(WFRF:(Kellecioglu Ilhan))
Sökning: (WFRF:(Kellecioglu Ilhan)) > On direct aeroacous...
- Schickhofer, LukasKTH,Mekanik,Linné Flow Center, FLOW (författare)
On direct aeroacoustics calculations of the vocal tract
- Artikel/kapitelEngelska2019
Förlag, utgivningsår, omfång ...
- 2019-02-02
- Cham :Springer International Publishing,2019
- printrdacarrier
Nummerbeteckningar
- LIBRIS-ID:oai:DiVA.org:kth-240551
- https://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-240551URI
- https://doi.org/10.1007/978-3-030-04915-7_79DOI
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- Språk:engelska
- Sammanfattning på:engelska
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- SwePubSwePub
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Anmärkningar
- QC 20190215
- Voice production and the verbal expression through speech are crucial components of human communication. The human voice is not just conveying information directly through words, but also indirectly as paralinguistic information such as the speaker's emotional state through tonality.As such, voice is generated through a two-part process: First, a source signal is produced by the vocal folds that are pulsating the lung pressure and volumetric flow rate in a particular frequency through periodic opening and closing. Second, the vocal tract causes an attenuation or amplification of this source signal at certain frequencies depending on its specific shape. The voice generation process can therefore be described by a source-filter model with the vocal folds acting as the source and the vocal tract as an acoustic filter. Thus, we are able to produce different vowels and sounds as we manipulate the vocal tract during phonation.However, the ability to speak can be compromised due to clinical conditions affecting the opening between the vocal folds (i.e. glottis) or the vocal tract. Certain voice disorders such as partial or total vocal fold paralysis and laryngeal cancer are known to affect the source signal and its waveform considerably.Nevertheless, the actual cause-effect relations between physiological changes in the vocal tract and the acoustic pressure in the far field are unclear. In acoustics, the far field is defined as the region away from the source, where sound pressure levels follow the inverse square law and show a decrease of approximately 6 dB for each doubling of the distance from the source.An additional factor in voice production is the shedding of intraglottal vortical structures. The sound output generated by vortices becomes important in cases of incomplete glottal closure or paralysed vocal folds. In this study, the acoustic signal generated through speech is computed directly as pressure fluctuations resulting from unsteady large eddy simulations, applied to magnetic resonance imaging (MRI) data. Thus, a time-resolved solution for the acoustic pressure in the upper airways is achieved, contributing to the knowledge of cause-effect relations in phonation and opening up new therapeutic options for vocal tract and airway disorders by the use of computational fluid dynamics.
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Biuppslag (personer, institutioner, konferenser, titlar ...)
- Dahlkild, AndersKTH,Mekanik(Swepub:kth)u16fm297 (författare)
- Mihaescu, Mihai,1976-KTH,Mekanik(Swepub:kth)u1u92v2l (författare)
- KTHMekanik (creator_code:org_t)
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- Ingår i:Direct and Large-Eddy Simulation XI, ERCOFTAC SeriesCham : Springer International Publishing9783030049140
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