nanomaterials. The developed technology is characterized by technological flexibility, cheapness, simplicity, does not require the use of expensive and scarce materials and...

The paper presents experimental studies and obtained statistical models of the influence of processing modes on the quality of the surface layer and cyclic durability of reinforced machine parts. It was established that the main influence on the strengthening effect, the depletion of the plasticity reserve of the metal and the formation of residual...

The article presents the results of tribological research on the most promising way to restore and increase the wear resistance of engine valves by developing a method of gas nitriding. It is established that with increasing operating time the guide bushings of the outlet connections wear out with the displacement of the axis of the forming surface...

The analysis of ploughshare wear is given in the article and the characteristic requirements to the technological process of restoration of their worn surfaces are established. The choice of restoration technology was justified taking into account the nature of defects and the degree of wear of the working surfaces of cutting elements, their materi...

Rolling bearings are used as support units in almost all modern transport and technological machines. Bearing units largely determine the durability of the machine as a whole. The main cause of bearing failure is wear of bearing parts due to slippage. The quantity of slip is needed to calculate the friction path in predicting wear. The paper deals...

The analysis of tribological researches on the most perspective way of restoration of a primary resource of engines by means of a gas-dynamic spraying is resulted in article. It was found that to reduce the coefficient of friction and increase the wear resistance of the coating is theoretically justified the use of copper-zinc powders brand C-01-11...

This paper considers the technology of electrical discharge machining of steel friction pairs and reports the results of experimental studies. Analysis of the experimental studies has shown that increasing the "anode-cathode" voltage leads to a sharp decrease in the micro-hardness of the surface layer. The study has also made it possible to determi...

In most studies in recent years on the problems of assessing the level of professional training of teachers, including foreign language teachers, as the main criterion characteristic of this phenomenon is professional competence. It is a rather complex integrative psychological and pedagogical phenomenon, which contains, according to various resear...

The analysis of tribological researches on the most perspective way of restoration of a primary resource of engines by means of a gas-dynamic spraying is resulted in article. It was found that to reduce the coefficient of friction and increase the wear resistance of the coating is theoretically justified the use of copper-zinc powders brand C-01-11...

In our research activities at the initial stage we consider the method of social diagnosis, the most successful of which involves clarification of all the circumstances of its results. We used this method when undergoing socio-pedagogical practice in a special (correctional) boarding school. " The social pedagogue of this institution considers work...

Mankind has entered the 21st century of a new era marked by continuous informatization and computerization, the globalization of production, capital, culture and education, a reassessment of what has been achieved, and powerful unpredictable and uncontrolled catastrophic events in nature. One of the most effective means of human adaptation to moder...

The article analyzes the research aimed at the use of various materials, additives and additives to oils. It is established that their application is mainly limited to the stages of operation, bench and operational running-in. The use of antifriction materials at the stage of processing the parts of internal combustion engines, limiting the resourc...

The article considers the technology of electroerosive treatment of steel friction pairs and presents the results of experimental studies. Analysis of experimental studies has shown that an increase in the anode-cathode voltage leads to a sharp decrease in the microhardness of the surface layer. The study also allowed to determine the characteristi...

The article discusses the method of surface plastic deformation of steel parts by smoothing. The positive influence of this method on the wear resistance of the tool has been established under conditions of intense wear and with abundant lubrication.

The article discusses the method of surface plastic deformation of steel parts by rolling them with rollers. The positive effect of this method on the wear resistance of friction pairs under conditions of intense abrasive wear and with abundant lubrication has been established.

The article presents studies of dynamic processes that occur during an electrohydropulse discharge. A method and design of a device for hardening parts by an electrohydropulse high-voltage discharge in a liquid has been developed. The proposed method allows to obtain a depth of the hardened layer up to 30 mm with compressive stresses throughout its...

The physical mechanisms have been investigated that form and transform the corpuscular-vortex-wave thermal complexes of disturbances in contact tribosystems based on the quantum-mechanical exchange interaction. The presence of a contact gap determines the generation of pairs of quasi-particles-disturbances stabilized by wavelength and frequency. In...

The article provides a review of information materials on the effectiveness of surface plastic deformation in order to increase the wear resistance of friction pairs. The analysis revealed that the increase in the wear resistance of parts by surface plastic deformation is significantly affected by the stabilization of the rolling forces, as well as...

The study proposes the form of the wear law for two factors, contact pressure and sliding speed, taking into account the properties of lubricants and structural materials. By solving inverse wear contact problems for three contact schemes—four-balls, ball–ring, and cone–ring—calculation formulas were obtained for identifying the parameters of the w...

The article presents the results of a study of the contact strength of V-belt pulleys when they work on contact collapse. To increase the wear resistance and contact strength of the tribological conjugation, a method for rolling around the side surfaces of pulleys with a roller and a device for its implementation are proposed. The proposed method a...

This article presents the results of experimental studies on the rolling of parts that are subject to wear and tear by rollers. The physical and mechanical properties and the microstructure of the surface layer of steel parts hardened by rollers were studied. The wear resistance characteristics of the specimens treated by rollers were obtained. A m...

The problem of developing a calculation-experimental method for calculating wear of a sliding bearing based on a two-factor wear model (contact pressure - sliding velocity) with identification of wear resistance parameters was considered. On the basis of the proposed wear model, the wear-contact problem for a cylindrical sliding bearing was solved....

The article deals with findings of experimental research on the running-in process of steel pieces with rollers that harden the contact strength. The hardening effectiveness of steel pieces physically simulates the bearing strain process, the physical and mechanical properties of the surface layer and its microstructure, and the diffusion of chemic...

A bevel gear consists of bevel drive and driven wheels with straight teeth, these are in engagement one with another. The generatrixes of the side surfaces of the drive bevel wheel teeth are arranged as curvilinear, as arcs of a circle with radius , that is found from the formula , where - length of a tooth (width of face); - parameter of curvature...