Relevant bibliographies by topics / Natural self-oscillatory system

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Academic literature on the topic 'Natural self-oscillatory system'

Author: Grafiati
Published: 5 June 2025
Last updated: 2 August 2025

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

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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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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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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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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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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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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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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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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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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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Conference papers on the topic "Natural self-oscillatory system"

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Ivanović-Šašić, Ana, Stevan Maćešić, Jelena Maksimović, Željko Čupić, and Ljiljana Kolar-Anić. "Numerical simulations of the oscillatory dynamics in the Bray-Liebhafsky reaction perturbed by L-tyrosine." In 2nd International Conference on Chemo and Bioinformatics. Institute for Information Technologies, University of Kragujevac, 2023. http://dx.doi.org/10.46793/iccbi23.609is.

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It is well known that almost all living or biological systems are naturally in the oscillatory dynamic states and can be considered as biochemical reaction systems. These oscillatory dynamic states can be caused by internal self-organized phenomena, but also by external periodic variations of temperature, light, food, or seasonal changes. The hypothalamic-pituitary-thyroid (HPT) axis is one such nonlinear system with feedback that is always in an oscillatory dynamic state and L-tyrosine is its main representative. The biological importance of L-tyrosine interactions with iodine species was the
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Kancharala, Ashok K., and Michael K. Philen. "The Role of Flexibility on Center of Mass Oscillations of Self Propelled Flapping Fins." In ASME 2015 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/smasis2015-9109.

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Flexibility is known to improve the propulsive performance of flapping fins. Flapping fins generate forces oscillatory in nature and this paper reports an investigation on the effect of flexibility and other parameters such as heaving, pitching amplitudes and operating frequency in reducing the center of mass oscillations of bodies attached to flapping fins. A detailed theoretical investigation has been carried out to predict the optimal operating parameters along with the fin stiffness to reduce the COM oscillations for a given self-propelled speed (SPS). Some design guidelines have been prop
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Braccesi, Claudio, Filippo Cianetti, and Luca Landi. "Analytical Model, Multibody Simulation and Validation Tests for Dynamical Instability Reduction of a Grinding Machine With Dampers." In ASME 2011 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/detc2011-47712.

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The subject of the present paper is the dynamic instability (chatter) of machine tools. The chatter is a self-regenerative oscillatory phenomenon related to the tool-work piece interaction during the process; that leads to an incorrect surface finishing of work piece. In big machine tools passive damping components are often introduced in order to reduce the chatter. Those passive components have to be tuned to the natural frequency of chatter vibrations, measured experimentally or predicted theoretically. In this paper the reduction of chatter for a planar grinding machine is described. At fi
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Gessesse, Yemane, Helmi Attia, and M. O. M. Osman. "A Generalized Impact-Sliding Fretting Wear Model Based on Fracture Mechanics Approach." In ASME 2004 International Mechanical Engineering Congress and Exposition. ASMEDC, 2004. http://dx.doi.org/10.1115/imece2004-60486.

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Impact-sliding fretting wear is a complex phenomenon due to the random nature of the flow-induced vibrations, and the self-induced tribological changes. Available models, which relate wear losses to the process variables, are empirical in nature and bear no physical similarity to the actual mathematical and physical attributes of the wear process. A generalized model is developed in the present work to mathematically describe the fretting wear process under various modes of motion, namely, impact, sliding and oscillatory. This model, which is based on the findings from the fracture mechanics a
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Petrash, Kostiantyn, Gennadii Bagliuk, and Tetiana Solntseva. "On changes in the mechanism of chemical affinancy in the synthesis of compounds of refractory metals with oxygen group elements." In IXth INTERNATIONAL SAMSONOV CONFERENCE “MATERIALS SCIENCE OF REFRACTORY COMPOUNDS”. Frantsevich Ukrainian Materials Research Society, 2024. http://dx.doi.org/10.62564/m4-kp1521.

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Thermodynamic interpretation of chemical affinity as the tendency for chemical components to interact was given by Théophile de Donde. It manifests itself in systems up to the threshold of thermodynamic stability. In work [1], during the decomposition of unstable chalcogenides of refractory metals and during their interaction with metals of IVA, VA groups and chromium, both the existence and synthesis of unstable compounds of these metals with chalcogen type MeX3, MeX4 were established. An increase in the amount of chalcogen is observed during decomposition. To clarify the nature of the mechan
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