Scientific Journal of KubSAU

Polythematic online scientific journal
of Kuban State Agrarian University
ISSN 1990-4665
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183 kb

SIMULATION OF A POWER TRANSFORMER WORK WITH A HIGH LEVEL OF HIGHER HARMONICS

abstract 1331709003 issue 133 pp. 24 – 29 30.11.2017 ru 11
The importance of improving the quality of electrical energy was growing along with the development and wide implementation in the production of valve converters and various highperformance processing units, such as arc furnace, welding machines etc. The main causes of potential and existing non-compliances of non-sinusoidal voltages can be joining sources and non-sinusoidal reactive power sources, including resonant filters, to existing electric grids without taking into account their possible impact on the distortion of the sinusoidal voltage. Transformers are affected by the non-sinusoidal shapes of the curves of current and voltage. The effect is characterized by the fact that the harmonics of current and voltage increase transformer temperature, compared to purely sinusoidal current and voltage. The aim of this work is to study the influence of higher harmonics on power loss in power transformers. Experimental study of operation of power transformers was carried out on the developed model of the transformer substation. The experiments were conducted with different capacities of transformers that have variables in the range of 250-1000 kVA. By using programmable voltage source a sinusoidal voltage is formed containing the third, fifth, sixth, seventh, ninth and twelfth harmonics. The level of harmonics is changed in the range of 2-12 %
699 kb

A SURFACE RUNOFF CLEANING PLANT FOR THE TERRITORY OF THE NOVOROSSIYSK SEA PORT

abstract 1331709008 issue 133 pp. 72 – 81 30.11.2017 ru 10
The article considers scheme of sewage treatment plants AG-STOK of Novorossiysk trading sea port, designed to clean the surface runoff from the territory of industrial sites and residential areas to the norms of discharge in the drainage network. The installation includes a well-separator, a storage tank, mechanical cleaning of solids on a mechanical filter, filtration through a filter with granular loading and filtration through a filter with sorption loading. The treated runoff, which corresponds to the conditions of discharge into the urban drainage network, accumulates in a tank of clean water and is diverted to the storm sewer network. There are: the scheme of treatment facilities, the explication of equipment, a photo of a mechanical filter, a filter with a granular load and a filter with a sorption load. The indicators of surface runoff correspond to the norms of the maximum permissible discharge
230 kb

PARAMETERS OF RESEARCH ACTIVITY OF STUDENTS AS CRITERIA FOR DIAGNOSTICS OF EDUCATIONAL ENVIRONMENT

abstract 1331709010 issue 133 pp. 91 – 114 30.11.2017 ru 7
The article reflects the relationship between the parameters of research activities of students and the characteristics of the educational environment in higher education. It is known that the research activity of students is an integral part of the educational process, therefore, the parameters of research activity can and should be indicator variables reflecting certain aspects of the educational environment. According to modern views, all types of research activities of students (educational, research, scientific and practical and research) is the most important mechanism for the development of their research competence. In addition, the parameters of research activities of students - the reflection of the relationship of scientific and educational activities in higher education, and this - one of the most important factors of competitiveness of the educational environment. The authors substantiate that the parameters reflecting the research activity of students characterize, first of all, such aspects of the educational environment as its intensity, social activity, dominance, coherence, mobility, stability, reliability and efficiency. This is due to the fact that the research activity of students is a transdisciplinary process that depends on the same factors as the educational process as a whole and is characterized by the same didactic goals (tasks) as the educational process as a whole. In identifying the relationship between the parameters of research activities of students and the characteristics of the educational environment, the authors also took into account the relevance of such a task as ensuring continuity between levels of continuing education. The theoretical significance of the results of this study is that they can be the basis for further scientific understanding of the problems of the quality of education and the effectiveness of educational environments, the practical significance is that they can be applied in the systems of socio-pedagogical and psycho-pedagogical monitoring and the effectiveness of the educational environment, as well as monitoring the student's personal and professional development). Methodological bases of research: system, sociological, competence, probability-statistical and qualimetric approaches (leading methodological basis - competence approach). Research methods: modeling; methods of graph theory, sets and relations; systemiccognitive analysis; methods of qualimetry (theory of latent variables); methods of mathematical statistics (first of all - the method of rocky scree); methods of the theory of limits
140 kb

SEMANTIC SEARCH ENGINE BASED ON ONTOLOGY MAPPING

abstract 1331709014 issue 133 pp. 151 – 159 30.11.2017 ru 4
We live in a world of rapidly developing information technologies, where many organizations are related to each other, forming complex information networks. Therefore, storage, analysis and retrieval of information is a very complex and urgent task. In connection with the advent of search engines and communications, millions of people are engaged in the search and retrieval of information. Commercial search engines, such as Google, use keyword search based on logical queries. The main disadvantage of this search is that it returns a lot of irrelevant information, which leads to low accuracy. In this article, we focus on building a semantic search system based on the mapping of the ontological model. This includes various stages of development of ontology, the phase of indexing and information retrieval
575 kb

RESTORATION OF WORN DETAILS OF AGRICULTURAL MACHINERY WITH GALVANIC COATINGS

abstract 1331709016 issue 133 pp. 173 – 185 30.11.2017 ru 4
We have conducted experimental and analytical studies showing the relationship of constant and pulse forms of current sedimentation on the physicochemical properties of chrome coatings: adhesion strength to the substrate, residual stress, fatigue life, elongation and contraction, yield stress, and endurance. We have shown the methods and modes of use of dilute electrolyte of chromium plating with organic additives, is capable of applying a chrome coating on parts of agricultural machines, surpassing the properties of the coatings obtained from electrolytes that are recommended by the GOST standards. The proposed hardening chemical-thermal coating technology for chromium in the manufacture and repairing of worn parts of agricultural machinery (rods of hydraulic cylinders, journals of crankshafts, spools, parts, gearboxes and transmissions, etc.), identifies the consumption of additives modifiers, proposed methods for their determination, confirmed by patents for inventions. The proposed technology of worn-out surfaces of parts of agricultural machinery of layer-block structure of the chromium coatings with improved properties. The influence of modifying organic additives on the structure of the intermediate surface film of colloidal trivalent chromium compounds, which in combination with the parameters of the bipolar pulse current allows you to specifically adjust the physical and mechanical properties of crystals of the deposited chromium layer with a grid of cracks, and without them for the required operating conditions of dry friction or oil environments, which increases the durability of the parts during use. The increase in yield, at the current 6-8 %, to 4 times reduces the degree of hydrogenation of the restored details, up to 3 times reduces internal friction, roughness, improves the limits of strength, toughness, elongation and contraction, increases corrosion resistance up to 3 times, obtained chromium coatings
160 kb

CONSTRUCTIVE EFFECTS OF CLOTHES AS A LEADING DIRECTION IN MODERN CLOTHES DESIGN

abstract 1331709019 issue 133 pp. 206 – 214 30.11.2017 ru 1
The article presents the analyzes results of the deconstructive approach to the process of garment designing, which consists in structural defects modeling; it develops the systematization of projected design effects based on the study of modeling defects, analysis of their appearance and methods of elimination. The purpose of the research is the further development of designing methodology of structural defects in sewing products
167 kb

CIRCUIT SOLUTIONS FOR LOW-BUDGET IMPLEMENTATION OF A DISTRIBUTED SYSTEM OF CONTROL OF PARAMETERS OF SOIL SEED FIELDS

abstract 1331709024 issue 133 pp. 288 – 300 30.11.2017 ru 1
Based on the analysis of modern scientific approaches to the construction of complex information-measuring systems, we have formulated a circuit solutions model of a distributed system of control of parameters of soil, the implementation of which will allow to build systems in small businesses
279 kb

RESEARCH OF CHANGE OF INTENSITY OF THE LANDSLIDE PRESSURE OPERATING ON THE CONSTRUCTION AT INFLUENCE OF VARIOUS LOADINGS

abstract 1331709027 issue 133 pp. 320 – 336 30.11.2017 ru 3
Currently, there is increasingly reduced number of the sites convenient for construction. In this regard there is a question of development of new territories, for various reasons which were earlier considered economically unprofitable or unsuitable for construction. Often, for construction in the mountain area it is necessary to carry out construction of objects in landslide territories. However, landslide processes constitute big health hazard and lives of people and also safety of buildings and constructions. The main objective of engineers when performing design and exploration work on landslide territories is the determination of stability of slopes and size of landslide pressure from soil and also identification of the most dangerous combination of loadings which can demand design and construction of a construction against landslide of landslide protection structures with significant load-bearing capacity. The research presented in article allows to define the most dangerous loads affecting the stability of the slope and also of the selection of a protective construction (against landslide). Dependences of change of landslide pressure and coefficient of stability of a slope are received from action of various loadings (both static, and dynamic)
205 kb

NON-ITERATIV METHOD FOR CALCULATING THE ASYNCHRONOUS MOTOR SLIP IN THE TASKS OF AN AGRICULTURAL ELECTRIC DRIVE

abstract 1331709029 issue 133 pp. 347 – 364 30.11.2017 ru 2
The article dwells on the features of the calculation of a branched electric circuit containing one or more asynchronous short-circuited electric motors operating with a load which depends on the parameters of the electric circuit itself. A method for solving the problem of calculating a circuit on the basis of the mathematical perturbation method is proposed
423 kb

RATIONING OF FUEL-LUBRICANTS CONSUMPTION AND PRODUCTIVITY OF TRACTORS BY JOHN DEERE IN THE TYUMEN REGION

abstract 1331709032 issue 133 pp. 402 – 410 30.11.2017 ru 1
The main application of tractors is in agriculture. The share of imports continues to grow in the structure of the agricultural machinery market. In recent years, many foreign tractors and agricultural machines, including John Deere, have been delivered to the fields of the Tyumen region. The rates of productivity and fuel-lubricants consumption for the agro-climatic conditions of the Tyumen region are not available for all tractors with agricultural machines. Therefore, for agricultural producers, their establishment becomes urgent. On the fields of agricultural enterprises of the Tyumen region, studies were conducted to establish the norms for fuel consumption and productivity of John Deere tractors with agricultural machines. The article presents the results of the study. For example, the productivity of a tractor in the «Malyshenskoye» conditions for a field located at a distance of 5-6 km and an average run length of 1,300 m can be in the range of 5.8-6.0 ha / h. Taking into account the natural and climatic conditions of the Tyumen region and the different physicomechanical composition of the soils, as well as the configuration of the fields and the run length during tillage, data were obtained of basic lubricants consumption. Recommendations on the use of fuel-lubricants consumption rates of modern tractors in the performance of various technological operations in agriculture will make it much easier to plan and calculate the operating costs of tractors with agricultural machines
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