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Transient Processes Near the Acoustic Threshold of Parametrically-Driven Bubble Shape Oscillations

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The nonlinear response of a gas bubble to a low frequency p pumping wave results in parametrically-generated shape oscillations above a well-defined threshold. This may be detected through insonification of the bubble by a high-frequencyi i imaging wave, leading to the scattering of signals at i ± p, i ± p/2 (corresponding to pulsation and subharmonic wall oscillation, respectively). The durations of the transient regimes of these two signals are very different. In this study the complete theory of the transient processes near the threshold of excitation of distortion modes has been derived. The growth of an instability is very slow in this domain, causing the transient processes associated with establishing steady state surface oscillations to be of very long duration.
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Document Type: Research Article

Publication date: May 1, 2001

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  • Acta Acustica united with Acustica, published together with the European Acoustics Association (EAA), is an international, peer-reviewed journal on acoustics. It publishes original articles on all subjects in the field of acoustics, such as general linear acoustics, nonlinear acoustics, macrosonics, flow acoustics, atmospheric sound, underwater sound, ultrasonics, physical acoustics, structural acoustics, noise control, active control, environmental noise, building acoustics, room acoustics, acoustic materials, acoustic signal processing, computational and numerical acoustics, hearing, audiology and psychoacoustics, speech, musical acoustics, electroacoustics, auditory quality of systems. It reports on original scientific research in acoustics and on engineering applications. The journal considers scientific papers, technical and applied papers, book reviews, short communications, doctoral thesis abstracts, etc. In irregular intervals also special issues and review articles are published.
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