EMCoS Ltd.

Tbilisi, Georgia

EMCoS Ltd.

Tbilisi, Georgia
SEARCH FILTERS
Time filter
Source Type

Bogdanov F.,EMCoS Ltd. | Bogdanov F.,Georgian Technical University | Jobava R.,EMCoS Ltd. | Jobava R.,Tbilisi State University | Bzhalava A.,EMCoS Ltd.
8th European Conference on Antennas and Propagation, EuCAP 2014 | Year: 2014

In this paper, a conventional loop-star approach is generalized on mixed multiple geometries composed of metal surfaces, wires, dielectrics and thin material sheets. A hybridized MoM solver to jointly handle these geometry elements is developed and applied for analysis of specific electromagnetic (EM), electromagnetic interference (EMI), compatibility (EMC) and safety (EMS) problems. The developed approach is validated by comparison of simulated results for particular geometries with those obtained by other approaches. Application of it to practical EMC and EMS problems, such as inductive charging in electrical and hybrid vehicles (EV and HV), is demonstrated. © 2014 European Association on Antennas and Propagation.


Bogdanov F.,EMCoS Ltd. | Bogdanov F.,Georgian Technical University | Jobava R.,EMCoS Ltd. | Jobava R.,Tbilisi State University | And 3 more authors.
Proceedings of 6th European Conference on Antennas and Propagation, EuCAP 2012 | Year: 2012

In this work, the loop-star and loop-tree basis function approach is applied to multiple, complicated and mixed surface and wire geometries, including a number of separate surfaces (open and close), with handles and holes, a number of wires (open and looped) and surface to wire junctions, being in free space, over ground plane or over/in a layered medium. This approach is also extended to considering printed structures by modifying the hybrid MoM and multilayered Green's function approach. © 2012 IEEE.


Bogdanov F.G.,EMCoS Ltd. | Bogdanov F.G.,Georgian Technical University | Karkashadze D.D.,EMCoS Ltd. | Karkashadze D.D.,Tbilisi State University | And 9 more authors.
IEEE Transactions on Electromagnetic Compatibility | Year: 2010

In this paper, based on the refined modified image theory, an equivalent model of the layered glass antenna structure is suggested and validated by comparison with Sommerfelds traditional solution to Greens function. Using this model, a hybrid method of moments (MoM) scheme is derived to handle the full MoM geometries including finite-sized and curved glass antenna structures. This scheme is validated by comparison of the measured and simulated electromagnetic compatibility (EMC) characteristics of the special simplified models and a full vehicle model with a realistic rear window glass antenna. © 2010 IEEE.


Bogdanov F.,EMCoS Ltd. | Bogdanov F.,Georgian Technical University | Jobava R.,EMCoS Ltd. | Jobava R.,Tbilisi State University | Chochia I.,EMCoS Ltd.
IEEE Antennas and Propagation Society, AP-S International Symposium (Digest) | Year: 2013

Surface impedance boundary conditions (SIBC) by Mitzner are implemented into the Method of Moments (MoM) to simulate arbitrary shape open thin 3D material sheets hybridized with wires and other geometry elements. This approach is validated by comparison of simulated results with analytical approaches and measurements. Application of the developed approach to automotive EMI problems is demonstrated. © 2013 IEEE.


Gabriadze G.,Tbilisi State University | Bodganov F.,Georgian Technical University | Tsereteli P.,The University of Georgia | Jobava R.,EMCoS Ltd. | Tskhovrebashvili V.,EMCoS Ltd.
Proceedings of International Seminar/Workshop on Direct and Inverse Problems of Electromagnetic and Acoustic Wave Theory, DIPED | Year: 2014

This paper describes the application of ACA (Adaptive Cross Approximation) algorithm for acceleration of MoM solution of large scale radiation problems. System of linear equations is solved using iterative solution and ACA is used to reduce required memory for matrix storage and speed up matrix-vector-product operation. To demonstrate applicability and performance of described technique, two numerical experiments are presented: a) calculation of radiation pattern of Magellan spacecraft high gain reflector antenna operating at 3GHz and b) calculation of radiation pattern of Wi-Fi antenna mounted on the roof of the vehicle, operating at 5.9GHz frequency. We show that ACA calculation is much faster than direct solution, while accuracy is quite acceptable. © 2014 IEEE.


Oganezova I.,EMCoS Ltd. | Oganezova I.,Tbilisi State University | Shen G.,Missouri University of Science and Technology | Yang S.,Missouri University of Science and Technology | And 3 more authors.
IEEE International Symposium on Electromagnetic Compatibility | Year: 2016

ESD events can damage or upset electronic vehicle systems, so discharges to the electronic systems or to the attached cables need to be considered. Discharges to the cables or to coupling structures close to the cables were investigated and a Method of Moments (MoM)-based methodology for ESD simulation is proposed. The simulation results for test benches according to ISO standards were verified against measurements. © 2016 IEEE.


Oganezova I.,EMCoS Ltd. | Oganezova I.,Tbilisi State University | Kado R.,Chrysler Group LLC | Khvitia B.,EMCoS Ltd. | And 4 more authors.
IEEE International Symposium on Electromagnetic Compatibility | Year: 2016

In this paper, an accurate and fast scheme for generation of BCI test setup is proposed. The method is used for study of vehicle lighting system under BCI test according to ISO 11452-4 standard. The Rear Combination Lamp module is examined and input voltages obtained during BCI test are compared with predefined susceptibility limits. © 2016 IEEE.


Oganezova I.,EMCoS Ltd. | Oganezova I.,Tbilisi State University | Kado R.,Chrysler Group LLC | Khvitia B.,EMCoS Ltd. | And 5 more authors.
IEEE International Symposium on Electromagnetic Compatibility | Year: 2014

This paper proposes a high-frequency dynamic circuit network model of a DC motor for predicting conductive emissions in low-voltage automotive applications, and discusses a study in which this model was examined. The proposed model, which is based on a behavioral approach, introduces some physical features and phenomena of motor armature windings. Together with impedance characterization current model gives possibility to perform accurate transient analysis and describe complex commutation processes in motor during rotation. © 2014 IEEE.


Jobava R.,EMCoS Ltd. | Jobava R.,Tbilisi State University | Tsereteli P.,EMCoS Ltd. | Tsereteli P.,Tbilisi State University | Odisharia K.,EMCoS Ltd.
DIPED - 2011: 2011 16th International Seminar/Workshop on Direct and Inverse Problems of Electromagnetic and Acoustic Wave Theory, Proceedings | Year: 2011

The state-of-art computer architecture is based on multi core processor technology. Nowadays processors contain even more than ten cores. On the other hand new technologies have emerged that enable using GPU in general propose computing. Moreover, GPUs have become easier to program, which allows developers to effectively exploit their computational power. Currently, major chip manufacturers are developing next generation microprocessor designs that integrate multi core CPU and GPU components. Thus, it has become essential to develop algorithms that effectively use both, CPU and GPU opportunities. This paper describes one of that such hybrid GPU algorithms that is used in EMC problem solution. © 2011 Inst for Applied Problems.


Bogdanov F.,EMCoS Ltd. | Jobava R.,EMCoS Ltd. | Gheonjian A.,EMCoS Ltd. | Demurov A.,EMCoS Ltd. | And 2 more authors.
IEEE Antennas and Propagation Society, AP-S International Symposium (Digest) | Year: 2011

In this paper, the MOM hybridization with a special Green's function for printed elements and multiport network approach is applied to simulate the integrated printed circuit boards (PCB) and printed microstrip antennas (PMA). The simulation results are shown to be in very good agreement with measurements. Some predictions of electromagnetic behavior of ultra-wave band (UWB) PMA in a real car model will be done. © 2011 IEEE.

Loading EMCoS Ltd. collaborators
Loading EMCoS Ltd. collaborators