Search results for: Yoshisuke Ueda

Items from 1 to 11 out of 11 results

article

Grazing-induced bifurcations in impact oscillators with elastic and rigid constraints

Haibo Jiang, Antonio S.E. Chong, Yoshisuke Ueda, Marian Wiercigroch

International Journal of Mechanical Sciences > 2017 > 127 > C > 204-214

This paper investigates differences between the grazing-induced bifurcations in impact oscillators with one-sided elastic and rigid constraints by a path-following (continuation) method. The grazing bifurcations are computed and classified for both oscillators. Two-parameter smooth (period-doubling, saddle-node) and non-smooth (grazing) bifurcations are analyzed. Frequency response curves including...

article

Address

Yoshisuke Ueda

Procedia IUTAM > 2012 > 5 > Complete > 3-6

article

How a Broken Egg Attractor Has Inﬂuenced the Dynamics of My Life*

Yoshisuke Ueda

Procedia IUTAM > 2012 > 5 > Complete > 7-26

First, the Broken Egg Phenomenon (BEgg) which constitutes this symposium's starting point is presented. It was observed accidentallyinthe courseofthe author's analog computerexperimentsfora PeriodicallyForced Self-Oscillatory System, just50 years and5days ago. Then,experimental researches aregiven from another study conductedin accordance with the BEgg phenomenon which was implemented as an electronic...

article

Blue sky bifurcations caused by unstable limit cycle leading to voltage collapse in an electric power system

Hirofumi Ohta, Yoshisuke Ueda

Chaos, Solitons and Fractals: the interdisciplinary journal of Nonlinear... > 2002 > 14 > 8 > 1227-1237

Computer simulations of an electric power system have been carried out to determine the possible bifurcations which lead to voltage collapse. Depending on the value of a capacitor, three kinds of the bifurcations are observed; blue sky disappearance of a chaotic attractor, of a limit cycle (via cyclic fold), or of a stable equilibrium (via subcritical Hopf) leads to voltage collapse. It is confirmed...

article

Quasi-periodic wave and its bifurcation in coupled magneto-elastic beam system

Takashi Hikihara, Kentaro Torii, Yoshisuke Ueda

Physics Letters A > 2001 > 281 > 2-3 > 155-160

Systems that are spatially coupled generally shows complicated spatially and temporally turbulent states. The coupled magneto-elastic beam system is an experimental model which has an elastically continuous and magnetically discrete structure. In this Letter, quasi-periodic wave and its bifurcation in the coupled system are numerically discussed.

article

Emergence of a multidomain regime and spatiotemporal chaos in Gunn diodes under impact ionization conditions

Hidetaka Ito, Yoshisuke Ueda

Physics Letters A > 2001 > 280 > 5-6 > 312-317

Nonlinear spatiotemporal dynamics of carrier densities in Gunn diodes under impact ionization conditions is numerically investigated using a<space>set of model partial differential equations. Numerical results show that a multidomain regime emerges as a<space>result of the decrease in domain size caused by impact ionization, and that the spatiotemporal evolution of the domains becomes...

article

Unstable limit cycles in an electric power system and basin boundary of voltage collapse

Hirofumi Ohta, Yoshisuke Ueda

Chaos, Solitons and Fractals: the interdisciplinary journal of Nonlinear... > 2001 > 12 > 1 > 159-172

It has been reported that a saddle node bifurcation or a blue sky bifurcation causes voltage collapse in an electric power system. In these references, computer simulations are carried out with the voltage magnitude of the generator bus terminal held constant. The generator model described by differential equations of internal flux linkages allows the voltage magnitude of the generator bus terminal...

article

DYNAMICAL BEHAVIOR OF FLYWHEEL ROTOR SUSPENDED BY HYSTERETIC FORCE OF HTSC MAGNETIC BEARING

TAKASHI HIKIHARA, HITOSHI ADACHI, FRANCIS C. MOON, YOSHISUKE UEDA

Journal of Sound and Vibration > 1999 > 228 > 4 > 871-887

Recently, the application of high-Tc superconductor to a magnetic bearing has reached the second stage in some institutes and companies. The static stability of the levitation has already been established. However, the dynamic stability is still under research because the non-linear magnetic characteristics of HTSC and the permanent magnet system are not sufficiently understood. In this paper, the...

article

Global Bifurcation Caused by Unstable Limit Cycle Leading to Voltage Collapse in an Electric Power System

Hirofumi Ohta, Yoshisuke Ueda

Chaos, Solitons and Fractals: the interdisciplinary journal of Nonlinear... > 1998 > 9 > 6 > 825-843

article

Limitation of generalized delayed feedback control

Hiroyuki Nakajima, Yoshisuke Ueda

Physica D: Nonlinear Phenomena > 1998 > 111 > 1-4 > 143-150

It had been proved that the delayed feedback control (DFC) of chaos has a limitation as follows: If the linear variational equation about the target hyperbolic unstable periodic orbit (UPO) has an odd number of real characteristic multipliers greater than unity, the UPO can never be stabilized by the DFC with any value of feedback gain. We show that this limitation also holds for generalized DFCs...

article

Riddled basins of the optimal states in learning dynamical systems

Hiroyuki Nakajima, Yoshisuke Ueda

Physica D: Nonlinear Phenomena > 1996 > 99 > 1 > 35-44

A new phenomenon called riddled basin has been drawing attention of nonlinear scientists. Riddled basin is an extremely complicated domain of attraction usually accompanying invariant sets for dynamical systems driven by chaotic signal, e.g. chaotic synchronizing systems. In this paper, the optimal state of a back-propagation learning of chaotic time series is shown to have a locally riddled...

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Keywords

2.50.-R (1)
5.45.+B (1)
7.05.MH (1)
ANALOG COMPUTER SIMULATION (1)
ASYNCHRONOUS BEAT OSCILLATION (1)
BASIN (1)
BIFURCATION (1)
BIFURCATION SET (1)
BROKEN EGG ATTRACTOR (1)
CHAOS (1)
CHAOTIC OSCILLATION (1)
CONTROLLING CHAOS (1)
COUPLED MAGNETO ELASTIC BEAM (1)
DELAY DIFFERENTIAL EQUATION (1)
DELAYED FEEDBACK CONTROL (1)
DISCONTINUITY-INDUCED BIFURCATIONS (1)
DYNAMICAL SYSTEM (1)
FEEDBACK GAIN (1)
FLOQUET THEORY (1)
FREQUENCY ENTRAINMENT (1)
GRAZING BIFURCATIONS (1)
GUNN OSCILLATION (1)
HYSTERESIS (1)
IMPACT IONIZATION (1)
IMPACT OSCILLATORS (1)
LEARNING (1)
MODE LOCKING (1)
MULTIDOMAIN PATTERNS (1)
NON-SMOOTH SYSTEMS (1)
PACS (1)
PATH FOLLOWING (1)
PHASE PORTRAIT (1)
PHENOMENON OF SYNCHRONIZATION (1)
QUASI-OR ALMOST-PERIODIC OSCILLATION (1)
QUASI-PERIODIC WAVE (1)
QUENCHING (1)
SPATIOTEMPORAL CHAOS (1)
STABILITY (1)
TORUS DOUBLING (1)
[PHYSICAL ASTRONOMY CLASSIFICATION SCHEME] 02.50-R (1)
[PHYSICAL ASTRONOMY CLASSIFICATION SCHEME] 05.45.+B (1)
[PHYSICAL ASTRONOMY CLASSIFICATION SCHEME] 07.05.MH (1)
[PHYSICAL ASTRONOMY CLASSIFICATION SCHEME] 43.25.RQ (1)
[PHYSICAL ASTRONOMY CLASSIFICATION SCHEME] 46.30.MY (1)
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