№ 132(8), October, 2017
Public date: 31.10.2017
Archive of journal: Articles count 111, 292 kb
-
MATHEMATICAL MODELING OF SPECIAL ELECTRIC DRIVES FOR THE EQUIPMENT OF OIL AND GAS BRANCH
Description
Creation of new types of special electric actuators for the oil and gas industry implies development of new approaches to simulation, design of the considered types of electric actuators. In addition, it requires development of new algorithms for creation of a complex of application programs of computer-aided design of special electric actuators. As process of simulation is quite labor consuming, it is offered to realize it gradually. In this article, the question of mathematical simulation of special electric actuators for the equipment of oil and gas branch using methods of electromagnetic conversion of energy is considered. Results of mathematical simulation were realized in the form of the program products, which are a part of system of computer-aided design
-
INNOVATIVE TECHNOLOGY OF DUALSTAGE OBTAINING RAW JUICE AND ITS PURIFYING IN SUGAR INDUSTRY
Description
The typical scheme of sugar beet processing, used at most sugar beet factories in Russia has not been fundamentally changed for several dozens of years. As a result, the performance indicators of domestic beetprocessing enterprises are below the world average. The article considers the technology of two-stage extraction and subsequent lime-carbon dioxide raw juice purification with the separation of the preliming sludge and carrying out the carbonation treatment in one step. The theoretical foundations of a two-stage extraction of sucrose from sugar beet cossettes are described and the main criteria for its implementation are given. The chemistry of calcium compounds upon activation of a suspension of saturation precipitation, returned to a progressive preliminary defecation, is shown. On that the increasing of sedimentationfiltration properties of the preliming sludge is based that allows its separation on the existing equipment in based. The theoretical premises for carrying out saturation in a homogeneous liquid-liquid environment are given and practical principles for their realization are described. The comparative evaluation of existing and improved sugar beet processing technologies is carried out. The improved technology makes it possible to reduce the amount of raw juice while improving its purity, thereby reducing the consumption of auxiliary materials, fuel and energy resources, simplifying the technological scheme while improving the quality of the purified juice, namely, its higher purity, achieved by reducing the degree of transition of high-molecular compounds in it and increasing the effect of destruction of reducing substances
-
POWER SOURCES OF OPERATION, CONTROL AND PROTECTION DEVICES
Description
Currently operating in autonomous systems of power supply DC voltages power sources are secondary sources for operation devices, protection and control of generators, motors, stabilizers and inverters have relatively low operational performance. The work proposes to improve the weight and the size of power supplies to apply a high frequency link in their designs. We provide structural designs and the peculiarities of operation of secondary power sources with a high frequency link. This article discusses the fundamental electrical circuits of pulse regulators, converters based on resonant inverters and transformers with rotating magnetic field. The use of resonant inverters in power sources will significantly improve their weight and overall dimensions. In addition, the use of secondary sources of supply for transformers with rotating magnetic field will simplify their design and reduce the level of electromagnetic interference generated by semiconductor devices. The features of operation of pulsed regulators and prospective structuralschematics converters discussed in the article, performed on resonant inverters and transformers with rotating magnetic field, will increase the effectiveness of pre-work on the development of secondary power sources with improved operational and technical characteristics for devices of operating, control and protection
-
OPTIMIZING THE SHAPE OF A CENTRIFUGE ROTOR
Description
The use of regenerated oils reduces the consumption of fresh oils for refilling, while oil filtration during the operation lengthens their service life and reduces the consumption of fresh oils for replacement. To restore waste oils, a variety of technological operations are used, based on physical, physicochemical and chemical processes. They are aimed at treating the oil in order to remove aging products and pollution from it. The studies have shown that the most effective means of recovering the quality of waste oils are small-size regeneration plants. The main difficulty in creating small-sized regeneration plants is the selection of a sufficiently effective, environmentally safe and economically justified method for the regeneration of waste oils, as well as its hardware design. This work is aimed at creating an efficient centrifugal cleaner
-
Description
The article examines the issues of increasing the efficiency of the system of technical operation of mobile agricultural machinery by means of monitoring the state of units and aggregates of the latter through diagnostics. The problems of complex diagnostics of diesel fuel equipment are investigated. The urgency of diagnosing a fuel injection pump without dismantling from the engine is shown from technical, economic and environmental points of view. The effect of operational malfunctions of some devices of fuel equipment on parameters of its operation as a whole is analyzed. On the basis of the analysis of diagnostic devices application, their grouping is suggested. The parameters to be studied in connection with peculiarities to decide whether it is possible to estimate the technical state of the fuel injection pump without dismantling from the internal combustion engine are indicated. Based on peculiarities of the fuel injection pump technical state estimation, a research program is developed and the results of the research are presented. Specific features of testing the fuel injection pump are indicated. Analysis of the results of the research shows that a smaller error in the change of the cyclic fuel feed rates supplied by the fuel injection sections takes place at the engine speed corresponding to the indicated power. The conclusion is made that the presented research results can be used as a basis for developing a technique (technology) for diagnosing the fuel injection pump without dismantling from the internal combustion engine
-
Description
The article is devoted to the analysis of the use of large data processing technology in information systems of territorially distributed complexes
-
Description
Technologies of fruits storing known at the present time, solving actual problems – slowing down biochemical processes, inhibiting ethylene synthesis, do not provide fully the preservation of quality of fruits due to not taking into consideration the peculiarities of microflora of fruits and microbiological processes, taking place during storage. Purpose of the research: investigation of influence of complex treatment of fruits with electromagnetic fields of extremely low frequency (ELF EMF) and the biopreparation “Vitaplan” on changing of losses of biologically active substances in the process of longterm storage. Objects of the research: apples of the Idared variety and pears of the Conference variety, regionalized in the Krasnodar region. Mass shares of the vitamin C and P-active substances were measured in the process of storing. ELF EMF treatment was conducted on an experimental installation. Fruits were exposed to the action of electromagnetic fields with specified parameters. Complex treatment of fruits (apples and pears) with ELF EMF and the biopreparation “Vitaplan” before dispatching for storage allows preserving the biologically active substances – the vitamin C and P-active substances – to the maximum degree. Synergetic effect, appearing due to the complex action of electromagnetic field and the bio-preparation, allows decreasing the processing time in the electromagnetic field
-
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
The aim of the article has been the study of deflection laws in tractor oversize low-pressure tires, intended for class 5 tractor propulsion. The research method was experimental. The "tire tester" and specially designed devices for determining the deflections of the inner and outer tube relative to the rim in the circumferential, radial and collateral directions have been used in it. A number of factors determine outcome indices of the wheel with pneumatic tyre. Among them the ability of the tire to deform so that at low - hysteresis losses in the rubber-cord casing and admissible stresses in it, based on resource, the largest area of contact with the supporting base has been created. This circumstance is of particular importance in the development of tractor tires of low pressure, deflection characteristics of which are poorly studied at present. Analysis of experimental studies showed the necessity of the feasibility of creating the tire with the cord orientation in its casing so that in the zone of perception of the vertical and longitudinal forces the cord threads would work in a mode close to the extension, but in the area of contact it would work in bending. These requirements will best meet the tire in which the cord threads are parallelly located in adjacent layers and directed at a predetermined angle in the direction of effect of the axial forces on the wheel in oncoming fibers
-
DETERMINATION OF PARAMETERS FOR EFFICIENT COMBUSTION OF LOW-SULFUR FUEL OIL
Description
The 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
pdf 556.694kb
doc 556.694kb