The article identifies the unknown parameters of the transfer functions of governing and operating channels of the control object. To do this, we have carried out processing of results of experiments. It is shown that there is not only dynamic but also static nonlinearity of the control object, expressed in physically less persistence processes increase the pressure by increasing the opening of the steam regulating valve compared with the opposite processes
Waterflooding helps in the recovery of great amount of
oil that would have otherwise been abandoned in the
reservoir that is depleted. A reservoir in the Niger
Delta, Reservoir X has been used to illustrate this.
Reservoir X had oil initially in place as 7.345 MMSTB
and was produced for some time with the reservoir
natural energy. The remaining oil in the reservoir as at
the time that the natural energy of the reservoir was no
more sufficient to produce oil was 2.96MMSTB. The
reservoir has been left as depleted reservoir with the
remaining oil in it. But from the analysis conducted in
this work it is seen that if secondary oil recovery
project by waterflooding is embarked on the reservoir,
part of the remaining abandoned oil would be
recovered. With the specifications given, about
1.22MMSTB of the 2.96MMSTB of oil in reservoir X
would be produced as at the breakthrough time of 580
days. Moreover, considering the economic aspect of
the project, reservoir X and is good to be invested in.
From the NPV calculations performed, it is seen that
the NPV of reservoir X at discount rate of 10% is
$4.13 million
This article cites the data about the amount and
productive capacity of oil producing enterprises in the
Russian Federation on the whole, as well as in
Krasnodar region and the Republic of Adygeya. It is
shown, that innovations in the field of waste disposal
and waste recycling left after oil production are the
most effective, as they contribute to the cost reduction
on disposal of waste on landfill and thus, improve
environment considerably. They also provide
additional revenue from the sale of new products,
received after waste recycling. The authors examined
literature data on compositional and chemical analysis
of waste left after cleaning main oil-bearing crops,
processed by oil-producing industry of the Russian
Federation (such as sunflower, rape, soy-beans) . The
analysis of available technologies of their disposal,
such as waste incineration, pyrolysis, worm
composting, landfilling, biothermal composting,
granulationa of waste and the processing of undersow
is submitted to your attention. The analysis of
advantages and disadvantages of all available
technologies was carried out, and it was noticed that
neither of available technologies had become common
use. The most prospective direction for the
development of efficient technology of waste recycling
has been chosen, which includes the use of waste
pressing after their rational preparation and isolation of
uniform and valuable components. It is shown, that the
primary task for the development of such technology is
the study of waste composition of raw materials and
industrial cleaning of sunflower seeds, soy-beans, and
modern sorts of rape and its hybrids
Improvement is offered for working bodies’ forms in
devices for preparation of forages by methods of
engineering geometry and computer graphics. That
opens not only great opportunities for intensification,
increase in productivity and efficiency of the
technological processes, but also opens ways for
creation of small-sized devices for their realization.
Constructive study of geometry of working bodies
surface, allows us to give wavy movement to particles
of forage and impart them the movement with bigger
power consumption. In such installations forage
particles components, meeting walls of working body,
change their direction and, meeting other portions of
particles of forage components, mix up. From loading
to unloading, throughout the installations working
body length, flexible and strong waves of forage
particles components movement inside the working
body are born. The conducted pilot studies have
shown that as a result of working bodies’ forms
improvement of devices for preparation of forages by
methods of descriptive geometry such devices can be
implemented in a variety of industries
The article reveals the basic principle of stabilizing
the DC voltage, providing automatic control of
electrical devices and electrical equipment, control
systems, control and protection, etc. There are
functional diagrams (operated and promising) of DC
voltage stabilization with a device included in the
input and output power circuits of the rectifier, and a
new structural solution to a functional circuit of the
rectifier made of two controllable power electronic
devices and transformer with midpoint. The article
lists peculiarities of the circuits of the voltage
regulators and their main advantages and
disadvantages. We have reviewed functional
diagrams of existing and new solutions of the
stabilizers and the characteristics of their work; it
will increase the effectiveness of pre-project works
on the development of stabilizers of the DC voltage
with improved performance characteristics. This
article might be useful for post-graduates and
research workers who are involved in the
development of DC voltage stabilizers
The article is devoted to the solution of the urgent task, which is to increase the reliability of the power supply systems of enterprises for processing agricultural products. The material of the article has a research character, which consists in the fact that the obtained expressions for the frequency characteristics of high-voltage induction motors allow us to investigate the symmetric modes of their operation by means of a more efficient and simple apparatus. A number of provisions of the article have a scientific novelty, which consists in obtaining frequency characteristics for induction motors as a result of the experiment. A convenient procedure for obtaining the frequency response of an induction motor based on the results of an experiment using the mathematical model of an induction motor in the coordinates of the generalized vector and the Fourier transform has been developed. As an example, oscillograms of the stator current of an induction motor of the A-12-52-4 type are given for the initial stage of the start-up. For the stator current of this induction motor, a transition is made from the phase coordinate system to the coordinates of the generalized vector. The dependences of the stator current on the D and Q axes on time are constructed. The real and imaginary parts of the frequency characteristic of the engine are calculated for sliding s = 1, the calculations are illustrated by the corresponding graphical characteristics. The results of the study are proposed to be used for the calculation of transients in power supply systems for enterprises engaged in the processing of agricultural products
The article presents results of the study of devices for
preparation of feed based on the relative helical drums.
In addition, we have created a method of calculation of
the drive, including motor power. We have given a
calculation sheet for relative helical drums of types of
5.1 and 3.1, as well as typical schemes of devices for
preparation of feed (feed-making machines) composed
of hollow equilateral triangular of hollow tetrahedrons
pyramids and hollow octahedra. The created method
of calculation of the drive was tested in the calculation
of power consumption of feed-making machines based
on spiral reels of 5.1 type mounted using hollow
tetrahedrons and spiral reels of 3.1 type, assembled
from hollow octahedra. It is shown that in the
calculation of the actuator, we should not only take
into account the mass loading of feed components, the
relative weight of the screw drum assembled with
wheels, for a symmetrical load location, but also a lot
of download components of feeds, arranged in a spiral
relative the drum asymmetrically to the axis of
rotation. Thus, summing up the power of the electric
motor, required for relative rotation of the screw drum
symmetrically loaded and also under asymmetric load
we define the motor power for the device for
preparation of feed, or feed-making machine
This article is devoted to the problems of the
improvement of foodstuffs quality as a component of
food security of the country and its regions. The
analysis of the difficulties of domestic producers of
foodstuffs associated with the imperfection of the
regulatory framework is made. Insufficient supply of
good quality foodstuffs can significantly affect the
well-being of the population, the health of the nation,
the sustainable economic growth of the country, its
financial stability, and overall economic security of
Russia. The priorities of the Strategy of improving the
foodstuffs quality till 2030 are given; the main of those
ones is the organization of monitoring over the
foodstuffs quality in security issues, power, food and
biological value, as well as in the field of consumer
characteristics (appearance, marking, etc.)
The article describes a method for obtaining the functions
of energy and accumulation wind periods, using
the program Microsoft Office Excel. We have showed
the algorithm of the programs that had been developed
to reduce the processing time for large quantities of
data. Obtained functions are recommended for determining
the optimal parameters of autonomous windpower
stations with accumulated reserve
Our research aims at providing new effective control
methods for scientific and technical expertise to
organizations and foundations that fund research
projects on a competitive basis. These methods should
provide analytical decision support for group decision
making in a distributed environment. In this work, we
consider an integral model for knowledge
representation – a socio-semantic knowledge network
that combines social links and a semantic description
of knowledge into a mathematically formalized graph
theoretic structure. In terms of actor-network theory,
we consider a multimodal network with actors on one
of the levels and artefacts (i.e. contexts that express
network links) on the other level. In order to represent
knowledge domain based on a graph and hypergraph
paradigm and fuzzy sets theory, we provide a
sufficiently complete set of elements and relations
(either trustworthy or partially trustworthy) both
between multitype elements and their heterogeneous
groups. The formal representation allows applying the
model to solve numerous practical tasks such as expert
finding, formation of expert groups, expertise
refinement, reduction of subjectivity, analysis of an
expertise process, analysis of processes within expert
groups. Research methodology: social network
analysis (SNA), theory of graphs and hypergraphs,
fuzzy calculus and fuzzy logic