05.00.00 Technical science
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ANALYSIS OF WIND TURBINES FOR ELECTRIC POWER STATIONS WITH LOW CAPACITY
DescriptionThere were analyzed wind turbines for electric power stations with low capacity, considered advantages and disadvantages of wind turbines, which have vertical and horizontal rotation axes, demonstrated efficiency of vertical axial wind turbines and determined the fields of its application
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Description
Results of experimental researches of determination of corn stems rolling speed in different places of corn- harvester rolls have been shown. Opportunity of corn-harvester work under speed of 12-15 km/h and increased frequency of rolls rotation was analyzed. Available corn-harvester working regime with regard of intensification of harvesting process was chosen in the result of theoretical and experimental researches.
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Description
The article analyzes the state of the dairy industry at the present stage. The efficiency of using concen-trates of melons in the production of multicom-ponent dairy dessert has been proved. The positive influence of concentrates tested on the structural and mechanical properties of jelly dessert, organoleptic and nutritional value of the product has been shown. We have also revealed the reduction in the concentration of the gelling agent in jelly
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In the article we have determined the dependence of the extreme mass of the counterweight from me-chanical drive parameters and chart movement of the executive body
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The possibility of reducing dynamic loads on the driving elements of hydraulic manipulator with a combination of motions of the three links is theoretically justified and confirmed by tests
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The existing settlement modes of loading of wheels of cars are defined for the conditions which are closest to road service conditions and are reflected in the existing standards. However these standards can't be applied to an assessment of functional qualities of systems of cushioning the cars which are operated in the conditions of agricultural production. The small step of roughnesses, change the cushioned characteristics under the influence of operational factors lead to emergence of the off-design modes of the movement. The purpose of the work was the research of loading of wheels of the car when moving on mulch of grains. For the purpose of obtaining characteristics of the roughnesses influencing car wheels we have recorded a smoothed microprofile of the field and got the statistics, rated autocorrelated function, spectral density of influence of a microprofile. For carrying out the researches the known mathematical model of a car road system was accepted. Influence of speed of the movement, normal rigidity of springs and tires, coefficients of damping of a suspension bracket and tires on vertical fluctuations and loading of wheels of forward and back axes of the car is investigated. The executed researches showed that the movement of the car is followed by fluctuations of indicators of loading of running system with obviously expressed periodic components. The change of the coefficient of damping of a passive suspension bracket and tires in possible limits has no essential impact on loading of wheels. Values of normal roughness of springs of forward and back axes of the car, normal rigidity of tires at which dynamic load of wheels of the car is minimum are established
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Description
In the article, we have motivated the definition of the problem of increasing of efficiency of oil production with complicated conditions. We have also considered general system problems of increasing of the efficiency of oil production with the methods of the improvement and renovations of the equipment: the equipment for optimization of the factor of the extraction of oil; oil well rod pumping units and principles of energy saving on the late stage of the production of the bore holes with complicated condition of exploitation. It is shown, that the equipment allows optimizing the factor of the extraction of oil when developing hard extraction oil stocks, combined with modern technology and methods
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The article is devoted to the analysis of the use of large data processing technology in information systems of territorially distributed complexes
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Description
The influence of auto-displacement in a resonancetunnel diode (RTD) on the dynamic range of amplifiers on these diodes is considered in the article. The amplification at resonance frequency is considered and the influence of higher harmonics is not taken into account, since they do not create a significant voltage drop at the nonlinear resistance of the diode. It is assumed that the gain will be sufficiently large, and then the nature of the dependence of the gain factors on the degree of regeneration will be the same for amplifiers "per pass" and "reflection". This allows us to consider the problem for both types of amplifiers on the RTD. The types of amplitude characteristics , which are possible for the RTD amplifier, are considered. The dependences of the parameter determining the dynamic range of the amplifier on the position of the operating point for several values of the product of the resistance on the direct current of the supply circuit are calculated for the value of the modulus of the maximum negative conductivity of the tunnel gap RG max. For each value of RG max for given parameters, you can determine the position of the operating point, which provides the specified amplifier mode. Dependences of the value of the dynamic range are constructed with allowance for auto-displacement and in the absence of auto-displacement for two values of the degree of regeneration. Taking into account autosplacement, two possible types of amplitude characteristics and boundaries of their existence were revealed. For these two types of amplitude characteristics, expressions were obtained that determine the dynamic range of the amplifier
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ANALYSIS OF CIRCULAR INSTRUMENTS WITH FOUR IN-LINE ARRANGEMENT OF THE SPHERICAL DISKS
DescriptionThe main direction of reducing the cost of soil treatment based on resource-saving technologies is the transition to surface treatment of soil with disk tools. Double-row and four-row disc tools are manufactured. Four-row tools significantly increase tillage intensity. In the disk tools, the spherical disc is fixed on the individual pole. Disc headers are equipped with a rigid adjustment fixing the standalone pole to the frame. Recommended operating speed is up to 12 km/h. The advantage of a disc header over the disc harrow is as follows: winding plant residues on the axis are excluded. Disc mulchers are equipped with a spiral bar on which a spherical disk is mounted. The presence of the elastic element allows the working unit to do lowfrequency oscillations during movement. The result of processing is the formation of mulch in the layer of soil, which is a mixture of plant residues and soil particles with a diameter of up to 25 mm. To assess the effectiveness of the disc mulcher and the disc header a unit is composed. The initial data for calculation are as follows: tractor HTZ-150K, the resistivity of the soil is 6 kN/m, disk tool working width is 4 m, operating speed of the disc header is 12 km/h, operating speed of the disc mulcher is 15 km/h. Technical and economic performance of these units is defined during disking the soil. The choice of energy-saving operating regime was made in a well-known manner. Theoretical value of slippage of the leading tractor with disk mulcher was 6%, against 9% with the disc header. Working speed of the mulcher made up 14.07 km/h against 10,89 of the disc header. The performance of the unit with the mulcher made up 16.21 hectares, disc harrow performance is 12,54 ha. Fuel mass flow of mulcher decreased by 29% and made 9.68 kg/ha. Using mulcher for surface treatment of the soil allows to reduce the tillage energy costs thanks to resource-conserving technologies