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Bistable and dynamic states of parametrically excited ultrasound in a fluid-filled cavity

In this paper we have considered the problem of parametric sound generation in an acoustic resonator flled with a fluid, taking explicitely into account the influence of the nonlinearly generated second harmonic. A simple model is presented, and its stationary solutions obtained. The main feature of these solutions is the appearance of bistable states of the fundamental field resulting from the coupling to the second harmonic. An experimental setup was designed to check the predictions of the theory. The results are consistent with the predicted values for the mode amplitudes and parametric thresholds. At higher driving values a self-modulation of the amplitudes is observed. We identify this phenomenon with a secondary instability previously reported in the frame of the theoretical model.

preprint2008arXivOpen access
Isabel Perez-ArjonaVictor J. Sanchez-MorcilloVictor Espinosa
nlin.CD
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Open access3 authors1 topic
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Isabel Perez-ArjonaVictor J. Sanchez-MorcilloVictor Espinosa

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