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May 2006

Volume 119, Issue 5, pp. 2541-3450

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Determination of the nonlinear parameter by propagating and modeling finite amplitude plane waves

F. Chavrier, C. Lafon, A. Birer, C. Barrière, X. Jacob, and D. Cathignol

J. Acoust. Soc. Am. Volume 119, Issue 5, pp. 2639-2644 (2006); (6 pages) | Cited 5 times

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The acoustic nonlinear parameter, B/A, is an important piece of data whenever high intensity pressure fields are under consideration. In this work, an alternative method is proposed to measure this parameter. First, the method involves measuring the sound velocity and nonlinear waveform distortion of a finite amplitude plane wave propagating through a medium, Butanediol, whose density and attenuation law have been preliminarily determined. Measurements were performed in the nearfield of a piston where plane wave propagation regime exists. Impulse response of the hydrophone was determined and pressure waveforms were obtained by a convolution process. Then, the method involves modeling, in time domain and under experimental conditions, the theoretical nonlinear waveform distortion and fitting it to the experimental results by adjusting the B/A parameter. Comparative measurements were performed using the technique of parametric interaction. The respective results for the two methods (B/A = 11.0±10% and 10.9±5%) are in a good agreement despite a smaller degree of accuracy for the proposed method.
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43.25.Ba Parameters of nonlinearity of the medium
43.80.Ev Acoustical measurement methods in biological systems and media
43.25.Zx Measurement methods and instrumentation for nonlinear acoustics

Acoustical origin of rainbands in an ideal tropical hurricane

S. A. Elder

J. Acoust. Soc. Am. Volume 119, Issue 5, pp. 2645-2650 (2006); (6 pages) | Cited 1 time

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An acoustical model of hurricane rainband formation is proposed. Self-excited acoustic resonance inside the spinning eye produces strong azimuthal and radial standing waves. These modes can cause large temperature fluctuations about the dew point which are believed to be responsible for observed dry/wet bands in the outer storm disk. Distortion of standing wavefronts into spirals occurs in the transition layer region between approximately geostrophic flow inside the eyewall and irrotational flow outside. Tonal emissions from hurricane eyes should be detectable at great distances and are likely to be in a range below 0.01 Hz.
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43.25.Ts Nonlinear acoustical and dynamical systems
43.25.Cb Macrosonic propagation, finite amplitude sound; shock waves
43.28.Ra Generation of sound by fluid flow, aerodynamic sound and turbulence
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