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arXiv 0901.3239nlin.CDnlin.PS
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扩展一维振子阵列中时空混沌的实验研究

An experimental route to spatiotemporal chaos in an extended 1D oscillators array

M. A. Miranda, J. Burguete

摘要:

我们报告的实验证据的路线时空混沌在一个大的一维阵列的热点热对流系统。增加的驱动力,一个固定的细胞模式变得不稳定的不规则集群的混合模式,其中包括可变的时空相干性的时间依赖性的本地化模式。这些不规则的簇与基本的细胞图案共存。对应于这个同步跃迁的傅立叶谱揭示了共振三波的弱耦合。这种模式饱和形成一个独特的领域的巨大时空连贯性。当我们进一步增加驱动力,超临界分岔的时空跳动制度发生。新模式的特点是存在两个固定的集群与一个特征之字形的几何形状。傅立叶分析揭示了更强的耦合,并能够发现这种拍频现象是由基本时空频率在窄带中的分裂产生的。这两种次级不稳定性都是具有全局性和绝对性的类位相同步跃迁。远远超过这个阈值,一个新的不稳定性发生时,系统不能维持空间频率分裂,虽然时间拍仍然在这些领域。这些实验结果可以支持自然界中其他系统经历类似的聚类过程的理解。

英文摘要:

We report experimental evidence of the route to spatiotemporal chaos in a large 1D-array of hotspots in a thermoconvective system. Increasing the driving force, a stationary cellular pattern becomes unstable towards a mixed pattern of irregular clusters which consist of time-dependent localized patterns of variable spatiotemporal coherence. These irregular clusters coexist with the basic cellular pattern. The Fourier spectra corresponding to this synchronization transition reveals the weak coupling of a resonant triad. This pattern saturates with the formation of a unique domain of great spatiotemporal coherence. As we further increase the driving force, a supercritical bifurcation to a spatiotemporal beating regime takes place. The new pattern is characterized by the presence of two stationary clusters with a characteristic zig-zag geometry. The Fourier analysis reveals a stronger coupling and enables to find out that this beating phenomena is produced by the splitting of the fundamental spatiotemporal frequencies in a narrow band. Both secondary instabilities are phase-like synchronization transitions with global and absolute character. Far beyond this threshold, a new instability takes place when the system is not able to sustain the spatial frequency splitting, although the temporal beating remains inside these domains. These experimental results may support the understanding of other systems in nature undergoing similar clustering processes.

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