scholarly journals Modeling of soil tilling and planting unit

2020 ◽  
Vol 11 (3) ◽  
pp. 61-66
Author(s):  
T. V. Gayday ◽  
◽  
Keyword(s):  
Mathematical Model ◽  
Technological Process ◽  
Soil Surface ◽  
Point Of View ◽  
Design Parameters ◽  
Technical Parameters ◽  
Initial Seed ◽  
Resistance Forces ◽  
Green Manure Crops

This research is aimed at increasing the efficiency of the technical and technological process of small-seeded green manure crops sowing by combining technological operations of a soil-tilling and planting unit (STPU) and improving the design parameters of the scatterer. A scheme of a soil-tilling and planting unit with a scatterer and a control means is proposed, and a concept of the functioning of the technological process of a soil-tilling and planting unit is determined. To study the technological process of small-seeded crops sowing, which is implemented by the STPU, it is important to build a mathematical model of the dynamics of the process for further optimization of both the process itself and the parameters of the sowing apparatus. The simulation includes the development of a model of the dynamics of the STPU travel on the field, taking into account the corresponding traction and resistance forces, the turning moments and the moments of resistance to turning of the tractor, as well as the calculation of the parameters of the seed output from the seed hopper, the dynamics of its travel in the seed tubes to the point of contact with the scatterer and the seed scattering formula on the soil after exiting the seed tubes. The obtained models allow us to determine the technical parameters of various working devices included in the STPU, from the point of view of their compliance with the activities for the quality of the task. The main attention is focused on determining the design parameters of STPU elements based on the construction and research of relevant mathematical models and calculation expressions. In this direction, a study was carried out to determine the optimal components: geometric design parameters and the angular velocity of the seed roller (wк), the initial seed speed in the seed tubes specified by the compressor fan (Vcf), the angle of inclination of the diffuser plate (β) and its height above the soil surface (Hs)) An advanced mathematical model allows you to simulate tillage and sowing units with different working widths.

scholarly journals Technical parameters of high speed lines as the determinant for selection of rolling stock

2018 ◽  
Vol 180 ◽  
pp. 06007
Author(s):  
Jan Raczyński
Keyword(s):  
High Speed ◽  
Point Of View ◽  
Rolling Stock ◽  
High Speed Rail ◽  
Technical Parameters ◽  
Rail Vehicle ◽  
Railway Infrastructure ◽  
The One ◽  
Selection Of

Choosing a high-speed rail vehicle depends on many factors. On the one hand, there are requirements for ensuring the quality of service for passengers, on the other hand, there are constraints resulting from the parameters of available infrastructure. Also a relation of the benefit and financial costs associated with the purchase and the operation of rolling stock is essential. Technical characteristics of vehicles selected for operating a particular system is a compromise between the three groups of requirements. In this article technical parameters of railway infrastructure and rolling stock are classified and then analysed from the TSI requirements point of view.

scholarly journals Multi-section coupling device for aggregation of modern seeding machines

2021 ◽  
Vol 1 (25) ◽  
pp. 140-149
Author(s):  
G.G. Parkhomenko ◽  
◽  
S.I. Kambulov ◽  
I.V. Bozhko ◽  
◽  
...  
Keyword(s):  
Technological Process ◽  
Rational Design ◽  
Climatic Conditions ◽  
Design Parameters ◽  
Coupling Device ◽  
Rational Design Parameters ◽  
High Level ◽  
Relationship Of ◽  
The Relationship

Choosing rational design parameters of the coupling device for multi-section aggregation of seeders, it is possible to ensure full loading of the power unit while maintaining quality indicators of the technological process at a sufficiently high level. Foreign aggregates are not suitable for use in the Russian Federation due to the different soil and climatic conditions. Purpose of the study: to develop an effective device for multi-section aggregation suitable for domestic modern seeding machines. Subject of the research: the relationship of design parameters and modes of operation of the device for multi-section aggregation of seeders with indicators of the technological process of sowing. A monographic survey of known structures has been carried out, a device for multi-section aggregation of seeding machines has been substantiated by the design and construction method, indicators of the technological process of sowing have been experimentally obtained. The developed coupling device for multi-section aggregation consists of a central frame resting on the wheels and articulated side sections: left and right, which fold when transporting the seeding unit. The total working width of the seeding unit is up to 12.5 meters. According to the research results, the quality of the technological process by the seeding devices meets the regulatory requirements. The instability of the total seeding (0.6–1.1 % for barley and 0.4–0.7 % for wheat) is within the tolerance (up to 3 percent); uneven seeding between devices 3.9–4.2 percent (barley) and 2.6–4.2 percent (wheat) corresponds to the norm (up to 5 percent). The number of seeds embedded at a predetermined depth of the soil corresponds to the required (not less than 80 percent) and was 81.8–83.9 percent for barley and 80.1–83.3 percent for wheat. Not embedded seeds were found in the soil.

scholarly journals MODELLING AND OPTIMIZATION OF WAVEGUIDE POLARIZERS WITH THE ACCOUNT OF IRISES THICKNESS

2020 ◽  
Author(s):  
Andrew Bulashenko ◽  
◽  
Stepan Piltyay ◽  
Keyword(s):  
Mathematical Model ◽  
Axial Ratio ◽  
Engineering Problem ◽  
Point Of View ◽  
Design Parameters ◽  
Differential Phase Shift ◽  
Polarization Characteristics ◽  
Electromagnetic Characteristics ◽  
Optimal Values

Today, there is a continuous improvement of modern satellite telecommunication systems caused by the requirements of constantly increasing information volumes. The fundamental elements of such systems are antennas with polarization processing of signals. This processing is mainly performed using microwave waveguide polarizers and orthomode transducers. Therefore, the development and optimization of new waveguide polarizers is a relevant engineering problem. The simplest from the technological point of view are the polarizers based on waveguides with irises. Analysis and optimization of electromagnetic characteristics of a polarizer based on a square waveguide with irises are the goals of the presented research. To solve this optimization problem we have created a new mathematical model, which allows to investigate the influence of the design parameters of the polarizer on its electromagnetic characteristics. A new mathematical model of the polarizer based on square waveguide with irises was created using wave transmission and scattering matrices of the structure elements. Developed mathematical model takes into account the thickness of the irises. A new mathematical model of a waveguide polarizer is based on the general wave scattering matrix. This matrix was calculated using the theory of microwave circuits. The main characteristics of the square waveguide polarizer were expressed through the elements of this matrix. The developed new mathematical model of a square waveguide polarizer with irises takes into account the heights of the irises, the distances between them and their thickness. The new mathematical model is simpler and faster for the determination of the electromagnetic characteristics of the waveguide polarizer compared to the finite integration technique, which is often applied to analyze microwave devices for various purposes. In addition, developed new mathematical model of the waveguide iris polarizer allows to estimate the variations of all required electromagnetic characteristics if the structure parameters deviate from their optimal values. Using the created mathematical model we have carried out the optimization of the polarizer matching and polarization characteristics in the operating satellite Ku-band 10.7–12.8 GHz. Simulated optimum design of the waveguide polarizer provides VSWR for horizontal and vertical polarizations less than 3.26. Optimized differential phase shift is 90° ± 4.2°. Axial ratio of the waveguide iris polarizer is less than 1.43 dB. Corresponding XPD is higher than 21.7 dB.

scholarly journals Optimization of structural and kinematic parameters of separator of vegetable and melon crops

2020 ◽  
Vol 107 (3) ◽  
pp. 105-112
Author(s):  
D. Babenko ◽  
◽  
O. Gorbenko ◽  
N. Dotsenko ◽  
N. Kim
Keyword(s):  
Technological Process ◽  
Optimal Combination ◽  
Design Parameters ◽  
Kinematic Parameters ◽  
Optimization Criteria ◽  
Seed Loss ◽  
Factors Influencing ◽  
Lattice Surface ◽  
Main Factors

Optimization of structural and kinematic parameters of separator of vegetable and melon crops It was determined in the article the optimization criteria, which were used to evaluate the quality of the technological process. The main factors influencing the operation of the vibrating separator are revealed: the angle of inclination of the lattice surface, the frequency of oscillations of the sieve, the amplitude of its oscillations, the angle of application of the oscillation force and the length of the sieve. The optimization criteria were chosen: purity, magnitude of injury and the level of seed loss. The ranges of optimal combination of independent factors are indicated. Keywords: vegetable and melon crops, separator, kinematic and design parameters.

Analysis of power system stabilizer Pareto optimisation-when taking into account the uncertainty of power system mathematical model parameters

2011 ◽  
Vol 60 (4) ◽  
pp. 385-398 ◽  
Author(s):  
Adrian Nocoń ◽  
Stefan Paszek
Keyword(s):  
Mathematical Model ◽  
Power System ◽  
Parameter Uncertainty ◽  
Point Of View ◽  
Power System Stabilizer ◽  
Model Parameters ◽  
Criterion Function ◽  
Tournament Selection ◽  
System Stabilizer

Analysis of power system stabilizer Pareto optimisation-when taking into account the uncertainty of power system mathematical model parameters The paper presents analysis of optimisation results of power system stabilizer (PSS) parameters when taking into account the uncertainty of mathematical model parameters of the power system (PS) elements. The Pareto optimisation was used for optimisation of the system stabilizer parameters. Parameters of five stabilizers of PSS3B type were determined in optimisation process with use of a genetic algorithm with tournament selection. The results obtained were assessed from the point of view of selecting the criterion function. The analysis of influence of the parameter uncertainty on the quality of the results obtained was performed.

scholarly journals EFFICIENCY OF TECHNOLOGICAL PROCESS OF FORESTRY AND DEGREE EFFECTS OF TECHNOLOGICAL AND NATURAL FACTORS

2017 ◽  
Vol 7 (3) ◽  
pp. 167-175
Author(s):  
Иван Гарус ◽  
Ivan Garus ◽  
Шуфан Янь ◽  
Shufan Yan'
Keyword(s):  
Technological Process ◽  
Climatic Factors ◽  
Technological Development ◽  
Average Diameter ◽  
Point Of View ◽  
Forest Environment ◽  
Operator Training ◽  
Machine Systems ◽  
The Impact

When implementing the technological process in the forest for logging operations, various factors influence, as well as taxation indicators such as (average diameter, height of the stand, reserve per hectare, availability of growth, completeness, etc.), natural climatic factors (Soil type carrying capacity of soils, depth of snow cover, etc.), degree of operator training, etc. One of the main tasks of rational justification of the technological process of cutting areas development is to find and combine controlled factors, at which performance indicators would be extreme. The most suitable variant of the technological development of the cutting area assumes what should be the intensity of logging, the layout of the cutting area, the number of loading points, and the productivity of harvesting machines. This task will be solved taking into account the influence of logging equipment and technology on the forest environment. The state of the stand left for growing after selective felling and its further development depends on the machine systems used in logging operations. The most important factor in the development of felling areas is the degree of intensity of felling. Since the quality of logging operations will depend on the method of cutting in the development of the cutting area (from the point of view of the impact on the natural environment, the soil cover, the left part of the stand, the adolescent).

scholarly journals Methods of calculation of the power for dough kneading with the use of blade-free working part

2020 ◽  
Vol 100 (4) ◽  
pp. 75-85
Author(s):  
Igor Stadnik ◽  
Oksana Pylypets ◽  
Mykhailo Pylypets ◽  
Volodymyr Poddubny ◽  
Olena Kolomiiets
Keyword(s):  
Technological Process ◽  
Rotation Frequency ◽  
Design Parameters ◽  
Technical Solution ◽  
Friction Forces ◽  
Cylindrical Working ◽  
Increase Productivity ◽  
Main Components ◽  
Baking Industry

Baking industry plays one of the most important roles in the production of vital food products. The quality of the bakery products can be improved through the improvement of quality in technological process of dough kneading. A technical solution for providing greater contact with the environment, reducing the duration of the process, and, accordingly, increase productivity due to the developed design of a new machine with a cylindrical working body was proposed. The ways of regulating the course of the technological process in the working chamber of a new kneading machine are considered. They are based on the change of parameters: duration of kneading, temperature, humidity, rotation frequency of the working body. A method of calculating the required power based on the process of kneading the dough is proposed. It allowed obtaining a theoretical calculation of power consumption at unknown values of the friction forces action on the kneading drum, but the known frequency of its rotation with the corresponding design parameters and factors of influence. In addition, it makes possibility to determine the effort main components that affect to the power increase of the working body drive.

scholarly journals A study on the hopper unloading duration of the harvesting machine at different technical parameters

2020 ◽  
Vol 12 (2) ◽  
pp. 140-143
Author(s):  
G. Tihanov
Keyword(s):  
Mathematical Model ◽  
Regression Analysis ◽  
Technological Process ◽  
Flow Rate ◽  
Multivariate Regression ◽  
Multivariate Regression Analysis ◽  
Technical Parameters ◽  
Actual Flow Rate ◽  
Actual Flow ◽  
Production Conditions

Abstract. When unloading grain harvester hoppers at standstill the time of emptying the hopper has a significant effect on the harvester productivity. The paper is about a conducted survey in 15 agricultural farms with 15 harvesters monitored including 14 models of 6 different brands during wheat harvesting. The time for emptying the grain hopper of the harvesters was defined by measuring the time. It was found that the actual time for emptying the hoppers of the studied harvesters was 134.85 s, and the actual flow rate of unloading of the screw in them being 69.63 L/s on average. A multivariate regression analysis was performed on the effect of the harvester grain hopper volume and the actual flow rate of the unloading screw on the time from switching on the unloading screw till its switching off in various grain harvesters. An adequate mathematical model of the effect of the hopper volume and the flow rate of the unloading screw of grain harvesters on the time for emptying the grain hopper under real production conditions has also been created. These results can also be used for minimizing costs in the technological process at harvesting.

scholarly journals Optimization of process lability in logistics systems

2020 ◽  
Vol 3 (SI3) ◽  
pp. First
Author(s):  
Csaba Imre Hencz ◽  
Tamás Hartványi
Keyword(s):  
Mathematical Model ◽  
Organizational Structure ◽  
Process Management ◽  
Management Practice ◽  
Quality Criteria ◽  
Point Of View ◽  
Specific Product ◽  
Management Procedures ◽  
The Right

The management and effective operation of enterprise systems – depending on ever-changing environmental impacts – can only be achieved by an appropriate information management practice. Today, in the corporate environment, an astonishing amount of data (often unstructured) is generated. The efficient processing of these data is by no means straightforward and unambiguous, and thus presents significant challenges for user systems. It is typical of the process that the customer would like to receive the product as soon as possible, but at least at a pre-determined time. Thus the quality of service is determined not only by the quality of the product but also by its availability. As is well known, the mission of logistics is to ensure the ordered product is delivered in the right time, place, quality, quantity and cost. In this mission has a specific product, finite duration, organizational structure with defined responsibilities, activities necessary for its production, and have the resources to carry out these activities. The processing of the product is divided into several stages, which form a separate unit from the managerial point of view. Like product procession, a section has specific products, activities, and organizational structure. The end of the phase is the production / implementation of the products / services specified therein, provided that they meet the required quality criteria. In our paper, we propose a methodology, which – together with the related mathematical model – can offer an opportunity to reduce entropy in logistics processes. The aim of the research is to develop a model that can be used to quantify the logistical process uncertainty. We believe that research will help find a way to overcome the shortcomings of current process management procedures. We give the formal description of the mathematical model and present an example of its application.

COMBINATORIAL POLYNOMIALLY COMPUTABLE CHARACTERISTICS OF SUBSTITUTIONS AND THEIR PROPERTIES

2020 ◽  
Vol 7 (2) ◽  
pp. 34-41
Author(s):  
VLADIMIR NIKONOV ◽  
◽  
ANTON ZOBOV ◽  
Keyword(s):  
Mathematical Expectation ◽  
Point Of View ◽  
Small Range ◽  
Computational Point ◽  
Wide Range ◽  
Bijective Function ◽  
The Difference ◽  
Element Base ◽  
Selection Of

The construction and selection of a suitable bijective function, that is, substitution, is now becoming an important applied task, particularly for building block encryption systems. Many articles have suggested using different approaches to determining the quality of substitution, but most of them are highly computationally complex. The solution of this problem will significantly expand the range of methods for constructing and analyzing scheme in information protection systems. The purpose of research is to find easily measurable characteristics of substitutions, allowing to evaluate their quality, and also measures of the proximity of a particular substitutions to a random one, or its distance from it. For this purpose, several characteristics were proposed in this work: difference and polynomial, and their mathematical expectation was found, as well as variance for the difference characteristic. This allows us to make a conclusion about its quality by comparing the result of calculating the characteristic for a particular substitution with the calculated mathematical expectation. From a computational point of view, the thesises of the article are of exceptional interest due to the simplicity of the algorithm for quantifying the quality of bijective function substitutions. By its nature, the operation of calculating the difference characteristic carries out a simple summation of integer terms in a fixed and small range. Such an operation, both in the modern and in the prospective element base, is embedded in the logic of a wide range of functional elements, especially when implementing computational actions in the optical range, or on other carriers related to the field of nanotechnology.

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