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arXiv physics/0506026physics.flu-dynnlin.PS
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法拉第波的参量自共振

Parametric Autoresonance in Faraday waves

Michael Assaf, Baruch Meerson

摘要:

本文提出了一种弱非线性驻重力波的参数激励理论。我们表明,通过使用负啁啾,可以激发一个稳定增长的波通过参数自共振。采用平均法导出了主模态的控制方程。这些方程求解解析和数值,典型的初始条件下,无粘和弱粘性流体。结果表明,当通过共振,捕获到共振总是发生时,啁啾率是足够小的。在不同的初始条件下,发现了自谐振发生的临界啁啾率。自共振激励预计终止在大幅度,当底层的恒定频率系统不再表现出一个非平凡的稳定的固定点。

英文摘要:

We develop a theory of parametric excitation of weakly nonlinear standing gravity waves in a tank, which is under vertical vibrations with a slowly time-dependent ("chirped") vibration frequency. We show that, by using a negative chirp, one can excite a steadily growing wave via parametric autoresonance. The method of averaging is employed to derive the governing equations for the primary mode. These equations are solved analytically and numerically, for typical initial conditions, for both inviscid and weakly viscous fluids. It is shown that, when passing through resonance, capture into resonance always occurs when the chirp rate is sufficiently small. The critical chirp rate, above which breakdown of autoresonance occurs, is found for different initial conditions. The autoresonance excitation is expected to terminate at large amplitudes, when the underlying constant-frequency system ceases to exhibit a non-trivial stable fixed point.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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