Pub Date : 2018-09-01DOI: 10.1109/DIPED.2018.8543262
T. Solyar
A method for determining transient and set dynamic stresses that arise near the crack system in elastic bodies under out-of-plane deformation is developed. The method is based on an integral Laplace transform, modified Prudnikov model for its inversion, methods of boundary integral equations and minimization of corresponding criterion functions. Typical peculiarities of the stress intensity factors variation for one crack and a system of cracks at the stage of achieving by oscillations the steady-state condition are established.
{"title":"Investigation of the Crack’s Effect on SH-Waves Propagation Based on the Regularized Formula of Inverse Laplace Transform","authors":"T. Solyar","doi":"10.1109/DIPED.2018.8543262","DOIUrl":"https://doi.org/10.1109/DIPED.2018.8543262","url":null,"abstract":"A method for determining transient and set dynamic stresses that arise near the crack system in elastic bodies under out-of-plane deformation is developed. The method is based on an integral Laplace transform, modified Prudnikov model for its inversion, methods of boundary integral equations and minimization of corresponding criterion functions. Typical peculiarities of the stress intensity factors variation for one crack and a system of cracks at the stage of achieving by oscillations the steady-state condition are established.","PeriodicalId":146873,"journal":{"name":"2018 XXIIIrd International Seminar/Workshop on Direct and Inverse Problems of Electromagnetic and Acoustic Wave Theory (DIPED)","volume":"43 2","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131922307","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-09-01DOI: 10.1109/DIPED.2018.8543263
Y. Penkin, V. Katrich, M. Nesterenko, S. Berdnik
A generalized formulation of integral equations for currents in electrically thin radiators of electric and magnetic type satisfying the principle of permutational duality is offered. The methodological feature of the approach is based on a concept of effective induced impedances of electric and magnetic types, which is used for solutions of boundary value problems. Such alternative representation of the integral equations makes it possible to combine solution methods known for electrically thin vibrators and slot antennas based on a single methodology.
{"title":"Dual-Symmetric Form of Integral Equations for Antenna Currents","authors":"Y. Penkin, V. Katrich, M. Nesterenko, S. Berdnik","doi":"10.1109/DIPED.2018.8543263","DOIUrl":"https://doi.org/10.1109/DIPED.2018.8543263","url":null,"abstract":"A generalized formulation of integral equations for currents in electrically thin radiators of electric and magnetic type satisfying the principle of permutational duality is offered. The methodological feature of the approach is based on a concept of effective induced impedances of electric and magnetic types, which is used for solutions of boundary value problems. Such alternative representation of the integral equations makes it possible to combine solution methods known for electrically thin vibrators and slot antennas based on a single methodology.","PeriodicalId":146873,"journal":{"name":"2018 XXIIIrd International Seminar/Workshop on Direct and Inverse Problems of Electromagnetic and Acoustic Wave Theory (DIPED)","volume":"41 5","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131726257","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-09-01DOI: 10.1109/DIPED.2018.8543298
P. Savenko
Studies of a nonlinear synthesis problem for plane equidistant array by the prescribed amplitude directivity pattern (DP) are presented. A characteristic feature of problems of this class is the non-uniqueness and branching of solutions depending on the physical parameters of array. The existence of several types of real solutions is shown. More effective complex solutions branch off from such solutions. The methods of finding the curves of branching the solutions and the numerical algorithms to search the optimal synthesized amplitude DPs are presented.
{"title":"The Nonuniquness of Solutions to the Synthesis Problems of Plane Array by the Prescribed Amplitude Directivity Pattern","authors":"P. Savenko","doi":"10.1109/DIPED.2018.8543298","DOIUrl":"https://doi.org/10.1109/DIPED.2018.8543298","url":null,"abstract":"Studies of a nonlinear synthesis problem for plane equidistant array by the prescribed amplitude directivity pattern (DP) are presented. A characteristic feature of problems of this class is the non-uniqueness and branching of solutions depending on the physical parameters of array. The existence of several types of real solutions is shown. More effective complex solutions branch off from such solutions. The methods of finding the curves of branching the solutions and the numerical algorithms to search the optimal synthesized amplitude DPs are presented.","PeriodicalId":146873,"journal":{"name":"2018 XXIIIrd International Seminar/Workshop on Direct and Inverse Problems of Electromagnetic and Acoustic Wave Theory (DIPED)","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123879534","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-09-01DOI: 10.1109/DIPED.2018.8543279
D. Natarov
We consider a source-free problem of the H-polarized field in the presence of a finite grating made of quantum nanowires. In the analysis, we use mathematically grounded Lasing Eigenvalue Problem formalism, according to which at the threshold the natural-mode frequency is considered real-valued. We look for it as a part of two-component eigenvalue, together with the corresponding threshold value of material gain in the quantum wires. To build characteristic equation, we use the field expansions in local coordinates of each wire and addition theorems for cylindrical functions. The obtained determinantal equation has a guaranteed convergence. We find grating modes of such laser with the lowest threshold values, and study the dependences of modal thresholds and wavelengths on the various parameters of the grating.
{"title":"Analysis of Eigenmodes of Laser Based on Finite Quantum Nanowire Grating","authors":"D. Natarov","doi":"10.1109/DIPED.2018.8543279","DOIUrl":"https://doi.org/10.1109/DIPED.2018.8543279","url":null,"abstract":"We consider a source-free problem of the H-polarized field in the presence of a finite grating made of quantum nanowires. In the analysis, we use mathematically grounded Lasing Eigenvalue Problem formalism, according to which at the threshold the natural-mode frequency is considered real-valued. We look for it as a part of two-component eigenvalue, together with the corresponding threshold value of material gain in the quantum wires. To build characteristic equation, we use the field expansions in local coordinates of each wire and addition theorems for cylindrical functions. The obtained determinantal equation has a guaranteed convergence. We find grating modes of such laser with the lowest threshold values, and study the dependences of modal thresholds and wavelengths on the various parameters of the grating.","PeriodicalId":146873,"journal":{"name":"2018 XXIIIrd International Seminar/Workshop on Direct and Inverse Problems of Electromagnetic and Acoustic Wave Theory (DIPED)","volume":"112 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127977436","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-09-01DOI: 10.1109/diped.2018.8543128
{"title":"[Blank page]","authors":"","doi":"10.1109/diped.2018.8543128","DOIUrl":"https://doi.org/10.1109/diped.2018.8543128","url":null,"abstract":"","PeriodicalId":146873,"journal":{"name":"2018 XXIIIrd International Seminar/Workshop on Direct and Inverse Problems of Electromagnetic and Acoustic Wave Theory (DIPED)","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115381386","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-09-01DOI: 10.1109/DIPED.2018.8543129
I. Petoev, V. Tabatadze, R. Zaridze, S. Invia
The Method of Auxiliary Sources MAS) used for the 2D scattered electromagnetic field analytical continuation’s singularities distribution and character determination.Smooth bounded perfect cylindrical conductor surface is considered as a scatterer. The idea of the MAS application for this problem related to the holography principle and is based on the properties of field’s analyticity and uniqueness of its analytical continuation up to the singularities. After the theoretical foundations of the problem, several results of numerical experiments are presented.
{"title":"Localization of the Scattered Field’s Singularities Using the Method of Auxiliary Sources","authors":"I. Petoev, V. Tabatadze, R. Zaridze, S. Invia","doi":"10.1109/DIPED.2018.8543129","DOIUrl":"https://doi.org/10.1109/DIPED.2018.8543129","url":null,"abstract":"The Method of Auxiliary Sources MAS) used for the 2D scattered electromagnetic field analytical continuation’s singularities distribution and character determination.Smooth bounded perfect cylindrical conductor surface is considered as a scatterer. The idea of the MAS application for this problem related to the holography principle and is based on the properties of field’s analyticity and uniqueness of its analytical continuation up to the singularities. After the theoretical foundations of the problem, several results of numerical experiments are presented.","PeriodicalId":146873,"journal":{"name":"2018 XXIIIrd International Seminar/Workshop on Direct and Inverse Problems of Electromagnetic and Acoustic Wave Theory (DIPED)","volume":"103 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115753724","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-09-01DOI: 10.1109/diped.2018.8543291
{"title":"[Blank page]","authors":"","doi":"10.1109/diped.2018.8543291","DOIUrl":"https://doi.org/10.1109/diped.2018.8543291","url":null,"abstract":"","PeriodicalId":146873,"journal":{"name":"2018 XXIIIrd International Seminar/Workshop on Direct and Inverse Problems of Electromagnetic and Acoustic Wave Theory (DIPED)","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128205782","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-09-01DOI: 10.1109/DIPED.2018.8543284
M. Andreev, V. Borulko, O. Drobakhin
Analytical expressions for pulse signal reflected by traditional Bragg-type layered structures are obtained. The expressions for characteristic polynomial are calculated. The influence of the number of layers in the structure and contrast of permittivity on the form of pulse is studied. The analysis is done in the comparison with properties of the structure in frequency domain including behavior of zeros of frequency characteristic. The role of reverberations is revealed.
{"title":"Analysis of Pulse Signal Reflection in Bragg-Type Layered Structures","authors":"M. Andreev, V. Borulko, O. Drobakhin","doi":"10.1109/DIPED.2018.8543284","DOIUrl":"https://doi.org/10.1109/DIPED.2018.8543284","url":null,"abstract":"Analytical expressions for pulse signal reflected by traditional Bragg-type layered structures are obtained. The expressions for characteristic polynomial are calculated. The influence of the number of layers in the structure and contrast of permittivity on the form of pulse is studied. The analysis is done in the comparison with properties of the structure in frequency domain including behavior of zeros of frequency characteristic. The role of reverberations is revealed.","PeriodicalId":146873,"journal":{"name":"2018 XXIIIrd International Seminar/Workshop on Direct and Inverse Problems of Electromagnetic and Acoustic Wave Theory (DIPED)","volume":"47 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128287739","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-09-01DOI: 10.1109/DIPED.2018.8543297
E. Gevorkyan
This article provides a review of theoretical works devoted to the study of transient radiation and Cherenkov radiation of a charged particle at its uniform motion in perpendicular direction to the waveguide axis. It is assumed that the waveguide fully and partially filled with an anisotropic magnetodielectric medium. Wave equations and analytical expressions for transverse electric (TE) and transverse magnetic (TM) fields both in the waveguide and in various regions of the waveguide in the presence of a plate of finite length in it have been found. Energies of transient radiation of the particle moving in a rectangular waveguide have been calculated. In this case the peculiarities of transient radiation and Cherenkov radiation have been analyzed.
{"title":"Transient Radiation of Charged Particle in a Waveguide Completely and Partially Filled with an Anisotropic Magnetodielectric Medium","authors":"E. Gevorkyan","doi":"10.1109/DIPED.2018.8543297","DOIUrl":"https://doi.org/10.1109/DIPED.2018.8543297","url":null,"abstract":"This article provides a review of theoretical works devoted to the study of transient radiation and Cherenkov radiation of a charged particle at its uniform motion in perpendicular direction to the waveguide axis. It is assumed that the waveguide fully and partially filled with an anisotropic magnetodielectric medium. Wave equations and analytical expressions for transverse electric (TE) and transverse magnetic (TM) fields both in the waveguide and in various regions of the waveguide in the presence of a plate of finite length in it have been found. Energies of transient radiation of the particle moving in a rectangular waveguide have been calculated. In this case the peculiarities of transient radiation and Cherenkov radiation have been analyzed.","PeriodicalId":146873,"journal":{"name":"2018 XXIIIrd International Seminar/Workshop on Direct and Inverse Problems of Electromagnetic and Acoustic Wave Theory (DIPED)","volume":"87 2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128947955","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-09-01DOI: 10.1109/DIPED.2018.8543319
D. Eremyan, A. Gheonjian, Davit Imnadze, Z. Kutchadze, M. Oragvelidze, R. Jobava, Heia Ben Htira
In this paper several methodologies for the modelling of EMC filter are presented. Modeling of the filter can be done at the circuit level or at 3D field level with full-wave Method of Moments (MoM). On first step RF components of filter are modeled based on calculated or measured s-parameters. Circuit level model can be enhanced by including stray RLC parameters of the PCB traces calculated with 3D quasi-static/quasi-magnetic approach. Filter attenuation is calculated for common and differential modes using different methods in the frequency range from 10 kHz up to 50 MHz and are compared with measurements.
{"title":"Modeling and Validation of the Basic EMC Filter at Different Simulation Levels","authors":"D. Eremyan, A. Gheonjian, Davit Imnadze, Z. Kutchadze, M. Oragvelidze, R. Jobava, Heia Ben Htira","doi":"10.1109/DIPED.2018.8543319","DOIUrl":"https://doi.org/10.1109/DIPED.2018.8543319","url":null,"abstract":"In this paper several methodologies for the modelling of EMC filter are presented. Modeling of the filter can be done at the circuit level or at 3D field level with full-wave Method of Moments (MoM). On first step RF components of filter are modeled based on calculated or measured s-parameters. Circuit level model can be enhanced by including stray RLC parameters of the PCB traces calculated with 3D quasi-static/quasi-magnetic approach. Filter attenuation is calculated for common and differential modes using different methods in the frequency range from 10 kHz up to 50 MHz and are compared with measurements.","PeriodicalId":146873,"journal":{"name":"2018 XXIIIrd International Seminar/Workshop on Direct and Inverse Problems of Electromagnetic and Acoustic Wave Theory (DIPED)","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117116151","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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