In the present article, a technique for studying the
influence of the parameters of a drying plant on the
optimization criteria is described. The design of a
laboratory plant for drying bee-bread is presented. An
adequate empirical dependence of the effect of the
parameters of the process under study on the residual
moisture of bee-bread is established. An optimal
combination of factors has been revealed, which
makes it possible to minimize the residual moisture
of bee-bread
The article formulates and solves the task of discrete
control in the thermophilic stage of the composting
process. It is shown that considering the relay control
entity to maintain specified process conditions requires
the organization of the sliding mode. We have solved the
problem of minimizing the temperature deviation of the
substrate from the set values and the deviation of the
oxygen concentration in the gas phase of the bioreactor
from the specified values. The article shows the
algorithm to compute the discrete control of the
composting process in the thermophilic stage. This work
was prepared in the framework of the scientific project
16-48-230441 a(R) "Mathematical modeling of the
processes occurring in the automated installation for
year-round production of organic fertilizers in the
conditions of the Krasnodar region", financed by RFBR
and the administration of the Krasnodar region
We have experimentally studied fluctuations of power of an electric arc in different types of plasmatrons with different power supplies in the article. Influence of fluctuations of power of the plasmatron on technology parameters of a plasma stream (current, voltage, an enthalpy, temperature, speed of a plasma flow) and on process of forming of coatings at impulse plasma was experimentally shown that the nature of fluctuations depends from fluctuations of voltage of the power supply, plasmatron type and also from fluctuations of an electrical arc. The size of fluctuations of power can be 50-100%. It is experimentally shown that impulses of power of an electric arc are capable to complicate supply of sprayed powder in to the plasmatron. Such fluctuations do not make dispersion of the melted powder particles. In the work, we have drawn conclusions that large-scale pulsations are capable to worsen quality characteristics of plasma coatings significantly
The article is devoted to finding of the optimum
parameters for elastically damping mechanism (EDM)
which is located in transmission of machine-tractor unit
(MTU). The investigated MTU is based on the tractor
of 1.4 class in plowing mode. EDM is designed for
MTU in order to make its’ start smoothly, to reduce the
dynamic load in transmission, to protect engine from
the external load vibration. The “transmittance level”
(index T) is used as evaluation of the protective
mechanism quality. The study was carried out by
means of the experiment planning method, viz. the
central composition plan of second order with five
factors. A regression model for response function
(“transmittance level”) is given. This model takes into
account the chosen EDM characteristics. The statistical
analysis methods (Student’s t-test, Fisher’s test) were
used to study the regression model. The dependence of
response function on each factor apart, their cross
impact on the process are described. The system of
partial differential equations is obtained to find the
optimal values of parameters and response function.
The optimal value of a “transmittance level” can be
obtained by varying different EDM parameter values.
Optimal values of parameters and as result - response
function - allow improving of MTU functioning in
plowing mode
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 discusses the technique of calculating the
combine harvester under various harvesting
conditions. The authors consider two options for
optimizing the fleet of combines: the first, when the
harvested area is set, the second, when the harvested
area is not specified. In the first case, the harvester
park is calculated for a known area with different
harvesting times, but within the boundaries of the
agro-industry. In the second variant, a park of
harvesters is justified and it is calculated how much
space it will be able to clean for a different duration of
harvesting operations
The article analyzes the ways of ensuring a stable
quality of fruit in the process of storage. The patented
methods of storage, realization of which allows
increasing of storage life of agricultural products by
means of using low temperatures, regulating the content
of gaseous medium in the storage, creating hermetic
storing conditions, treating with chemical substances,
using biopreparations, were systematized. The analysis
of literature sources and patent information has show
that the development of methods for storing plant raw
materials with using biopreparations is up-to-date
Modern small logging enterprises exporting timber
primarily by lorry transport do not have resources for
implementing research that contributes to reducing
the cost of this type of transport. Besides, there is no
universal and accessible planning methodology and
operative decision-making in the organization of
timber export by lorry transport. Because of this, the
author of the article has proposed a methodology for
improving international timber transportation by
timber trucks. This methodology contains logging
modeling simulation, as well as analysis and contain
of different options of logging. Within the framework
of this methodology, a unique model based on the
discrete event simulation has been developed. This
model simulates a full cycle of timber transportation
from the terminal to several foreign consumers. The
working capacity of the model was verified by
simulating several export scenarios based on data
obtained during field study at one of the logging
enterprises, the annual logging volume of which is
400 thousand cubic meters. The analysis and
comparison of the modeling results have confirmed
the possibility of using this methodology in planning
and organizing international timber transportation for
small logging enterprises
This study proposes a method of determining the cost
of 1 sq. m. apartment on the example of Krasnodar,
which is especially important in connection with the
necessity of reliable and valid assessment of the
property value in a modern market economy. We have
performed an analysis of data on apartments in
Krasnodar from the site of the Regional Energy
Commission - prices and tariffs department of the
Krasnodar region. We have also had an exploratory
analysis of available data on the subject of emissions
and insignificant data (by constructing line graphs and
scatter plots); we have also checked for possible
dependencies between observations and between
variables (built correlation matrix). We have selected
variables is linear, the regression model for the
variable "cost of 1 sq. m the total area, ths. rub.
"(multiple regression). Using regression analysis as a
method of mathematical statistics we have revealed a
form of analytical dependence of the result of the
predictor variables and the degree of this dependence
In this article, we consider problems of power supply of modern electronic devices. The author proposes a new concept of source of power, which resolves this problem. In addition, this article describes limitations of existing desertions in the area of power supply. In the article, we suggest ways of resolving this limitation by creating a new source of power based on principles, which are different from the existing way. In this article, we develop a theory of creating a universal modular source of power, which would have some advantages. This article considers an optimal structural scheme of that source. We have developed a source of power which meets the requirements of power supply of modern electronic devices and has a potential supply for the next development