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Бифуркации удвоения периода и эффекты шумового воздействия в мультистабильной автоколебательной среде

Бифуркации удвоения периода и эффекты шумового воздействия в мультистабильной автоколебательной среде

Abstract

The model of a self-oscillatory medium composed from the elements with complex self-oscillatory behavior is studied. Under periodic boundary conditions the stable self-oscillatory regimes in the form of traveling waves with different phase shifts are coexisted in medium. The study of mechanisms of the oscillations period doubling in time is performed for different coexisted modes. For all observed spatially-non-uniform regimes (traveling waves) the period doubling occurs through the appearance of time-quasiperiodic oscillations and their further evolution. The period doubling result in multistability development. For each mode with the given phase shift the different stable non-uniform structures, which are differed by the distribution of oscillations characteristics in space, emerge. The influence of a noise signal leads to the shift of doubling bifurcation in the direction of the control parameter increasing. When the value of control parameter is fixed the stochastic bifurcations of contingency, which are shown in reduction of extremes numbers in the probabilistic distribution, are observed with the increasing of noise intensity. When the noise is sufficiently great the spatially-non-uniform modes corresponding to nonzero phase shifts disappear.

Исследуется модель автоколебательной среды, составленной из элементов со сложным автоколебательным поведением. При периодических граничных условиях в среде сосуществуют устойчивые автоколебательные режимы в виде бегущих волн с различным сдвигом фазы на длине системы. Проведено исследование механизмов удвоения периода колебаний во времени для различных сосуществующих режимов. Для всех наблюдавшихся пространственно-неоднородных режимов (бегущих волн) удвоение периода происходит через возникновение квазипериодических во времени колебаний и дальнейшую их эволюцию. Удвоения периода ведут к развитию мультистабильности. Для каждой моды с заданным сдвигом фазы на длине системы возникают разные устойчивые неоднородные структуры, отличающиеся распределением характеристик колебаний в пространстве. Воздействие шумового сигнала приводит к сдвигу бифуркаций удвоения в сторону роста управляющего параметра. При фиксированном значении параметра с ростом интенсивности шума наблюдаются стохастические бифуркации связанности, проявляющиеся в уменьшении числа экстремумов вероятностного распределения. При достаточно сильном шуме происходит исчезновение пространственно-неоднородных режимов, соответствующих ненулевым фазовым сдвигам.

Keywords

АВТОКОЛЕБАТЕЛЬНАЯ СРЕДА, МУЛЬТИСТАБИЛЬНОСТЬ, УДВОЕНИЕ ПЕРИОДА, ПРОСТРАНСТВЕННЫЕ СТРУКТУРЫ, СТОХАСТИЧЕСКАЯ БИФУРКАЦИЯ, P-БИФУРКАЦИЯ, ШУМ

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
0
Average
Average
Average
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