sergey dosko - Academia.edu (original) (raw)
Papers by sergey dosko
2020 International Conference Quality Management, Transport and Information Security, Information Technologies (IT&QM&IS), 2020
The article describes an approach of parametric spectral analysis application in apical seismocar... more The article describes an approach of parametric spectral analysis application in apical seismocardiography using an example of the precardiac zone oscillations analysis. Parameters of individual sections of the cardio cycle can be investigated in detail using the proposed approach, which allows one to form a more accurate diagnostic representation of the heartbeat phases within the cardio cycle. The analysis of changes in the seismocardiographic signals modal composition depending on the position of a person during acquisition carried out. The presence of significant changes in the modal composition of such signals, which can be used as an additional diagnostic criterion, is shown.
Quality. Innovation. Education, 2019
2017 International Conference "Quality Management,Transport and Information Security, Information Technologies" (IT&QM&IS), 2017
Mathematical models of a mechanical system in the time and frequency areas, which are realized by... more Mathematical models of a mechanical system in the time and frequency areas, which are realized by various software complexes, are considered. The results of identification of the experimental amplitude-frequency characteristic using the software complex IMS-I are presented. It is established that the design analysis method, in which one natural frequency (one mode) is considered does not provide the dynamic quality of the mechanical system, it is necessary to change the parameters for all available natural frequencies for analysis.
Quality. Innovation. Education, 2020
This article considers a review and analysis of modern methods of modal analysis of biomedical si... more This article considers a review and analysis of modern methods of modal analysis of biomedical signals using for biomedical-engineering data measuring systems. The results of the combined use of parametric and empirical methods to eliminate noise distortions arising from the registration of signals and to identify informative components of biomedical signals of various physical natures with the aim of analyzing their structure are presented. The results of visualization of the dynamics of changes in the modal parameters of the cardiocycles of the electrocardiogram and seismocardiogram are considered. The use of modal decomposition to evaluate regulatory processes in the analysis of heart rate variability is demonstrated.
Vestnik Mashinostroeniya, 2020
The results of studies of the dynamic properties of a turning tool cutter are considered, obtaine... more The results of studies of the dynamic properties of a turning tool cutter are considered, obtained using experimental modal analysis, in the arsenal of which there are several identification methods. For comparison, the results of four methods are given. Keywords: cutting processing, vibration, tool, dynamic properties, tool holder, experimental modal analysis. alexandrmolchanov@inbox.ru
Russian Engineering Research, 2019
The basic damping properties of composite lathe structures are analyzed by modal diagnostics. New... more The basic damping properties of composite lathe structures are analyzed by modal diagnostics. New experimental results and literature data from non-Russian research are employed. The damping properties of cast-iron and composite lathe structures are compared. The composites considered are ferrocement, polymer concrete, and metal concrete.
Bulletin of Bryansk state technical university, 2018
Рассмотрены возможности использования параметрического спектрального анализа (ПСА) для идентифика... more Рассмотрены возможности использования параметрического спектрального анализа (ПСА) для идентификации режима автоколебаний в станках, что позволит: выполнить без побочных эффектов спектральное оценивание сегментов временных рядов во временных окнах ограниченной продолжительности; использовать модель нестационарного временного ряда; определить собственный спектр частот и спектр модального демпфирования мод системы, проявившихся на данном сегменте временного ряда; получить аналитический спектр Фурье сигнала. Ключевые слова: параметрический спектральный анализ, ПСА, автоколебания, метод Прони.
Science intensive technologies in mechanical engineering, 2018
The investigation results on the deconvolution of a signal from the measuring section of an induc... more The investigation results on the deconvolution of a signal from the measuring section of an induction sensor that allows using it for monitoring and control of processing in a glow discharge in controlled processing environment with the purpose of optimization and results reproducibility in automated processing environment are presented. The induction sensor use allows defining the impact of changes in a form and amplitude of recorded electromagnetic pulses upon changes of the mean-integral value of current in a discharge and also defining time of a plant operation mode setting and also performing a rapid impact upon a process and controlling its completion.
Bulletin of Bryansk state technical university, 2016
In the paper the problem of reasons elucidation in the matter of lathe instability at groove cros... more In the paper the problem of reasons elucidation in the matter of lathe instability at groove cross turning and boring is solved. As a tool for the analysis of a structure state there are used potentialities of modal monitoring, and in particular, a correlation of modal parameters, sets of proper characteristics of an elastic system (self-frequencies, modal coefficients damping and own forms of vibrations) of lathes designs with the state of bearings in spindle units. The application of a modal approach to the evaluation of a lathe design state or an elastic system is a new section in a dynamic analysis and may be called modal diagnostics. From the analysis of the modal parameter values of a lathe one traces their tie with the lathe design characteristics, and in particular, with the existence of sever rigidity anisotropy of a spindle unit front bearing and also with its insufficient tightness. Reasoning from the information mentioned of the modal parameters connection with the rigid...
Bulletin of Bryansk state technical university, 2017
С точки зрения возможности использования принципа двойственности рассмотрена типовая обратная зад... more С точки зрения возможности использования принципа двойственности рассмотрена типовая обратная задача, часто возникающая при оценке состояния динамических систем по результатам их испытаний в режимах пассивного эксперимента, в частности при их штатной эксплуатации. Показано, что при решении типовых обратных задач оценки результатов испытаний возможно и целесообразно использование методологии двойственности с аналогичными задачами теории оптимального управления. Ключевые слова: двойственность, квадратичный критерий, обратная задача, динамическая система, автоматическое регулирование.
Bulletin of Bryansk state technical university, 2016
The article draws attention to the identity of the methods for solving problems of identification... more The article draws attention to the identity of the methods for solving problems of identification arising from the evaluation of test results of complex dynamic systems, the classical problems of the theory of optimal control. Shows how to use the latest techniques can be very effective for solving certain types of inverse problems both during active and passive experiment. The authors believe that there are many inverse problems, where it will be possible using effective methods of optimal control.
2020 International Conference Quality Management, Transport and Information Security, Information Technologies (IT&QM&IS)
Methods for identification modal parameters of machines are based on experimental modal analysis.... more Methods for identification modal parameters of machines are based on experimental modal analysis. On the example of a single test model the set of amplitude-frequency characteristics of conditional mechanical systems, two algorithms are considered: direct parametric identification and approximation of the frequency characteristic. The first algorithm that implements batch mode is based on the theory of mathematical programming. The second algorithm is based on a heuristic approach, using modal segmentation methods and implementing an interactive mode. Both algorithms give good and quite comparable results in terms of approximation accuracy, but they have their own peculiarities. Methods can be effectively used both individually and together.
2020 International Conference Quality Management, Transport and Information Security, Information Technologies (IT&QM&IS), 2020
The article describes an approach of parametric spectral analysis application in apical seismocar... more The article describes an approach of parametric spectral analysis application in apical seismocardiography using an example of the precardiac zone oscillations analysis. Parameters of individual sections of the cardio cycle can be investigated in detail using the proposed approach, which allows one to form a more accurate diagnostic representation of the heartbeat phases within the cardio cycle. The analysis of changes in the seismocardiographic signals modal composition depending on the position of a person during acquisition carried out. The presence of significant changes in the modal composition of such signals, which can be used as an additional diagnostic criterion, is shown.
Quality. Innovation. Education, 2019
2017 International Conference "Quality Management,Transport and Information Security, Information Technologies" (IT&QM&IS), 2017
Mathematical models of a mechanical system in the time and frequency areas, which are realized by... more Mathematical models of a mechanical system in the time and frequency areas, which are realized by various software complexes, are considered. The results of identification of the experimental amplitude-frequency characteristic using the software complex IMS-I are presented. It is established that the design analysis method, in which one natural frequency (one mode) is considered does not provide the dynamic quality of the mechanical system, it is necessary to change the parameters for all available natural frequencies for analysis.
Quality. Innovation. Education, 2020
This article considers a review and analysis of modern methods of modal analysis of biomedical si... more This article considers a review and analysis of modern methods of modal analysis of biomedical signals using for biomedical-engineering data measuring systems. The results of the combined use of parametric and empirical methods to eliminate noise distortions arising from the registration of signals and to identify informative components of biomedical signals of various physical natures with the aim of analyzing their structure are presented. The results of visualization of the dynamics of changes in the modal parameters of the cardiocycles of the electrocardiogram and seismocardiogram are considered. The use of modal decomposition to evaluate regulatory processes in the analysis of heart rate variability is demonstrated.
Vestnik Mashinostroeniya, 2020
The results of studies of the dynamic properties of a turning tool cutter are considered, obtaine... more The results of studies of the dynamic properties of a turning tool cutter are considered, obtained using experimental modal analysis, in the arsenal of which there are several identification methods. For comparison, the results of four methods are given. Keywords: cutting processing, vibration, tool, dynamic properties, tool holder, experimental modal analysis. alexandrmolchanov@inbox.ru
Russian Engineering Research, 2019
The basic damping properties of composite lathe structures are analyzed by modal diagnostics. New... more The basic damping properties of composite lathe structures are analyzed by modal diagnostics. New experimental results and literature data from non-Russian research are employed. The damping properties of cast-iron and composite lathe structures are compared. The composites considered are ferrocement, polymer concrete, and metal concrete.
Bulletin of Bryansk state technical university, 2018
Рассмотрены возможности использования параметрического спектрального анализа (ПСА) для идентифика... more Рассмотрены возможности использования параметрического спектрального анализа (ПСА) для идентификации режима автоколебаний в станках, что позволит: выполнить без побочных эффектов спектральное оценивание сегментов временных рядов во временных окнах ограниченной продолжительности; использовать модель нестационарного временного ряда; определить собственный спектр частот и спектр модального демпфирования мод системы, проявившихся на данном сегменте временного ряда; получить аналитический спектр Фурье сигнала. Ключевые слова: параметрический спектральный анализ, ПСА, автоколебания, метод Прони.
Science intensive technologies in mechanical engineering, 2018
The investigation results on the deconvolution of a signal from the measuring section of an induc... more The investigation results on the deconvolution of a signal from the measuring section of an induction sensor that allows using it for monitoring and control of processing in a glow discharge in controlled processing environment with the purpose of optimization and results reproducibility in automated processing environment are presented. The induction sensor use allows defining the impact of changes in a form and amplitude of recorded electromagnetic pulses upon changes of the mean-integral value of current in a discharge and also defining time of a plant operation mode setting and also performing a rapid impact upon a process and controlling its completion.
Bulletin of Bryansk state technical university, 2016
In the paper the problem of reasons elucidation in the matter of lathe instability at groove cros... more In the paper the problem of reasons elucidation in the matter of lathe instability at groove cross turning and boring is solved. As a tool for the analysis of a structure state there are used potentialities of modal monitoring, and in particular, a correlation of modal parameters, sets of proper characteristics of an elastic system (self-frequencies, modal coefficients damping and own forms of vibrations) of lathes designs with the state of bearings in spindle units. The application of a modal approach to the evaluation of a lathe design state or an elastic system is a new section in a dynamic analysis and may be called modal diagnostics. From the analysis of the modal parameter values of a lathe one traces their tie with the lathe design characteristics, and in particular, with the existence of sever rigidity anisotropy of a spindle unit front bearing and also with its insufficient tightness. Reasoning from the information mentioned of the modal parameters connection with the rigid...
Bulletin of Bryansk state technical university, 2017
С точки зрения возможности использования принципа двойственности рассмотрена типовая обратная зад... more С точки зрения возможности использования принципа двойственности рассмотрена типовая обратная задача, часто возникающая при оценке состояния динамических систем по результатам их испытаний в режимах пассивного эксперимента, в частности при их штатной эксплуатации. Показано, что при решении типовых обратных задач оценки результатов испытаний возможно и целесообразно использование методологии двойственности с аналогичными задачами теории оптимального управления. Ключевые слова: двойственность, квадратичный критерий, обратная задача, динамическая система, автоматическое регулирование.
Bulletin of Bryansk state technical university, 2016
The article draws attention to the identity of the methods for solving problems of identification... more The article draws attention to the identity of the methods for solving problems of identification arising from the evaluation of test results of complex dynamic systems, the classical problems of the theory of optimal control. Shows how to use the latest techniques can be very effective for solving certain types of inverse problems both during active and passive experiment. The authors believe that there are many inverse problems, where it will be possible using effective methods of optimal control.
2020 International Conference Quality Management, Transport and Information Security, Information Technologies (IT&QM&IS)
Methods for identification modal parameters of machines are based on experimental modal analysis.... more Methods for identification modal parameters of machines are based on experimental modal analysis. On the example of a single test model the set of amplitude-frequency characteristics of conditional mechanical systems, two algorithms are considered: direct parametric identification and approximation of the frequency characteristic. The first algorithm that implements batch mode is based on the theory of mathematical programming. The second algorithm is based on a heuristic approach, using modal segmentation methods and implementing an interactive mode. Both algorithms give good and quite comparable results in terms of approximation accuracy, but they have their own peculiarities. Methods can be effectively used both individually and together.