scholarly journals Method for Determining the Pressure of a Pneumatic Wheel on the Soil

2021 ◽  
pp. 29-31
Author(s):  
A.N. Zazulya ◽  
◽  
O.B. Filippova ◽  
I. G. Golubev ◽  
◽  
...  
Keyword(s):  
Soil Compaction ◽  
Oscillatory System ◽  
Air Pressure ◽  
Vertical Acceleration ◽  
Optimal Parameters ◽  
Research Results ◽  
Pneumatic Wheel

A method for determining the pressure of a pneumatic wheel on the soil is proposed. The method consists in measuring the magnitude of the vertical acceleration of the axles of a self-propelled vehicle, its speed and air pressure in the tire. The research results allow the developers of vehicles fitted with pneumatic wheels to choose rational characteristics of tires and optimal parameters of the oscillatory system of wheeled tractors, which help to reduce soil compaction.

Investigation of Optimal Air-Driving Fluid Jet Polishing Parameters for the Surface Finish of N-BK7 Optical Glass

2013 ◽  
Vol 135 (1) ◽  
Author(s):  
Pham Huu Loc ◽  
Fang-Jung Shiou ◽  
Zong-Ru Yu ◽  
Wei-Yao Hsu
Keyword(s):  
Surface Roughness ◽  
Surface Finish ◽  
Orthogonal Array ◽  
Optical Glass ◽  
Impact Angle ◽  
Air Pressure ◽  
Standoff Distance ◽  
Optimal Parameters ◽  
Abrasive Material ◽  
Spherical Lens

The aim of this study is to investigate optimal air-driving fluid jet polishing (FJP) parameters by using Taguchi's method to improve surface roughness of N-BK7 optical glass on a machining center. An orthogonal array and the signal-to-noise (S/N) ratio are employed to determinate the optimal polishing parameters, and analysis of variance (ANOVA) is used to identify the main parameters that affect the surface roughness of the N-BK7 optical glass. An air-driving FJP tool is newly designed and fabricated to conduct experiments. To determinate the optimal air-driving FJP parameters, six polishing parameters, namely air pressure, impact angle, standoff distance, the abrasive material, abrasive concentration, and polishing time, are selected as the control factors of experiments. Based on the Taguchi's L18 orthogonal array experimental results and the S/N ratio, the optimal parameters for the N-BK7 optical glass are found. These optimal parameters are to be as follows: an air pressure of 0.490 MPa, an impact angle of 40 deg, a standoff distance of 12 mm, the abrasive material of Al2O3, an abrasive concentration of 10 wt. %, and a polishing time of 30 min. The surface roughness of specimen is improved from Ra = 0.350 μm–0.032 μm by using the optimal air-driving FJP parameters. In addition, the determined optimal polishing parameters for the plane surface are applied to the surface finish of an N-BK7 spherical lens, and the surface roughness of the spherical lens can be improved from Ra = 0.421 μm to 0.202 μm within an area of 283.6 μm × 200 μm.

scholarly journals FORMATION OF PARAMETERS OF FOAMED EXPLOSIVE MIXTURES FOR SEALING SOILS

ScienceRise ◽  
2020 ◽  
pp. 6-12
Author(s):  
Olena Han ◽  
Viktor Boiko ◽  
Viktor Kravets ◽  
Anatolii Han
Keyword(s):  
Ammonium Nitrate ◽  
Soil Compaction ◽  
Large Scale ◽  
Growth Time ◽  
Low Density ◽  
Ultrasonic Radiation ◽  
Research Results ◽  
Loess Soils ◽  
Different Types ◽  
Technological Product

Significant growth rates of construction require large areas prepared in advance. Given the complexity and large scale of construction on subsidence soils, an important issue remains their compaction. On the article, on the parameters of the explosion momentum of TNT-free explosive compositions based on ammonium nitrate (AN) and after ultrasonic treatment of ammonium nitrate were analytically investigated, and their comparison with ammonite №6 and igdanite was also compared. The principles of explosive pulse control by regulating the content and density of explosives due to ultrasonic radiation and foaming of low-density explosive mixtures have been developed and substantiated. Set the minimum value of the peak pressure at the interface "detonation product - environment" from time for foamed explosives after treatment with ultrasonic radiation. The object of research: Reclamation works and construction. Management of compaction of subsidence and flooded soils by directed action of explosive systems. Investigated problem: Taking into account that the method of compaction of subsiding loess soils with the energy of explosion is used in built-up areas, of particular importance is the control of the explosive pulse through the regulation of the content and density of explosives by ultrasonic radiation and foaming of low-density explosive mixtures this is done to ensure the required degree of compaction of the subsidence of the soil mass and to reduce the harmful seismic impact on the surrounding structures. The main scientific results: The dependence of the duration of the explosive pulse growth on the charge radius for different types of low-density explosives has been established, which indicates that the longest growth time of the explosive pulse is observed for charges based on foamed explosives, both conventional and ultrasonic treated. The dependences of the degree of soil compaction during the explosion of overhead charges of different types of explosives in the polymer housing on the specific costs of explosives are obtained. The research results allow to develop technological methods of controlling the parameters of the explosive pulse by using explosive density, which provides the opportunity to increase the efficiency of explosive energy to maintain the required degree of compaction of subsidence loess soils to a certain depth while seismic protection. The area of practical use of the research results: the use of this type of compaction of unstable soil is possible in the construction industry, in the mining industry and in the military. Innovative technological product: the methods of compaction of unstable soil with the energy of the explosion work when changing the parameters of the pulse, which will minimize the loss of energy in the blasting zone and increase the range of a single charge. Scope of the innovative technological product: the application of this method is possible: for compaction of unstable soil before construction, for soil compaction of runways at field airfields, for demining.

scholarly journals Study of Front Wheel Pressure on the Soil of Tractors with a Different Wheel Configuration

2019 ◽  
Vol 13 (1) ◽  
pp. 27-33
Author(s):  
A. A. Akhmetov ◽  
Sh. A.U. Akhmedov
Keyword(s):  
Contact Area ◽  
Soil Compaction ◽  
Seed Layer ◽  
Travel Speed ◽  
Front Wheel ◽  
Air Pressure ◽  
Research Purpose ◽  
Average Pressure ◽  
Ground Clearance ◽  
The Relationship

An increase in the power of the high-clearance tractor with the 3K2 wheel configuration (TTZ-811) and the weight of the machines coupled with it has led to an increase in the pressure of its running elements on the soil. The authors have proposed to replace it with a tractor with the 4K2 wheel configuration with an adjustable ground clearance (TTZ-1033), which has several advantages.Research purposeThe study of the effect of the wheel configuration, travel speed and air pressure in the tire on the tractor's front wheel pressure on the soil.Materials and methodsThe authors have analytically determined the relationship between the contact area of a wheel tire with the soil on the tire parameters and the internal air pressure in it. To take measurements, load TAS607 sensors like with specially made nozzles have been used.Results and discussionIt has been found that under similar conditions, the average pressure on the soil in the layer of 10-50 centimeters across the width of the front wheel tire of TTZ-811 is 19.0-27.6 kilopascals more as compared to TTZ-1033. It has been found that an increase in air pressure in the tire from 1.2 to 2.2 megapascals results in a n increase in average front wheel pressure on the soil in the seed layer (0-10 centimeters) of the TTZ-1033 tractor from 61.9 to 70.8 kilopascals, and of the TTZ-811 tractor – from 63.5 to 79.3 kilopascals. It has been revealed that at a depth of 10 centimeters, the pressure of the front wheel of the TTZ‑1033 tractor averaged 84.9-108.2 kilopascals, and at a depth of 50 centimeters – only 12.2-12.8 kilopascals. Under the same conditions, the average pressure` of the TTZ-811 tractor's front wheel decreases from 78.0-113.3 to 15.3-52.8 kilopascals.ConclusionsThe authors have stated that soil compaction with the front wheels of a tractor can be reduced by replacing a tractor with a 3K2 wheel configuration with a tractor with a 4K2 wheel configuration, as well as by increasing the tractor speed.

scholarly journals RESEARCH RESULTS OF THE DEVICE FOR DRYING AGRICULTURAL CROPS

2020 ◽  
Author(s):  
О.Н. Кухарев ◽  
И.Н. Сёмов ◽  
Н.К. Тимергазин ◽  
В.С. Оськин
Keyword(s):  
Experimental Studies ◽  
Optimal Parameters ◽  
Drying Process ◽  
Technological Parameters ◽  
Microsoft Excel ◽  
Research Results ◽  
Industry Standards ◽  
Private Research ◽  
Fluidized Bed Drying ◽  
Almost All

Хозяйства и операторы розничной сети не всегда могут сохранить полученный урожай в связи с необходимостью постройки овощехранилищ и сложности с соблюдением технологии хранения. В этих условиях выходом из сложившегося положения является сушка овощей. Применение сушки позволяет сохранить все вкусовые качества и почти все витамины. В этих условиях в ФГБОУ ВО «Пензенский ГАУ» разработан опытный образец устройства для сушки сельскохозяйственных культур, позволяющего проводить сушку в кипящем слое. Однако, необходимо провести исследования для совершенствования процесса сушки овощей пневмомеханической сушилкой с обоснованием её конструктивных и технологических параметров. В работе использовались экспериментальные методы: моделирование, наблюдение, эксперимент. Экспериментальные исследования проводились в лабораторных условиях на основе общепринятых методик в соответствии с действующими отраслевыми стандартами, а также разработанных частных методик исследований. Обработка результатов исследований проводилась на ПЭВМ с использованием стандартных компьютерных программ Microsoft Excel, Statistica, КОМПАС-3D. В результате была получена модель процесса сушки и определены оптимальные параметры предлагаемого устройства. Farms and retailers are not always able to preserve the harvest due to the need to build vegetable stores and the difficulty in observing storage technology. Under these conditions, the way out of this situation is the drying of vegetables. The use of drying allows saving all the taste and almost all the vitamins. Under these conditions, Penza State Agrarian University has developed a prototype device for drying crops, allowing for fluidized-bed drying. However, it is necessary to conduct research to improve the drying process of vegetables with a pneumatic-mechanical dryer with justification for its design and technological parameters. The experimental methods were used in the work: modeling, observation, experiment. Experimental studies were carried out in laboratory conditions on the basis of generally accepted methods in accordance with current industry standards, as well as developed private research methods. Processing of the research results was carried out on a PC using standard computer programs Microsoft Excel, Statistica, KOMPAS-3D. As a result, a model of the drying process was obtained and the optimal parameters of the proposed device were determined.

scholarly journals Study on optimal parameter of vibration reduction system TMD-D and DVA for an inverted pendulum type structures and application to tower in the ocean

2010 ◽  
Vol 32 (1) ◽  
pp. 59-69
Author(s):  
Khong Doan Dien ◽  
Nguyen Duy Chinh
Keyword(s):  
Numerical Simulation ◽  
Optimal Design ◽  
Inverted Pendulum ◽  
Optimal Parameter ◽  
Vibration Reduction ◽  
Optimal Parameters ◽  
Pendulum System ◽  
Research Results ◽  
Reduction System

Nguyen Dong Anh, Khong Doan Dien and Nguyen Duy Chinh in [1] have studied the vibration of inverse pendulum system installed with the vibration reduction system TMD-D and DVA. These results implemented by numerical simulation for the articulated tower in the ocean show that the obtained oscillations in some cases with installed absorber increase the amplitude of vibration when compared to the case without absorber. It is a fact that when simulation is employed, the parameters of TMD-D and DVA are chosen arbitrarily without optimal design. In the paper, the authors investigate to find the optimal parameters of the TMD-D and DVA absorbers in order to optimally reduce the vibration for the inverse pendulum system. These research results are applied to reduce the vibration for the articulated tower in the ocean.

scholarly journals The Influence of the Driving Speed and Vertical Acceleration of the Mobile Machine on the Change of Soil Packing

2018 ◽  
Vol 7 (4.3) ◽  
pp. 179 ◽  
Author(s):  
Mykola Artiomov ◽  
Dmytro Klets ◽  
Volodymyr Boldovskyi ◽  
Andrii Makovetsky ◽  
Kateryna Kostyk
Keyword(s):  
Soil Compaction ◽  
Density Variation ◽  
Gear System ◽  
Dynamic Loads ◽  
Vertical Acceleration ◽  
Soil Density ◽  
Driving Speed ◽  
Vertical Accelerations ◽  
Traction Load ◽  
Mobile Machine

The article deals with the processes of changing the vertical forces acting on the propulsion of mobile machines, causing soil compaction when changing the driving speed and vertical accelerations of a mobile machine moving on a deformable soil. The influence of parameters and characteristics of the running gear system of the wheeled tractor, as well as the traction load on the value of vertical accelerations when moving along the soil, is determined. The dependence of the influence of vertical accelerations on the dynamic loads on the axle of the tractor front and rear axles is determined. The dependence of the soil density variation caused by the action of dynamic loads from the propulsion of the tractor front and rear axles has been determined.  

scholarly journals Noncooled (Hg,Cd)Te IR photo detectors in range of 10.6 μm wavelength

2018 ◽  
Vol 19 (12) ◽  
pp. 795-801
Author(s):  
Tadeusz Niedziela
Keyword(s):  
Room Temperature ◽  
Ohmic Contacts ◽  
Energy Gap ◽  
Optimal Parameters ◽  
Thermal Generation ◽  
Ir Radiation ◽  
Research Results ◽  
Parameter Evaluation ◽  
Carrier Recombination ◽  
Photo Detectors

In range of 10.6 μm IR radiation an analysis of noncooled (T = 300 K) (PC) photodiodes and (EMCD) magnetoexlusion detectors with (Hg,Cd)Te was made. The basic detection parameters of these devices are limited by the noise resulting from statistical processes of thermal generation and carrier recombination. The parameter evaluation of related photodiodes demonstrates that the optimal parameters such as: thickness or structure doping on the substrate with a widened energy gap differs each other for structures with ohmic contacts at both ends. In the paper, for photodiodes and magnetoexclusion detectors with (Hg,Cd)Te the research results : optimal photosensitive detection parameters are presented for the room temperature (T=300 K) and acceptable large as well as small (5 and 0.5 W / mm2) densities of the dissipated power.

scholarly journals Factors affecting the change in wheel resistance and track depth of wide-grip sprinkler machines

2020 ◽  
Vol 1 (6) ◽  
pp. 67-71
Author(s):  
L.A. Zhuravleva ◽  
◽  
N.V. Tkhuan ◽  
Keyword(s):  
Permanent Deformation ◽  
Constant Load ◽  
Linear Increase ◽  
Air Pressure ◽  
Geometrical Parameters ◽  
Negative Consequences ◽  
Tire Pressure ◽  
Factors Affecting ◽  
Pneumatic Wheel ◽  
Urgent Task

The operation of sprinkler machines (SM) is accompanied by the formation of a track with un-dercarriages, leading to an increase in resistance to wheel movement and leading to many negative consequences: over-watering of irrigated areas, an increase in energy expended on movement, an increase in soil compaction, etc. The depth of the track and the resistance to wheel movement de-pend on many parameters: soil moisture, irrigation mode, soil bearing capacity, wheel geometry, etc. But the greatest influence is exerted by the load on the wheel axle and the air pressure in the tires. The article presents the results of laboratory studies of installations that simulate the undercar-riage of sprinkler machines, which showed that while maintaining a constant air pressure in the tires, an increase in the axle load of the pneumatic wheel from 0.1 kN to 1.0 kN leads to an increase in the track depth to 4 cm, and also a linear increase in the resistance to wheel movement. With an increase in the pressure generated by the pneumatic wheel, the permanent deformation, the depth of the track, and, consequently, the resistance to movement of the pneumatic wheel increases. The track depth increases by 20% with an increase in tire pressure from 0.5 MPa to 1.0 MPa. With a constant load on the axle of the wheel, the resistance to movement of the pneumatic wheel increases on average by 25% when the air pressure in the tires rises from 0.5 MPa to 1.6 MPa. Optimization of running systems, the ratio of the load on the axle of the wheel, geometrical parameters and characteristics, as well as the air pressure in the tires is an urgent task.

scholarly journals VIBRATION TECHNOLOGIES IN THE RESTORATION OF THE WORKING BODIES OF AGRICULTURAL MACHINES

2021 ◽  
pp. 14-20
Author(s):  
Anatoly Dudnikov ◽  
Volodymyr Dudnyk ◽  
Oleksandr Gorbenko ◽  
Anton Kelemesh
Keyword(s):  
Wear Resistance ◽  
Surface Layer ◽  
Linear Wear ◽  
Optimal Parameters ◽  
Efficient Technology ◽  
Research Results ◽  
Soil Cultivation ◽  
Hardening Treatment ◽  
Optimal Values ◽  
Working Bodies

The paper deals with the use of vibration vibrations in the restoration of the working bodies of agricultural tillage machines operating under conditions of increased abrasive wear. The analysis of the existing methods of their restoration is carried out, the substantiation of the use of vibration hardening treatment in repair production is given. The research carried out on the choice of the optimal parameters of vibration strengthening of the cutting working bodies contributes to an increase in the wear resistance and reliability of soil cultivation equipment. According to the research results, the change in hardness along the depth of the surface layer of cutting elements of the following agricultural tillage machines: plow shares, opener discs of grain seeders and cultivator paws was established. Optimal values of the main parameters of vibration processing of cutting elements of the specified working bodies are experimentally determined and substantiated, which reduce the amount of their wear: amplitude A and vibration frequency of the processing tool n, hardening time t. The change in the magnitude of linear wear along the width of the cutting elements of these parts is shown, as well as data on the intensity of their wear. Experimentally obtained data on the absolute and relative wear of the diameter and thickness of the blade of the opener discs, which made it possible to choose a more efficient technology for their restoration. According to the research results, it was found that the specified parts of soil cultivation equipment had the least wear value; they were restored by welding tires, plates or segments from steel 45, followed by surfacing with sormite and strengthened by vibration deformation. The results of the work will be used to develop technological processes for the restoration of other working bodies of tillage machines by the method of vibration deformation. Annotation The paper deals with the use of vibration vibrations in the restoration of the working bodies of agricultural tillage machines operating under conditions of increased abrasive wear. The analysis of the existing methods of their restoration is carried out, the substantiation of the use of vibration hardening treatment in repair production is given. The research carried out on the choice of the optimal parameters of vibration strengthening of the cutting working bodies contributes to an increase in the wear resistance and reliability of soil cultivation equipment. According to the research results, the change in hardness along the depth of the surface layer of cutting elements of the following agricultural tillage machines: plow shares, opener discs of grain seeders and cultivator paws was established. Optimal values of the main parameters of vibration processing of cutting elements of the specified working bodies are experimentally determined and substantiated, which reduce the amount of their wear: amplitude A and vibration frequency of the processing tool n, hardening time t. The change in the magnitude of linear wear along the width of the cutting elements of these parts is shown, as well as data on the intensity of their wear. Experimentally obtained data on the absolute and relative wear of the diameter and thickness of the blade of the opener discs, which made it possible to choose a more efficient technology for their restoration. According to the research results, it was found that the specified parts of soil cultivation equipment had the least wear value; they were restored by welding tires, plates or segments from steel 45, followed by surfacing with sormite and strengthened by vibration deformation. The results of the work will be used to develop technological processes for the restoration of other working bodies of tillage machines by the method of vibration deformation.

scholarly journals Optimization of Parameters and Operating Modes of Vibration roller

2020 ◽  
Vol 9 (5) ◽  
pp. 579-585
Keyword(s):  
Winter Wheat ◽  
Soil Compaction ◽  
Optimization Criterion ◽  
Regression Equation ◽  
Spring Stiffness ◽  
Optimal Parameters ◽  
Fisher Criterion ◽  
Operating Modes ◽  
Minimum Value ◽  
Modes Of Vibration

The optimal parameters and operating modes of vibratory roller for soil compaction after sowing winter wheat were substantiated. For objective function - the optimum coefficient of variation of density of soil during operation of vibratory roller for compacting winter wheat regression equation was obtained in the planning according to the Вк plan of the experiment. The adequacy of model according to Fisher criterion, the significance and reliability of coefficients of regression equation was established. The response surface obtained by the shape of hyperboloid rotation was studied, twodimensional sections of three factors were constructed on optimization criterion. With its minimum value, the optimal parameters of vibratory roller were established: the mass of roller is 293 kg, the spring stiffness is 11.95 kN/m, the working speed of roller is 9.6 km/h. The minimum value of optimization criterion is 10.43%.

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