2018 2nd URSI Atlantic Radio Science Meeting (AT-RASC), 2018
In this article, a nonlinear continuum damage mechanics(CDM) model is developed to assess the low... more In this article, a nonlinear continuum damage mechanics(CDM) model is developed to assess the low cycle fatigue damage of a steam turbine rotor. Two simulation experiments are carried out to introduce theory of CDM. First one makes an effective validation of its serviceability in thermal engineering, and the second one calculates the low cycle fatigue damage on the rotor of a domestic 300 MW steam turbine unit. Based on the relation of the cyclic stress-strain, a conservative character of present continuum damage mechanics model is exhibited. The calculation results are compared with those of the linear accumulation model, thermal entropy model and practical test data. Comparison results indicates that present nonlinear CDM model is able to describe the damage accumulation of turbine rotor more precisely and reasonably in practical thermal engineering.
This paper proposes a cyclostationary based approach to power analysis carried out for electric c... more This paper proposes a cyclostationary based approach to power analysis carried out for electric circuits under arbitrary periodic excitation. Instantaneous power is considered to be a particular case of the two-dimensional cross correlation function (CCF) of the voltage across, and current through, an element in the electric circuit. The cyclostationary notation is used for deriving the frequency domain counterpart of CCF—voltage–current cross spectrum correlation function (CSCF). Not only does the latter exhibit the complete representation of voltage–current interaction in the element, but it can be systematically exploited for evaluating all commonly used power measures, including instantaneous power, in the form of Fourier series expansion. Simulation examples, which are given for the parallel resonant circuit excited by the periodic currents expressed as a finite sum of sinusoids and periodic train of pulses with distorted edges, numerically illustrate the components of voltage–...
2019 International Symposium on Electromagnetic Compatibility - EMC EUROPE
In this paper the analytical time-domain propagator for stochastic electromagnetic field is propo... more In this paper the analytical time-domain propagator for stochastic electromagnetic field is proposed. The two-dimensional auto-correlation function and cyclic auto-correlation function can be efficiently used for the far-field characterization of the printed circuit board (PCB) stochastic radiated emission in the time-domain. The calculated cyclic characteristics using the convolution transformation and the far-field antenna measurements are compared. The validation of the obtained characteristics is demonstrated using normalized impulse antenna response.
2019 IEEE-APS Topical Conference on Antennas and Propagation in Wireless Communications (APWC)
The DOA estimation based on the Cyclic MUSIC, Extended Cyclic MUSIC and their parameterization wi... more The DOA estimation based on the Cyclic MUSIC, Extended Cyclic MUSIC and their parameterization with the Root-Music approaches is introduced for the communication signals with digital modulation, exhibit the cyclostationary properties. The experimental investigation of the discussed approaches is presented for difficult indoor scenarios include the multipath SOI propagation and powerful in-band interferences.
2021 United States National Committee of URSI National Radio Science Meeting (USNC-URSI NRSM), 2021
Printed circuit boards (PCBs) are a source of radiated electromagnetic interference (EMI). Signal... more Printed circuit boards (PCBs) are a source of radiated electromagnetic interference (EMI). Signal data transfer occurring on digital circuits can be considered in EMI modeling as a random process with cyclostationary properties. Electromagnetic fields originating from random or quasi-random source processes with stationary Gaussian probability distribution can be characterized by field-field correlations. For cyclostationary processes, the analysis procedure needs to be extended. In this contribution, we discuss the exposure of cycostationarity in the context of near field correlation analysis.
This paper presents an approach to estimating delays of the cyclostationary signal propagating th... more This paper presents an approach to estimating delays of the cyclostationary signal propagating through tracks of the data bus of a printed circuit board (PCB). The signal path is described by the series of delays estimated using cyclostationary characteristics in the frequency domain. A brief overview of cyclostationarity phenomena is given alongside with the designed practical algorithm performing wideband estimation of the spectral correlation density of the signal. Delay estimations obtained with the proposed approach based on cyclic spectral correlation function are much closer to the values evaluated geometrically on planar scheme than delays calculated by means of well-known generalized cross-correlation algorithm (GCC). The proposed algorithm is verified by the results of experiments featuring FPGA board.
2021 15th International Conference on Advanced Technologies, Systems and Services in Telecommunications (TELSIKS), 2021
An accurate characterization of Gaussian stochastic electromagnetic (EM) fields can be achieved b... more An accurate characterization of Gaussian stochastic electromagnetic (EM) fields can be achieved by auto- and cross correlation spectra. Multiple probes are required in a measurement setup for obtaining these correlation data. As the amount of data collected in such a measurement can be substantial, principal component analysis (PCA) can be utilized to reduce the complexity in the subsequent data processing and also for separating statistically independent sources. In cyclostationary problems, cycle frequencies need to be identified before formation of the correlation spectra. PCA is applied by an eigenvalue decomposition of the correlation matrix. Singular value decomposition of a Hankel matrix formed from the observed signal vector yields an identification of cycle frequencies.
2021 IEEE International Joint EMC/SI/PI and EMC Europe Symposium, 2021
Theoretical and experimental evaluation of the cyclostationary random data transferring process c... more Theoretical and experimental evaluation of the cyclostationary random data transferring process corrupted by the individually and jointly cyclostationary crosstalk interference added by stationary noise with possible deterministic component of the synchronizing clock signal is presented. The interference and the message signals were measured by the real time digital oscilloscope and autocorrelation functions were evaluated by synchronous cyclic averaging procedure. The analyzed periodic two-dimensional impulse response of the time-varying filter allows to obtain the output random process with the same cyclic frequency at the output of the filter by separation of orthogonal stationary waveforms constituting the input cyclostationary random process (CSRP). The filtering of the observed measured random process was implemented by cyclic Wiener filter, estimating the message from the measured random signal. The evaluation of two-dimensional autocorrelation function and eye diagrams at the output of the cyclic filter showed significant reduction of the independent interference components in the estimated message signal.
2016 International Symposium on Electromagnetic Compatibility - EMC EUROPE, 2016
In this paper a 2D parametric identification algorithm of stochastic electromagnetic interference... more In this paper a 2D parametric identification algorithm of stochastic electromagnetic interference (EMI) sources based on near-field measurements is presented. The unintentional radiation of electronic devices and connecting cables can be measured by using two-point near-field planar scanning probes connected to the digital oscilloscope for ultra-wideband (UWB) time-domain data recording. The characterization of the registered stochastic time-domain field distribution was implemented by evaluating the autocorrelation and cross-correlation spectra. Due to the cyclostationary property of the stochastic information signals, the ensemble averaging procedure allows evaluating amplitudes and initial phases of clock harmonics, used for the synchronization of electronic device and information transmitting through the cables. The radiating object could be modelled as a set of equivalent electrical dipoles arranged on a grid in the object plane. To determine the equivalent dipole moments, the inverse procedure for the estimated clock harmonic was realized assuming the near-field propagation model. The final localization of the equivalent dipoles for the defined clock harmonic was implemented by the application of 2D Matrix Pencil algorithm and Minimum Least Square fitting procedure. The experimental data was processed with proposed parametric identification procedure for a spatial localization of equivalent dipoles and effective sources on the surface of the radiating structure.
2016 46th European Microwave Conference (EuMC), 2016
In this paper, we present experimental characterization and analysis of radiated emissions from c... more In this paper, we present experimental characterization and analysis of radiated emissions from coupled UAV and smart RFIC Objects (smartphones) in presence of noisy interferers. Spectral and spatial Near-Field responses of radiated emissions from coupled Motor (UAV) and Circuit (smartphones) are extracted. Analysis of radiated emissions based on Energy density and Entropy considerations are proposed. Wavelet Multi-Resolution approach is introduced for the simultaneous Time-Frequency identification and localization of stochastic noisy sources.
2007 International Conference on Electromagnetics in Advanced Applications, 2007
In this paper we present the time domain computation of the impulse response of optimized antenna... more In this paper we present the time domain computation of the impulse response of optimized antenna structures using the transmission line matrix TLM method. Hybrid extensions based on system identification (SI) are a means to reduce the computational burden considerably. Model-based SI procedures can be used to represent complex electromagnetic structures by means of both lumped element networks and distributed parameters models.
2006 International Conference on Microwaves, Radar & Wireless Communications, 2006
The network oriented representation of the 3-D electromagnetic structures is based on two types o... more The network oriented representation of the 3-D electromagnetic structures is based on two types of linear systems. The former one is a dynamic linear system which describes the interaction of electric and magnetic fields inside the structure while the latter one is a linear system consisting of delay lines meant for the reflection and propagation. The system identification of the linear dynamic system needs the estimation of the poles positions and the maximum duration of the delays of complementary linear system. The improved system identification scheme based on poles set stability criterion is introduced. This scheme offers to divide the restored impulse response into the finite duration entire part and the infinite pole part which pertain to the each linear system correspondingly. The simulation results of the model parameter estimation for the two-port coplanar resonator are demonstrated.
2014 International Symposium on Electromagnetic Compatibility, 2014
In this paper a 2D stochastic EMI sources identification algorithm based on two-point time-domain... more In this paper a 2D stochastic EMI sources identification algorithm based on two-point time-domain scanning of electromagnetic near-field tangential components is presented. The radiating structure is considered as a set of simple electrical dipoles arranged on a grid in object plane. The autocorrelation and cross-correlation spectra are used for the characterization of stochastic field distribution. These characteristics are used to determine the distribution of dipole moments and to estimate the parameters of the real radiation sources. Typical cases of mutual uncorrelated sources and fully correlated sources are discussed as well as the modeling results. The experimental data was processed with proposed parametric identification procedure for a spatial localization of equivalent dipoles and effective sources inside the structure.
2018 2nd URSI Atlantic Radio Science Meeting (AT-RASC), 2018
In this article, a nonlinear continuum damage mechanics(CDM) model is developed to assess the low... more In this article, a nonlinear continuum damage mechanics(CDM) model is developed to assess the low cycle fatigue damage of a steam turbine rotor. Two simulation experiments are carried out to introduce theory of CDM. First one makes an effective validation of its serviceability in thermal engineering, and the second one calculates the low cycle fatigue damage on the rotor of a domestic 300 MW steam turbine unit. Based on the relation of the cyclic stress-strain, a conservative character of present continuum damage mechanics model is exhibited. The calculation results are compared with those of the linear accumulation model, thermal entropy model and practical test data. Comparison results indicates that present nonlinear CDM model is able to describe the damage accumulation of turbine rotor more precisely and reasonably in practical thermal engineering.
This paper proposes a cyclostationary based approach to power analysis carried out for electric c... more This paper proposes a cyclostationary based approach to power analysis carried out for electric circuits under arbitrary periodic excitation. Instantaneous power is considered to be a particular case of the two-dimensional cross correlation function (CCF) of the voltage across, and current through, an element in the electric circuit. The cyclostationary notation is used for deriving the frequency domain counterpart of CCF—voltage–current cross spectrum correlation function (CSCF). Not only does the latter exhibit the complete representation of voltage–current interaction in the element, but it can be systematically exploited for evaluating all commonly used power measures, including instantaneous power, in the form of Fourier series expansion. Simulation examples, which are given for the parallel resonant circuit excited by the periodic currents expressed as a finite sum of sinusoids and periodic train of pulses with distorted edges, numerically illustrate the components of voltage–...
2019 International Symposium on Electromagnetic Compatibility - EMC EUROPE
In this paper the analytical time-domain propagator for stochastic electromagnetic field is propo... more In this paper the analytical time-domain propagator for stochastic electromagnetic field is proposed. The two-dimensional auto-correlation function and cyclic auto-correlation function can be efficiently used for the far-field characterization of the printed circuit board (PCB) stochastic radiated emission in the time-domain. The calculated cyclic characteristics using the convolution transformation and the far-field antenna measurements are compared. The validation of the obtained characteristics is demonstrated using normalized impulse antenna response.
2019 IEEE-APS Topical Conference on Antennas and Propagation in Wireless Communications (APWC)
The DOA estimation based on the Cyclic MUSIC, Extended Cyclic MUSIC and their parameterization wi... more The DOA estimation based on the Cyclic MUSIC, Extended Cyclic MUSIC and their parameterization with the Root-Music approaches is introduced for the communication signals with digital modulation, exhibit the cyclostationary properties. The experimental investigation of the discussed approaches is presented for difficult indoor scenarios include the multipath SOI propagation and powerful in-band interferences.
2021 United States National Committee of URSI National Radio Science Meeting (USNC-URSI NRSM), 2021
Printed circuit boards (PCBs) are a source of radiated electromagnetic interference (EMI). Signal... more Printed circuit boards (PCBs) are a source of radiated electromagnetic interference (EMI). Signal data transfer occurring on digital circuits can be considered in EMI modeling as a random process with cyclostationary properties. Electromagnetic fields originating from random or quasi-random source processes with stationary Gaussian probability distribution can be characterized by field-field correlations. For cyclostationary processes, the analysis procedure needs to be extended. In this contribution, we discuss the exposure of cycostationarity in the context of near field correlation analysis.
This paper presents an approach to estimating delays of the cyclostationary signal propagating th... more This paper presents an approach to estimating delays of the cyclostationary signal propagating through tracks of the data bus of a printed circuit board (PCB). The signal path is described by the series of delays estimated using cyclostationary characteristics in the frequency domain. A brief overview of cyclostationarity phenomena is given alongside with the designed practical algorithm performing wideband estimation of the spectral correlation density of the signal. Delay estimations obtained with the proposed approach based on cyclic spectral correlation function are much closer to the values evaluated geometrically on planar scheme than delays calculated by means of well-known generalized cross-correlation algorithm (GCC). The proposed algorithm is verified by the results of experiments featuring FPGA board.
2021 15th International Conference on Advanced Technologies, Systems and Services in Telecommunications (TELSIKS), 2021
An accurate characterization of Gaussian stochastic electromagnetic (EM) fields can be achieved b... more An accurate characterization of Gaussian stochastic electromagnetic (EM) fields can be achieved by auto- and cross correlation spectra. Multiple probes are required in a measurement setup for obtaining these correlation data. As the amount of data collected in such a measurement can be substantial, principal component analysis (PCA) can be utilized to reduce the complexity in the subsequent data processing and also for separating statistically independent sources. In cyclostationary problems, cycle frequencies need to be identified before formation of the correlation spectra. PCA is applied by an eigenvalue decomposition of the correlation matrix. Singular value decomposition of a Hankel matrix formed from the observed signal vector yields an identification of cycle frequencies.
2021 IEEE International Joint EMC/SI/PI and EMC Europe Symposium, 2021
Theoretical and experimental evaluation of the cyclostationary random data transferring process c... more Theoretical and experimental evaluation of the cyclostationary random data transferring process corrupted by the individually and jointly cyclostationary crosstalk interference added by stationary noise with possible deterministic component of the synchronizing clock signal is presented. The interference and the message signals were measured by the real time digital oscilloscope and autocorrelation functions were evaluated by synchronous cyclic averaging procedure. The analyzed periodic two-dimensional impulse response of the time-varying filter allows to obtain the output random process with the same cyclic frequency at the output of the filter by separation of orthogonal stationary waveforms constituting the input cyclostationary random process (CSRP). The filtering of the observed measured random process was implemented by cyclic Wiener filter, estimating the message from the measured random signal. The evaluation of two-dimensional autocorrelation function and eye diagrams at the output of the cyclic filter showed significant reduction of the independent interference components in the estimated message signal.
2016 International Symposium on Electromagnetic Compatibility - EMC EUROPE, 2016
In this paper a 2D parametric identification algorithm of stochastic electromagnetic interference... more In this paper a 2D parametric identification algorithm of stochastic electromagnetic interference (EMI) sources based on near-field measurements is presented. The unintentional radiation of electronic devices and connecting cables can be measured by using two-point near-field planar scanning probes connected to the digital oscilloscope for ultra-wideband (UWB) time-domain data recording. The characterization of the registered stochastic time-domain field distribution was implemented by evaluating the autocorrelation and cross-correlation spectra. Due to the cyclostationary property of the stochastic information signals, the ensemble averaging procedure allows evaluating amplitudes and initial phases of clock harmonics, used for the synchronization of electronic device and information transmitting through the cables. The radiating object could be modelled as a set of equivalent electrical dipoles arranged on a grid in the object plane. To determine the equivalent dipole moments, the inverse procedure for the estimated clock harmonic was realized assuming the near-field propagation model. The final localization of the equivalent dipoles for the defined clock harmonic was implemented by the application of 2D Matrix Pencil algorithm and Minimum Least Square fitting procedure. The experimental data was processed with proposed parametric identification procedure for a spatial localization of equivalent dipoles and effective sources on the surface of the radiating structure.
2016 46th European Microwave Conference (EuMC), 2016
In this paper, we present experimental characterization and analysis of radiated emissions from c... more In this paper, we present experimental characterization and analysis of radiated emissions from coupled UAV and smart RFIC Objects (smartphones) in presence of noisy interferers. Spectral and spatial Near-Field responses of radiated emissions from coupled Motor (UAV) and Circuit (smartphones) are extracted. Analysis of radiated emissions based on Energy density and Entropy considerations are proposed. Wavelet Multi-Resolution approach is introduced for the simultaneous Time-Frequency identification and localization of stochastic noisy sources.
2007 International Conference on Electromagnetics in Advanced Applications, 2007
In this paper we present the time domain computation of the impulse response of optimized antenna... more In this paper we present the time domain computation of the impulse response of optimized antenna structures using the transmission line matrix TLM method. Hybrid extensions based on system identification (SI) are a means to reduce the computational burden considerably. Model-based SI procedures can be used to represent complex electromagnetic structures by means of both lumped element networks and distributed parameters models.
2006 International Conference on Microwaves, Radar & Wireless Communications, 2006
The network oriented representation of the 3-D electromagnetic structures is based on two types o... more The network oriented representation of the 3-D electromagnetic structures is based on two types of linear systems. The former one is a dynamic linear system which describes the interaction of electric and magnetic fields inside the structure while the latter one is a linear system consisting of delay lines meant for the reflection and propagation. The system identification of the linear dynamic system needs the estimation of the poles positions and the maximum duration of the delays of complementary linear system. The improved system identification scheme based on poles set stability criterion is introduced. This scheme offers to divide the restored impulse response into the finite duration entire part and the infinite pole part which pertain to the each linear system correspondingly. The simulation results of the model parameter estimation for the two-port coplanar resonator are demonstrated.
2014 International Symposium on Electromagnetic Compatibility, 2014
In this paper a 2D stochastic EMI sources identification algorithm based on two-point time-domain... more In this paper a 2D stochastic EMI sources identification algorithm based on two-point time-domain scanning of electromagnetic near-field tangential components is presented. The radiating structure is considered as a set of simple electrical dipoles arranged on a grid in object plane. The autocorrelation and cross-correlation spectra are used for the characterization of stochastic field distribution. These characteristics are used to determine the distribution of dipole moments and to estimate the parameters of the real radiation sources. Typical cases of mutual uncorrelated sources and fully correlated sources are discussed as well as the modeling results. The experimental data was processed with proposed parametric identification procedure for a spatial localization of equivalent dipoles and effective sources inside the structure.
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Papers by Yury Kuznetsov