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Visualization of parametric sound generation process based on wave number filtering using numerical simulation
Blekinge Institute of Technology, School of Engineering, Department of Mathematics and Natural Sciences.
2012 (English)Conference paper, (Refereed) Published
Abstract [en]

A parametric sound is generated from a nonlinear interaction of two or more intense ultrasounds at different but neighboring frequencies. The purpose of this study is to visualize the generation process of the parametric sound in a time domain using a numerical simulation. In particular, we focus on the generation of length-limited parametric sound beam, which is generated from a pair of parametric sound sources and indicates a truncated array length with a special radial beam pattern like a Mexican hat. To visualize nonlinear components, a simulated nonlinear sound wave is transformed into spatial spectra in a wave number space, and a nonlinear component such as the difference frequency sound is extracted using wave number filtering. The visualization of length-limited sound generation indicates discontinuities of wave fronts near a sound source. From the result, it is suggested that the discontinuity of wave front causes the special radial pattern of the beam with narrow width.

Place, publisher, year, edition, pages
2012.
Keyword [en]
Difference frequency, Generation process, Nonlinear components, Nonlinear interactions, Parametric sound generation, Radial patterns, Sound generation, Spatial spectra
National Category
Fluid Mechanics and Acoustics
Identifiers
URN: urn:nbn:se:bth-6927Local ID: oai:bth.se:forskinfo9D0E9E7051737A94C1257B9B004B4CF4ISBN: 978-162276465-5 (print)OAI: oai:DiVA.org:bth-6927DiVA: diva2:834482
Conference
19th International Congress on Sound and Vibration 2012, ICSV
Available from: 2013-07-01 Created: 2013-07-01 Last updated: 2015-06-30Bibliographically approved

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CiteExportLink to record
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  • apa
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  • ieee
  • modern-language-association-8th-edition
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  • de-DE
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  • en-US
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  • nn-NO
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  • Other locale
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Output format
  • html
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  • asciidoc
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