scholarly journals Dynamics of the movement of the ripping tool for surface tillage

2021 ◽  
Vol 264 ◽  
pp. 04048
Author(s):  
Urol Abdurakhmonov ◽  
Bakhodir Juraev
Keyword(s):  
Experimental Studies ◽  
Classical Mechanics ◽  
Physical And Mechanical Properties ◽  
Tension Force ◽  
Design Parameters ◽  
Disturbing Force ◽  
Processing Depth ◽  
Frequency Changes ◽  
The Stability ◽  
Attachment Mechanism

The study aims to analyze the stability of the movement of the ripper tool for surface tillage. The basic principles and methods of classical mechanics, mathematical analysis, and statistics were used in this study. The dynamics of the movement of a ripper tool for surface tillage are considered, depending on the forces acting on it and its design parameters. A computational dynamic model is developed, and an equation describing the angular oscillations of the longitudinal links of the parallelogram ripper mechanism is obtained. It is established that the uniformity of the depth of the cultivator depends on the amplitude and frequency changes of the components of the disturbing force, physical and mechanical properties of the soil, the moment of inertia of the Ripper, the length of the longitudinal links parallelogram mechanism, the forces of the pre-tension pressure springs, and its stiffness. It is established that the required uniformity of the depth of tillage can be achieved by selecting the pre-tension force of the pressure spring and its rigidity. Theoretical and experimental studies have established that the required uniformity of the processing depth with minimal energy consumption of the soil is provided with a pre-tension force of the pressure spring of the ripper attachment mechanism of 350 n, spring stiffness of 40 n / cm, and a speed of 2.0 m/s.

scholarly journals Optimalization of Design Parameters of Experimental Installation Concerning Preparation of Liquid Feed Mixtures

Processes ◽  
2021 ◽  
Vol 9 (12) ◽  
pp. 2104
Author(s):  
Pavel Solonscikov ◽  
Jan Barwicki ◽  
Peter Savinyh ◽  
Marek Gaworski
Keyword(s):  
Initial Conditions ◽  
Experimental Studies ◽  
Classical Mechanics ◽  
Electrical Energy ◽  
Design Parameters ◽  
Regression Equations ◽  
Liquid Feed ◽  
Main Factors ◽  
The Mathematical Model ◽  
Theoretical Mechanics

The article describes the initial conditions for the development of universal mechanization means for the process of mixing dry and liquid components. The essence of the method is to study the motion of a particle with different constructive and physical properties of the medium. The mathematical model of particle motion is based on theoretical mechanics and hydraulics. In this case, the main purpose of the study is to find the optimal design parameters for the installation. At the beginning, a theoretical analysis of the installation was carried out using the methods of classical mechanics and hydraulics. Experimental studies were carried out in several stages. At the beginning, one-factor experiments were conducted, followed by allocating the main factors and determining their interaction. Then, using the methods of planning the experiment, we obtained the regression equations and further optimized the parameters to summarize the main findings of the article. Modern installations should have versatility in any technological line; for example, an installation is presented that can not only mix, but further transport the mixture like a conventional pump, while providing a dosing device that is necessary for the feeding of dry components. Theoretical studies have been carried out in which the design of the impeller is substantiated at various speeds. Experimental studies to determine the design parameters of the installation are in continuous operation. The degree of homogeneity was Θ = 74%, with β2 = 80 … 100° and βst = 65 … 102°, while the value of the consumption of electrical energy is equal to Eel = 0.265 … 0.28 kWh/t.

scholarly journals Investigation of stress field parameters at deep horizons of the Gayskoye field**

2020 ◽  
Vol 192 ◽  
pp. 01028
Author(s):  
Sergey Sentyabov ◽  
Albert Zubkov
Keyword(s):  
Rock Mass ◽  
Experimental Studies ◽  
Physical And Mechanical Properties ◽  
Strength Properties ◽  
Concrete Lining ◽  
Complex Structures ◽  
Mining Operations ◽  
Volumetric Expansion ◽  
Shaft Lining ◽  
The Stability

The extraction of solid minerals is associated with the penetration of man into the subsoil by creating either relatively simple or extremely complex structures. All mining operations can be safely and efficiently carried out only on the basis of calculating the stability of these structures, which is based on knowledge of the physical and mechanical properties, the stress state of the rock mass and the patterns of their redistribution and formation in mountain structures. The presented studies confirmed the regularities of the formation of natural stresses in the rock mass, which is the sum of gravitational, static tectonic and variable components, which are formed as a result of uniform periodic volumetric expansion and contraction of the Earth. The problem of shaft stability is due to the need to solve problems to determine the level of stress-strain state and strength properties in concrete lining. The parameters of stresses in the shaft lining and monitoring of their changes were determined using the method of measuring unloading deformations. When analyzing the stresses obtained experimentally by analytical means in the concrete lining of mine shafts, a connection was established with the results of measurements in the rock mass on the basis of 50 meters. Based on the experiment, it was confirmed that theoretical and experimental studies prove that a hierarchically blocky massif of magmatic and metamorphic rocks behaves as an elastic and isotropic medium and changes in natural stresses in the massif Δ on the basis of 5-7 ranks of geoblocks, on the contour of the trunk based on 2 –3 ranks of geoblocks and in the concrete lining of mine shafts Δσb obey this law.

scholarly journals Front-mounted plow for smooth, non-furrow plowing with offsets

2021 ◽  
Vol 304 ◽  
pp. 03013
Author(s):  
Uktam Umurzakov ◽  
Farmon Мамаtov ◽  
Bakhadir Mirzaev ◽  
Sherzod Kurbаnov ◽  
Sunatullo Badalov ◽  
...  
Keyword(s):  
Technological Process ◽  
Mathematical Analysis ◽  
Performance Indicators ◽  
Experimental Studies ◽  
Classical Mechanics ◽  
Direct Costs ◽  
Basic Principles ◽  
Processing Depth

The purpose of the study was the development of a front plow with angle clamps, which performs, smooth plowing. The authors have developed an improved front plow with angle clamps. The constructive scheme of the plow has been given. The basic principles and methods of classical mechanics, mathematical analysis and statistics were used in this study. Experimental studies have justified the processing depth within the limits of 10-12. 5 cm and the width of the capture of the angle is within the range of 7.5-10 cm. Economic tests have established that the developed front plow reliably performs the specified technological process and its performance indicators meet agrotechnical requirements. The use of a frontal plow for smooth, plowing provides a reduction in direct costs for processing 1 hectare of area compared to the technical means used by 26.8%.

scholarly journals RESEARCH OF THE BURROWING SHARE OF A MACHINE FOR HARVESTING VEGETABLES AND ONIONS UNDER LABORATORY CONDITIONS

2021 ◽  
pp. 238-246
Author(s):  
Alexey Dorokhov ◽  
A.V. Sibirev ◽  
Alexandr Aksenov ◽  
Nikolay Sazonov
Keyword(s):  
Soil Layer ◽  
Experimental Studies ◽  
Physical And Mechanical Properties ◽  
Optimization Criterion ◽  
Statistical Characteristics ◽  
Design Parameters ◽  
Potato Tubers ◽  
Root Crops ◽  
Working Bodies ◽  
Significant Factors

It was found that the extraction of a tuberous heap, namely potatoes, with a digging working body with a movable frame, has the most significant drawback, which is that when the depth of the burrowing share tip is changed, the angle of its inclination changes, which negatively affects the chipping of the soil layer and leads to the deterioration of the transportation of the excavated soil layer to the separating working bodies, for which it is necessary to determine and clarify the main technological and design parameters of the developed intake plough share for digging / picking up root crops and bulbs due to the fact that potato tubers and onion bulbs have different size and mass and physical and mechanical properties. A method has been developed for determining the amount of supply of a heap of onion sets from the surface of the digging share to the separating working bodies, the required soil moisture necessary for research. The methodology and results of experimental studies to determine the decrease in the content of soil impurities in the gathering heap of onions are presented, the main statistical characteristics of the experiment are reflected. Based on the results of the screening experiment, significant factors have been established that have a decisive effect on the selected optimization criterion: spring preload, determined by the spring length and the forward speed of the digging share. It was found that the minimum possible amount of soil impurities when extracting onions from the soil is 24.8%. It depends on the values of the investigated factors, values that should be set in the interval: the length of the spring L_PPR=0.02-0.04 m and the speed of the moving share v_L=1.2-1.4 m/s.

scholarly journals OPTIMISING THE DESIGN PARAMETERS OF A FILTER RESPIRATOR

2021 ◽  
Vol 37 (4) ◽  
pp. 25-34
Author(s):  
S. Cheberyachko ◽  
L. Tretiakova ◽  
Yu. Cheberyachko
Keyword(s):  
Mathematical Model ◽  
Personal Protective Equipment ◽  
Experimental Studies ◽  
Target Function ◽  
Face Mask ◽  
Tension Force ◽  
Design Parameters ◽  
Protective Equipment ◽  
Power Relationship ◽  
Force Output

Purpose. The optimum length choice of the headband insert for a dust filter respirator. Design/methodology/approach. The method of experimental planning has been applied to determine the interpolation (regression) and optimisation dependencies of the filter respirator process. The dominant variables for the respirator were selected based on experimental studies.  Input controlled variables for mathematical model are length of tape insertion and headband tension force, output parameter is volume of contaminated air suction under face mask. A regression power relationship between the variables has been established. The recall function was approximated by a second-order non-linear mathematical model. The method of least squares was applied in determining the coefficients at the control variables. Regression dependencies and additional constraints on protective and ergonomic requirements have been used in the optimisation calculations. Conclusions. The solution of the set tasks were the following results: the nonlinear mathematical model more adequately characterizes the respirator use process compared to the linear model of the first order. Relative error between experimental and calculated values of air intake does not exceed 0.6 %. The optimization task is formulated with the regression model. The target function and constraints have been defined with safety and ergonomic requirements. The target function does not have an extremum within the defined constraints. The optimum insertion length was determined graphically and was 2–3.2 cm, the headband tension force does not exceed 5 H With this parameter. Research limitations/consequences. The proposed method is universal in determining the optimum parameters for all types of personal protective equipment. Practical implications: the choice of respirator design parameters can be made using experimentation-surface fitting. Originality/value. The proposed method makes it possible to decline heuristic design methods and establish analytical relationships between the requirements and parameters of individual elements of personal protective equipment.

EXPERIMENTAL STUDIES OF REINFORCED CONCRETE STRUCTURES WITH CROSS-SHAPED SPATIAL CRACK UNDER TORSION WITH BENDING

2020 ◽  
Vol 92 (6) ◽  
pp. 13-25
Author(s):  
Vl.I. KOLCHUNOV ◽  
◽  
A.I. DEMYANOV ◽  
M.M. MIHAILOV ◽  
◽  
...  
Keyword(s):  
Reinforced Concrete ◽  
Experimental Determination ◽  
Calculation Method ◽  
Experimental Studies ◽  
Concrete Structures ◽  
Design Parameters ◽  
Reinforced Concrete Structures ◽  
Experimental Scheme

The article offers a method and program for experimental studies of reinforced concrete structures with cross-shaped spatial crack under torsion with bending, the main purpose of which is to check the design assumptions and experimental determination of the design parameters of the proposed calculation method. The conducted experimental studies provide an opportunity to test the proposed calculation apparatus and clarify the regularities for determining deflections, angles of rotation of extreme sections, and stresses in the compressed zone of concrete. For analysis, the article presents a typical experimental scheme for the formation and development of cracks in the form of a sweep, as well as characteristic graphs of the dependence of the angles of rotation of end sections.

Development of the Snoek Anelastic Relaxation Correlated with Oxygen in β-Ti Alloys

2019 ◽  
Vol 298 ◽  
pp. 59-63 ◽  
Author(s):  
Zheng Cun Zhou ◽  
J. Du ◽  
S.Y. Gu ◽  
Y.J. Yan
Keyword(s):  
Internal Friction ◽  
Physical And Mechanical Properties ◽  
Peak Height ◽  
Relaxation Peak ◽  
Interstitial Oxygen ◽  
Internal Friction Peak ◽  
Β Phase ◽  
Ti Alloys ◽  
Interstitial Atoms ◽  
The Stability

The β-Ti alloys exhibit excellent shape memory effect and superelastic properties. The interstitial atoms in the alloys have important effect on their physical and mechanical properties. For the interstitial atoms, the internal friction technique can be used to detect their distributions and status in the alloys. The anelastic relaxation in β-Ti alloys is discussed in this paper. β-Ti alloys possesses bcc (body center body) structure. The oxygen (O) atoms in in the alloys is difficult to be removed. The O atoms located at the octahedral sites in the alloys will produce relaxation under cycle stress. In addition, the interaction between the interstitial atoms and substitute atoms, e.g., Nb-O,Ti-O can also produce relaxation. Therefore, the observed relaxational internal friction peak during the measuring of internal friction is widened. The widened multiple relaxation peak can be revolved into Debye,s elemental peaks in Ti-based alloys. The relaxation peak is associated with oxygen movements in lattices under the application of cycle stress and the interactions of oxygen-substitute atoms in metastable β phase (βM) phase for the water-cooled specimens and in the stable β (βS) phase for the as-sintered specimens. The damping peak height is not only associated with the interstitial oxygen, but also the stability and number of βM in the alloys.

scholarly journals Mortars with Recycled Aggregates from Building-Related Processes: A ‘Four-Step’ Methodological Proposal for a Review

2021 ◽  
Vol 13 (5) ◽  
pp. 2756
Author(s):  
Federica Vitale ◽  
Maurizio Nicolella
Keyword(s):  
Building Materials ◽  
Thermal Analyses ◽  
Construction Materials ◽  
Physical And Mechanical Properties ◽  
Research Trends ◽  
Mix Design ◽  
Recycled Aggregates ◽  
Design Parameters ◽  
Natural Aggregates ◽  
By Products

Because the production of aggregates for mortar and concrete is no longer sustainable, many attempts have been made to replace natural aggregates (NA) with recycled aggregates (RA) sourced from factories, recycling centers, and human activities such as construction and demolition works (C&D). This article reviews papers concerning mortars with fine RA from C&D debris, and from the by-products of the manufacturing and recycling processes of building materials. A four-step methodology based on searching, screening, clustering, and summarizing was proposed. The clustering variables were the type of aggregate, mix design parameters, tested properties, patents, and availability on the market. The number and the type of the clustering variables of each paper were analysed and compared. The results showed that the mortars were mainly characterized through their physical and mechanical properties, whereas few durability and thermal analyses were carried out. Moreover, few fine RA were sourced from the production waste of construction materials. Finally, there were no patents or products available on the market. The outcomes presented in this paper underlined the research trends that are useful to improve the knowledge on the suitability of fine RA from building-related processes in mortars.

scholarly journals Performance Evaluation of Heading-and-Winning Machines in the Conditions of Potash Mines

2021 ◽  
Vol 11 (8) ◽  
pp. 3444
Author(s):  
Sergey A. Lavrenko ◽  
Dmitriy I. Shishlyannikov
Keyword(s):  
Energy Efficiency ◽  
Experimental Studies ◽  
Efficiency Coefficient ◽  
Mechanized Method ◽  
Methodological Approaches ◽  
The Stability ◽  
Technical Solutions ◽  
Potash Mine ◽  
Complex Indicators ◽  
Potassium Magnesium

The authors focus on the process of potash ore production by a mechanized method. They show that currently there are no approved procedures for assessing the performance of heading-and-winning machines operating in the conditions of potash mines. This causes difficulties in determining the field of application of heading-and-winning machines, complicates the search for implicit technical solutions for the modernisation of existing models of mining units, prohibits real-time monitoring of the stability of stope-based technological processes and makes it difficult to assess the performance of the services concerning mining enterprises. The work represents an aggregate assessment of the performance of heading-and-winning machines for potash mines by determining complex indicators describing the technological and technical levels of organising the work in stopes. Such indicators are the coefficients of productivity and energy efficiency, respectively. Experimental studies have been carried out in the conditions of the potash mine of the Verkhnekamskoye potassium-magnesium salt deposit to assess the performance of the latest and most productive Ural-20R heading-and-winning machines manufactured in Russia. Using the above methodological approaches, this paper shows that the unsatisfactory technological performance of the studied machine is due to the low productivity of the mine district transport. The average productivity coefficient was 0.29. At the same time, high values of the energy efficiency coefficient show that the productivity of the machine is on par with design conditions.

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