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Journal articles on the topic 'Natural self-oscillatory system'

Author: Grafiati

Published: 5 June 2025

Last updated: 2 August 2025

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1

Kurkin, Semen A., Danil D. Kulminskiy, Vladimir I. Ponomarenko, Mikhail D. Prokhorov, Sergey V. Astakhov, and Alexander E. Hramov. "Central pattern generator based on self-sustained oscillator coupled to a chain of oscillatory circuits." Chaos: An Interdisciplinary Journal of Nonlinear Science 32, no. 3 (2022): 033117. http://dx.doi.org/10.1063/5.0077789.

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We have proposed and studied both numerically and experimentally a multistable system based on a self-sustained Van der Pol oscillator coupled to passive oscillatory circuits. The number of passive oscillators determines the number of multistable oscillatory regimes coexisting in the proposed system. It is shown that our system can be used in robotics applications as a simple model for a central pattern generator (CPG). In this case, the amplitude and phase relations between the active and passive oscillators control a gait, which can be adjusted by changing the system control parameters. Vari

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2

MAKOWIEC, DANUTA. "MODELING THE SINOATRIAL NODE BY CELLULAR AUTOMATA WITH IRREGULAR TOPOLOGY." International Journal of Modern Physics C 21, no. 01 (2010): 107–27. http://dx.doi.org/10.1142/s0129183110015002.

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The role of irregularity in intercellular connections is studied in the first natural human pacemaker called the sinoatrial node by modeling with the Greenberg–Hastings cellular automata. Facts from modern physiology about the sinoatrial node drive modeling. Heterogeneity between cell connections is reproduced by a rewiring procedure applied to a square lattice. The Greenberg–Hastings rule, representing the intrinsic cellular dynamics, is modified to imitate self-excitation of each pacemaker cell. Moreover, interactions with nearest neighbors are changed to heterogeneous ones by enhancing hori

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3

Zaitsev, Valery V., and Alexander V. Karlov. "Quasi-harmonic self-oscillations in discrete time: analysis and synthesis of dynamic systems." Physics of Wave Processes and Radio Systems 24, no. 4 (2022): 19–24. http://dx.doi.org/10.18469/1810-3189.2021.24.4.19-24.

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For sampling of time in a differential equation of movement of Thomson type oscillator (generator) it is offered to use a combination of the numerical method of finite differences and an asymptotic method of the slowl-changing amplitudes. The difference approximations of temporal derivatives are selected so that, first, to save conservatism and natural frequency of the linear circuit of self-oscillatory system in the discrete time. Secondly, coincidence of the difference shortened equation for the complex amplitude of self-oscillations in the discrete time with Eulers approximation of the shor

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4

Novikov, Sergey, and Vlada Kosterova. "Stable and Unstable Dynamic Processes in a Self-Oscillating System with Three Degrees of Freedom." Infocommunications and Radio Technologies 5, no. 2 (2022): 218–35. http://dx.doi.org/10.29039/2587-9936.2022.05.2.16.

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The work is devoted to the study of the dynamic instability of coherent regimes of a system of two self-oscillators with a strong mutual resonant coupling. It is shown that this system can generate synchronous oscillations at three different frequencies, they correspond to the basic types of oscillations-modes: one in-phase and two anti-phase. A qualitative analysis of the influence of the characteristics of the resonant coupling on the stability of natural synchronous modes of oscillations has been carried out. An analytical criterion for the instability of in-phase oscillations and the condi

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5

Rakhimov, Mukhametberdy. "Optimal Modeling of Oscillatory Systems for Engineering Technology and Quality Stem Education." Journal of Lifestyle and SDGs Review 5, no. 4 (2025): e05996. https://doi.org/10.47172/2965-730x.sdgsreview.v5.n04.pe05996.

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Introduction: The article considers qualitative issues of modern education in the field of engineering technologies (SDGs 4,9,11). The problems of optimal modeling of oscillatory systems, the dynamics of which are described by differential equations with partial derivatives of the second and sixth orders with different boundary conditions corresponding to the positions of the ends of a circular arch, rods and beams, are solved. In the problems of optimal synthesis of controls, the minimization of the energy quadratic functionals of the physical system under consideration, associated with the p

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Mondal, Sirshendu, Samadhan A. Pawar, and R. I. Sujith. "Forced synchronization and asynchronous quenching of periodic oscillations in a thermoacoustic system." Journal of Fluid Mechanics 864 (February 1, 2019): 73–96. http://dx.doi.org/10.1017/jfm.2018.1011.

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We perform an experimental and theoretical study to investigate the interaction between an external harmonic excitation and a self-excited oscillatory mode ($f_{n0}$) of a prototypical thermoacoustic system, a horizontal Rijke tube. Such an interaction can lead to forced synchronization through the routes of phase locking or suppression. We characterize the transition in the synchronization behaviour of the forcing and the response signals of the acoustic pressure while the forcing parameters, i.e. amplitude ($A_{f}$) and frequency ($f_{f}$) of forcing are independently varied. Further, suppre

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7

Салимова, А. И., and Р. И. Паровик. "Mathematical Model of Van der Pol-Airy Fractional Oscillator." Вестник КРАУНЦ. Физико-математические науки 47, no. 2 (2024): 21–34. http://dx.doi.org/10.26117/2079-6641-2024-47-2-21-34.

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В работе предложена математическая модель нелинейного осциллятора Ван дер Поля-Эйри с учетом наследственности. Нелинейность осциллятора обусловлена наличием зависимости коэффициента трения от квадрата функции смещения, что характерно для осциллятора Ван дер Поля. Также собственная частота колебаний представляет собой функцию от времени, которая линейно возрастает при его возрастании. Последнее характерно для осциллятора Эйри. Эффекты наследственности вводятся в модельное уравнение посредством дробных производных в смысле Герасимова-Капуто. Они указывают на то, что колебательная система может о

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8

Narain, A., J. H. Kurita, M. Kivisalu, et al. "Internal Condensing Flows inside a Vertical Pipe: Experimental/Computational Investigations of the Effects of Specified and Unspecified (Free) Conditions at Exit." Journal of Heat Transfer 129, no. 10 (2007): 1352–72. http://dx.doi.org/10.1115/1.2755063.

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Reported experimental and computational results confirm that both the flow features and heat-transfer rates inside a condenser depend on the specification of inlet, wall, and exit conditions. The results show that the commonly occurring condensing flows’ special sensitivity to changes in exit conditions (i.e., changes in exit pressure) arises from the ease with which these changes alter the vapor flow field in the interior. When, at a fixed steady mass flow rate, the exit pressure is changed from one steady value to another, the changes required of the interior vapor flow toward achieving a ne

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9

Arsanova, G. "CONCEPTUAL MODEL OF GEYSER GEOLOGICAL STRUCTURE." Scientific heritage, no. 107 (February 24, 2023): 29–44. https://doi.org/10.5281/zenodo.7672912.

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A new conceptual model of the geological structure of geysers is proposed. The properties and characteristics of geysers were compared with the processes as a result of which they may appear or, conversely, cannot appear. Systematic analysis showed that the gas and mineral composition of geyser waters, their temperature and a number of their other indicators do not correspond to the story according to which meteor waters are heated by magmatic bodies in Nature. The geological localization of geysers indicated the connection of their occurrence with long-lived volcanic centers, which is confirm

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10

Schleussner, C. F., J. Runge, J. Lehmann, and A. Levermann. "The role of the North Atlantic overturning and deep ocean for multi-decadal global-mean-temperature variability." Earth System Dynamics 5, no. 1 (2014): 103–15. http://dx.doi.org/10.5194/esd-5-103-2014.

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Abstract. Earth's climate exhibits internal modes of variability on various timescales. Here we investigate multi-decadal variability of the Atlantic meridional overturning circulation (AMOC), Northern Hemisphere sea-ice extent and global mean temperature (GMT) in an ensemble of CMIP5 models under control conditions. We report an inter-annual GMT variability of about ±0.1° C originating solely from natural variability in the model ensemble. By decomposing the GMT variance into contributions of the AMOC and Northern Hemisphere sea-ice extent using a graph-theoretical statistical approach, we fi

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11

Alekseev, Valery I. "Forecasting changes in the earth’s climate system by instrumental measurements and paleodata in the phase-time region, consistent with changes in the barycentric motions of the sun. Part 1." Yugra State University Bulletin 20, no. 2 (2024): 74–96. http://dx.doi.org/10.18822/byusu20240274-96.

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The relevance of the research is due to the need to establish the root cause of climate change on Earth and predict changes in heliocosmic, climatic variables, natural disasters by intramental measurements and paleodata, as time series, for long intervals of the time horizon in the phase domain, taking into account their cyclicity and interdependence of changes. Purpose of research: application of the time series analysis method of the time series to establish the strength of the influence of the barycentric movements of the Sun on the variability of heliocosmic, climatic variables, natural di

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12

Deduchenko, F. M., and A. N. Dmitrievskii. "Ensuring Safety of Gas Field Infrastructure Using ALARP and a Systematic Approach." Safety of Technogenic and Natural Systems, no. 4 (December 7, 2023): 55–69. http://dx.doi.org/10.23947/2541-9129-2023-7-4-55-69.

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Introduction. A significant part of the global and state economy is the production and supply of hydrocarbon raw materials. The issues of safety in this area will remain important in the coming decades. The problem is actively discussed in the professional and scientific community. Theoretical and applied works are published. Local, point-based methods are calculated and implemented, which allow predicting and preventing emergencies in certain units of the considered objects. At the same time, there are no sufficiently justified and reproducible system solutions that can take into account the

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13

Bulygina, M. E., and S. Yu Bulygin. "Soil degradation – the result of anthropogenic factors." MECHANICS and AUTOMATICS of AGROINDUSTRIAL PRODUCTION, no. 2(116) (2023): 25–37. http://dx.doi.org/10.37204/2786-7765-2023-2-3.

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Annotation Purpose. To develop a matrix for the classification of degradation processes, regarding the possibility of soil restoration according to their list, which will allow to create a system of indicators of the degree of soil degradation, which in most cases will determine the probability of their restoration. To determine the diagnostic criteria of the degree of soil degradation. Methods. Field, laboratory, statistical. Results. The degree of soil degradation means a certain change in the characteristics of their condition, which quantitatively reflects the deterioration of the composit

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14

Ilich, Kaganov William. "Tropical cyclone, as powerful natural self-oscillatory systems, and wind-energetic a way of struggle against it—The analysis of a cyclone from a position of the theory of vibrations." Natural Science 04, no. 07 (2012): 508–15. http://dx.doi.org/10.4236/ns.2012.47068.

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15

Venegas-Pineda, Luis Guillermo, Hildeberto Jardón-Kojakhmetov, and Ming Cao. "Co-evolutionary control of a class of coupled mixed-feedback systems." Chaos: An Interdisciplinary Journal of Nonlinear Science 35, no. 3 (2025). https://doi.org/10.1063/5.0230879.

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Oscillatory behavior is ubiquitous in many natural and engineered systems, often emerging through self-regulating mechanisms. In this paper, we address the challenge of stabilizing a desired oscillatory pattern in a networked system where neither the internal dynamics nor the interconnections can be changed. To achieve this, we propose two distinct control strategies. The first requires the full knowledge of the system generating the desired oscillatory pattern, while the second only needs local error information. In addition, the controllers are implemented as co-evolutionary, or adaptive, ru

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16

Feng, Jian. "Modeling the pathophysiology of Parkinson’s disease in patient-specific neurons." Experimental Biology and Medicine, September 24, 2020, 153537022096178. http://dx.doi.org/10.1177/1535370220961788.

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The 30 trillion cells that self-assemble into a human being originate from the pluripotent stem cells in the inner cell mass of a human blastocyst. The discovery of induced pluripotent stem cells (iPSCs) makes it possible to approximate various aspects of this natural developmental process artificially by generating materials that can be used in invasive mechanistic studies of virtually all human conditions. In Parkinson’s disease, instructions computed by the basal ganglia to control voluntary motor functions break down, leading to widespread rhythmic bursting activities in the basal ganglia

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17

Kalinin, E., S. Lebedev, and Yu Kozlov. "ANALYTICAL STUDY OF FRICTIONAL AUTO-VIBRATIONS IN SYSTEMS WITH TWO DEGREES OF FREEDOM." Technical and technological aspects of development and testing of new machinery and technologies for agriculture of Ukraine, no. 29(43) (December 2021). http://dx.doi.org/10.31473/2305-5987-2021-1-29(43)-5.

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Abstract Purpose of the study is to study the properties of frictional self-oscillations in systems with two degrees of freedom. As a research method, the asymptotic method of N.N. Bogolyubov and Y.A. Metropolitan. Research methods. The methodological basis of the work is the generalization and analysis of the known scientific results of the dynamics of systems in resonance modes and the use of a systematic approach. The analytical method and comparative analysis were used to form a scientific problem, goal and formulation of research objectives. When developing empirical models, the main prov

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18

Gunji, Yukio Pegio, Yoshihiko Ohzawa, Yuuki Tokuyama, and Kentaro Eto. "Quantum logic automata generalizing the edge of chaos in complex systems." Frontiers in Complex Systems 2 (August 6, 2024). http://dx.doi.org/10.3389/fcpxs.2024.1347930.

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BackgroundHistorically, although researchers in the science of complex systems proposed the idea of the edge of chaos and/or self-organized criticality as the essential feature of complex organization, they were not able to generalize this concept. Complex organization is regarded at the edge of chaos between the order phase and the chaos phase and a very rare case. Additionally, in cellular automata, the critical property is class IV, which is also rarely found. Therefore, there can be overestimation for natural selection. More recently, developments in cognitive and brain science have led to

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19

Wang, Xiaojia, and Ivan C. Christov. "Reduced modelling and global instability of finite-Reynolds-number flow in compliant rectangular channels." Journal of Fluid Mechanics 950 (October 24, 2022). http://dx.doi.org/10.1017/jfm.2022.802.

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Experiments have shown that flow in compliant microchannels can become unstable at a much lower Reynolds number than the corresponding flow in a rigid conduit. Therefore, it has been suggested that the wall's elastic compliance can be exploited towards new modalities of microscale mixing. While previous studies mainly focused on the local instability induced by the fluid–structure interactions (FSIs) in the system, we derive a one-dimensional (1-D) model to study the FSI's effect on the global instability. The proposed 1-D FSI model is tailored to long, shallow rectangular microchannels with a

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20

Лоренц, А. С., and Д. Г. Мясищев. "Features of the device, the design and use of experimental equipment for the study of elements of brake systems, chassis timber." Известия СПбЛТА, no. 218(218) (March 20, 2017). http://dx.doi.org/10.21266/2079-4304.2017.218.121-129.

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Статья посвящена обзору конструкции экспериментального оборудования для исследования тормозных систем. С повышением интенсивности движения и общего веса лесотранспортных систем возрастают требования к эффективности и безопасности торможения. Тягово-скоростные и тормозные свойства лесотранспортных машин связаны между собой. Чем выше скорость движения машины, тем эффективнее должны быть ее тормозные свойства. Следовательно, безопасность движения и производительность в большей мере зависят от тормозных свойств лесотранспортной машины. Кроме того, существует целая гамма внутризаводского самоходног

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21

Bigaj, Adam, Marcello Antonio Budroni, and Laurence Rongy. "Influence of chemo‐hydrodynamical oscillations in bimolecular reactions on mixing." ChemSystemsChem, January 31, 2025. https://doi.org/10.1002/syst.202400099.

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Self‐organizing behaviors have long been studied in complex chemical systems involving a nonlinear chemical feedback (e.g. the Belousov‐Zhabotinsky and Bray‐Liebhafsky reactions). Here we explore the emergence of oscillatory dynamics by coupling simpler chemical processes, in the form of a bimolecular reaction, and natural convection (i.e. flows induced by changes in density and surface tension occurring during the reaction). We study and classify different possible scenarios based on the interplay between chemically‐driven Marangoni‐ (surface tension induced) and buoyancy‐driven (density indu

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