DOSING OF DIFFICULT-TO-SOW SEEDS BY SEEDING DEVICES

2019 ◽  
pp. 203-214
Author(s):  
N.P. Kryuchin ◽  
A.N. Kryuchin
Keyword(s):  
Optimal Design ◽  
Experimental Studies ◽  
Technological Scheme ◽  
Operational Parameters ◽  
Labor Costs ◽  
High Quality ◽  
Original Technique ◽  
Laboratory Setup

The sowing unit is one of the main devices of any planter, determining the quality of sowing, especially when it comes to the sowing unit of the central dosing. The article describes the proposed technological scheme of sowing of difficult seeds with a pin-disc type metering device. Its feature is the presence of an activator of seed outflow from the bunker. The proposed apparatus is capable of dispensing hard-to-sowing seeds with high quality, which include most of the seeds of cereal grasses (and not only). An original technique and a specially developed laboratory setup for assessing the longitudinal uniformity of seeding are described. The essence of the technique consists in sowing seeds on a moving horizontal platform with sectors of the same size. With its use, time and labor costs for conducting experiments are significantly reduced. The results of theoretical and experimental studies to determine the optimal design and operational parameters of the proposed device are given. Analysis of the results of the research is presented herewith.

Impact of layup rate on the quality of fiber steering/cut-restart in automated fiber placement processes

2015 ◽  
Vol 22 (2) ◽  
pp. 165-173 ◽  
Author(s):  
Jihua Chen ◽  
Teresa Chen-Keat ◽  
Mehdi Hojjati ◽  
AJ Vallee ◽  
Marc-Andre Octeau ◽  
...  
Keyword(s):  
Compaction Pressure ◽  
Experimental Studies ◽  
Process Condition ◽  
Processing Parameters ◽  
Experimental Results ◽  
High Quality ◽  
Fiber Placement ◽  
Automated Fiber Placement

AbstractDeveloping reliable processes is one of the key elements in producing high-quality composite components using an automated fiber placement (AFP) process. In this study, both simulation and experimental studies were carried out to investigate fiber steering and cut/restart under different processing parameters, such as layup rate and compaction pressure, during the AFP process. First, fiber paths were designed using curved fiber axes with different radii. Fiber placement trials were then conducted to investigate the quality of the steered fiber paths. Furthermore, a series of sinusoidal fiber paths were fiber placed and investigated. Moreover, a six-ply laminate with cut-outs in it was manufactured in the cut/restart trials. The accuracy of the fiber cut/restart was compared at different layup rates for both one- and bi-directional layups. Experimental results show that it was possible to layup steered fiber paths with small radii of curvature (minimum 114 mm) designed for this study when the proper process condition was used. It was observed from the cut/restart trials that the quality of tow cut was independent of layup speed; however, the accuracy of tow restart was related to the layup speed. The faster the layup speed, the less accurate was the tow restart.

scholarly journals DEVELOPMENT AND RESEARCH OF PROMISING SCHEMES FOR DIVIDING PIPES INTO DIMENSIONAL BILLETS

2021 ◽  
pp. 30-37
Author(s):  
Sergii Karnaukh
Keyword(s):  
Mathematical Model ◽  
Experimental Studies ◽  
Connecting Rod ◽  
High Quality ◽  
Cutting Knife ◽  
3D Software ◽  
The Mathematical Model ◽  
Cut Surface ◽  
Deform 3D

The purpose of this work is to study the known method of division of pipes by introducing a figure knife and the development of promising designs of equipment for division of pipes into measured workpieces. Based on the analysis of the actuating crank-slider mechanisms used in the equipment for division of pipes into measured workpieces, promising schemes of short-connecting rod mechanisms have been discovered that provide a local pipe section along the perimeter. The developed design of the device for dividing pipes into dimensional workpieces by the eccentric twisting method, which contains a wedge-joint mechanism in combination with a compact circular actuator, also allows to reduce energy and power costs for separation, reduce the consequences of instantaneous unloading of equipment and ensure high quality workpieces. A mathematical model of the proposed equipment was developed and the modeling of the cutting process was carried out using the DEFORM-3D software package. The analysis of the results obtained showed that in the extreme positions of the knives, jamming of the knives is possible. To eliminate jamming, it is necessary that the knives do not reach the extreme position. The adequacy of the mathematical model is confirmed by experimental studies. The error of the calculated and measured values of the torque on the cutting knife does not exceed 10%. This is due to the need for a more correct accounting of friction on the contact surfaces of the equipment. Cut tubular blanks have high geometric accuracy and high quality of the cut surface.

scholarly journals The influence of the roll gap of the aggregate mill “Melnik 100 Lux” on the yield and quality of wheat, rye and triticale flour

2021 ◽  
pp. 76-81
Author(s):  
Roman Khazhsetovich Kandrokov ◽  
Aleksandr Alekseevich Ryndin ◽  
Mikhail Aleksandrovich Latyshev
Keyword(s):  
Total Yield ◽  
First Grade ◽  
Technological Scheme ◽  
Optimal Parameters ◽  
High Quality ◽  
Roll To Roll ◽  
Yield And Quality ◽  
Rye Flour ◽  
Roll Gap

Research has been carried out to determine the effect of the roll gap of the aggregate mini mill “Melnik 100 Lux” on the yield of wheat, rye and triticale flour. The technological scheme of a mini-mill consists of only 3 systems - two torn and one grinding, which are clearly not enough to separate the grain of various crops into anatomical parts during grinding to obtain high-quality bakery flour. Based on the results of the studies, the optimal roll-to-roll clearances of the aggregate mill installation "Melnik 100 Lux" were established. For wheat milling, they were 0.25 mm on the I  torn system and 0.15 mm on the II torn system, for rye milling they were 0.25 mm on the I torn system and 0.15 mm on the II torn system and triticale grinding was 0.20 mm on the I torn system and 0.10 mm on the II torn system. The highest total yield of wheat bakery flour with optimal parameters of the roll gap was 71.7 %, incl. 44.4 % premium flour and 27.3 % first grade flour; the highest total yield of rye bakery flour with optimal parameters of the roll gap was 70.0 %, incl. 52.2 % seeded premium rye flour and 17.8 % special rye flour; the highest total yield of triticale bakery flour with optimal parameters of the roll gap was 72.2 %, incl. 48.1 % triticale flour of the highest grade T-60 and 17.8 % triticale flour T-80.

Evaluation of Influence of Thermal Methods of Metal Separation Cutting on Welding Quality

2017 ◽  
Vol 265 ◽  
pp. 755-761 ◽  
Author(s):  
A.K. Tingaev ◽  
M.A. Ivanov ◽  
A.M. Ulanov
Keyword(s):  
Heat Affected Zone ◽  
Welded Joints ◽  
Heat Input ◽  
Experimental Studies ◽  
Welding Process ◽  
Regulatory Requirements ◽  
High Quality ◽  
Thermal Methods ◽  
Welding Seam

We have investigated a possibility of obtaining high-quality welded joints after oxygen and plasma cutting of steel С355 without removing the heat-affected zone (HAZ), in which the changes in chemical, phase and structural compositions are observed. Numerical and experimental studies of the effect of heat input of MAG and Submerged Arc welding on the quality of welded joints are performed. In particular, it was found that when the heat input of welding is at least 6.5 kJ/cm, the metal of HAZ of the edges after cutting is heated during the welding to temperatures above Ас3, which leads to its full recrystallization. When the heat input of welding is at least 10 kJ/cm, the edges after cutting are completely melted and become a part of the welding seam metal. The presence of extensive areas of melting and recrystallization of the edges in the welding process contributes to obtaining high-quality welded joints without removing the HAZ of the edges after cutting. To verify the results of numerical studies, experimental tests of control welded joints were conducted, which showed that the values of bending angle and impact toughness of the welding seam metal and heat affected zone are significantly above the regulatory requirements to quality of welded joints, and not less than the same requirements for steel С355. The obtained results confirm the possibility of revising domestic regulatory requirements for the steel constructions production in terms of the preparation of edges for welding using technologies of thermal cutting without subsequent machining.

scholarly journals Visualization of the Operational Parameters Archive of a Nuclear Reactor

2021 ◽  
Author(s):  
Stanislav Ten ◽  
Andrey Zagrebayev ◽  
Victor Pilyugin
Keyword(s):  
Nuclear Reactor ◽  
Scientific Visualization ◽  
Experimental Studies ◽  
Monitoring Systems ◽  
Dynamic Visualization ◽  
Operational Parameters ◽  
Operating Personnel ◽  
Protection Systems ◽  
Express Analysis

For the most part, the solution of the problem of visualizing any data depends on the structure, size and type of data provided. In this work, the data are archives of RBMK or VVER reactors provided from different control and protection systems of the reactors. Despite the fact that several visualization complexes have already been developed, the visualization task is still relevant due to the necessity to improve the quality of monitoring systems and operational personnel. This paper describes the mathematical apparatus for express analysis of the archive of operational parameters of a VVER nuclear reactor. The developed software makes it possible to carry out express analysis of the VVER reactor archive in terms of plotting altitude or time graphs, as well as using dynamic visualization using the Chernoff faces method, which in turn can provide scientific and practical benefits due to improvement the work quality of operating personnel and conduction analysis of situations that requires additional attention and more detailed analysis. Also, the fundamental concept of this work is the method of scientific visualization, which is widely used in various theoretical and experimental studies. It can be said that the main aim of scientific visualization is to make invisible visible.

Influence of Neighborhood Forms on the Quality of Pseudorandom Number Generators' Work Based on Cellular Automata

2020 ◽  
pp. 43-78
Author(s):  
Sergii Bilan
Keyword(s):  
Cellular Automata ◽  
Random Number ◽  
Initial Conditions ◽  
Experimental Studies ◽  
High Quality ◽  
Random Number Generators ◽  
Optimal Dimension ◽  
Pseudo Random Number ◽  
Nist Tests

The chapter analyzes modern methods for constructing pseudo-random number generators based on cellular automata. Also analyzes the influence of neighborhood forms on the evolution of the functioning of cellular automata, as well as on the quality of the formation of pseudo-random bit sequences. Based on the use of various forms of the neighborhood for the XOR function, the quality of generators was analyzed using graphical tests and NIST tests. As a result of experimental studies, the optimal dimension of cellular automata and the number of heterogeneous cells were determined, which make it possible to obtain a high-quality pseudo-random bit sequence. The obtained results allowed to formulate a method for constructing high-quality pseudo-random number generators based on cellular automata, as well as to determine the necessary initial conditions for generators. The proposed generators allow to increase the length of the repetition period of a pseudo-random bit sequence.

Evaluation of the Mass (Weight) Characteristics of the Elements of an Airplane Glider According to the Criterion of «Loading Intensity» at the Initial Stages of Design

2020 ◽  
Vol 25 (1) ◽  
pp. 92-96
Author(s):  
V.F. Ponomarev ◽  
◽  
I.V. Skibina ◽  
Keyword(s):  
Optimal Design ◽  
Complex Shape ◽  
Minimum Weight ◽  
High Quality ◽  
Design Life ◽  
Wide Range ◽  
Unit Design ◽  
Production And Operation

The process of designing airframe assemblies solves the problem of creating an optimal design in terms of quality that ensures the fulfillment of a wide range of highly conflicting requirements. Key requirements include: • provision of high quality of complex shape of the outer (aerodynamic) surface of the units, especially the wing and plumage. • providing strength from the effects of external and internal loads. • provision of a given resource and design life • ensuring the manufacturability of the production and operation of the structure, its maintainability, etc. At the same time, the satisfaction of basic requirements should be ensured with a minimum weight (weight) of the unit design.

A Preliminary Investigation of the Empirical Validity of Study Quality Appraisal

2016 ◽  
Vol 50 (1) ◽  
pp. 14-22 ◽  
Author(s):  
Bryan G. Cook ◽  
Danielle N. Dupuis ◽  
Asha K. Jitendra
Keyword(s):  
Special Education ◽  
Preliminary Investigation ◽  
Experimental Studies ◽  
Evidence Base ◽  
Study Quality ◽  
Students With Learning Disabilities ◽  
Quality Appraisal ◽  
High Quality ◽  
Evidence Based Practices

When classifying the evidence base of practices, special education scholars typically appraise study quality to identify and exclude from consideration in their reviews unacceptable-quality studies that are likely biased and might bias review findings if included. However, study quality appraisals used in the process of identifying evidence-based practices for students with learning and other disabilities have not been empirically validated (e.g., studies classified as unacceptable quality shown to have different, and presumably more biased, effects than high-quality studies). Using Gersten et al.’s (2005) approach for appraising the quality of group experimental studies in special education, we examined whether (a) studies classified as unacceptable quality and high quality had meaningfully different effects and (b) unacceptable-quality studies were more likely to have outlying effects than high-quality studies among 36 group experimental studies that investigated the effectiveness of instructional practices for students with learning disabilities. Our preliminary analyses found that the effects of unacceptable-quality studies were not meaningfully different from the effects of high-quality studies. We discuss implications of these findings and call for more research to be conducted in this area.

scholarly journals RESULTS OF EXPERIMENTAL STUDIES OF THE PROCESS OF CUTTING SOFT WOOD USING DISC BLADES

2021 ◽  
Vol 11 (2) ◽  
pp. 99-107
Author(s):  
Vladimir Ivanovskiy
Keyword(s):  
Feed Rate ◽  
Experimental Error ◽  
Experimental Studies ◽  
High Accuracy ◽  
Regression Equation ◽  
Major Influence ◽  
Laboratory Setup ◽  
Main Factors ◽  
Basic Level

The processes of chipless deformation of wood by means of a force field are less laborious and are not as-sociated with significant energy consumption and irrecoverable waste, as in the processing of such wood by chip cutting. To determine the cutting force on a laboratory setup, a factorial experiment was carried out for two main factors: the diameter of the cutting circle and the sharpening angle of the circular blade. Then, to estimate the va-riance characterizing the experimental error, a separate series of 5 experiments was set in the center of the plan, i.e. in conditions where each factor varies at the basic level. A mathematical model in natural values of the factors for the force deformation of wood by a disk has been obtained. Further, the following influencing factors have been investigated: wood thickness and feed rate. The analysis of the obtained regression equation indicates that the thickness of the cut workpiece has a major influence on the cutting power, which imposes a limitation on the feed rate. The next 4-factor experiment made it possible to reveal the combined influence of the named factors, as well as the moisture content of the wood and the length of the cut, on the quality indicators of the cutting process with circular knives. The analysis of the adequacy of the obtained regression equation showed its high accuracy and made it possible to reveal the influence of dominant external factors on the quality of the separated surfaces

scholarly journals Research of electrical characteristics of increased uniformity LAN-cables

2020 ◽  
Vol 30 (4) ◽  
pp. 14-22
Author(s):  
A. K. Bulkhin ◽  
V. F. Klyuchnikov ◽  
V. V. Bannov ◽  
V. B. Popov
Keyword(s):  
Mutual Influence ◽  
Experimental Studies ◽  
Access Networks ◽  
Measuring System ◽  
Technological Equipment ◽  
Broadband Access ◽  
Electrical Characteristics ◽  
High Quality ◽  
Broadband Access Networks

Formulation of the problem. At present, symmetric LAN cables are widely used in structured cabling systems (SCS) and fixed broadband access (BBA) networks in the world and in Russia. Practical experience of using LAN cables on real broadband access networks shows that high-quality transmission can only be achieved using high-quality highly uniform cables.Objective. Study of the dependence of the quality of LAN-cables on technological equipment and the quality of materials, which provide increased cable uniformity.Results. Based on the experimental studies carried out with the use of a modern measuring system, the main electrical characteristics of the transmission and the mutual influence of the most popular four-pair LAN-cable of the 5e category of the U/UTP4×2×0.52 type in the frequency range up to 100 MHz are determined. It is shown that to ensure high and stable transmission characteristics and mutual influence, modern technological equipment must be equipped with cable quality parameters automatic control systems and it is necessary to choose reliable suppliers when using domestic production materials.Practical significance. For the effective practical use of LAN cables on fixed broadband access networks and in SCS, it is very important to have high stability of electrical characteristics and their compliance with rather high established standards. This is possible only by ensuring high geometric and structural homogeneity of the structural elements of LAN cables.

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