On the Alignment of Acoustic and Coupled Mechanic-Acoustic Eigenmodes in Phonation by Supraglottal Duct Variations

Kraxberger F, Näger C, Laudato M, Sundström E, Becker S, Mihaescu M, Kniesburges S, Schoder S (2023)

Publication Type: Journal article

Publication year: 2023

Journal

Bioengineering MDPI

Book Volume: 10

Pages Range: 1369

Issue: 12

DOI: 10.3390/bioengineering10121369

Abstract

Sound generation in human phonation and the underlying fluid–structure–acoustic interaction that describes the sound production mechanism are not fully understood. A previous experimental study, with a silicone made vocal fold model connected to a straight vocal tract pipe of fixed length, showed that vibroacoustic coupling can cause a deviation in the vocal fold vibration frequency. This occurred when the fundamental frequency of the vocal fold motion was close to the lowest acoustic resonance frequency of the pipe. What is not fully understood is how the vibroacoustic coupling is influenced by a varying vocal tract length. Presuming that this effect is a pure coupling of the acoustical effects, a numerical simulation model is established based on the computation of the mechanical-acoustic eigenvalue. With varying pipe lengths, the lowest acoustic resonance frequency was adjusted in the experiments and so in the simulation setup. In doing so, the evolution of the vocal folds’ coupled eigenvalues and eigenmodes is investigated, which confirms the experimental findings. Finally, it was shown that for normal phonation conditions, the mechanical mode is the most efficient vibration pattern whenever the acoustic resonance of the pipe (lowest formant) is far away from the vocal folds’ vibration frequency. Whenever the lowest formant is slightly lower than the mechanical vocal fold eigenfrequency, the coupled vocal fold motion pattern at the formant frequency dominates.

Authors with CRIS profile

Christoph Näger Lehrstuhl für Strömungsmechanik Stefan Becker Lehrstuhl für Strömungsmechanik Stefan Kniesburges

Involved external institutions

Royal Institute of Technology / Kungliga Tekniska Högskolan (KTH) SE Sweden (SE) Technische Universität Graz AT Austria (AT)

How to cite

APA:

Kraxberger, F., Näger, C., Laudato, M., Sundström, E., Becker, S., Mihaescu, M.,... Schoder, S. (2023). On the Alignment of Acoustic and Coupled Mechanic-Acoustic Eigenmodes in Phonation by Supraglottal Duct Variations. Bioengineering, 10, 1369. https://dx.doi.org/10.3390/bioengineering10121369

MLA:

Kraxberger, Florian, et al. "On the Alignment of Acoustic and Coupled Mechanic-Acoustic Eigenmodes in Phonation by Supraglottal Duct Variations." Bioengineering 10 (2023): 1369.

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