At the nodes of the various machines, we use plain bimetal bearings: a steel base - antifriction cladding layer. Bimetal bearings have increased performance. One of the ways of making such bearings is the way of centrifugal bimetallization with heating of the independent electric arc. An important requirement of this technology is a uniform heating of the workpiece along the entire length until the formation of a continuous layer of the molten cladding material. The process of bimetallization require temperature control, since within the movement of the electric arc, low heat or high heat are possible due to heat dissipation from the ends of the workpiece in the installation and from the outer surface of the workpiece to the environment. A viable option the temperature control of the heat process of bimetallization for industrial conditions is to control the temperature of the outer surface of the steel base. It is necessary to solve the heat problem of the relationship between the temperature on the surface of the workpiece with the temperature on the boundary layers. For this purpose the numerical solution of the mathematical model of the thermal process, which includes the heat transmitting equation of Fourier and heat transfer at the ends of the sleeve according to Newton's law. The equivalent coefficients of heat transfer are obtained based on calculated and experimental thermograms. This is a time-consuming work. To minimize the time of fixing the boundary value problem of the thermal process of bimetallization, in this work we present the preliminary modeling based on the analytical solution of the thermal task of bi-metallization
With the aim of improving the productivity and performance of the sunflower seed separation process in the air-sieve seed-cleaning machine called MVU-1500 its multivariate analysis was carried out. The main indicators of the seed heap separation process were determined according to the feeding of the seed heap onto the sieve of the lattice. The indicators are as follows: completeness of the j-th components screening, the j-th components content in the sieve path, the completeness of their discharge and their content in the discharge from the sieve tier. Having adopted the hypothesis of a possible increase in the efficiency of the separation process in the air-sieve grain cleaning machine, we analyzed the delivery patterns of seed heap components into the pneumatic channel with the aim of optimizing the process. For a more complete assessment of the process indicators under consideration, basic patterns of movement of various components in the sieve-tier lattice were estimated. It was taken into account that in modern designs of air-sieve grain cleaning machines seeds are fed into the pneumatic channel from the sieves. When the width of the lattice is equal to one, the density of the j-th component of the seed heap is constant along the length of each sieve in the stack of sieves and the separation coefficient is constant along the length of the sieve, the expression received estimates the average speed of movement in the first sieve-tier lattice in the steady process of separation. There was evaluated the statistical significance of differences of the j-th component average speed movement on the second sieve- lattice by Student's t-criterion, which showed that they belong to the same sample of random variables and do not have statistically significant differences. Therefore, we can obtain the following velocity values of the heap of sunflower seed movement in the sieve-tier lattice: fragments of stems velocity is 0.0518 m/s; milled seeds velocity is 0.0381 m/s; velocity of sunflower seeds less than 3.2 and 3.2-3.6 mm thick is 0.0835 m/s, velocity of sunflower seeds of 3.6-4.0 mm thick is 0.0453 m/s, that of more than 4.0 mm thick is 0.0410 m/s
Techniques of value analysis and "Direct-costing" are
well-known and popular. The ideas and principles of
value analysis and the method of "Direct costing" are
very similar, if not identical. On the one hand, these
ideas are very reasonable, well grounded theoretically
and proved its effectiveness in practice. On the other
hand, the wide use of these methods is hampered by
the difficulty of obtaining large amounts of detailed
technological and financial-economic information, as
well as the need for careful research by competent
professionals, well-versed in substantive subject area.
This is the contradiction between the desire to apply
the methods of the value analysis and "Direct costing"
and difficulty to perform it in practice. This
contradiction constitutes a real problem and may often
be discouraging and frustrating. In this work, we
propose a simple and effective solution to this
problem, theoretically well-informed with all the
necessary methodological and software tools and
widely and successfully tested in practice. The
proposed solution is based on two simple ideas: 1)
instead of collecting and holding a meaningful large
amount of technological and financial-economic
information we might apply approaches, pleasant
management theory; 2) to create systems for
automated control of natural and financial-economic
efficiency of expenses we might use the automated
system-cognitive analysis and its software tool – an
intellectual system called "Eidos". In the name of the
specialty 08.00.05 – Economics and national economy management, there are such words: "management of
enterprises, branches, complexes, innovation." The use
of the term "Management" implies that there is a
model that reflects the influence of factors on the
object of control, and there is the management system
making decisions based on this model. However, as a
rule, the dissertations in this field have nothing of this,
except only financial and economic calculations. The
article proposes an approach based on the control
theory, removing this disadvantage
The article presents the theoretical and experimental research of the guide wire, made of polytetrafluorethylene, for sieve system of air grain cleaning machines. We have calculated trajectory of movements of the components of piles of sunflower seeds in the vertical pneumatic channel when they are vanishing from the surface of the guide wire at its various parameters. Specifying the location of a guide wire polytetrafluorethylene in air-sieve grain cleaning machine was carried out in an experimental setup. The guide wire of polytetrafluorethylene was installed in three locations: 1) at a distance of 20 mm to the pneumatic channel; 2) on the levels with the pneumatic channel; 3) at a distance of 20 mm inside pneumatic channel. The approach of the guide wire into the inside of the pneumatic channel in the experimental setup the quality of sunflower seeds increased with 97.61 to of 99.08 %. The content of organic impurities, milled and broken seeds in the pile decreased respectively from 1.83 to 0.21 %, to 1.29 0.66 % 0.51% to 0.25% in the manufacture of wire made of polytetrafluorethylene. To increase the purity of the seeds of the main culture we use a photoelectron separator, and the received seeds for animal feed were in the form of sunflower cake produced on screw presses. As a result of carried out experimental and theoretical researches it is established, that the guide wire shall be made of polytetrafluorethylene and are placed inside the pneumatic channel at a distance of 20 mm and an angle of 40°, which allows to improve the quality of the seeds material and increase the speed of their input to pneumatic channel air-sieve grain cleaning machines type MVU-1500
This work presents main kinds of colourants and methods of painting wood particles. Based on wood structure analysis, it was revealed that hard wood, possessing tracheides and vessels as conducting elements, have the optimal capacity for coloration, in comparison with coniferous trees. A methodology was developed of cloning wooden particles, in the form of chips, with forced immersion in order to obtain established parameters of saturation and brightness. The experiments were conducted with chips of 15-50 mm long, 5-20 mm wide and 3-7 mm thick. The composition of colouring agent included water, acetic acid, and water-emulsion colourants of different types and colours (№1 – colour code (red, yellow, and brown) №2 – colorant (lilac and orange) and №3 – paint). Experience has shown the needed concentration of liquors and mass percentage of compounding ingredients. The research was undertaken to study concentration dependence on the time of allowance and saturation. In consequence of colouring experimental batches of chips, a painting saturation of 4-9 points was obtained at the allowance of 120 and 140 seconds. Dependence of brightness from solubility was determined, with high correlation between given parameters on Pearson Criteria (more than 0.9). Comparative analysis made it possible to discover that the better colouring of particles is created with the red paint. In this case maximum colouring effect is achieved with liquor of water-emulsion paint. Subsequent to the experimental results, a design of installation for colouring wooden particles was developed and patented
Currently one of the promising areas to significantly
improve efficiency of energy saving is the
introduction of renewable sources of energy into the
energy system. In the field of solar energy, we
consider solar photovoltaic power plants with direct
conversion of solar radiation into electricity using
solar panels as the most promising ones. The article
examines the main factors that reveal the prospects
of applying solar photovoltaic power plants. It also
discusses the main advantages and disadvantages in
comparison with traditional and other renewable
energy sources. To improve the operational and
technical characteristics of solar power plants in
their structure significantly, it is proposed to use new
components. Stand-alone inverters for single-phase
transformers with rotating magnetic field will reduce
the number of power electronic devices in the
conversion circuit; they will simplify the system of
control and protection, reduce electromagnetic
interference and improve overall efficiency and
reliability of the converter of the solar power plant.
In addition, the modular design of solar power plants
will also increase the reliability of the power system
due to redundancy of the major functional elements.
It is also important that the construction of solar
power plants in a modular way enhances
maintainability of the system, it significantly reduces
the time for maintenance and troubleshooting in
emergencies; it simplifies the task of changing its
structure depending on requirements of users. The
article reveals peculiarities of work and the main
benefits from the application of solar photovoltaic
power plants
In the article we consider severe conditions of operation of forest cars caused by the difficult land relief and service dirt roads which are badly equipped, as a rule, abounding with roughnesses, obstacles in the form of large superficial roots, stones and boulders, frequent turning movements, steep ascents and descents, considerable cross biases, hollows and boggy sites which lead to increase in consumption of fuel by 1,5-2,0 times and to cutting-down of their life cycle. Ways of increase in their efficiency by equipment by the recuperative mechanisms providing reuse in working process unproductively disseminated to the environment energy, and also promoting increase in reliability and simplification of a design of such cars are analyzed. On the basis of the analysis of the results received when studying a condition of a question, the authors have offered a design of a forest car with a recuperative hydraulic actuator in which gears of recovery are the arrow, a handle and the basic and rotary device of the hydraulic manipulator, reversible hydraulic motors of wheels and a suspender of the forest car. The scheme is submitted and work of a recuperative hydraulic actuator is described. The technique of an assessment of efficiency of the offered design of the forest car with system of recovery of energy is given. The cyclogram of working process of the forest car with the offered hydraulic actuator is constructed
The article presents the development of multi-detail
women’s dress with rectilinear articulation that are
located according to the principle of traditional middle
East ornaments. As the source we have selected
geometric ornaments called girih
Education was always an important part of the
development of the individual and society, because
education is the process of the formation of mind and
character. Each level of education currently requires
increased attention, since the quality of life of future
graduates directly depends on the quality of the
provision of educational services. Despite the fact that
most of the educational process is formalized by
educational standards, regulatory documents and local
acts of educational institutions, this area continues to
need both automation and the development of various
models, methods and techniques, the use of which will
greatly optimize the implementation of the educational
process. There are few software products, models and
methods that assess the quality of education and the
educational process in general, aimed at individual
elements of the educational system. In all the existing,
basically, there is only support for working with
bachelors, slightly less often with masters and very
rarely with graduate students. This article describes
methodological approaches to assessing the
achievements of graduate students, as well as an
information system for supporting the educational
process of graduate school
The aim of the research was to develop a geographical
information system (GIS) for monitoring soil fertility
based on calibrated remote sensing data within Rostov
region. The possibility of developing a geoinformation
system for irrigated agrolandscapes monitoring based
on modern computer geoinformation technologies for
problems solving of reclaimed territories management
in cooperation with other automated information
technologies is considered. An example of selecting
main degradation processes for the irrigated
agrolandscape within Rostov region boundaries, the
main possibilities of the system and the proposed
directions for its development are presented. To
develop a geoinformation monitoring system, the
ArcGIS 10.4.1 for Desktop software package has been
selected. Monitoring GIS includes remote sensing data
obtained from the VEGA-Science satellite monitoring
service. The technology for creating a geodatabase for
degradation processes monitoring, necessary for rapid
analysis of information and time-saving on collection,
processing and calibration of data bulk is introduced.
As a mapping principle, graduation of farm fields by
intensity of land degradation processes was used. GIS
monitoring includes multi-layer digital maps and data
attribute tables characterizing the main indicators of
soil fertility and crop seeding development. The use of
GIS technologies with satellite data will significantly
reduce the complexity of field survey data processing
by data processing automation and is promising for
developing computer monitoring systems for irrigated
agro landscapes. Farm specialists are offered a
convenient mechanism not only for data accumulation,
but also for maintaining fields’ history with reference
to the yield year. Analysis tools allow performing data
spatial and logical queries, to run samples and reports