scholarly journals Theoretical Study of Vibrocentrifugal Separation of Grain Mixtures on a Sieveless Seed-cleaning Machine

2021 ◽  
Vol 46 (341) ◽  
pp. 116-124
Author(s):  
Valerii Adamchuk ◽  
Volodymyr Bulgakov ◽  
Iaroslav Gadzalo ◽  
Semjons Ivanovs ◽  
Serhiy Stepanenko ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Free Surface ◽  
Theoretical Study ◽  
Physical And Mechanical Properties ◽  
Mode I ◽  
Theoretical Studies ◽  
Aerodynamic Properties ◽  
Air Stream ◽  
Cleaning Machine ◽  
Seed Mixture

Abstract The article presents an analysis of known developments on creation of sieve-less pneumatic vibration centrifuges separating devices and processes of separating seed mixtures into fractions according to the complex of physical and mechanical properties of components. Mechanistic and mathematical models for studying the movement of particles over the sieve-free surface of pneumatic vibration separators were developed, theoretical studies of movement of seed mixture components were conducted and the most acceptable pneumatic vibration centrifugation process was determined by likeness to the process occurring on the separating surface of pneumatic sorting tables. To achieve the greatest separation of particles on the complex of their physical and mechanical properties (density, geometric dimensions, aerodynamic properties of seeds) is possible with the same direction of oscillatory motion and rotation of the separating surface performing the rotation in the direction from a larger radius to a smaller radius of the surface, in the “fluidization” mode, i. e. i.e. with periodic separation of the lower particles of the layer from the separating surface at simultaneous blowing of the layer by an air stream.

scholarly journals An evaluation of the physical, dynamic and aerodynamic properties of olives

2019 ◽  
Vol 65 (No. 2) ◽  
pp. 48-55
Author(s):  
Abbas Akbarnia ◽  
Mahdi Rashvand
Keyword(s):  
Mechanical Properties ◽  
Physical And Mechanical Properties ◽  
Agricultural Products ◽  
Test Material ◽  
Mechanical Sensitivity ◽  
Aerodynamic Properties ◽  
Sphericity Index ◽  
The Mean ◽  
Power And Energy

The determination of the physical and mechanical properties of agricultural products has always been considered as the basis for the design and fabrication of transmission, grading, and processing equipment for agricultural products. Due to the increasing production of olives and the foreign exchange earnings from its trade, the mechanisation of harvesting and processing operations is inevitable. Therefore, the aim of this study was to evaluate the physical, dynamic and aerodynamic properties of olive species in order to design and fabricate an olive oiling machine. In this research, four species of olives, namely the Manzanilla, Kalamata, Fishemi, and Oily, were used. The physical properties of the samples were completely different. The mean dimensions of the Manzanilla species are the largest and the Oily is smallest and were the inverse in relation to the sphericity index. To determine the mechanical properties of the samples, the test material was used at a speed of 8 mm·min–1. The results showed that the maximum and minimum power and energy of rupture were allocated to the Manzanilla and Oily species, respectively. The Oily samples have the most mechanical sensitivity when compared to the other samples. The aerodynamic properties of the olive species were measured using a wind tunnel. The highest velocity and drag coefficient were assigned to the Oily sample and the lowest values were assigned to the Kalamata sample.

scholarly journals Traction resistance of the combined machine plough

2021 ◽  
Vol 264 ◽  
pp. 04036
Author(s):  
Dustmurod Chuyanov ◽  
Golib Shodmonov ◽  
Ibrat Ismailov ◽  
Gayrat Ergashov ◽  
Akramjon Sadikov
Keyword(s):  
Mechanical Properties ◽  
Physical And Mechanical Properties ◽  
Design Parameters ◽  
Theoretical Studies ◽  
Drill Bit ◽  
Technological Parameters ◽  
Analytical Expression ◽  
Soil Cultivation ◽  
Agricultural Mechanics ◽  
Theoretical Mechanics

Subsoils are widely used on tillage and combination machines. The tiller of the combined machine for preparing the soil for sowing melons and gourds carries out strip loosening of the subsoil layers. The study aims to theoretically determine the traction resistance of a soil deepener of a combined machine for preparing the soil for sowing melons and gourds. The study uses the basic provisions of mathematics, theoretical mechanics, and agricultural mechanics. In studies, it is assumed that the destruction of the soil under the influence of the drill bit occurs by separation. The total traction resistance of the subsoiler was determined as the sum of the resistance of the rack and the bit. An analytical expression has been obtained to determine the traction resistance of a tilting machine with an inclined stand, depending on its design, technological parameters, and the physical and mechanical properties of the soil. As a result of theoretical studies, it was found that the traction resistance of the soil deepener is mainly influenced by its design parameters, the depth of soil cultivation, the physical and mechanical properties of the soil, and the speed of the machine.

scholarly journals Theoretical study of interaction process of cutter for milling working equipment of excavator with soil

2021 ◽  
Vol 18 (1) ◽  
pp. 42-50
Author(s):  
I. S. Kuznetsov
Keyword(s):  
Theoretical Study ◽  
Physical And Mechanical Properties ◽  
Interaction Process ◽  
Pipeline System ◽  
Theoretical Studies ◽  
Pipeline Transport ◽  
Repair Work ◽  
Emergency Situations ◽  
The Russian Federation ◽  
The Moment

Introduction. The pipeline transport of the Russian Federation makes up a significant share in the economy of our country. However, the service life of many pipelines at the moment is several decades. In this regard, the number of emergency situations is increasing. Moreover, the degree of their impact on infrastructure and the environment is increasing from year to year. It is important to solve the problem of timely repair of the pipeline system using modern and effective methods. The use of mechanization means can significantly reduce the time of repair work and their cost.Materials and methods. As a result of the research, a mathematical model of the interaction of the cutter of the milling working equipment of a hydraulic excavator with the excavated soil has been developed. It takes into account the physical and mechanical properties of the soil and the speed of penetration of the cutter at the point of contact with the soil.Results. The dependence is obtained, which allows determining the force of penetration of the cutter of the milling working equipment into the soil.Discussion and conclusions. It is recommended to use the results of the performed theoretical studies for calculating the design and operating parameters in the design and creation of milling working equipment.

scholarly journals Theoretical and experimental study of the effect of wollastonite on the physical and mechanical properties of concrete

2021 ◽  
Vol 2094 (2) ◽  
pp. 022077
Author(s):  
S S Dobrosmyslov ◽  
A S Voronin ◽  
Y V Fadeev ◽  
I G Endzhievskaya ◽  
S V Khartov
Keyword(s):  
Mechanical Properties ◽  
Experimental Study ◽  
Specific Volume ◽  
Mechanical Characteristics ◽  
Bending Strength ◽  
Theoretical Study ◽  
Chemical Interaction ◽  
Physical And Mechanical Properties ◽  
Internal Stresses ◽  
Physical And Mechanical Characteristics

Abstract As part of the work, an experimental and theoretical study of the effect of adding wollastonite on the physical and mechanical characteristics of concrete was carried out. The internal stress was calculated according to Hooke’s law. The change in the specific volume was determined from the change in the volume of the hydrated phase. The calculation of the chemical interaction was carried out within the framework of thermodynamic equilibrium. According to the results of the work, it was shown that the addition of wollastonite leads to a linear decrease in the value of internal stresses, which is consistent with experimental results on the increase in compressive and bending strength.

PEMANFAATAN KAYU AKASIA MANGIUM (Acacia mangium Willd) UNTUK MEBEL

2012 ◽  
Vol 4 (1) ◽  
pp. 1
Author(s):  
Djoko Purwanto
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Physical Properties ◽  
Treatment Process ◽  
Acacia Mangium ◽  
Physical And Mechanical Properties ◽  
Wood Fibers ◽  
Test Parameters ◽  
Mechanical And Physical Properties ◽  
Scale Scores

Timber Acacia mangium (Acacia mangium, Willd) for Furniture. The study aims to determine the mechanical and physical properties and the decorative value (color and fiber) wood of acacia mangium with using finishing materials. This type of finishing material used is ultran lasur natural dof ,ultran lasur classic teak, aqua politur clear dof, aqua politur akasia dan aqua politur cherry. After finishing the wood is stored for 3 months. Test parameters were observed, namely, physical and mechanical properties of wood, adhesion of finishing materials, color and appearance of the fiber, and timber dimensions expansion. The results showed that the mechanical physical properties of acacia wood qualified SNI. 01-0608-89 about the physical and mechanical properties of wood for furniture, air dry the moisture content from 13.78 to 14.89%, flexural strength from 509.25 to 680.50 kg/cm2, and compressive strength parallel to fiber 342.1 - 412.9 kg/cm2. Finishing the treatment process using five types of finishing materials can increase the decorative value (color and fiber) wood. Before finishing the process of acacia mangium wood has the appearance of colors and fibers and less attractive (scale scores 2-3), after finishing acacia wood fibers have the appearance of colors and interesting and very interesting (scale 4-5).Keywords: mangium wood, mechanical properties, decorative value, finishing, furniture.

Physical and Mechanical Properties of Tenun Pahang Fabrics using Alternative Yarns

2016 ◽  
Vol 13 (2) ◽  
pp. 67
Author(s):  
Engku Liyana Zafirah Engku Mohd Suhaimi ◽  
Jamil Salleh ◽  
Suzaini Abd Ghani ◽  
Mohamad Faizul Yahya ◽  
Mohd Rozi Ahmad
Keyword(s):  
Mechanical Properties ◽  
Physical And Mechanical Properties ◽  
The Other ◽  
Silk Fabrics ◽  
Recovery Angle ◽  
Made In

An investigation on the properties of Tenun Pahang fabric performances using alternative yarns was conducted. The studies were made in order to evaluate whether the Tenun Pahang fabric could be produced economically and at the same time maintain the fabric quality. Traditional Tenun Pahang fabric uses silk for both warp and weft. For this project, two alternative yarns were used which were bamboo and modal, which were a little lower in cost compared to silk. These yarns were woven with two variations, one with the yarns as weft only while maintaining the silk warp and the other with both warp and weft using the alternative yarns. Four (4) physical testings and three (3) mechanical testings conducted on the fabric samples. The fabric samples were evaluated including weight, thickness, thread density, crease recovery angle, stiffness and drapability. The results show that modal/silk and bamboo silk fabrics are comparable in terms of stiffness and drapability, hence they have the potential to replace 100% silk Tenun Pahang.

Basic set of experiments for determination of mechanical properties of sand

2014 ◽  
Vol 62 (1) ◽  
pp. 129-137
Author(s):  
A. Sawicki ◽  
J. Mierczyński
Keyword(s):  
Mechanical Properties ◽  
Soil Mechanics ◽  
Physical And Mechanical Properties ◽  
Local Strain ◽  
Initial State ◽  
Laboratory Equipment ◽  
Additional Information ◽  
Basic Set ◽  
Initial Anisotropy

Abstract A basic set of experiments for the determination of mechanical properties of sands is described. This includes the determination of basic physical and mechanical properties, as conventionally applied in soil mechanics, as well as some additional experiments, which provide further information on mechanical properties of granular soils. These additional experiments allow for determination of steady state and instability lines, stress-strain relations for isotropic loading and pure shearing, and simple cyclic shearing tests. Unconventional oedometric experiments are also presented. Necessary laboratory equipment is described, which includes a triaxial apparatus equipped with local strain gauges, an oedometer capable of measuring lateral stresses and a simple cyclic shearing apparatus. The above experiments provide additional information on soil’s properties, which is useful in studying the following phenomena: pre-failure deformations of sand including cyclic loading compaction, pore-pressure generation and liquefaction, both static and caused by cyclic loadings, the effect of sand initial anisotropy and various instabilities. An important feature of the experiments described is that they make it possible to determine the initial state of sand, defined as either contractive or dilative. Experimental results for the “Gdynia” model sand are shown.

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