Volga State University of Technology
Author list of organization
List of articles written by the authors of the organization
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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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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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HYDRAULIC DEVICES FOR HYDROSYSTEM TAILRACE PROTECTION
DescriptionBased on the Karman vortex theory, the calculated dependences for velocity induced by profile action in the flow, lifting force and drag force, acting on the profile, are determined. Calculations, performed in MathCAD, allowed, for the given up-stream velocity, to calculate height of mid-section of the bed-formation profile, width of the profile along the chord, span of the profile, angle of attack, velocity of the induced flow. For the calculated profile parameters, the velocity circulation value, drag force and lifting force are determined. As the bed-formation profiles, it is recommended to use flat plates, frame constructions with transverse ribs in the form of arch, fish-like symmetric or slightly curved profiles. Ways of the profile installation in the flow, depending on the angle of attack, are evaluated: three versions - for symmetric profiles, and six versions - for asymmetric profiles. Diagram of the device for the hydrosystem tailrace protection against erosion is developed on the basis of submerged NACA 0302 profile or profile of Zhukovsky, made of flexible materials, including profiles, system of supporting and regulating ropes, and shore or bottom supports. This design is mobile, intended for the periodic regulation of sediment yield
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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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OPTIMIZATION OF THE FILLABILITY OF CLAW-SHEARING DEVICE
DescriptionDuring the study, the authors have solved the problem of determining the minimum number of operations by optimizing fillability of a claw-shearing device with trees. Sufficient optimality conditions have been obtained. The numerical method for solving the optimization problem was developed. We have also performed a numerical experiment
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OPTIMIZATION OF DESIGN AND TECHNOLOGICAL PARAMETERS OF A DEVICE FOR SOIL TREATMENT ON TREE FELLING
DescriptionThe results of the optimization of the design and technological parameters of a device for circular soil tillage in forest cutovers have been obtained. The description of the approaches to modeling of circular soil tillage, optimization mathematical model of soil tillage and obtained results are given in the article
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PYROLYSIS OF FOREST RESIDUES IN THE CHARCOAL FURNACE
DescriptionThe article presents the modernization option of the forest residue furnace that allows speeding up the drying process by boosting it. The dependencies, reflecting the influence of the temperature of the drying process on the heat losses of the furnace and the effect of the load and the moisture content of the feedstock to the fuel consumption for the entire drying process, are presented in the article
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Description
The article presents a mathematical model of the reliability of the flexible robotic manipulator, which establishes the relationship between the design parameters of the individual elements of the flexible section of the handling robot and the indicators of reliability section