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.

Experimental Study on Permanent Deformation of Fine Sandy Subgrade Filling in Coastal Region

2019 ◽  
Vol 814 ◽  
pp. 419-424
Author(s):  
Ding Zhou
Keyword(s):  
Water Content ◽  
Permanent Deformation ◽  
Coastal Region ◽  
Fine Sand ◽  
Test Method ◽  
Factors Affecting ◽  
Permanent Strain ◽  
Shaped Particle ◽  
Repeated Load ◽  
Performance Analyze

By using repeated load triaxial test method, test results of permanent strain of fine sand were obtained. The main factors affecting permanent strain of fine sand samples are water content, degree of compaction and deviator stress. Permanent strain of sand is less sensitive to moisture when compared to clay and silt. Well compacted fine sand subgrade is less affected by the change of water content, which illustrates a more stable long-term performance. Analyze from meso-structure, the ellipsoid shaped particle is less stable than sphere shaped one under the effect to repeated load. Fine sand with smaller amount of ellipsoid shaped particle would have better dynamic behaviors. Predicting models of permanent strain with basic soil physical properties were established using regression analysis.

scholarly journals Factors affecting the functional length of productive life in Slovak Pinzgau cows

2008 ◽  
Vol 53 (No. 3) ◽  
pp. 91-97 ◽  
Author(s):  
G. Mészáros ◽  
J. Wolf ◽  
O. Kadlečík
Keyword(s):  
Milk Production ◽  
Linear Increase ◽  
Production Level ◽  
Proportional Hazard ◽  
Proportional Hazard Model ◽  
Age At First Calving ◽  
Factors Affecting ◽  
Productive Life ◽  
The Impact ◽  
Effect Of Age

A proportional hazard model was used to analyze the impact of the most important factors on the length of productive life in 44 796 Slovak Pinzgau cows. The calculations were carried out with Survival Kit 3.12. The milk production level within a herd was the most important factor. The relation between the milk production level and the culling risk was strongly non-linear. Cows with extremely low milk production (less than 1.5 standard deviations below average) had a 4.8 times higher culling risk than average cows. The culling risk for the highest yielding cows was about one half of the risk of average cows. In the first lactation the culling risk was highest at the beginning and decreased in the course of lactation whereas in subsequent lactations the culling risk was highest at the end of lactation. The risk decreased with parity. The effect of age at first calving did not have a large influence on the length of productive life, although a linear increase in culling risk was observed as the age at first calving increased. Cows from expanding herds were at lower risk to be culled compared to cows in herds of stable and decreasing size.

scholarly journals Surface preparation as one of the main factors for ensuring the durability of anti-corrosion coatings

2020 ◽  
Vol 7 (2) ◽  
Author(s):  
Aleksei Bezgodov ◽  
Ilya Ovchinnikov
Keyword(s):  
Surface Treatment ◽  
Protective Coatings ◽  
Surface Preparation ◽  
Negative Consequences ◽  
Treatment Methods ◽  
Factors Affecting ◽  
Metal Structures ◽  
Optimal Processing ◽  
Main Factors ◽  
Paint Coatings

This article is devoted to the protection of bridge metal structures from corrosion. The article was written with the aim of studying one of the stages of anti-corrosion treatment, namely the preparation of the surface before applying a protective coating. In the article, the authors address the problem of the durability of paint coatings, and point to the main reasons, to a greater extent, affecting the service life. Studying the problem of the durability of protective coatings, the authors distinguish such a stage as preparing the metal surface of the bridge structure before applying the paintwork. The authors tell how important the preparation of the surface is and what negative consequences are possible if it is disturbed or not. For a more detailed study of the problem, the authors consider several methods of preparing the surface of the structure, such as: abrasive blast cleaning, phosphating the surface and heat treatment. When studying the above mentioned methods, the authors describe the technology of the work, the main factors affecting the final result of processing, as well as the positive and negative sides of each of the methods. For each of the surface treatment methods, the authors present illustrations that clearly show the basic concept of the selected treatment option. Summing up the comparative analysis of surface treatment methods before applying anti-corrosion coatings, the authors chose the most optimal processing method, as well as concluded that the importance of this stage and the possibility of its further improvement.

scholarly journals DESIGNING OF METHODS FOR OPTIMIZING THE RESTORATION OF BRIDGES

2020 ◽  
pp. 140-149
Author(s):  
A.I. Meneylyuk ◽  
◽  
S.V. Putilin ◽  
Keyword(s):  
Numerical Experiment ◽  
Performance Indicators ◽  
Multicriteria Analysis ◽  
Working Time ◽  
Factor Space ◽  
Factors Affecting ◽  
Experimental Planning ◽  
Urgent Task ◽  
The Cost ◽  
Factors Affecting Performance

Abstract. The biggest part of the bridges in Ukraine requires serious restoration works. However, in the literature sources there are no recommendations for choosing effective organizational and technological solutions for the reconstruction of bridges and overpasses. Therefore, the design of methods for optimizing bridge restoration is an urgent task. The working optimization hypothesis is formulated in the article. A general research technique is developed. The algorithm of multicriteria analysis is presented to determine the most effective structural and technological solutions for the restoration of the main structural elements of the studied structures. As a result of the analysis, the most significant indicators of restoration efficiency were determined. These were the cost of restoration of m2 of the bridge and the duration of restoration of the bridge. As factors affecting performance indicators ‒ the intensity of the use of working time and the combination of construction processes, the size of the roadway and the operational condition of the bridge were selected. The planning of the experiment is based on the well-known theory of experimental planning. A 25-point D-optimal plan was selected, which will provide adequate results with significantly fewer experiments than in a full-factor experiment. For calculations is used the program software COMPEX, which is developed at the Odessa State Academy of Civil Engineering and Architecture under the direction of Professor V. Voznesensky. Modelling allows to find the dependencies between the input (intensity use of working time, combination of construction processes, size of the carriageway of the bridge, operational condition of the bridge) and output (cost of restoration of m2 of the bridge, duration of restoration of the bridge) parameters. Dependences data is described with usage of second-degree polynomials obtained by processing the results of a numerical experiment. These dependencies will allow to determine the cost and duration of the restoration of the bridge for varying degrees of damage and the size of the bridge. In addition, to change indicators by choosing the optimal production modes (combination of processes, the intensity of the use of working time). The analysis of the results of a numerical experiment will allow us to assess the influence of organizational and technological factors on the performance indicators of restoration technologies and find areas of factor space that provide optimization of organizational and technological solutions for the restoration of damaged bridges. At the last stage of the numerical experiment, limits are introduced into graphic models (by cost, duration, combination, etc.) and the optimal organizational and technological solutions are determined taking into account the introduced restrictions.

scholarly journals Integrated Research of Professional Voice Disorders of Humanitarian Departments’ Teachers

2019 ◽  
Vol 11 (1) ◽  
pp. 151
Author(s):  
Liudmyla Peretyaha ◽  
Valentyna Grineva ◽  
Iryna Shulga ◽  
Valentina Kuzmichyova ◽  
Maryna Shlenova ◽  
...  
Keyword(s):  
Voice Disorders ◽  
Health Condition ◽  
Negative Consequences ◽  
It Use ◽  
Factors Affecting ◽  
Maximum Phonation Time ◽  
Integrated Research ◽  
The Status ◽  
The Voice ◽  
Professional Voice

Purpose: To determine the main voice disorders of humanitarian departments’ teachers, their reasons and effective methods to keep the voice in a health condition. Material: In the research participated 142 teachers of H. S. Skovoroda Kharkiv National Pedagogical University and National Aerospace University – "Kharkiv Aviation Institute" (n=106 women, n=36 men). The study involved auditory assessment of teachers' voice and questionnaire in order to determine teachers’ professional voice problems and factors influenced on the status and quality of the voice. Results: It was determine the maximum phonation time for participants of genders, the voice disorders frequency, typical problems with teachers' voice, the positive and negative factors affecting the voice system condition. Also participants answered the questionnaire’s questions about voice using. Conclusions: the study showed that teachers take their voice for granted and do not always care about it; use their voice in an unhealthy condition and they are not always aware of the negative consequences for their health.

scholarly journals Ground of the modes of agglutination of aspen lead of

2017 ◽  
Author(s):  
А.Н. Чубинский ◽  
И.В. Коваленко ◽  
Д.С. Русаков ◽  
Г.С. Варанкина
Keyword(s):  
Compaction Pressure ◽  
Permanent Deformation ◽  
Economic Conditions ◽  
Structure And Properties ◽  
Aspen Wood ◽  
Lower Strength ◽  
Urgent Task ◽  
Corrosion Susceptibility ◽  
Flow Pressure

Качество формирования клеевых соединений древесины при склеивании шпона зависит от многих факторов, основными из которых являются плотность и влажность древесины, ее поверхностные свойства, вид клея и его характеристики, режимы склеивания. Фанера, склеенная из осинового шпона по применяемым на практике режимам, характеризуется меньшей прочностью, по сравнению с березовой фанерой. Применение древесины осины в промышленном производстве материалов и изделий ограничено из-за ее низких механических свойств, подверженности поражению коррозионно-деструктивной гнили, отсутствия должного обоснования технологии ее переработки. Невостребованная осина осложняет условия хозяйствования в лесу, ухудшает породный состав древостоев, препятствует восстановлению хвойных пород древесины. Прочность склеивания древесины и прочность фанеры возрастает с увеличением давления прессования, однако приводит к увеличению остаточной деформации и вероятности возникновения «пузырей» в склеиваемом пакете шпона. Поэтому обоснование давление прессования и расхода клея для склеивания шпона на основе свойств и строения древесины осины является актуальной задачей. Снижение давления по закону релаксирующих напряжений позволяет уменьшить давление парогазовой смеси в пакете шпона, уменьшает вероятность разрушения клеевого соединения при снятии внешнего усилия. Одним из эффективных способов повышения прочности клеевого соединения является применение лигносульфонатов в качестве модификатора для синтетических смол. The quality of the formation of adhesive joints when gluing wood veneers depends on many factors, the main ones are the density and moisture content of wood, its surface properties, type of adhesive and its characteristics, bonding modes. Plywood glued veneers of aspen on applied practice modes, characterized by lower strength in comparison with birch plywood. The use of aspen wood in manufacturing of materials and products is limited due to its low mechanical properties, corrosion susceptibility destructive lesion decay, its lack of proper justification processing technology. Unclaimed aspen difficult economic conditions in the forest, degrades the species composition of forest stands and prevents restoration of softwood. The adhesion of wood and plywood strength increases with increasing compaction pressure, however, leads to an increase in permanent deformation, and the likelihood of «bubbles» in the package are glued veneer. That is why the support of the pressing and glue flow pressure for bonding the veneer on the basis of structure and properties of aspen wood is an urgent task. Reducing pressure legally relaxing stress to reduce the pressure of the gas mixture in the veneer package, reduces the probability of failure of the adhesive joint when removing the external force. One effective way of increasing the bonding strength is the use of lignosulfonate as a modifier for synthetic resins.

scholarly journals Evaluation of methods for experimental and analytical determination of the contour area of the contact patch of a pneumatic tire with a support base

2021 ◽  
Vol 1 (1) ◽  
pp. 40-50
Author(s):  
A.V. Lipkan' ◽  
◽  
A.N. Panasyuk ◽  
Z.A. Godzhayev ◽  
A.V. Lavrov ◽  
...  
Keyword(s):  
Field Work ◽  
Computational Method ◽  
Analytical Determination ◽  
Engineering Practice ◽  
Tire Pressure ◽  
Method Error ◽  
Digital Photograph ◽  
Contact Patch ◽  
Pneumatic Wheel

Subject of study. The results of experiments on the estimation of the error of methods of experi-mental and calculated determination of the contour area for the ecological assessment of a mobile energy device (MED) are presented. There was used the example of modern radial tires 360 / 70R24 of Bel-89 and 18.4R34 of F-11 agricultural tractor MTZ-1025.2. in modes of non-nominal loading at nominal load on tires and changes in tire pressure within the range recommended for field work. The purpose of the study. To assess the possibility of improving the computational method for determining the contour area of the contact patch of the tire tread of a pneumatic wheel based on the mathematical model of V.L. Biederman. Materials and methods. The assessment was carried out for four ways of determining the area of the tire contact patch: 1) directly measuring the area using a digital photograph of the tire contact patch in Kompas-3D V13 software with the de-termination of the scaling and method error using a square from 100x100 mm graph paper; 2) calcu-lation by the formula of the area of an ellipse, using the length and width of the tire contact patch, measured with a tape measure directly from the obtained print; 3) by calculation, determined from the digital photograph in Kompas-3D V13 software; 4) by calculation, determined by calculation using the parameters of the universal tire characteristic (UTC). Results and discussion. As a result of the experiments, it was found that for modern radial tractor tires, the static deformation of which does not exceed 18-22%, the method of theoretical determination of the contour area of the tire contact patch using the UTC parameters can be applied with sufficient (for engineering practice) accuracy. Full convergence of the calculated and experimental contour areas of the tire contact patch can be provided by the coefficient of their ratio. Conclusions. The carried out assessment of the possibility of using methods for calculating the conditional contour area of the tire showed that these methods can be well used for a comparative assessment of the technogenic mechanical impact of propellers on the soil.

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