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 TUNABLE POLARIZERS FOR X-BAND RADAR AND TELECOMMUNICATION SYSTEMS

2021 ◽  
Author(s):  
Andrew V. Bulashenko ◽  
Stepan I. Piltyay ◽  
Yelyzaveta I. Kalinichenko ◽  
Oleksandr V. Bulashenko
Keyword(s):  
Mathematical Model ◽  
Essential Elements ◽  
Design Parameters ◽  
Adaptive Antenna ◽  
Engineering Systems ◽  
The Finite Element Method ◽  
Radar Systems ◽  
X Band ◽  
Polarization Characteristics ◽  
Electromagnetic Characteristics

Background. Nowadays processing of signal polarizations is widely applied in modern information and telecommunication radio engineering systems for different purposes. Commonly polarization processing is carried out in polarization adaptive antenna systems. The essential elements of such systems are transformation devices for polarization processing. They perform the transformation of the types of polarization and separate the different types to isolated channels. The most simple, effective, technological and actual for analysis are polarizers based on square waveguides with irises and posts. Objective. The purpose of this work is to improve the electromagnetic characteristics of an adjustable polarizer by creating a mathematical model of such device. The device must provide optimized polarization and matching characteristics. Methods. The article presents a mathematical model of a waveguide polarizer with irises and posts by the decomposition method using wave transmission and scattering matrices. The developed model takes into account the influence of the polarizer design parameters on its characteristics. Results. The article contains the results of calculations based on the developed mathematical model of the polarizer. In addition, the results of modelling of the device using the finite element method are presented for comparison. For the developed waveguide polarizer we have compared the polarization characteristics and the matching. Conclusions. The created mathematical model allows us to effectively analyse the characteristics when the design parameters change. These parameters include the size of the wall of the square waveguide, the heights of the irises and posts, the distance between them, the thickness of the irises and posts. The developed polarizer is recommended for the application in modern telecommunication and radar systems.

scholarly journals TUNABLE POLARIZERS FOR X-BAND RADAR AND TELECOMMUNICATION SYSTEMS

2021 ◽  
Author(s):  
Stepan Piltyay ◽  
Andrew Bulashenko
Keyword(s):  
Mathematical Model ◽  
Essential Elements ◽  
Design Parameters ◽  
Adaptive Antenna ◽  
Engineering Systems ◽  
The Finite Element Method ◽  
Radar Systems ◽  
X Band ◽  
Polarization Characteristics ◽  
Electromagnetic Characteristics

Background. Nowadays processing of signal polarizations is widely applied in modern information and telecommunication radio engineering systems for different purposes. Commonly polarization processing is carried out in polarization adaptive antenna systems. The essential elements of such systems are transformation devices for polarization processing. They perform the transformation of the types of polarization and separate the different types to isolated channels. The most simple, effective, technological and actual for analysis are polarizers based on square waveguides with irises and posts.Objective. The purpose of this work is to improve the electromagnetic characteristics of an adjustable polarizer by creating a mathematical model of such device. The device must provide optimized polarization and matching characteristics.Methods. The article presents a mathematical model of a waveguide polarizer with irises and posts by the decomposition method using wave transmission and scattering matrices. The developed model takes into account the influence of the polarizer design parameters on its characteristics.Results. The article contains the results of calculations based on the developed mathematical model of the polarizer. In addition, the results of modelling of the device using the finite element method are presented for comparison. For the developed waveguide polarizer we have compared the polarization characteristics and the matching.Conclusions. The created mathematical model allows us to effectively analyse the characteristics when the design parameters change. These parameters include the size of the wall of the square waveguide, the heights of the irises and posts, the distance between them, the thickness of the irises and posts. The developed polarizer is recommended for the application in modern telecommunication and radar systems.

scholarly journals SUBSTANTIATION OF THE FORM AND DETERMINATION OF THE CONSTRUCTIVE PARAMETERS OF THE ROTATION ROLLER OF SOIL

2018 ◽  
Vol 13 (3) ◽  
pp. 72-76
Author(s):  
Гумар Булгариев ◽  
Gumar Bulgariev ◽  
Геннадий Пикмуллин ◽  
Gennadiy Pikmullin ◽  
Ильгиз Галиев ◽  
...  
Keyword(s):  
Analytical Study ◽  
Point Of View ◽  
Design Parameters ◽  
Industrial Complex ◽  
Stage Of Development ◽  
Pass Through ◽  
Spiral Plate ◽  
Working Device ◽  
Important Design

At the present stage of development of the country’s agro-industrial complex, the technological process of surface tillage by combined soil-cultivating machines, simultaneously combining a number of operations in one pass through the field, causes the presence in their designs of the necessary set of various promising working organs. In view of the foregoing, a rotary soil ripper with a spiral-plate working member equipped with radially directed teeth and connected by means of rods with end flanges has been developed. Also, the researched ripper has the limits of penetration of the working element in the form of flat discs equipped with flanges and the radial stop have the ability to rotate around their axes independently of the ripper shaft. An analytical study of the working units of this ripper was carried out from the point of view of the influence of their size and teeth on the process of interaction with the soil, on the basis of which some of their parameters were determined. In conclusion, it was concluded that the analytical equations obtained allow us to justify the choice of the most important design parameters of the proposed new design and design a toothed rotary working device that reduces to constructive implementation after calculating their basic dimensions.

scholarly journals Tunable square waveguide polarizer with irises and posts

2021 ◽  
Author(s):  
Stepan Piltyay
Keyword(s):  
Mathematical Model ◽  
Circular Polarization ◽  
Design Parameters ◽  
Adaptive Antenna ◽  
Radio Link ◽  
Engineering Systems ◽  
Polarization Signal ◽  
Fixed Orientation ◽  
Polarization Characteristics ◽  
Antenna Systems

Polarization signal processing is widely used in modern information and telecommunication systems for various purposes. Signal polarization processing is carried out in polarization-adaptive antenna systems. The key element of such systems is transformation devices for polarization processing. They perform the transformation of the types of polarization and separate the different types. The most commonly applied systems are the ones using a single circular polarization or two orthogonal circular polarizations simultaneously.The absence of the need for an accurate angle orientation between the transmitting and receiving antennas to establish communication is one of the basic advantages of this type of polarization. When using antenna systems with linear polarization, signal losses appear due to inconsistency in the orientation of the polarization planes of the transmitting and receiving antennas. This feature of circular polarization is important for satellite and many other telecommunications systems. In such systems it is difficult to maintain a fixed orientation of one antenna relative to the other. In addition, circular polarization is used to communicate with satellites orbiting the direction of the radio link. Regardless of antenna orientation, when using circular polarization, the received signal level is constant. These advantages explain why circular polarized antennas are widely used in radio engineering systems for various purposes. The paper presents the results of the development of a polarization device based on a square waveguide with two posts and two diaphragms in the frequency range from 7,7 to 8,5 GHz. The article contains the results of calculations using the developed mathematical model of the device. In addition, the results of modeling the device using the finite element method are presented for comparison. A comparison was made of the polarization characteristics and the match of the developed polarizer. The created mathematical model makes it possible to effectively analyze the characteristics when changing design parameters. These parameters include the size of the wall of the square waveguide, the heights of the diaphragms and pins, the distance between them, the thickness of the diaphragms and pins. The developed polarizer is suggested for the application in satellite telecommunication and radar systems.

scholarly journals SIMULATION OF COMPACT POLARIZERS FOR SATELLITE TELECOMMUNICATION SYSTEMS WITH THE ACCOUNT OF THICKNESS OF IRISES

2021 ◽  
Author(s):  
Andrew V. Bulashenko ◽  
Stepan I. Piltyay ◽  
Ivan V. Demchenko
Keyword(s):  
Mathematical Model ◽  
Design Parameters ◽  
Matrix Elements ◽  
Satellite Telecommunication ◽  
Telecommunication Systems ◽  
Satellite Télécommunication ◽  
Scattering Wave ◽  
The Matrix ◽  
Electromagnetic Characteristics ◽  
Ku Band

Background. One of the main problems in modern satellite telecommunication systems is to increase the volume of information transmission with simultaneous preservation of its quality. Key element of such systems is antenna systems with polarization processing, which is carried out using polarizers. Therefore, development of new polarizers and simple techniques for their analysis and optimization are important problems. The most simple, effective, technological and actual for analysis are polarizers based on waveguides with irises. Objective. The purpose of the paper is to create a mathematical model of the polarizer based on a square waveguide with irises, which allows analyzing the influence of polarizer’s design parameters on its electromagnetic characteristics. Methods. A mathematical model of the waveguide polarizer with irises is created by decomposition technique using transfer and scattering wave matrices. To take into account the irises’ thickness their equivalent T- and Π-shaped circuits were used. Results. We have developed mathematical model of the waveguide polarizer with irises, which takes into account their thickness and is based on the complete scattering wave matrix of the waveguide polarizer. The matrix has been obtained using the microwave circuit theory. The main characteristics of the waveguide polarizer were defined using matrix elements. The optimization of characteristics of a polarizer was carried out in the operating Ku-band 10.7–12.8 GHz. Conclusions. Suggested mathematical model of a waveguide polarizer with irises provides the account of heights of irises, distances between them and their thickness. The results obtained show that this model is simpler and faster for the calculation of electromagnetic characteristics compared to finite elements method, which is often used for analysis of microwave devices for various applications.

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.

On the Determination of Basic Dimensions of a Cam With a Translating Roller-Follower

2004 ◽  
Vol 126 (1) ◽  
pp. 143-147 ◽  
Author(s):  
Anirvan DasGupta ◽  
Amitabha Ghosh
Keyword(s):  
Detailed Analysis ◽  
Constant Pressure ◽  
Graphical Method ◽  
Point Of View ◽  
Numerical Example ◽  
Pressure Angle ◽  
The Common ◽  
Optimal Values

The problem of determination of basic dimensions from the point of view of follower jamming of a cam with translating roller-follower is addressed. Departing from the common practice of using only a constant pressure angle to assess jamming of the follower in its guide, this paper presents a detailed analysis of the problem taking into consideration the follower-guide friction. This leads to new bounds on the pressure angle. Based on the bounds obtained, a graphical method for determination of the optimal values of the basic dimensions is proposed. A numerical example is presented for the purpose of illustration.

Theoretical and Experimental Research on Design of Non-Resonant Gear Transformer

2014 ◽  
Author(s):  
Wang Shiying ◽  
Lv Ming ◽  
Ya Gang ◽  
Liu Jiancheng ◽  
Liang Guoxing
Keyword(s):  
Mathematical Model ◽  
Experimental Research ◽  
Surface Finish ◽  
Fem Analysis ◽  
Theoretical Method ◽  
Parameter Determination ◽  
Design Parameters ◽  
Ultrasonic Assisted ◽  
Low Efficiency

Honing process is widely used to improve the surface finish of hardened gears. The existing challenging for this manufacturing process includes its low efficiency and excessive forces exerted on both of engaged gears and tools. Ultrasonic assisted honing has a number of superior advantages over the traditional methods. This paper presents a new theoretical method for the parameter determination of non-resonant gear transformer, which is the key component of ultrasonic assisted honing systems. A mathematical model for the ultrasonic assisted honing system is first established and solved with different design parameters by using the numerical method. The numerated results then are verified by the FEM analysis and experiments. It is found that the proposed method is effective and useful. The details will be addressed in the paper.

scholarly journals SIMULATION OF COMPACT POLARIZERS FOR SATELLITE TELECOMMUNICATION SYSTEMS WITH THE ACCOUNT OF THICKNESS OF IRISES

2021 ◽  
Author(s):  
Stepan Piltyay
Keyword(s):  
Mathematical Model ◽  
Design Parameters ◽  
Matrix Elements ◽  
Satellite Telecommunication ◽  
Telecommunication Systems ◽  
Satellite Télécommunication ◽  
Scattering Wave ◽  
The Matrix ◽  
Electromagnetic Characteristics ◽  
Ku Band

Background. One of the main problems in modern satellite telecommunication systems is to increase the volume of information transmission with simultaneous preservation of its quality. Key element of such systems is antenna systems with polarization processing, which is carried out using polarizers. Therefore, development of new polarizers and simple techniques for their analysis and optimization are important problems. The most simple, effective, technological and actual for analysis are polarizers based on waveguides with irises.Objective. The purpose of the paper is to create a mathematical model of the polarizer based on a square waveguide with irises, which allows analyzing the influence of polarizer’s design parameters on its electromagnetic characteristics.Methods. A mathematical model of the waveguide polarizer with irises is created by decomposition technique using transfer and scattering wave matrices. To take into account the irises’ thickness their equivalent T- and Π-shaped circuits were used.Results. We have developed mathematical model of the waveguide polarizer with irises, which takes into account their thickness and is based on the complete scattering wave matrix of the waveguide polarizer. The matrix has been obtained using the microwave circuit theory. The main characteristics of the waveguide polarizer were defined using matrix elements. The optimization of characteristics of a polarizer was carried out in the operating Ku-band 10.7–12.8 GHz.Conclusions. Suggested mathematical model of a waveguide polarizer with irises provides the account of heights of irises, distances between them and their thickness. The results obtained show that this model is simpler and faster for the calculation of electromagnetic characteristics compared to finite elements method, which is often used for analysis of microwave devices for various applications.

scholarly journals Post-iris waveguide polarizer

2021 ◽  
Author(s):  
Stepan Piltyay
Keyword(s):  
Phase Shift ◽  
Axial Ratio ◽  
Differential Phase Shift ◽  
Differential Phase ◽  
Polarization Characteristics ◽  
Iris Waveguide

The developed device has the following matching and polarization characteristics. The range of change of the differential phase shift is 90°±2.2°. The polarizer provides VSWR less than 1.29. Axial ratio is less than 0.4 dB. XPD is higher than 29 dB.

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