Article
Mathematics, Applied
Kaito Kato, Naohiko Inaba, Kuniyasu Shimizu, Takuji Kousaka, Hideaki Okazaki
Summary: The existence of nested mixed-mode oscillation (MMO) generated by a driven slow-fast Bonhoeffer-van der Pol (BVP) oscillator has been confirmed in previous studies. It is asserted that nested MMOs can occur regardless of the type of Hopf bifurcation when no perturbation is applied, suggesting that this phenomenon could be widespread. The study demonstrates that weak periodic perturbations in a classical BVP oscillator can result in at least doubly nested MMOs, which is supported by first return plots.
PHYSICA D-NONLINEAR PHENOMENA
(2022)
Article
Mathematics, Applied
Naohiko Inaba, Tadashi Tsubone, Hidetaka Ito, Hideaki Okazaki, Tetsuya Yoshinaga
Summary: In this study, nested mixed-mode oscillations (MMOs) generated by a driven Bonhoeffer-van der Pol (BVP) oscillator were discovered and compared with nested period-adding bifurcations generated with the Nagumo-Sato map. The Poincare return maps of the driven BVP oscillator were constructed one-dimensionally, and they consisted of two downward convex branches. The results showed that the bifurcations generated by the driven BVP oscillator coincided with the period-adding bifurcations generated with the Nagumo-Sato map.
PHYSICA D-NONLINEAR PHENOMENA
(2023)
Article
Mathematics, Applied
Naohiko Inaba, Takuji Kousaka, Tadashi Tsubone, Hideaki Okazaki, Hidetaka Ito
Summary: This study examines a nonlinear conductor, including an idealized diode, in an extended Bonhoeffer-van der Pol oscillator. By constructing Poincare return maps, various phenomena such as simple mixed-mode oscillations and oscillation-incrementing bifurcations are explained. Experimental verification of theoretical results was conducted.
Article
Mathematics
Sergey Kashchenko
Summary: This article investigates the well-known Van der Pol equation with delayed feedback. Assuming a sufficiently large delay factor, critical cases in the stability problem of the zero equilibrium state are identified and found to have infinite dimension. Special local analysis methods are developed for these critical cases, resulting in the construction of nonlinear evolutionary boundary value problems that serve as normal forms. These boundary value problems can be equations of the Ginzburg-Landau type, as well as equations with delay and special nonlinearity. The nonlocal dynamics of the constructed equations determine the local behavior of the solutions to the original equation. Similar normalized boundary value problems also arise for the Van der Pol equation with a large coefficient of the delay equation. The important problem of a small perturbation containing a large delay is considered separately, as well as the Van der Pol equation with cubic nonlinearity containing a large delay. In conclusion, the dynamics of the Van der Pol equation with a large delay is complex and diverse, fundamentally differing from the dynamics of the classical Van der Pol equation.
Article
Mathematics, Applied
Xindong Ma, Yue Yu, Lifeng Wang
Summary: This study investigates the generation mechanism of four mixed-mode vibration types triggered by the pitchfork bifurcation delay phenomenon in a driven van der Pol-Duffing oscillator, demonstrating the prominent role of the pitchfork bifurcation delay phenomenon in the occurrence of these vibration types.
APPLIED MATHEMATICS AND COMPUTATION
(2021)
Article
Physics, Multidisciplinary
Kundan Lal Das, Munehisa Sekikawa, Tadashi Tsubone, Naohiko Inaba, Hideaki Okazaki
Summary: This Letter discusses the complete and in-phase synchronization of canards generated in identical and nearly identical coupled canard-generating Bonhoeffer-van der Pol oscillators. The study explores how synchronization occurs in systems with different coupling parameters. Numerical simulations demonstrate that complete and in-phase synchronization of canards occurs in systems with relatively small coupling parameters. Furthermore, experimental observations reveal that complete synchronization of canards requires stronger coupling. The paper explains the necessity of strong coupling for observing complete synchronization in experiments.
Article
Engineering, Mechanical
Shinpachiro Urasaki, Hiroshi Yabuno
Summary: This study proposes an experimental method for identifying the backbone curves of cantilevers using the nonlinear dynamics of a van der Pol oscillator. By eliminating the effect of the viscous environment, the proposed method enables direct identification of the backbone curve in experiments. The efficiency of this method is demonstrated by successfully identifying the backbone curves of macrocantilevers with hardening and softening cubic nonlinearities.
NONLINEAR DYNAMICS
(2021)
Article
Engineering, Mechanical
Xiujing Han, Qinsheng Bi
Summary: This paper investigates the effects of amplitude modulation on mixed-mode dynamics. It is found that the introduction of amplitude modulation leads to distinct oscillations in the quasi-static processes of mixed-mode oscillations (MMOs), while the active phases of MMOs remain mostly the same. The dynamical characteristics are related to the evolution patterns of the amplitude-modulated forcing, with the vibration frequency of quasi-static processes determined by the modulation frequency and the transition of MMOs determined by the modulation amplitude. These results enrich the understanding of fast-slow dynamics and provide valuable insights for exploring mixed-mode dynamics in other nonlinear systems induced by amplitude modulation.
NONLINEAR DYNAMICS
(2023)
Article
Engineering, Mechanical
Fatemeh Afzali, Ehsan Kharazmi, Brian F. Feeny
Summary: This work analyzes secondary resonances in the parametrically damped van der Pol equation, both with and without external excitation. It focuses on a potential application in vertical-axis wind-turbine blades, which experience cyclic damping, aeroelastic self-excitation, and direct excitation. The system is studied using the method of multiple scales and numerical solutions. The analysis reveals various responses, including nonresonant phase drift, subharmonic resonance, and potential phase locking.
NONLINEAR DYNAMICS
(2023)
Article
Mathematics, Applied
Zhihao Cen, Feng Xie
Summary: In this paper, we characterize all the Darboux polynomials of a Mathieu-van der Pol-Duffing oscillator by transforming from the original system into a three dimensional system. We also provide a complete classification of the rational first integrals and of the Darboux first integrals through the analysis of its Darboux polynomials and its exponential factors.
NONLINEAR ANALYSIS-REAL WORLD APPLICATIONS
(2023)
Article
Mathematics, Interdisciplinary Applications
Hidetaka Ito, Naohiko Inaba, Hideaki Okazaki
Summary: In this study, nested mixed-mode oscillations (MMOs) generated by a Bonhoeffer-van der Pol (BVP) oscillator were discovered, specifically focusing on singly nested MMOs occurring between the 14th and 15th generating regions. Numerical results suggest a convergence to a universal constant of one, indicating incrementing bifurcations towards an MMO increment-terminating tangent bifurcation point.
IEICE NONLINEAR THEORY AND ITS APPLICATIONS
(2021)
Article
Engineering, Electrical & Electronic
Yue Yu, Wenyao Zhou, Zhenyu Chen
Summary: This study investigates the multi-timescale characteristics in a generalized Bonhoeffer-van der Pol electronic circuit. By using two fast-slow decompositions, the dynamics of mixed mode oscillations and period-adding sequences are analyzed. The variation of parameters leads to bursting dynamics and chaotic behaviors in the system.
AEU-INTERNATIONAL JOURNAL OF ELECTRONICS AND COMMUNICATIONS
(2022)
Article
Engineering, Mechanical
A. Bochkarev, A. Zemlyanukhin
Summary: The study on active particles coupled by the Morse potential with Van der Pol dissipation reveals the existence of soliton-like perturbations and two types of kink, slow and fast. The parameters of the kinks are determined by different mathematical equations and the propagation modes of the perturbations in different boundary conditions are investigated.
NONLINEAR DYNAMICS
(2021)
Article
Mathematics, Applied
Hebai Chen, Yilei Tang, Dongmei Xiao
Summary: We investigated the dynamics of a hybrid van der Pol-Rayleigh oscillator used to model self-sustained walking behaviors, revealing new dynamics distinct from traditional oscillators. The global bifurcation diagram and phase portraits of this oscillator were presented in parameter space, with characterization of the locations and amplitudes of periodic oscillations.
PHYSICA D-NONLINEAR PHENOMENA
(2021)
Article
Physics, Multidisciplinary
T. Bhagyaraj, S. Sabarathinam, A. Ishaq Ahamed, K. Thamilmaran
Summary: In this paper, the phenomenon of super-extreme events in the forced BVP oscillator is reported, and their existence is verified. This has important implications for understanding and applying extreme events in different systems.
PRAMANA-JOURNAL OF PHYSICS
(2023)
Article
Mathematics, Applied
Naohiko Inaba, Takuji Kousaka, Tadashi Tsubone, Hideaki Okazaki, Hidetaka Ito
Summary: This study examines a nonlinear conductor, including an idealized diode, in an extended Bonhoeffer-van der Pol oscillator. By constructing Poincare return maps, various phenomena such as simple mixed-mode oscillations and oscillation-incrementing bifurcations are explained. Experimental verification of theoretical results was conducted.
Article
Chemistry, Multidisciplinary
Kazuya Ozawa, Kaito Isogai, Hideo Nakano, Hideaki Okazaki
Summary: This paper explores the application of one-dimensional map methods in circuits, discussing the mathematical definition and conditions for the existence of formal chaos. Through the use of Maple, formal chaos existence and bifurcation behavior in 1-D maps are demonstrated. Additionally, the application of Lyapunov exponent in observing formal chaos in bifurcation processes is outlined.
APPLIED SCIENCES-BASEL
(2021)
Article
Nanoscience & Nanotechnology
Shu Karube, Yuki Uemura, Takuji Kousaka, Naohiko Inaba
Summary: The bouncing ball system has been extensively studied for several decades. In this study, we investigated the traditional bouncing ball system numerically and experimentally and discovered nonsmooth stepwise increases in the maximum height of the bouncing ball. We focused on the time interval for the ball to take off and land on the oscillating table and found that the multiplication of this time interval and the oscillation frequency coincides with integer values, causing the nonsmooth maximum heights.
Article
Mathematics, Interdisciplinary Applications
Haruna Matsushita, Hiroaki Kurokawa, Takuji Kousaka
Summary: This paper proposes a non-gradient-based simultaneous strategy for detecting bifurcation parameters in dynamical systems. The proposed method uses a single optimization algorithm with two interdependent objective functions, one for a periodic condition and the other for a bifurcation condition. In addition, a novel approach to easily detect a two-parameter bifurcation diagram is presented.
CHAOS SOLITONS & FRACTALS
(2023)
Article
Mathematics, Interdisciplinary Applications
Tomo Hasegawa, Haruna Matsushita, Takuji Kousaka, Hiroaki Kurokawa
Summary: This paper discusses the parallelization of NLPSO to reduce the computation time for bifurcation point detection. By implementing parallelization using CUDA, the speed of bifurcation point identification with NLPSO was improved up to 24 times in our experiments.
IEICE NONLINEAR THEORY AND ITS APPLICATIONS
(2022)
Article
Mathematics, Interdisciplinary Applications
Takaya Hirayama, Haruna Matsushita, Hiroaki Kurokawa, Takuji Kousaka
Summary: Nested-layer particle swarm optimization (NLPSO) is a powerful method for detecting bifurcation parameters in dynamical systems. However, it faces challenges when multiple types and periods of bifurcation parameters exist in the search parameter space. By introducing a penalty term and a simple condition, the extended NLPSO objective functions can accurately detect the target bifurcation parameters.
IEICE NONLINEAR THEORY AND ITS APPLICATIONS
(2022)
Article
Mathematics, Interdisciplinary Applications
Kaito Kato, Naohiko Inaba, Takuji Kousaka
Summary: This study investigated the bifurcation phenomena of doubly nested mixed-mode oscillations (MMOs) in a driven classical Bonhoeffer-van der Pol oscillator. A one-parameter bifurcation diagram and phase planes were used to confirm the circuit behavior around the bifurcation points. First-return maps were then used to show the effects of bifurcation phenomena on sequences of doubly nested MMOs. The composite first-return map qualitatively explains the bifurcation mechanism that causes doubly nested MMOs.
IEICE NONLINEAR THEORY AND ITS APPLICATIONS
(2022)
Review
Mathematics, Interdisciplinary Applications
Hiroyuki Asahara, Takuji Kousaka
Summary: This study introduces a stability analysis method based on the monodromy matrix for switched dynamical systems, focusing on nonlinear autonomous interrupted systems and impacting systems with periodic threshold. The aim is to contribute to the development of nonlinear theory in engineering applications.
IEICE NONLINEAR THEORY AND ITS APPLICATIONS
(2021)
Article
Mathematics, Interdisciplinary Applications
Hidetaka Ito, Naohiko Inaba, Hideaki Okazaki
Summary: In this study, nested mixed-mode oscillations (MMOs) generated by a Bonhoeffer-van der Pol (BVP) oscillator were discovered, specifically focusing on singly nested MMOs occurring between the 14th and 15th generating regions. Numerical results suggest a convergence to a universal constant of one, indicating incrementing bifurcations towards an MMO increment-terminating tangent bifurcation point.
IEICE NONLINEAR THEORY AND ITS APPLICATIONS
(2021)
Article
Mathematics, Applied
Melanie Kobras, Valerio Lucarini, Maarten H. P. Ambaum
Summary: In this study, a minimal dynamical system derived from the classical Phillips two-level model is introduced to investigate the interaction between eddies and mean flow. The study finds that the horizontal shape of the eddies can lead to three distinct dynamical regimes, and these regimes undergo transitions depending on the intensity of external baroclinic forcing. Additionally, the study provides insights into the continuous or discontinuous transitions of atmospheric properties between different regimes.
PHYSICA D-NONLINEAR PHENOMENA
(2024)
Article
Mathematics, Applied
Shu-hong Xue, Yun-yun Yang, Biao Feng, Hai-long Yu, Li Wang
Summary: This research focuses on the robustness of multiplex networks and proposes a new index to measure their stability under malicious attacks. The effectiveness of this method is verified in real multiplex networks.
PHYSICA D-NONLINEAR PHENOMENA
(2024)
Article
Mathematics, Applied
Julien Nespoulous, Guillaume Perrin, Christine Funfschilling, Christian Soize
Summary: This paper focuses on optimizing driver commands to limit energy consumption of trains under punctuality and security constraints. A four-step approach is proposed, involving simplified modeling, parameter identification, reformulation of the optimization problem, and using evolutionary algorithms. The challenge lies in integrating uncertainties into the optimization problem.
PHYSICA D-NONLINEAR PHENOMENA
(2024)
Article
Mathematics, Applied
Alain Bourdier, Jean-Claude Diels, Hassen Ghalila, Olivier Delage
Summary: In this article, the influence of a turbulent atmosphere on the growth of modulational instability, which is the cause of multiple filamentation, is studied. It is found that considering the stochastic behavior of the refractive index leads to a decrease in the growth rate of this instability. Good qualitative agreement between analytical and numerical results is obtained.
PHYSICA D-NONLINEAR PHENOMENA
(2024)
Article
Mathematics, Applied
Ling An, Liming Ling, Xiaoen Zhang
Summary: In this paper, an integrable fractional derivative nonlinear Schrodinger equation is proposed and a reconstruction formula of the solution is obtained by constructing an appropriate Riemann-Hilbert problem. The explicit fractional N-soliton solution and the rigorous verification of the fractional one-soliton solution are presented.
PHYSICA D-NONLINEAR PHENOMENA
(2024)
Article
Mathematics, Applied
Marzia Bisi, Nadia Loy
Summary: This paper proposes and investigates general kinetic models with transition probabilities that can describe the simultaneous change of multiple microscopic states of the interacting agents. The mathematical properties of the kinetic model are proved, and the quasi-invariant asymptotic regime is studied and compared with other models. Numerical tests are performed to demonstrate the time evolution of distribution functions and macroscopic fields.
PHYSICA D-NONLINEAR PHENOMENA
(2024)
Article
Mathematics, Applied
Carlos A. Pires, David Docquier, Stephane Vannitsem
Summary: This study presents a general theory for computing information transfers in nonlinear stochastic systems driven by deterministic forcings and additive and/or multiplicative noises. It extends the Liang-Kleeman framework of causality inference to nonlinear cases based on information transfer across system variables. The study introduces an effective method called the 'Causal Sensitivity Method' (CSM) for computing the rates of Shannon entropy transfer between selected causal and consequential variables. The CSM method is robust, cheaper, and less data-demanding than traditional methods, and it opens new perspectives on real-world applications.
PHYSICA D-NONLINEAR PHENOMENA
(2024)
Article
Mathematics, Applied
Feiting Fan, Minzhi Wei
Summary: This paper focuses on the existence of periodic and solitary waves for a quintic Benjamin-Bona-Mahony (BBM) equation with distributed delay and diffused perturbation. By transforming the corresponding traveling wave equation into a three-dimensional dynamical system and applying geometric singular perturbation theory, the existence of periodic and solitary waves are established. The uniqueness of periodic waves and the monotonicity of wave speed are also analyzed.
PHYSICA D-NONLINEAR PHENOMENA
(2024)
Article
Mathematics, Applied
Wangbo Luo, Yanxiang Zhao
Summary: We propose a generalized Ohta-Kawasaki model to study the nonlocal effect on pattern formation in binary systems with long-range interactions. In the 1D case, the model displays similar bubble patterns as the standard model, but Fourier analysis reveals that the optimal number of bubbles for the generalized model may have an upper bound.
PHYSICA D-NONLINEAR PHENOMENA
(2024)
Article
Mathematics, Applied
Corentin Correia, Ana Cristina Moreira Freitas, Jorge Milhazes Freitas
Summary: The emergence of clustering of rare events is due to periodicity, where fast returns to target sets lead to a bulk of high observations. In this research, we explore the potential of a new mechanism to create clustering of rare events by linking observable functions to a finite number of points belonging to the same orbit. We show that with the right choice of system and observable, any given cluster size distribution can be obtained.
PHYSICA D-NONLINEAR PHENOMENA
(2024)
Article
Mathematics, Applied
Enyu Fan, Changpin Li
Summary: This paper numerically studies the Allen-Cahn equations with different kinds of time fractional derivatives and investigates the influences of time derivatives on the solutions of the considered models.
PHYSICA D-NONLINEAR PHENOMENA
(2024)
Article
Mathematics, Applied
Yuhang Zhu, Yinghao Zhao, Chaolin Song, Zeyu Wang
Summary: In this study, a novel approach called Time-Variant Reliability Updating (TVRU) is proposed, which integrates Kriging-based time-dependent reliability with parallel learning. This method enhances risk assessment in complex systems, showcasing exceptional efficiency and accuracy.
PHYSICA D-NONLINEAR PHENOMENA
(2024)
Article
Mathematics, Applied
Chiara Cecilia Maiocchi, Valerio Lucarini, Andrey Gritsun, Yuzuru Sato
Summary: The predictability of weather and climate is influenced by the state-dependent nature of atmospheric systems. The presence of special atmospheric states, such as blockings, is associated with anomalous instability. Chaotic systems, like the attractor of the Lorenz '96 model, exhibit heterogeneity in their dynamical properties, including the number of unstable dimensions. The variability of unstable dimensions is linked to the presence of finite-time Lyapunov exponents that fluctuate around zero. These findings have implications for understanding the structural stability and behavior modeling of high-dimensional chaotic systems.
PHYSICA D-NONLINEAR PHENOMENA
(2024)
Article
Mathematics, Applied
Christian Klein, Goksu Oruc
Summary: A numerical study on the fractional Camassa-Holm equations is conducted to construct smooth solitary waves and investigate their stability. The long-time behavior of solutions for general localized initial data from the Schwartz class of rapidly decreasing functions is also studied. Additionally, the appearance of dispersive shock waves is explored.
PHYSICA D-NONLINEAR PHENOMENA
(2024)
Article
Mathematics, Applied
Vasily E. Tarasov
Summary: This paper extends the standard action principle and the first Noether theorem to consider the general form of nonlocality in time and describes dissipative and non-Lagrangian nonlinear systems. The general fractional calculus is used to handle a wide class of nonlocalities in time compared to the usual fractional calculus. The nonlocality is described by a pair of operator kernels belonging to the Luchko set. The non-holonomic variation equations of the Sedov type are used to describe the motion equations of a wide class of dissipative and non-Lagrangian systems. Additionally, the equations of motion are considered not only with general fractional derivatives but also with general fractional integrals. An application example is presented.
PHYSICA D-NONLINEAR PHENOMENA
(2024)