scholarly journals The calculation analysis of the geometric parameters for shock separation during threshing

2019 ◽  
Vol 126 ◽  
pp. 00058
Author(s):  
Elena Fisunova ◽  
Tatyana Lavrenova ◽  
Olga Baryshnikova
Keyword(s):  
Geometric Parameters ◽  
Time Interval ◽  
Working Bodies ◽  
Calculation Analysis

This analysis was made on the basis of the developed methodology for the geometric parameters calculating of the working bodies, which allows changing their sizes. The described algorithm and the programdeveloped on the basis of it made it possible to calculate the position of the grains and the threshingelements depending on time with the ability to change the time interval within certain limits. Find collision parameters for various laws of grain motion and peripheral speeds of the drum, assuming that themass of the threshing element is infinitely large compared to the mass of the grain.

Influence of geometric parameters of screw nozzles of twin-screw extruder-press on oil yield

2021 ◽  
Vol 12 (3) ◽  
Author(s):  
M. M. Gudzenko ◽  
◽  
V. P. Vasyliv ◽  
M. M. Mushtruk ◽  
M. M. Zheplinska ◽  
...  
Keyword(s):  
Free Volume ◽  
Geometric Parameters ◽  
Oil Yield ◽  
General Nature ◽  
Geometrical Parameters ◽  
Twin Screw Extruder ◽  
Screw Extruder ◽  
Twin Screw ◽  
Working Bodies ◽  
Selection Of

In modern economic conditions, the chosen technology of raw material processing and the choice of the necessary equipment for both the line as a whole and the oil press are of great importance in oil production. In small-capacity workshops, screw presses of various designs are used. The twin-screw extruder occupied a certain niche among the press equipment with a productivity of 150–500 kg/h. Their use can significantly simplify the technology of oilseed processing. They combine operations of heat treatment, grinding, and pressing of vegetable oil. It is important to study the influence of geometric parameters of the oil pressure path and screw nozzle on the oil yield. In twin-screw extruders, it is rational to choose the pitch of the worm, the width of the channel between the turns, the width of the crest of the turn and the length of the nozzle with variable geometrical parameters. The analysis and selection of geometrical parameters of working bodies of a twin-screw extruder on the basis of theoretical calculations are carried out. Two sets of experimental working bodies with the changed geometrical parameters are made. Their theoretical degree of compression is determined, which is 5.50, 4.69, and 4.33, respectively. It is experimentally confirmed that the oil yield depends on the degree of compression due to the geometric parameters of the screw. The effect of a sharp drop in the free volume of the screw on the energy performance and press extruder performance has been revealed. The general nature of the change in the free volume in the areas of nozzle groups is accompanied by an uneven decrease of 40–80% towards the release of oil cake. The nature of the change in the free volume of turns along the length of the screw shaft characterizes the correctness of its design. The selection of rational geometric parameters of the working bodies should be considered in combination with other design parameters, which will intensify the process of oil pressing.

Investigation of the process of cutting seedling roots when pruning and digging out

10.12737/4529 ◽  
2014 ◽  
Vol 4 (2) ◽  
pp. 216-219 ◽  
Author(s):  
Казаков ◽  
V. Kazakov ◽  
Казаков ◽  
I. Kazakov
Keyword(s):  
Mechanical Strength ◽  
Technological Process ◽  
Geometric Parameters ◽  
Seedling Roots ◽  
Root Cutting ◽  
Working Bodies

The features of the process performed with root cutter and plant lifter, as well as the forces acting on their working bodies are examined. It was established that resistance to the root cutting increases with an increase in their number and diameter, but also depends on their mechanical strength. The studies obtained dependences of forces acting on the working bodies in accordance with their geometric parameters and specific application of technological process that can be used in the development of root cutters and plant lifters.

scholarly journals THE CONTACT INTERACTION DYNAMICS OF THE WORKING TOOL OF THE MOLE PLOWSHARE WITH THE SOIL DURING FORMING PROSESS A CHANNEL FOR AN ANTI-FILTRATION SCREEN

2020 ◽  
pp. 81-89
Author(s):  
Olena Solona ◽  
Vladimir Kovbasa ◽  
Igor Kupchuk
Keyword(s):  
Rigid Body ◽  
Contact Interaction ◽  
Large Scale ◽  
Geometric Parameters ◽  
Theoretical Development ◽  
Maximum Efficiency ◽  
Industrial Complex ◽  
Engineering Structures ◽  
Operating Modes ◽  
Working Bodies

Today's realities of agriculture are increasingly prompting the need for the introduction of technologies for subsoil irrigation, as a possible tool to obtain maximum efficiency indicators of agricultural activities of agricultural enterprises. At the same time, the large-scale introduction of intra-soil irrigation technologies at the enterprises of the agro-industrial complex is significantly complicated due to the poor practical and theoretical development of its methods, as well as the lack of extensive experimental verification of this method of irrigation. The development of many processes in the construction of irrigation and engineering structures requires substantiation of the geometric parameters and operating modes of the working bodies that are used to implement these processes. One of the working bodies that is used to form the cavity along which communication is stretched is a mole plow, which, depending on the expected working conditions, may have a different geometric configuration and size. The results of investigations of the interaction of the mole ploughshare with the soil in cavity formation for laying the anti-filtration screen are describe in this article. The authors propose to consider the soil in the form of an elastic-viscous model. By solving the contact problem of the interaction of a rigid body with a deformed medium, the stress components in the soil on the contact surface with the ploughshare are determined, and soil compaction is determined. The components of forces that appear on the surface of the ploughshare because of its interaction with the soil are determined depending on its geometric parameters and the mechanical properties of the soil. This solution is a general approach for the analytical solution of the class of problems of the contact interaction of a rigid body with a deformable medium possessing the properties of elasticity and viscosity.

EXPERIMENTAL STUDIES OF DETERMINING THE FORCE INFLUENCE OF THE SEPARATING SURFACE OF THE MODULE FOR POST-HARVESTING PROCESSING ROOT CROPS AND ONIONS

2020 ◽  
Keyword(s):  
Experimental Studies ◽  
Time Interval ◽  
Data Logger ◽  
Negative Effects ◽  
Post Harvest ◽  
Root Crops ◽  
Force Impact ◽  
Post Harvesting ◽  
Working Bodies ◽  
The Impact

Despite the availability of extensive research on the mechanized post-harvest processing of root crops and onions, which continues today, there are unresolved problems in this area, which in most cases are associated with the imperfection of the design of separating bodies of post-harvest processing machines. Existing machines cause damage to commercial products as a result of the interaction of root crops and onions with each other, with working bodies and soil lumps. However, the largest percentage of damage is formed as a result of their interaction with the working bodies of the separating machines. The article presents a structural and technological scheme of a module for separation of a pile of root crops and bulbs developed at the VIM Federal Agroengineering Center. In order to determine the place of the greatest force impact and to carry out subsequent measures to eliminate these negative effects in the design of the module under consideration, industrial studies were conducted. A methodology has been developed for conducting industrial studies to as sess the impact of working bodies on the amount of damage to root crops and onions during operation using the «Tuber Log» electronic tuber. The results of studies of module working bodies force impact that affect the damage to marketable products are obtained, processed and graphically presented. The greatest force impact (до 10 Н) on tuber falls on the time interval of values from 4 to 6 s, while the standard deviation and coefficient of variation are σ = 5,52 and ν = 26,9 %, respectively. The most «sparing» force impacts of the working bodies of the machine for separating the data logger at the translational speed of rubberized rollers V0B =0,8 m/s were determined, where the minimum power impact in the range from 2 H to 4 H is created throughout the entire process.

scholarly journals Laboratory studies of the impact of a roller sorting machine on potato tubers

2021 ◽  
Vol 22 (1) ◽  
pp. 119-127
Author(s):  
A. S. Dorokhov ◽  
A. V. Sibirеv ◽  
A. G. Aksenov ◽  
N V. Sazonov
Keyword(s):  
Potato Tuber ◽  
Software Tool ◽  
Time Interval ◽  
Forward Speed ◽  
Laboratory Studies ◽  
Potato Tubers ◽  
Sorting Machine ◽  
Force Impact ◽  
Working Bodies ◽  
The Impact

Existing machines for sorting potatoes damage marketable products as a result of the interaction of potato tubers with each other, with working organs and soil clods. The greatest percentage of damage to potato tubers occurs as a result of their interaction with the working bodies of the machines for sorting. In order to determine the place of the greatest force impact of the working bodies of the sorting machines on the potato tuber and to carry out subsequent measures to eliminate negative effects in the design of these machines, laboratory studies were carried out using the "The TuberLog Electronic Potato" software tool. The article provides the results of comparative studies of the force impact of the sorting surface on the electronic potato tuber at various values of the forward speed of movement and interaction time of the working surface of roller-type machine for sorting potato tubers. Analysis of graphical dependencies showed that the greatest force impact (up to 22 N) on a potato tuber falls on the time interval of values from 8.5 to 9.5 s, while the standard deviation and coefficient of variation are σ = 5.7 and ν = 24.8 %, respectively. The analysis of the experimental data showed that the most "gentle" force impact of the working bodies of the sorting machine at the forward speed of the roller belt of 1.4 m / s throughout the entire technological process of sorting is the minimum force impact on the sorted products in the range from 3 to 6.5 N, which is 28-31% of the maximum force impact of working bodies at speeds of 1.8 and 2.2 m/s.

scholarly journals Parameters of tillage working bodies

2021 ◽  
Vol 284 ◽  
pp. 02012
Author(s):  
Abdulhay Obidov ◽  
Karimjon Nuriev ◽  
Madrahim Allanazarov ◽  
Ermamat Kurbonov ◽  
Rustam Khudoyberdiev
Keyword(s):  
Geometric Parameters ◽  
Analytical Dependence ◽  
Limiting State ◽  
Soil Cutting ◽  
Working Bodies

This article notes that most of the soil-cutting working bodies wear out their socks a lot, as a result of which their limiting state is reached. Despite the fact that other parts of the working body are still workable and the stock of metal for wear is still sufficient, the working body is completely rejected. In this regard, it is emphasized that increasing the durability of the nose parts leads to an increase in the durability of the entire working body. To determine its parameters, the condition for leveling the resources of socks and other parts of the soil-cutting working bodies is considered. When determining the length of the nose of the bits, an analytical dependence is recommended, taking into account the geometric parameters of the bit and the plowshares welded to it. To obtain self-sharpening in the process of bit nose wear, it is recommended to use a new two-faceted profile. The rational values of the length, the angle of the wedge and the sharpening of the nose are determined, equal to 90 mm, 100 and 350-400, respectively. Based on the condition of rational combinations of strength and self-sharpening characteristics of the toes of bits, the thickness and width of the latter were determined, equal to 22.3 mm and 30 mm, respectively.

scholarly journals Technological Capabilities of a Special Strategy for Processing Cycloidal Helical Surfaces with a Non-Profiled Tool

2021 ◽  
Author(s):  
Aleksandr Aleksandrovich Goncharov ◽  
Aleksandr Sergeevich Vasiliev
Keyword(s):  
Geometric Parameters ◽  
Processing Strategy ◽  
Technological Capabilities ◽  
Natural Experiments ◽  
Complex Profile ◽  
Analytical Expression ◽  
Technological Preparation ◽  
Working Bodies ◽  
The Given ◽  
Special Strategy

Abstract The working bodies of screw volumetric machines are complex-profile cycloidal screw surfaces. This article deals with the problem of technological preparation for the production of such surfaces, associated with the uncertainty of the technological capabilities of a special processing strategy. To solve this problem, an analytical expression of the criterion was proposed, which makes it possible to assess the applicability of the processing strategy for the given geometric parameters. The adequacy of the proposed criterion is confirmed by machine and natural experiments.

Lectin-Induced RBC Agglutination: Chemical vs. Cryofixation

1980 ◽  
Vol 38 ◽  
pp. 664-665
Author(s):  
Dean A. Handley ◽  
Lanping A. Sung ◽  
Shu Chien
Keyword(s):  
Lectin Binding ◽  
Freeze Substitution ◽  
Electrostatic Charge ◽  
Geometric Parameters ◽  
Comparative Approach ◽  
Chemical Fixation ◽  
Cell Surfaces ◽  
Minimal Cell ◽  
Membrane Stiffness ◽  
Cell Contour

RBC agglutination by lectins represents an interactive balance between the attractive (bridging) force due to lectin binding on cell surfaces and disaggregating forces, such as membrane stiffness and electrostatic charge repulsion (1). During agglutination, critical geometric parameters of cell contour and intercellular distance reflect the magnitude of these interactive forces and the size of the bridging macromolecule (2). Valid ultrastructural measurements of these geometric parameters from agglutinated RBC's require preservation with minimal cell distortion. As chemical fixation may adversely influence RBC geometric properties (3), we used chemical fixation and cryofixation (rapid freezing followed by freeze-substitution) as a comparative approach to examine these parameters from RBC agglutinated with Ulex I lectin.

Focusing of Visuospatial Attention

2001 ◽  
Vol 15 (4) ◽  
pp. 256-274 ◽  
Author(s):  
Caterina Pesce ◽  
Rainer Bösel
Keyword(s):  
Reaction Times ◽  
Visual Space ◽  
Spatial Relation ◽  
Stimulus Onset ◽  
Visuospatial Attention ◽  
Task Demands ◽  
Time Interval ◽  
Behavioral Studies ◽  
Task Conditions ◽  
Simple Rt

Abstract In the present study we explored the focusing of visuospatial attention in subjects practicing and not practicing activities with high attentional demands. Similar to the studies of Castiello and Umiltà (e. g., 1990) , our experimental procedure was a variation of Posner's (1980) basic paradigm for exploring covert orienting of visuospatial attention. In a simple RT-task, a peripheral cue of varying size was presented unilaterally or bilaterally from a central fixation point and followed by a target at different stimulus-onset-asynchronies (SOAs). The target could occur validly inside the cue or invalidly outside the cue with varying spatial relation to its boundary. Event-related brain potentials (ERPs) and reaction times (RTs) were recorded to target stimuli under the different task conditions. RT and ERP findings showed converging aspects as well as dissociations. Electrophysiological results revealed an amplitude modulation of the ERPs in the early and late Nd time interval at both anterior and posterior scalp sites, which seems to be related to the effects of peripheral informative cues as well as to the attentional expertise. Results were: (1) shorter latency effects confirm the positive-going amplitude enhancement elicited by unilateral peripheral cues and strengthen the criticism against the neutrality of spatially nonpredictive peripheral cueing of all possible target locations which is often presumed in behavioral studies. (2) Longer latency effects show that subjects with attentional expertise modulate the distribution of the attentional resources in the visual space differently than nonexperienced subjects. Skilled practice may lead to minimizing attentional costs by automatizing the use of a span of attention that is adapted to the most frequent task demands and endogenously increases the allocation of resources to cope with less usual attending conditions.

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