05.00.00 Technical science
-
IMPROVING THE EFFICIENCY OF HARVESTING OPERATIONS (ON THE EXAMPLE OF POTATOES)
DescriptionThe article presents the scheme-constructive solution for the separating working organ of the potato harvester, that allows to improve separation efficiency of root crops off the stems tops of vegetable and plant residues in difficult harvesting conditions, as well as reducing the amount of damage to tubers
-
TO THE PROOF OF THE NONDEMOUNTABLE METHOD OF REPAIR OF THE HIGH PRESSURE FUEL PUMP
DescriptionThis article discusses the application of the method of selective transfer to restore the plunger pairs of high pressure fuel pumps of diesel engines. To restore plunger pairs the authors of the article propose to use an anti-friction repair-and-renewal composition on the basis of the mineral serpentinite
-
Description
At calculations, we have used the next assumptions: 1. Not excluded systematic errors distributed with equal probability; 2. Random errors are normally distributed; 3. Total error is the composition of not excluded systematic and random errors. In calculating of measurement error of pressure, we proceeded from working formula. The confidence interval of each variable less than instrumental error, therefore, to characterize the total error of the measured value P, we use the instrumental errors of all variables. In estimating of temperature measurement error was consider the systematic and random error. To estimate random error we used measurement data of the specific volume of water on six isotherms. Obtained values were compared with published data. As an approximate estimate of the random error of our experimental data, we can take it as a total for all the isotherms of the specific volume in comparison with the published data. For studied fractions confidence limit of total error of measurement results located in the range of 0,03 ч 0,1%. At temperatures close to the critical increasing influence of errors of reference and the error associated with the introduction of corrections on the thermal expansion of the piezometer. In the two-phase area confidence limit of total error increases and located between 0,08 ч 0,15%. This is due to the sharp increase in this area of reference error of pressure and error in determining to the weight of the substance in the piezometer
-
IMPROVEMENT OF INTERNATIONAL WOOD TRANSPORTATION
DescriptionThe article gives an example of usage of the tool for round-wood transport planning from the Decision Support System “Forest Logistic Toolset” for com-pare of two approaches to the organization of international wood transportation
-
RESEARCH METHODS OF SATURATED VAPOR PRESSURE AND EXPERIMENTAL INSTALLATIONS
DescriptionThe static method is the most common, because it is applicable for measuring SVP of substances in wide ranges of temperatures and pressures. The essence of the method consists in measuring of vapor pressure in equilibrium with its liquid at a given temperature. Dynamic method is based on measurement of the boiling point of the liquid at a certain pressure. Saturation method of moving gas used in the case when the SVP does not exceed a few mm Hg. The method consists the following: the liquid is passed through the inert gas and saturated with vapor of liquids and then it flows into a cooler where the absorbed vapors are condensed. Knowing the amount of absorbed liquid and gas, as well as their molecular weight, allow us calculate saturated vapor pressure of the liquid. Knudsen effusion method is applicable for the measurement of very low pressures (up to 100 Pa). This method consists in researching of depending between the pressure and volume of saturated steam at a constant temperature. At the point of saturation an isotherm should have a break and turn into a straight line. Chromatographic method is based on complete chromatographic analysis of liquid and calculating the sum of partial pressures of all mixture components. Also, the article has a description of existing experimental installation for these researches and their advantages and disadvantages compared with each other
-
CONTROLLING SMALL MOVEMENTS OF ULTRA PRECISE DC ELECTRIC DRIVE WITH ELASTIC SHAFTING
DescriptionControl of the movement and positioning are the most intensive tasks of automatic control and regulation. However, these problems must be solved in the automation objects such as assembly and production lines, manufacturing machines, conveyors, hoisting machines, packaging machines, filling lines for liquids, metal-working machines. One problem lies in the fact that all the real drives are connected to the actuators with not perfectly tough shafting, but has some elasticity. This leads to the difficulty of motion of the executive body of the drive automatic control systems which consists of signal source generating signal due optimum speed diagrams for small movements of electric drive’s actuating device and automatic regulation system, which allows to work out optimum speed diagrams for small movements of electric drive’s actuating device with ultra-precision. In this article were developed optimum speed diagram for small movements of ultra-precise electric drive with elastic shafting. Were have identified all parameters of diagrams and its range of existence and also developed a device for generating the optimum speed diagram for small movements of ultra-precise electric drive with elastic shafting. The implementation of the proposed hardware software complex will significantly improve the accuracy of motion actuators of various ultra- precise DC drives
-
THE STANDARDIZATION OF TERMS IN THE FIELD OF NANOTECHNOLOGIES (PART 2)
DescriptionThe article describes the existing standards and draft standards for the terms in the field of nanotechnology. The generalization of specific terminology in the field of nanotechnology, the terms used to define the nanostructures, carbon nanomaterials, nanostructured materials have been presented
-
CALCULATION OF MAGNETIC RESISTANCE OF A CHISEL WORKING ORGAN FOR FIBREWISE SUBSURFACE TILLAGE
DescriptionThe article presents a calculation of traction resistance chisel working organ for layered subsurface soil treatment and proposed the construction of a working body for subsurface tillage with an elliptical element. We have also included a comparative analysis of traction resistance of workers to the waterline and moldboard tillage
-
MEANS OF SMALL MECHANIZATION AS A BASIS OF MODERN PFF AND PBF IN SMALL FORMS OF MANAGEMENT
DescriptionThe support and the development of small forms of management in agroindustrial complex of the Krasnodar region is one of the priority trends in development of agriculture of our region and country in whole. Especially it is actual in last economic events and restructuring of economic balance concerning to the financing of AIC in our country. In the article there was a question of importance of small mechanization means in limits of use of PFF and PBF as forms of import of replacement in modern economic conditions. There was presented a replacement of manual labor with mechanical one, use of less powerful energy sources such as minimotocultivators and tractors to 1,4 t.s. and there was touched the question of use of small mechanization means in the conditions of limited space with the application of highly productive hinged equipment. There was considered the question of influence and use of small mechanization means in small forms of management, there were shown the problems of provision and restructuring of park of machinery and transition on new technology with the use of less powerful means of mechanization in detail. The advantage of use of present approach which is used in the writing of the article is an exact indication of the problem of use of motocultivators and ways of its decision and application in farms
-
Description
The article discusses the new technical solutions and the technology of undercrown micro-irrigation of horticultural crops, taking into account the formation of their root system and circuit humidification