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How Acoustic Resonances Can Support Self-sustained Oscillations of Acoustic-Mechanical Dynamic System
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SYSNO ASEP 0538751 Document Type C - Proceedings Paper (int. conf.) R&D Document Type Conference Paper Title How Acoustic Resonances Can Support Self-sustained Oscillations of Acoustic-Mechanical Dynamic System Author(s) Horáček, Jaromír (UT-L) RID, ORCID
Radolf, Vojtěch (UT-L) RID, ORCID
Laukkanen, A. M. (FI)Number of authors 3 Source Title Proceedings of the 14th International conference on vibration problems. ICOVP 2019. - Singapur : Springer, 2020 - ISSN 2195-4356 - ISBN 978-981-15-8048-2 Pages s. 389-399 Number of pages 11 s. Publication form Print - P Action International conference on vibration problems. ICOVP 2019 /14./ Event date 01.09.2019 - 04.09.2019 VEvent location Hersonissos Country GR - Greece Event type WRD Language eng - English Country SG - Singapore Keywords acoustic-flow-structure interaction ; biomechanics of voice ; vocal tract acoustics ; phonation into tubes ; water resistance voice therapy ; water bubbling frequency ; formant frequencies Subject RIV BI - Acoustics OECD category Acoustics R&D Projects GA19-04477S GA ČR - Czech Science Foundation (CSF) Institutional support UT-L - RVO:61388998 EID SCOPUS 85105007625 DOI 10.1007/978-981-15-8049-9_24 Annotation Flutter instabilities of structures aremostly unwanted phenomena in technical applications excluding some energy harvesting systems that utilize wind or water flow-induced aeroelastic instabilities of the systems. Another situation is in biomechanics of voice where the flutter instability of human vocal folds is a necessary condition for singing and speaking, because flow-induced vibrations of the vocal folds create the voice source. The present experimental modelling study shows that the vocal fold self-oscillations can be strongly influenced by interaction with acoustic resonances of the human vocal tract in case when the vocal tract is prolonged by so-called resonance tube used in voice therapy methods. This influence is demonstrated by constructing the relationships of subglottal pressure (pressure drop between trachea and ambient air in front of the mouth) variation in time versus glottal area variation (opening and closing of the glottis). It is shown that a part of the airflow energy required for phonation is substituted by acoustic energy, utilizing the first acoustic resonance. 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 2021
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