2(32)2020 from 06/26/2020

 

PHYSICAL AND MATHEMATICAL SCIENCES

 

Evsikov, I.D., Popikov, P.I., Kamalova, N.S. Substantiation of the axioms of the formalized model of the movement of the boom of a timber-carrying manipulator // Voronezh Scientific and Technical Bulletin. - 2020. - V. 2, No. 2 (32). - pp. 4-10. Access mode: http://vestnikvglta.ru/arhiv/2020/2-32-2020/4-10.pdf - Head. from the screen.

 

Abstract: Modern technologies use several criteria for the efficiency of the work processes of hydraulic manipulators. One of the criteria for technical efficiency is energy consumption and a decrease in the dynamic load of work processes. The cost of scientific research is significantly reduced by conducting model tests, which are based on well-known physical and mathematical equations. To formulate the basic axioms of the formal model, the paper uses the equations of motion of the boom, taking into account the impact of inertia forces and compliance of the hydraulic drive. Within the framework of this approach, it is possible to simulate, for example, the time dependence of high-frequency pressure fluctuations when using a damper in the piston and rod cavities or to calculate the peak pressure value depending on the diameter of the throttling channels.

 

Key words: formalized model, equation of motion, formalized model axioms, software package, homeostatic modeling principles.

 

Lisitsyn, V. I. Thermodynamic approach to modeling the growth dynamics of forest stands / V. I. Lisitsyn, N. Yu. Evsikova, N. S. Kamalova // Voronezh Scientific and Technical Bulletin. - 2020. - V. 2, No. 2 (32). - P. 11-17. Access mode: http://vestnikvglta.ru/arhiv/2020/2-32-2020/11-17.pdf - Head. from the screen.

 

Abstract: Modeling of ecosystems is an actual method for predicting their state and preventing catastrophic situations. Most forest biocenoses are modeled as thermodynamically open systems. The paper analyzes the Bertalanffy model when constructing growth curves for single-species forest stands using the thermodynamic theory of open ecological systems.

 

Key words: ecosystems, modeling, growth dynamics, single-species even-aged forest stand.

 

Emelianenko, I. N. System analysis in the design of enterprises in the import substitution sector / I. N. Emelianenko, K. A. Litvinova, N. S. Kamalova // Voronezh Scientific and Technical Bulletin. - 2020. - Vol. 2, No. 2 (32). - S. 18-25. Access mode: http://vestnikvglta.ru/arhiv/2020/2-32-2020/18-25.pdf - Head. from the screen.

 

Abstract: The paper demonstrates the possibilities of using formalized modeling in the problems of making a decision on the profitability of a project in the field of import substitution. The model forms the volume of production, selling prices and the level of profit. The value of the parameters determines the benchmarking variables that allow you to make a decision on project financing depending on the selected criteria. The model also allows you to determine the level of profit, taking into account fluctuations in demand.

 

Key words: systems approach, homeostatic modeling, decision making, comparative analysis, comparison criteria.

 

Shodikulova, F. B. Application of system analysis to study the conditions of profitability of a small private enterprise / F. B. Shodikulova, N. R. Kamalov, N. Yu. Evsikova // Voronezh Scientific and Technical Bulletin. - 2020. - V. 2, No. 2 (32). - S. 26-32. Access mode: http://vestnikvglta.ru/arhiv/2020/2-32-2020/26-32.pdf - Head. from the screen.

 

Abstract: The paper shows the possibilities that homeostatic modeling provides in the study of the profitability of a small private enterprise project in the preschool education sector. The model generates axiomatics based on verbal representations, is implemented using embedded spreadsheets and allows you to evaluate the monthly plan for the provision of services, following the chosen pricing policy, subject to mandatory profitability. The model can be developed by inserting blocks with market segment estimates and demand fluctuations.

 

Key words: system approach, formalized modeling, profitability analysis, enterprise project, model axiomatics, conditional statements

 

Uskov, V. I. Solution of the Cauchy problem for a first-order partial differential equation in a Banach space / V. I. Uskov // Voronezh Scientific and Technical Bulletin. - 2020. - V. 2, No. 2 (32). – P. 33-38. Mode access: http://vestnikvglta.ru/arhiv/2020/2-32-2020/33-38.pdf - Head. from the screen.

 

Abstract: We consider a first-order partial differential equation given in a Banach space. A solution of the Cauchy problem for a scalar analog is obtained. Next, we study a special case of an operator coefficient that has eigenvalues ​​of unit algebraic multiplicity. Then the Cauchy problem with an arbitrary bounded operator coefficient is considered. In all cases, an analytical solution formula is obtained.

 

Key words: partial differential equation, first order, Banach space, Cauchy problem, scalar equation, solution.

 

Smirnova, E. V. Finding the positional optimal control in the approach problem / E. V. Smirnova // Voronezh Scientific and Technical Bulletin. - 2020. - V. 2, No. 2 (32). – S. 39-48. Access mode: http://vestnikvglta.ru/arhiv/2020/2-32-2020/39-48.pdf - Head. from the screen.

 

Abstract: The article studies a linear-quadratic optimal control problem, in which the requirement is put forward for the convergence of two continuous processes at fixed intermediate points. A method is given for finding a positional optimal control that allows one to avoid solving boundary value problems.

 

Key words: linear-quadratic optimal control problem, positional control, Riccati equation.

 

TECHNICAL SCIENCE

 

Nikonov, V. O. Analysis of the conditions and evaluation of the effectiveness of the use of timber vehicles in the Russian Federation at the present stage of its development / V. O. Nikonov, V. I. Posmetiev // Voronezh Scientific and Technical Bulletin. - 2020. - V. 2, No. 2 (32). – S. 49-73. Access mode: http://vestnikvglta.ru/arhiv/2020/2-32-2020/49-73.pdf - Head. from the screen.

 

Annotation: The article deals with the main defects and single obstacles that occur on a logging road. The influence of these defects and obstacles on logging vehicles during their overcoming is described. The consequences of the operation of logging vehicles on low-quality logging roads are given. A promising direction for increasing the efficiency of the functioning of timber vehicles is substantiated.

 

Key words: logging vehicles, timber hauling, logging roads, performance efficiency, defects, obstacles.

 

Nikonov, V. O., Posmetiev V. I., Avdyukhin A. V. Assessment of the condition of logging roads in the Russian Federation used for the removal of timber by road transport // Voronezh Scientific and Technical Bulletin. - 2020. - V. 2, No. 2 (32). - S. 74-84. Access mode: http://vestnikvglta.ru/arhiv/2020/2-32-2020/74-84.pdf - Head. from the screen.

 

Annotation: The article provides a description of the current state of logging roads in the Russian Federation, as well as their role and place of logging road transport in the technological process of logging. The main reasons for the insufficient maintenance and poor condition of existing logging roads are considered. The types and types of forest road surfaces that currently exist and new ones being created during construction are described. The influence of the low quality of logging roads on the performance indicators of the functioning of logging road transport is considered. A promising scientific direction has been proposed, which makes it possible to increase the efficiency of logging road transport and reduce the gap between the requirements for it and the quality of logging roads.

 

Key words: logging road transport, logging road, timber hauling, road defects, efficiency, fuel consumption.

 

Posmetiev, V. I. Analysis of the design features of hydropneumatic suspensions used in wheeled vehicles / V. I. Posmetiev, V. O. Nikonov, A. V. Nabokin // Voronezh scientific- technical bulletin. - 2020. - V. 2, No. 2 (32). - S. 85-108.

 

Access mode: http://vestnikvglta.ru/arhiv/2020/2-32-2020/85-108.pdf - Head. from the screen. Abstract: The article analyzes various designs of hydropneumatic suspensions for vehicles based on foreign patent materials. Their main disadvantages are identified, important advantages are described, their schematic solutions are presented with a description of the main structural elements. To eliminate the identified shortcomings, promising kinematic schemes of independent suspensions of various types with a hydraulic drive of the steered wheel are proposed. The important advantages of suspensions of this type are described, as well as the prospects for their use.

 

Key words: vehicle, timber vehicle, hydropneumatic suspension, hydraulic energy recovery, design, kinematic scheme, modular design.

 

Anikin, N. V. Ways of solving problems in the organization of urban traffic / N. V. Anikin, K. P. Andreev, V. V. Terentiev // Voronezh Scientific and Technical Bulletin. - 2020. - V. 2, No. 2 (32). - S. 109-119. Access mode: http://vestnikvglta.ru/arhiv/2020/2-32-2020/109-119.pdf - Head. from the screen.

 

Abstract: Economic growth and rising living standards are the most important factors influencing the growth of transport mobility in various countries. The transport mobility of the population is steadily high even now. The number of different modes of transport and the level of motorization guarantee the transport mobility of citizens, but at the same time, an increase in traffic creates congestion and delays at interchanges, since the development of transport infrastructure does not keep pace with the growth in the level of motorization. Therefore, it is very important to analyze the communication system in the city in question in order to identify common problems and suggest ways to solve them.

 

Key words: traffic jams, traffic volume, communication system, motorization level, control systems.

 

Samorodov, A. S. Samorodov, T. V. Melkumova, N. V. Anikin, E. S. Karpov, Research of pedestrian crossings // Voronezh Scientific and Technical Bulletin. - 2020. - V. 2, No. 2 (32). - S. 120-127. Access mode : http://vestnikvglta.ru/arhiv/2020/2-32-2020/120-127.pdf - Head. from the screen.

 

Abstract: A pedestrian crossing is a place on the street designed for pedestrians to cross the streets. According to the traffic police, it was revealed that the low level of pedestrian crossings is one of the main factors contributing to accidents and deaths at pedestrian crossings. This study identified problems associated with the design of pedestrian crossings through observation and interviews with both road users and law enforcement. This study highlights issues related to the design of pedestrian crossings and provides recommendations in accordance with international standards to ensure their safety for all road users.

 

Key words: pedestrian crossing, research, pedestrian, movement, vehicle.

 

Platonov, A. A. Statistical processing of the results of the study of competitive bids for the removal of unwanted vegetation from the territory of infrastructure facilities / A. A. Platonov // Voronezh Scientific and Technical Bulletin. - 2020. - V. 2, No. 2 (32). - S. 128-144. Access mode : http://vestnikvglta.ru/arhiv/2020/2-32-2020/128-144.pdf - Head. from the screen.

 

Abstract: For the proper maintenance of a number of infrastructure facilities, it is necessary to carry out work to remove unwanted vegetation from their territory. The article provides information on the mathematical and statistical processing of data obtained as a result of the study of competitive bids for the removal of unwanted vegetation from the territory of various infrastructure facilities, formulates conclusions and recommendations to organizations that order the work.

 

Key words: infrastructure, unwanted vegetation, bid, data processing, statistics.

 

Vargasov, A. S., Pryadkin, V. I., Kolyadin, P. A., and Artemov, A. V. Modeling the movement of a mobile vehicle carrying liquid in a tank // Voronezh Scientific and Technical Bulletin. - 2020. - V. 2, No. 2 (32). - pp. 145-150. Access mode: http://vestnikvglta.ru/arhiv/2020/2-32-2020/145-150-.pdf - Head. from the screen.

 

Abstract: The article deals with the problem of the influence of fluctuations of the transported liquid in the tank of a mobile vehicle on the smoothness of the ride. To solve this problem, a program has been developed to simulate the movement of a mobile vehicle carrying liquid in a tank. The program simulates the movement of a mobile vehicle on a random uneven surface, and also simulates the movement of liquid in the tank of the mobile vehicle, taking into account the mutual influence of the mechanical subsystem and the liquid. The developed model has a high level of versatility, therefore, it automatically reproduces various options for the state of the liquid in the tank, depending on the conditions of the movement of the mobile vehicle.

 

Key words: mathematical modeling, fluid oscillations, particle dynamics, computer experiment.

 

Popov, V. M. Heat transfer in contact pairs from homogeneous and heterogeneous materials / V. M. Popov, O. R. Dornyak, D. V. Popov, M. D. Lazebny // Voronezh Scientific and Technical Bulletin. - 2020. - V. 2, No. 2 (32). – S. 151- 157. Access mode: http://vestnikvglta.ru/arhiv/2020/2-32-2020/151-157.pdf - Head. from the screen.

 

Abstract: A method is proposed for directional change in the properties of joints on adhesives by jointly exposing the adhesive or adhesive layer of a heterogeneous nature to a constant magnetic field and ultrasound. It has been established that due to the compaction of the adhesive structure by the action of a combined physical field, the strength of the adhesive joint based on this adhesive increases. When this field is treated with a melt of glue with a dispersed metal filler, heat-conducting bridges are formed in the adhesive layer, consisting of a finely dispersed filler. Such bridges of filler particles significantly increase the thermal conductivity of the adhesive layer.

 

Key words: adhesive layer, thermal conductivity, oscillation frequency, field strength, magnetic field, ultrasound, strength, metal filler.

 

Popov, V. M. Contact heat transfer in brake devices of modern machines / V. M. Popov, O. R. Dornyak, I. Yu. Kondratenko, M. D. Lazebny // Voronezh Scientific and Technical Bulletin. - 2020. - V. 2, No. 2 (32). – S. 158- 163. Access mode: http://vestnikvglta.ru/arhiv/2020/2-32-2020/158-163.pdf - Head. from the screen.

 

Abstract: The process of heat transfer from a heterogeneous material to a homogeneous one is studied using the example of heat transfer between brake linings and discs. It has been established that the structure of the contact surfaces plays a significant role in this process. An effective method seems to be to increase the thermal conductivity in the interface zone by applying a magnetic field to the adhesive layer.

 

Key words: heat transfer, heterogeneous material, homogeneous material, surface contact, braking device.

 

 

Popov, V. M. Thermal flaw detection of joints on adhesives / V. M. Popov, O. R. Dornyak, I. Yu. Kondratenko, M. D. Lazebny // Voronezh Scientific and Technical Bulletin. - 2020. - V. 2, No. 2 (32). - S. 164-169. Access mode : http://vestnikvglta.ru/arhiv/2020/2-32-2020/164-169.pdf - Head. from the screen.

 

Abstract: To carry out non-destructive quality control of joints on adhesives, a thermal method is proposed, which is based on the effect of the relationship of thermophysical properties (thermal conductivity coefficient) with internal stresses arising in adhesive joints during the polymerization of the adhesive. The method allows, by determining the thermal diffusivity of the adhesive layer, to predict the formation of internal stresses, which are the main suppliers of macrodefects in adhesive joints. The use of the proposed method makes it possible to obtain kinetic data on the development of internal stresses.

 

Key words: flaw detection, non-destructive testing, temperature, adhesive joints, internal stresses, thermal diffusivity.

 

Kvitko, K. S. Optimization of the transportation process of road transport enterprises / K. S. Kvitko, V. A. Ivannikov // Voronezh Scientific and Technical Bulletin. - 2020. - V. 2, No. 2 (32). - S. 170-176. Access mode : http://vestnikvglta.ru/arhiv/2020/2-32-2020/170-176.pdf - Head. from the screen.

 

Annotation: The article deals with the issue of increasing the efficiency of the process of transportation of ATP. To increase the profit of the enterprise, it is necessary to constantly optimize the transportation process. The initial stage of optimization is the process of processing requests. At this stage, the required rolling stock is selected and the optimal route is created. The logistics of transportation depends on how this process goes. An analysis of the annual time fund of the rolling stock was also carried out, from which it can be seen that in order to optimize the transportation process, it is necessary to increase the time of using the rolling stock. To do this, it is necessary to reduce the downtime and the time the vehicle is in service or repair, constantly monitor such indicators as the coefficient of technical readiness and the utilization rate of the rolling stock.

 

Key words: ATP, annual fund of time, rolling stock, coefficient of technical readiness, utilization coefficient of rolling stock.

 

Kadyrmetov, A. M. Technological support for the restoration of typical internal combustion engine parts by plasma deposition and hardening of coatings / A. M. Kadyrmetov, E. V. Snyatkov, V. N. Bukhtoyarov, K. A. Radygin, A. K. Andryushchenko, I. A. Kichatov // Voronezh Scientific and Technical Bulletin. - 2020. - V. 2, No. 2 (32). - S. 177-190. Mode access: http://vestnikvglta.ru/arhiv/2020/2-32-2020/177-190.pdf - Head. from the screen.

 

Abstract: The paper analyzes the technological equipment for the processes of plasma deposition and hardening of coatings on parts of internal combustion engines such as a shaft (crankshaft, distribution), valve, cylinder, including using the developments of the authors.

 

Key words: plasma spraying, plasma torch, technological support, details.

 

Zhuzhukin, N.V. Information and intelligent technologies in car service / N.V. Zhuzhukin, P.A. Nartov, V. P. Bychkov, V. I. Pryadkin // Voronezh Scientific and Technical Bulletin. - 2020. - V. 2, No. 2 (32). – S. 191-195. Mode access: http://vestnikvglta.ru/arhiv/2020/2-32-2020/191-195.pdf - Head. from the screen.

 

Abstract: The article discusses the main areas of application of innovative technologies in a car service, the use of which has led to significant changes in the whole concept of technical repair and maintenance stations, primarily the entire material and industrial basis, technological service, as well as diagnostics of repair work, both passenger and and trucks. More significant changes in the car service occurred with the introduction of information technologies, which made it possible to optimize the statistical accounting of services provided, consumable spare parts and repair materials, minimize material costs and labor resources, and increase the level of organization of warehouse operations.

 

Key words: car service, additive technologies, car service digitalization, spare parts, diagnostics, warehouse operations.