05.00.00 Technical science
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Description
A method is considered, on the concrete example of hothouses of type of 6D, for calculation of bearing strength of overhead and lower belts of farms of coverage. The vital necessity of deep analysis of the question of bearing strength appeared in the light of satisfied mass erection of hothouses constructions of which are bought in the countries of Near East. However, a simple transfer of constructions of hothouses made in the countries of Near East can not be successful on the territory of the Russian Federation. These constructions of hothouses can not be maintained in some conditions, according to service exploitation, like snow loadings, in other cases - wind loadings, and in third case, a construction can collapse without visible reasons. The conducted successive static, dynamic and seismic analysis, executed due to the normative documents and the norms of supplier operating on the territory of the Russian Federation, in attachment to the real sections of bearings structural elements, allowed us expose the stated below percentage of the use of the examined elements of constructions. Lower belt of farms of coverage: on the norms of the Russian Federation, on the first maximum state percent of the use – 395 %; there is a percent of the use on the second maximum state – 999 %; on the norms of the Russian Federation taking into account loadings of supplier, on the first maximum state percent of the use – 339,3 %; there is a percent of the use on the second maximum state – 999 %. Overhead belt of farms of coverage: on the norms of the Russian Federation, on the first maximum state percent of the use – 495,2%; there is a percent of the use on the second maximum state – 361,4 %; on the norms of the Russian Federation taking into account loadings of supplier, on the first maximum state percent of the use – 150,8 %; there is a percent of the use on the second maximum state – 146,2%. Analysis presented allows establishing that at the load of overhead and lower belts of farms of coverage of hothouses, by combinations of loadings characteristic for the place of location of hothouse of type of 6d, their bearing strength, and buildings in general can not be provided
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THE CALCULATION OF THE FOUNDATION SETTLEMENT OVER THE PLATE INVESTI-GATION DATA
DescriptionThe basis of foundation settlement modeling over the plate testing has been offered. The similarity criteria were formulated so as the formulas for settling incre-ments calculation versus to setting pressure increments on the base of foundation. New principle of admissible pressure on the base of foundation has been suggested
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CALCULATION OF THE BASIC PARAMETERS OF THE SPREADER OF BULK MATERIALS
DescriptionThe article deals with the calculation of basic parameters of making bulk materials on the surface of the field. This calculation makes it possible to obtain data on the required amount of particulate matter
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CALCULATION OF RESONANT FREQUENCY IN AN ELECTRO-OZONIZER AT THE BURNING CURRENT
DescriptionIn the article the presented questions of theoretical research of processes of an electric resonance of the generator of ozone were discussed and their influence on productivity and electro-ozonizer efficiency was also defined
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CALCULATION OF ROLLER CHAIN DRIVE WITH INTERNAL TEETH
DescriptionWe have presented a comprehensive calculation of chain drive with internal teeth, comprising: geometric calculations, power and dynamic parameters of the transmission, as well as a method for fabricating the sprocket with internal teeth and wear prediction model of roller chain
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CALCULATION OF WARMING IN PRELIMINARY DEFORMED RUBBER CYLINDER AT HARMONIOUS LOADING
DescriptionIn the present article the problem about harmonious loading of preliminary compressed rubber cylinder is solved on the basis of the defining parities received during work
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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
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CALCULATION OF THE UNSTEADY WATER LINE IN THE KRASNODAR SUBURBAN CHANNEL FOR WATER MEASUREMENT
DescriptionLow level of water accounting and poor control in water distribution in the irrigation system are the main negative factors of industrial influence on irrigated natural complexes. Complex ecosystem way to control water resources involves qualitative improvement and optimization of all parts and elements of irrigation system, from the headwater pool, main channels to local water distribution channels. In this regard, when engineering, constructing, using some new and reconstructed old irrigated systems, the most important problems are the optimization of water use from natural water resources, development and use of highly efficient water-saving and energy-saving technologies of water distribution and water use in the irrigation system. The problem of economical and efficient consumption of water resources on the studied water complex cannot be solved successfully without any related consideration of water accounting and water consumption questions based on system principles. System principles are supposed to collect, analyze and use the information, with the help of complex technical means, which are used for water measurement in conditions of water charges, and for the purpose to control the technological processes of water supply and water drainage, when the needs of water users are satisfied and the environment get less damage. In the work, we study the mathematical calculation of the unsteady water line in the Krasnodar suburban channel for water measurement. The imitated research of hydraulic processes were carried out on the mathematical model of water measurement, based on the characteristic methods, with the use of analytical solution of ordinary differential equations of the initial characteristics. The use of the considered method of water measurement in irrigation channels with the use of analytical solution of ordinary differential equations of initial characteristics will allow to optimize the processes of water measurement and to minimize idle and non-technological discharges of water from the system
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Description
The calculation of pumping equipment and piping network parameters is presented. The method of cutting impeller pump diameter for optimal performance of pump unit with piping system on efficiency value is shown. The case of operating the distribution network and pumping station with three pump units D1250-25 is considered. Procedure of construction of loss-of-head curves in pipes, determination of the actual operating parameters of a single pump unit, selection of pump impeller diameter for essentials is indicated. Four points for graphing such curves are presented. According to the first point the whole network is divided into sections with suction, pressure main pipelines and pipelines with changing water flow compared with the previous ones. The second point involves definition of the electrical resistivity of each site. The resistance of network analyzer is determined in the third point, the loss-of -head of the whole network is determined in the fourth point. The article presents the scheme of pumping station with three pump units connected in parallel and a distribution network (Figure1), loss-of-head curves in pipes regardless the number of working pumps (Figure 2), the order of constructing three loss-of-head curves with operating one, two and three pumps with normal and cut pump impeller diameter (Figure 3 ), the order of determination of the actual parameters of pump work characteristics according to combined characteristics of normal and cut pump impeller diameter ( Figure 4) In conclusion, it is stated that the question of proper definition of actual parameters of pumps and the support of these parameters in optimal mode remains open due to the lack of proper methods of constructing loss-of-head curves pipeline. Every similar calculation is preliminary and should be carried out in field conditions
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ESTIMATION AND SELECTION OF THE MOST OPTIMAL VARIANT DRAINING PONDS
DescriptionThis article gives estimation of drying (liquidation) ponds with subsequent selection of the most optimal variant. For example, ponds № 1, 2 have the calculations for the four drainage options: bottom outlet, using a mobile diesel pumping stations, through the siphon outlet, as well as the combined option of draining (via a bottom outlet and mobile pumping stations). The results of the calculation for each of the cases were examined; the article summarizes the estimated parameters, which allow to visualize and choose the most optimal variant of drying, depending on the time of evacuation