Volga State University of Technology
Author list of organization
List of articles written by the authors of the organization
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SMALL-SCALE MODELING OF DYNAMIC FACILITIES FOR PROTECTION OF HYDROSYSTEM TAILRACES
DescriptionTo study the formation of plunge basin in the Cheboksary hydroplant, we used a scale model of the spillway dam and all structures in the tailrace, installed in the slot flume. When we passed the flow corresponding to the diversion flow of the hydroplant with a glance to the modeling scale, it was found that the plunge basin was formed behind the end fixing of the spillway apron. To research the dynamic facilities of hydrosystem tailrace protection against erosion, we used a small glass flume with a model of the roundcrested weir. For the experiment, the water-surface elevations were built in the flume without the weir, and the uniform motion area was established. In MathCAD software environment, the curve of the flow of measuring rectangular weir of the flume was created. Because of measurements, the curve of water surface by the flow motion through the round-crested weir was made. As the main criterion for modeling, the criterion of Froude was selected. Scale of modeling of flow parameters was determined. For testing, models of hydrodynamic profile and sail structure with streamforming sluice valves were built. The process of sand washout from the flume bottom and formation of the bottom ridges when installing the profile was photographed. Impact of the profile on the flow and its relation with the formation of the bottom topography were studied. Full-scale values of geometric parameters of the bottom ridges and their movement velocity were established as well
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FEATURES OF KNOWLEDGE ECONOMY IN RUSSIA: THEORY AND PRACTICE
DescriptionThe article identifies the main problems of the knowledge market of modern Russia. The term of "knowledge economy" was clarified. We have also identified characteristic features, specifics, as well as we have proposed the ways of its development
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DEVELOPMENT AND RESEARCH OF THE EXPERIMENTAL EQUIPMENT FOR COMBINED TILLAGE
DescriptionThe article substantiates the necessity of creation the experimental equipment for examination of the power components in the investigated process; a block diagram of the measuring system was presented. We have also developed a method of selecting a mounting location and connection schemes of the sensors, as well as the approbation of the experimental equipment is made in the implementation of a trial of full factorial experiment
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MATHEMATICAL MODEL OF THE PROCESS OF GRANULATION OF RAW WOOD WITH A HIGH DEGREE OF DAMAGE OF ROT
DescriptionThe article presents the mathematical model for determining the temperature after passing trough nozzles of press-granulator, which allows to take into account heat loss through the exterior surface
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MATHEMATICAL MODEL AND FIELD RESEARCH OF FUEL WOOD NATURAL DRYING IN BUNCHES IN THE CUTTING AREA
DescriptionThe purpose of this research is to receive mathematical model of natural drying of the whole trees in bunches in a cutting area based on experimental data. The field research of natural drying from March to October 2015 of the whole trees of pine and birch of different diameter laid definitely in bunches in a cutting area was conducted for this purpose. The mathematical model describing change of moisture content in wood in the course of natural drying in bunches in a cutting area was as a result developed. The received equation of regression defines dependence of average humidity of wood in a bunch from diameter of wood, quantity of a liquid atmospheric precipitation, relative humidity and temperature of air, average speed of the movement of the air blowing in bunch of trees, duration of natural drying. The developed mathematical model allows predicting change of moisture content of wood in the course of natural drying with a margin error less than 5%. Humidity of wood in the course of natural drying from March to October was on average reduced from 52% to 27%. Besides, in article the technology of logging of fuel wood on an energy forest is offered. The technology of stacking of trees in bunches at logging of the fuel wood which is grown up in forest plantations is offered. The results of the research can be used for increase of production efficiency of fuel wood
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THEORETICAL RESEARCH OF AN ENERGYSUPPLYING COMPLEX FOR APIARY BASED ON HYBRID SOLAR PLANT
DescriptionIn the article, we present a simulation mathematical model of an energy-supplying complex of apiary based on hybrid solar plant that establishes the relationship between the design and the operating parameters of the complex with when having conducive winter maintenance of bees. Modeling methodology involves the selection into a mathematical model of multiple levels: level of processes, that directly related with changing of climate parameters inside the hive depending on external factors, level of processes of functioning of the individual components in the complex, which are not directly connected with the processes of changing of climate parameters inside the hive, however, are necessary to ensure favorable conditions for wintering of bees. We have conducted the simulation of the complex based on hybrid solar plant for conditions: the location of apiary in the Republic of Mari El (building for placement of bees for 250 bee colonies, the number of photovoltaic modules – 10, wind power plant area – 18 m2 , the capacity of the battery – 50 A·h, the heat accumulator capacity – 3 m3 , the time interval – from 14 October to 14 April). As a result of simulation obtained graphs of the changing the thermal battery coolant temperature, the voltage at the battery terminals, the power wind turbine and PV modules, the electrical energy consumption
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Description
The article presents the mathematical models of technological modes of crushing, drying and pressing in the production of pellets from wood raw material with a high degree of rot
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IMPROVING RESOURCES OF ENGINE OIL WITH SPECIAL ADDITIVES ADDED
DescriptionThe article presents investigations of engine oil with the addition of special additives and reactions of the composition in the process of friction on the metal surface, simulating the boundary and hydrodynamic friction
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INTRODUCTION FEATURES OF RED OAK (QUÉRCUS RÚBRA) IN MARI EL REPUBLIC
06.00.00 Agricultural sciences
DescriptionThe research purpose was estimate of the red oak growing suitability in Mari El Republic. To achieve this goal we investigated experienced 44-year-old red oak plantation at the Botanical garden-Institute, determined acorns morphological characteristics of red and English oaks and seedlings grown from them. The evaluation of red oak plantings identified excess of average height and tree diameter in comparison with English oak, but the sanitary condition of both oaks forests was weakened due to the influence of the complex of unfavorable factors. Morphological acorns evaluation showed that the shape factor of acorns of English oak is equal to 1.64, while the red oak is 1.1. Biometrics parameters of red oak bareroote seedlings in the field were higher than English oak bareroote seedlings. In greenhouse biometric parameters of red oak container seedlings had not excess. According to this research, red oak is recommended for use in landscape construction in Mari El Republic
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SECURITY ASSESSMENT PROBLEMS IN SAWMILL EQUIPMENT
DescriptionThe article deals with normative legal documents, regulating safety indicators of equipment, with particular focus on woodworking machinery, including log-processing equipment. General and specific requirements have been highlighted in terms of their analyses. The necessity of safety requirements’ specification in technical guidelines, with reference to construction of industry-specific trend equipment, according to newly accepted national, interstate and international standards for purposes of conformity assessment. Nonconformities were determined on the terms in Technical Guidelines of the Customs Union 021/2011, fundamental documents for woodworking equipment GOST EH 1070 and GOST ISO 12100. Relevant topic issues are declared in this work. Manufactures consider them when risk valuation is performed in point of existing equipment and that, under development non-standard equipment, connected with diversity of normative documents, absence of information about customers’ experience, accidents while operating comparable machinery, etc. The paper emphasizes complications, which participants of standard programs face, namely, development contractors and users, accredited test laboratories and certification bodies, state oversight authorities, when woodworking machinery conformity assessment is performed. The suite of safety metrics was suggested for valuation of log-processing equipment and two-level log frames, particularly, on the basis of technical guidelines requirements TG CU 021/2011 “On machinery and equipment safety”, and standards GOST EH 1070, GOST 12.2.026.0, GOST R 5454123 and GOST R 51898. The necessity of standard realization was demonstrated in relevance to obsolete methods of control over equipment (geometric and technology accuracy). GOST 10294 was accepted in 1990 and hasn’t been actualized since that time. That is the reason why it seems impossible to estimate equipment condition, as recommended monitoring facilities are missing