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Acoustic perturbation equations and Lighthill's acoustic analogy for the human phonation
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SYSNO ASEP 0394350 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Ostatní články Title Acoustic perturbation equations and Lighthill's acoustic analogy for the human phonation Author(s) Zoerner, S. (AT)
Šidlof, Petr (UT-L) RID
Huppe, A. (AT)
Kaltenbacher, M. (AT)Source Title Proceedings of Meetings on Acoustics -ICA 2013, 19. - Montreal : Acoustical Society of America, 2013 - ISSN 1939-800X
Roč. 19, 060309 (2013), s. 1-8Number of pages 8 s. Publication form Online - E Action ICA 2013 - Meetings on Acoustics Event date 02.06.2013-07.06.2013 VEvent location Montreal Country CA - Canada Event type WRD Language eng - English Country CA - Canada Keywords vocal folds ; CFD ; computational aeroacoustics Subject RIV BI - Acoustics R&D Projects GAP101/11/0207 GA ČR - Czech Science Foundation (CSF) Institutional support UT-L - RVO:61388998 DOI 10.1121/1.4799392 Annotation In speech, air is driven through the larynx by compression of the lungs. Thereby, air flows through the glottis which forces the vocal folds to oscillate which in turn results in a pulsating air flow. This air flow is the main source of the generated sound-the phonation. The acoustic wave then passes through the vocal tract, which acts as a filter modulating the propagated sound leaving the mouth. We model the fluid-structureacoustic interaction with a so called hybrid approach. The air flow in the larynx, together with a prescribed vocal fold motion, is simulated with help of the open source solver OpenFOAM. Based on the resulting fluid field, acoustic source terms and the wave propagation is calculated within the finite element solver CFS++. Two methods are available to choose from, Lighthill's acoustic analogy and an aeroacoustic analogy based on a perturbation ansatz. Additionally, the simulation domain is extended by a realistic but geometrical fixed vocal tract and connected to a propagation region. The different acoustic approaches are compared, by analysing the acoustic pressure in the glottis (source region) and outside the vocal tract. Moreover, to illustrate the effects of the vocal tract an alternative geometry is used for comparison. Workplace Institute of Thermomechanics Contact Marie Kajprová, kajprova@it.cas.cz, Tel.: 266 053 154 ; Jana Lahovská, jaja@it.cas.cz, Tel.: 266 053 823 Year of Publishing 2014
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