scholarly journals GEOMETRIC AND KINEMATIC CHARACTERISTICS OF FEEDER AND THROWER OF MILLING AND ROTARY SNOWBLOWER

2018 ◽  
Vol 15 (5) ◽  
pp. 638-648
Author(s):  
D. S. Aleshkov
Keyword(s):  
Rotor Blade ◽  
Road Network ◽  
Correct Choice ◽  
Angular Speed ◽  
Design Stage ◽  
Kinematic Parameters ◽  
Technological Parameters ◽  
Winter Conditions ◽  
Kinematic Characteristics ◽  
Translational Speed

Introduction.Questions of the maintenance of territories and road network in winter conditions are directly connected with timely and qualitative clearing of roads and territories of snow. Designing and creation effective milling and rotary snowblowers, which work includes some technological operations on snow cleaning, consist in a correct choice of geometrical and kinematic parameters of basic elements. At a design stage the technique, allowing to carry out a choice of the basic technological parameters of such vehicles is necessary and further it would allow to make optimization directly. The purpose of this paper is representation of dependences of the basic technological parameters of the milling and rotary snowblowers and sequence of their choosing.Materials and methods. The paper presents analytical equations connecting geometrical and kinematic characteristics of the feeder, the thrower of milling and rotary snowblower from conditions of maintenance of identical productivity. Moreover, the analysis of the received equations and dependences by choice milling and rotary snowblower parameters is presented. Sequences of the basic geometrical and kinematic parameters’ influence on each other are revealed.Results.As a result, the comparative estimation of the offered and existing equations is made. The character of dependence of angular speed of the throwing device rotation on translational speed of the milling and rotary snowblower and width of the rotor blade is established. On the basis of the received dependences the algorithm of the basic technological parameters’ choice on the milling and rotary snowblowers, proceeding from the minimization condition of the initial parameters’ task are considered.Discussion and conclusion. The presented dependences allow to spend effectively outline designing of new constructions of milling and rotary snowblowers and to carry out optimisation of existing models of milling and rotary snowblowers.

scholarly journals Development and Rationale of Two-Disk Operating Body of Agricultural Machine for Tillage

2021 ◽  
Vol 20 (5) ◽  
pp. 383-389
Author(s):  
A. S. Ivanov ◽  
M. S. Puzyrev ◽  
E. M. Chikishev
Keyword(s):  
Energy Consumption ◽  
Energy Intensity ◽  
Operating Mode ◽  
Angular Speed ◽  
Technological Parameters ◽  
Agricultural Machine ◽  
Ac Motors ◽  
Translational Speed ◽  
Agricultural Machines

One of the main problems in the design of agricultural machines, including tillage machines, is to ensure the optimal energy intensity of various technological operations. The design, kinematic and technological parameters of rotary tillage machines have a significant impact on the indicators of the energy intensity of the process and the quality of tillage. These parameters include the diameter of the operating body of the agricultural machine, the angular speed and rotational speed of the disks, the number of cutting elements, the translational speed of the operating body, the height of the ridge formed during soil cultivation, the thickness of the cut chips. An important agrotechnical parameter of a rotary tillage machine is the ridging of the furrow bottom. The height of the ridges formed should not be less than 20 % of the depth of the cultivated soil. Currently, in order to ensure the required height of the ridges in the designs of rotary machines, there are a number of restrictions that determine the operating mode and parameters of the units. The degree of influence of the parameters of the developed operating body and the energy consumption on the quality of tillage has been assessed in the process of the research. The experiments have been carried out on an installation that included an operating body, a power unit, control and instrumentation equipment. As the power section, AC motors with a phase rotor were used, the power of which was 0.75 and 1.50 kW, and the speed of rotation was 920, 1500 and 3000 rpm. The parameters have been set that allow to reduce the energy consumption for tillage by 11–17 %, compared to existing machines, and ensure the alignment of the furrow bottom by up to 80 %.

KINEMATIC FEATURES OF THE LAPPING PROCESS AND DETERMINATION OF ITS BASIC PARAMETERS

2020 ◽  
Vol 7 (3) ◽  
pp. 23-28
Author(s):  
EZIZ SARVAN SHIRVAN ◽  
Keyword(s):  
Dynamic Properties ◽  
Cutting Speed ◽  
Equilibrium System ◽  
Technological Parameters ◽  
Kinematic Characteristics ◽  
Angular Velocities ◽  
Basic Parameters ◽  
Grinding Tool ◽  
Mathematical Relationships ◽  
Analytical Expressions

This paper discusses the kinematic characteristics of lapping process and the main parameters of the process. It was determined that the influencing degree of technological parameters to the forming surface and processes. It was projected the construction of the lapping head for processing of internal cylindrical surfaces, scheme of the lapping operation and graphic description of the forces influencing. The relationships between the axial, radial and tangential cutting forces and the effect of the combined force thereof are determined in order to ensure the necessary surface pressure. During the analysis geometric and mathematical relationships were obtained. The extracted analytical expressions can be realized by further experimental researches and can be used in engineering calculations of technological parameters of processing by lapping. Angular velocity, friction force, linear velocity, also the length of the tactile curve and the radius of the part can be considered the main kinematic and dynamic parameters of the process that the formation of the surface, also the course of the process depends on these parameters. Depending on the kinematic parameters, the wear nature of the tool changes and this changes the linear and angular velocities, which have a significant impact on the accuracy, quality and productivity of processing. When examining the technological capabilities of the process, the nature of the movement between the part and the grinding tool, also changes in cutting speed are often considered as a main factor. Analytical expressions were obtained to determine the main parameters of the process, taking into account the kinematic characteristics of the friction process. These expressions can be used in engineering calculations and allow to determine the optimal values of the processing mode. In order to obtain the required micrometric surface cleanliness and measurement accuracy, correlation relationships were established between the main parameters of the process, equations of the equilibrium system of shear forces were compiled and analytical expressions were obtained based on the analysis of kinematic and dynamic properties of the system.

scholarly journals Biomechanical substantiation of the technique of hanging in rock climbing

2019 ◽  
Vol 5 (1) ◽  
pp. 25
Author(s):  
S.V. Kozin
Keyword(s):  
Lumbar Spine ◽  
Shoulder Joint ◽  
Kinematic Chain ◽  
Vertical Axis ◽  
Shoulder Girdle ◽  
Rock Climbing ◽  
Kinematic Parameters ◽  
Theoretical Justification ◽  
Kinematic Characteristics ◽  
Correct Technique

<p><em>The purpose</em> of the work is to identify the main kinematic characteristics of a hanging in rock climbing by athletes of different qualifications and theoretically substantiate the correct technique for performing of a given movement. <em>Material and methods.</em> The technique of hanging performance in bouldering of 20 leading climbers of the World and Ukraine and 20 beginner male amateur climbers was analyzed. The age of athletes was 22.4 ± 3.2 years, body length 178.5 ± 12.5 cm, body weight 72.2 ± 8.5 kg. A qualified athlete took part in a demonstration of various models for performing a hang. Using the Kinovea 0.8.15 computer program, the kinematic characteristics of the two models of technology were analyzed (model 1 — typical for novice athletes, model 2 — typical of qualified athletes) based on determining the angle between the shoulder and shoulder girdle, as well as between the lumbar spine and vertical axis. Results. The main kinematic parameters of vibration in climbing for various models of equipment, characteristic of athletes of different qualifications, are revealed. The presence of significant differences (p &lt;0.001) in the angles between the shoulder and the upper arm, between the lower spine and the vertical axis in the fixation phase of the vis is shown. The angle between the shoulder and shoulder girdle in the first model of technology was 1460, in the second model of technology this angle is 970. The angle between the lumbar spine and the vertical axis was 110 in the first model, in the second model this angle was 280. A theoretical justification of the correct hanging technique climbing in terms of the laws of mechanics and the laws of the interaction of forces in the kinematic chain. Findings. In the first model, vis is carried out mainly due to the ligamentous apparatus of the joints of the shoulder girdle with minimal inclusion of muscles, which is dangerous by injury to the ligaments of the shoulder joint. In the second model, VIS also provides for the inclusion of the muscles of the trunk and legs, which reduces the load on the ligamentous apparatus and reduces the chance of injury to the ligaments of the shoulder joint.</p>

scholarly journals DETERMINATION OF THE MAIN PARAMETERS OF THE ROTARY MOWER CUTTING APPARATUS

2020 ◽  
pp. 77-85
Author(s):  
Dmitry Kondratyuk ◽  
Vitaliy Komaha
Keyword(s):  
Cutting Speed ◽  
Soil Surface ◽  
Angular Speed ◽  
Working Length ◽  
Mode Of Operation ◽  
Basic Parameters ◽  
Rotary Cutting ◽  
The Difference ◽  
Translational Speed

For mowing grass during harvesting of hay or haylage, support-free mowers with rotary movement of knives are used mainly, the productivity of which is much greater than segment-finger mowers. Free-cutting cutting apparatuses with rotational movement of knives happen with their rotation around the vertical (rotary) and horizontal (rotary) axes. Mowers that are equipped with rotary cutting devices significantly grind grass, so they are used in mower-grinders and lawn mowers. The purpose of the work is to substantiate the methodology for calculating the structural and kinematic parameters of rotary cutting devices, corresponding to the conditions of their use. The main parameters characterizing the operation of rotary cutting devices are: area, mows than in one revolution of the disk; knife working length; overlapping knives of adjacent rotors; cutting speed. In determining the basic parameters of the rotary cutting apparatus of the mower, the following assumptions were made. It was believed that the angular speed of the rotor and the translational speed of the mower are unchanged, and the movement of the unit is straightforward. In addition, the cutting apparatus performs mowing in a plane parallel to the soil surface, that is, in a plane perpendicular to most plant stems. It is shown that the absolute speed of any point of the knife varies from the maximum value equal to the sum of the peripheral speed of this point and the aggregation speed of the mower, to the minimum - the difference of the above speeds. It was found that the working length of the cutting edge of the knife is directly proportional to the speed of aggregation of the mower and inversely proportional to the angular velocity of the rotor and the number of knives mounted on it. The overlap of the path of the knives of adjacent rotors depends on the radius of the rotor; the number of knives mounted on it and the kinematic mode of operation of the cutting apparatus. Moreover, an increase in the radius of the rotor requires an increase in overlap, and an increase in the kinematic mode and the number of knives leads to a decrease in the overlap between the paths of the knives. The resulting dependence, which allows you to determine the area, mows than in one revolution of the rotor.

scholarly journals Organizational and technological parameters of facade works and influencing factors

2021 ◽  
Vol 263 ◽  
pp. 04054
Author(s):  
Mukhammet Fakhratov ◽  
Ibrahim Fadhil
Keyword(s):  
Construction Management ◽  
Point Of View ◽  
Design Stage ◽  
Technological Changes ◽  
Construction Work ◽  
Technological Parameters ◽  
Different Dimensions ◽  
Technical And Economic Indicators ◽  
Selection Of ◽  
Construction Works

The article deals with the organizational and technological features of construction. The organization of construction production for the installation of facade systems with an air gap during the construction of buildings is associated with coordination with general construction works. Often, construction management projects developed at the design stage are adjusted taking into account the current conditions. These changes can occur both before the start of work and during the production of work. The introduction of organizational and technological changes in the production process of work can lead to a significant decrease in technical and economic indicators. In this regard, it is relevant to resolve the issues of assessment and selection of effective organizational and technological solutions for the device of facade systems. The difficulty is the assessment of factors with different dimensions of quantitative and qualitative indicators. Installation of facade systems is a work performed in the open air, in connection with which there are factors that have a rather strong influence on the complexity of the work. In addition, as with any other construction work, it depends on the completion of other construction work. Another important feature of the organization of facade work is the orientation of the work front in the unfamiliar plane of the building. The study of this type of work is relevant and is of interest from a scientific point of view, not only in matters of constructive solutions for and organization of work and the use of appropriate machines and mechanisms. A well-grounded choice of technological equipment and the number and qualification of workers will increase the performance of work.

scholarly journals Determination of the installation parameters for additional attachments on the plowing unit for soil tillage

2021 ◽  
Author(s):  
V. Chebotarev ◽  
◽  
I. Kruk ◽  
F. Nazarov ◽  
Y. Chigariev ◽  
...  
Keyword(s):  
Power Consumption ◽  
Experimental Studies ◽  
Soil Surface ◽  
Soil Tillage ◽  
Kinematic Parameters ◽  
Technological Parameters ◽  
Soil Particles ◽  
Soil Movement ◽  
Working Surface

Summary. This article is dedicated to the subject of designing additional tools for use with reversible ploughs that cuts and loosens topsoil. The aim is to reduce power consumption spent for soil tillage by using reversible ploughs with roller cultivators. Methods. Theoretical and experimental studies of the topsoil movement on the plough’s wing, the mouldboard and beyond. Results. Analysis of the movement of soil particles falling from the top edge of the plough’s moulboard has allowed to obtain analytical dependence for determining the size range of soil particles based on the geometry of the working surface of the plough’s body (distance from the soil surface to the top edge of the mouldboard, the angles of the edge of the mouldboard) and the kinematic parameters of the soil (speed of the plough and roller cultivator, soil particles speed on the edge of mouldboard, soil particles descent time). A research, on the movement of the soil particles, on the mouldboard surface of the plough's body is presented. The section through the mouldboard perpendicular to the wing of the plough is described by the equation of the "inverted" cycloid and based on it the dependences have been obtained to determine the kinematic parameters of the movement of the soil particles on the surface of the plough’s body, depending on the mouldboard type and properties of the soil. Results obtained in this article allow to design the roller cultivators for reversible ploughs with determined parameters of installation, in which the power consumption costs of the plowing process will be minimal. Conclusions. Obtained analytical dependences, that determine kinematic and technological parameters of the soil movement on the working surface of the plow, the section through the orthogonal wing that has the form of an "inverted"cycloid, the variable design and technological parameters of the plough and the conditions of its operation, allowing to justify the installation parameters of the roller cultivator relative to the plough, taking into account the proposed correction ratio, which depends on the mechanical properties of the soil and its structure.

scholarly journals Analysis of the geometry and contact density of globoid gearing

2020 ◽  
Vol 329 ◽  
pp. 03008
Author(s):  
Aleksandr Vyatkin
Keyword(s):  
Numerical Methods ◽  
Load Capacity ◽  
High Load ◽  
Design Stage ◽  
Energy Losses ◽  
Technological Parameters ◽  
Contact Density ◽  
Small Energy ◽  
Worm Gears ◽  
High Load Capacity

Globoid worm gears have been widely applied in a range of technological branches in which other types of worm gears are less effective. The main functional indicators which facilitated their popularity include high load capacity and durability, low vibroactivity and small energy losses. As the experience of application and the results of the study of globoid worm gears showed, the level of operational properties of globoid gears is higher than that of the others only if the gearing and technological parameters of their manufacturing are optimally chosen during the design stage. This paper describes a method for estimating the gearing parameters of a globoid gear with an account of the geometry of the elements (the geometry of the teeth of the wheel and the worm thread), namely the calculation of the gap fields in the globoid gearing by means of numerical methods.

scholarly journals System analysis of friction and wear processes when using fullerene compositions in lubricants

2021 ◽  
Vol 101 (3) ◽  
pp. 15-25
Author(s):  
A. Kravtsov ◽  
Keyword(s):  
Mathematical Models ◽  
Friction And Wear ◽  
System Analysis ◽  
Contact Problems ◽  
Correct Choice ◽  
Design Parameters ◽  
Technological Parameters ◽  
Surface Layers ◽  
Multi Scale ◽  
The Coefficient Of Friction

The system-structural approach in researches of processes of friction and wear at application of fullerene compositions in lubricants is proved in the work. It is proposed to use a multilevel approach to study and model the processes of deformation of the surface layers of movable and fixed triboelements and the formation on energy-activated surfaces of wear-resistant structures containing fullerene molecules. The essence of the approach is to use multi-scale research methods to build mathematical models within a single research structure. Due to the fact that tribosystems differ in the integrity of the interconnected elements included in them, it is assumed that all processes occur at three hierarchical levels. At this level, they interact with each other and exchange energy and matter. Input and output flows in studies of tribosystems are formulated. It is shown that the input streams include design parameters of the tribosystem, technological parameters, operating parameters. These parameters form the flow of matter, energy and information, which is the input effect on the tribosystem. The output flow from the tribosystem are the parameters: volumetric wear rate I, dimension m3/hour; friction losses, which are estimated by the coefficient of friction f, dimensionless quantity. The output stream is the information flow of the tribosystem. When solving contact problems, this allows to take into account not only the level of stresses, but also the speed of deformation in the materials of the surface layers, as well as the depth of deformation, which in the models will take into account the volume of deformed material.Depending on the tasks and requirements for their solution, the use of different methodological approaches for modeling is justified. It is shown that the application of mathematical models in the modeling of tribological processes depends on the correct choice of technical constraints that determine the range of optimal solutions

A Multidimensional Extension of Balje Chart for Axial Flow Turbomachinery Using Artificial Intelligence-Based Meta-Models

2019 ◽  
Vol 141 (11) ◽  
Author(s):  
Gino Angelini ◽  
Alessandro Corsini ◽  
Giovanni Delibra ◽  
Lorenzo Tieghi
Keyword(s):  
Axial Flow ◽  
Principal Component ◽  
Correct Choice ◽  
Machine Learning Techniques ◽  
Operational Parameters ◽  
Kinematic Parameters ◽  
Fan Performance ◽  
Learning Techniques ◽  
Optimal Values ◽  
Specific Speed

Abstract The main intent of this work is the exploration of the rotor-only fan design space to identify the correlations between fan performance and enriched geometric and kinematic parameters. In particular, the aim is to derive a multidimensional “Balje chart,” where the main geometric and operational parameters are taken into account in addition to the specific speed and diameter, to guide a fan designer toward the correct choice of parameters such as hub solidity, blade number, hub-to-tip ratio (HR). This multidimensional chart was built using performance data derived from a quasi-3D in-house software for axisymmetric blade analysis and then explored by means of machine learning techniques suitable for big data analysis. Principal component analysis (PCA) and projection to latent structure (PLS) allowed finding optimal values of the main geometric parameters required by each specific speed/specific diameter pair.

EVALUATION OF TECHNOLOGICAL PARAMETERS OF ASPHALT CONCRETE MIXTURES FOR THE STREET-ROAD NETWORK IN URBAN AGGROMERATIONS USING ADDITIVES OF POLYETHYLENE WITH LOW MOLECULAR WEIGHT

2021 ◽  
pp. 85-96
Author(s):  
Александр Борисович Соломенцев ◽  
Моиз Режист ◽  
Швендески Маселюс Жозеф
Keyword(s):  
Molecular Weight ◽  
Structure Formation ◽  
Dynamic Viscosity ◽  
Asphalt Concrete ◽  
Road Network ◽  
Low Molecular Weight ◽  
Polymer Additives ◽  
Polymer Additive ◽  
Technological Parameters ◽  
Concrete Mixtures

Получены значения динамической вязкости битумного вяжущего с добавками низкомолекулярного полиэтилена в температурном интервале 60…160 °С. При введении полимерных добавок в дорожный битум вязкость битума повышается. Наиболее высокие значения динамической вязкости наблюдаются у полимерной добавки Вискодор - ПВ1, это ярко выражено при расходе 4 % добавки от массы битума и при температурах ниже 130°С. Добавка неокисленного низкомолекулярного полиэтилена Honeyvell Titan 7205 увеличивает вязкость в большей степени, чем добавка окисленного полиэтилена Honeyvell Titan 7686. Определены допустимые технологические температуры асфальтобетонных смесей с полимерными добавками на этапах структурообразования асфальтобетона. We obtained the values of the dynamic viscosity of bitumen binder with additives of polyethylene with low molecular weight in the temperature range of 60…160 °C. When polymer additives are introduced into road bitumen, the viscosity of bitumen increases. The highest values of dynamic viscosity are observed for the polymer additive Viskodor - PV1, this is clearly pronounced at the consumption of 4 % of the additive based on the mass of bitumen and at temperatures below 130 °С. The additive of unoxidized low molecular weight polyethylene Honeyvell Titan 7205 increases the viscosity to a greater extent than the additive of oxidized polyethylene Honeyvell Titan 7686. We determined as well the permissible technological temperatures of asphalt concrete mixtures with polymer additives at the stages of structure formation of asphalt concrete.

Sign in / Sign up

Export Citation Format

Share Document