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TECHNICAL PAPERS

Time Frequency Characteristics of the Vibroacoustic Signal of Hydrodynamic Cavitation

[+] Author and Article Information
Yumei Wen

Education Ministry Key Lab of Optoelectronic Technology and System, College of Optoelectronic Engineering, Chongqing University, Chongqing, 400044, P.R. Chinae-mail: ymwen@cqu.edu.cn

Manus Henry

Department of Engineering Science, Oxford University, Oxford, OX1 3PJ, UKe-mail: manus.henry@eng.ox.ac.uk

J. Vib. Acoust 124(4), 469-475 (Sep 20, 2002) (7 pages) doi:10.1115/1.1500337 History: Received May 01, 2000; Revised March 01, 2002; Online September 20, 2002
Copyright © 2002 by ASME
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References

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Morozov,  V. P., 1969, “Cavitation Noise as a Train of Sound Pulses Generated at Random Times,” Sov. Phys. Acoust., 14(3), pp. 361–365.
Bajic,  and Branko,  and Keller,  Andreas,  1996, “Spectrum Normalization Method in Vibro-Acoustical Diagnostic Measurements of Hydroturbine Cavitation,” ASME J. Fluids Eng., 118, pp. 756–761.
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Figures

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The spectrum of pulse group
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Case 1: waveform of pulses with τ≥Tc=1/fc
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The temporal waveform of pulse group with interval Tc/N≤τ<Tc. (a) The temporal waveform merely from the principal lobe. (b) The complete waveform.
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The temporal waveform of pulse group with interval τ≤Tc/N
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Schematic illustration of the experimental setup
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Raw data sampled at 20 kHz and the power spectrum (a) The raw data. (b) The power spectra.
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Raw data sampled at 50 kHz and the power spectrum. (a) The raw data. (b) The power spectra.
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The spectra of noncavitation signals
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(a) The waveform details of raw data sampled at 20 kHz, (b) the waveform details of raw data sampled at 50 kHz

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