05.00.00 Technical science
-
Description
In the article we present questions of digital process control of heated air for drying seeds; it is shown that the change in the load of the heat source slightly changes the dynamics of the system for stabilizing the temperature of hot air, making it almost invariant with respect to perturbations. It is proved that the use of digital controller with dual differentiation significantly improves the performance of the automatic control system, excluding the increase astatism of the management system
-
FREQUENCY REGULATION OF THE SYNCHRONOUS MOTOR WITH A DOUBLE ANCHOR WINDING
DescriptionIn this article we show the results of a pilot study of frequency regulation of the synchronous motor with a double anchor winding. The rational law regulating the frequency converter and the possible ranges of the frequency regulation and the engine load are defined
-
FOUR MASSIVE THERMAL MODEL OF ELECTRIC DRIVE
DescriptionThis article offers four masses thermal model system that allows you to determine the thermal state of the motor in the brake of the drive
-
DETERMINATION OF PARAMETERS FOR EFFICIENT COMBUSTION OF LOW-SULFUR FUEL OIL
DescriptionThe article presents the calculation of combustion of liquid fuel, which is determined by the air consumption for combustion of fuel, then the number and the composition of combustion products – flue gas resulting from burning fuel and the flue-gas temperature
-
NUMERICAL SOLUTION TRANSPORT MODEL BINARY ELECTROLYTE IN APPROXIMATION OF OHM'S LAW
DescriptionThe article is devoted to the numerical solution of boundary value problem of the binaryelectrolyte model of transport in membrane systems in the approximation of Ohm's law. Different numerical methods are offered. The main regularities of transfer are established
-
Description
Here we present a brief survey of the occurrence of noise in agricultural production while using agricultural machinery and machines with possibility of application of the newest technologies including informational ones. It is well known, that noise is a constant component of all agricultural enterprises and it often indicates the operational condition of equipment and technical culture of enterprises. This is true about both stationary production, such as elevators, grinding plants, feed mills, corn processing plants, and tractors and harvesters. It is natural that above-mentioned mechanisms produce purposeful transformation of the movement. At the same time, any mechanism consists of separate parts that are flexibly joined with each other. In addition, it is due to this fact that the noise occurs. Thus, we should note that due to their design features and complexity of technology itself harvesters a priori are machines that create and produce noise. Noise reduction in machines and equipment is accompanied by increase of labor productivity. Thus, noise protection is an important issue. To reduce the noise a set of measures is applied but not all of them are efficient for selfpropelled machines, including harvesters. Besides, noise is one of the most important indicators of equipment quality, and in some cases, it can be the indicator of the technical level of a machine because it objectively displays inaccuracies in the manufacture of almost all parts. Therefore, noise control is an important problem that has social and economic value
-
NOISE POLLUTION OF URBAN AREAS (ON THE EXAMPLE OF VOLGOGRAD)
DescriptionIn the article, the questions of a noise pollution of environment from vehicles in cities are considered. The results of estimation of the noise pollution in Volgograd are surveyed
-
Description
The mechanical activation allows creating a active state in a solid, opening the prospect for holding and accelerating the chemical reactions between solids and getting materials in a nonequilibrium state. As a result of mechanical activation of the powder compositions of the active phase transformations occur in them, which lead to the formation of solid solutions and various intermediate connections, providing dispersion and dispersion hardening of materials included in the composition. The results of the study of the granulometric composition, the phase transformations and structure evolution in multiphase materials with SME Ni-30%at.Ti-20%at.Hf and Ni-33%at.Ti- 18%at.Zr at different stages of the process of mechanical activation carried out in planetary ball mill the centrifugal type is represented in the article. During mechanical activation, a composite mix is assimilated by the particles of processed material input of mechanical energy in the form of new interfaces, defects of the crystal lattice. At collision of particles and grinding bodies in contact high local temperature and pressure occur, which in some cases can lead to melting of the most fusible components. When a local increase in temperature between the particles of titanium, hafnium, zirconium and carbon solid-phase reactions become possible due to diffusion of atoms of one component into the crystal lattice of the other. Experimental studies have shown that the use of mechanical activation allows creating an effective technology of preparation of the starting material for high-speed flame spraying
-
Description
Results of the research on ecological safety of utilizing high clearance tractors for cultivation and harvesting of high stalk plants are presented. Purpose of the research was to decrease damaging of high stalk plants during multi-pass harvesting by tractor parts. For increasing efficiency and competitiveness of high stalk plants decreasing prime cost of production, increasing profitability and labor productivity are required. This can be achieved by introducing complex factors, which together with other factors as complex technological and technical modernization are required. Basic direction of modernization is utilizing completely new technologies and renewal of machines. Modern tractors utilized for tobacco growing have been analyzed. Basic demands for high clearance tractor which can be used for tobacco, grape and fruit trees growing have been developed. Researches on studying the tobacco plant folding during harvesting have been carried. Scheme of high clearance tractor MTZ-80 which can be assembled with machines for multi-pass harvesting of high stalk plants without their damaging has been developed. New scheme for modernization tractor MTZ-80 into high clearance model has been proposed. It can be done by changing speed reducers and forward wheels with size 11,2x20 on size 11,2x28. This will increase clearance from 470 to 840 mm
-
ATMOSPHERIC SHIP EMISSIONS ECOLOGY
DescriptionIt is shown, that shipping transportation facilities are the source of air pollution and underlying water surface. The analysis of aerodynamic characteristics of the aerial ship pollution containing hazardous substrances in gas solid phases is given. Concentration of ecologically harmful impurities has distribution according to the direction of running stream spread and its cross section. Zones of running stream contact with underlying sea surface are made