VIBRATION MODE DECOMPOSITION FROM HIGH-SPEED IMAGING OF AUTO-OSCILLATING VOCAL FOLD REPLICAS WITHOUT AND WITH VERTICAL TILTING

Annemie van Hirtum (1, 2, 3) , Xavier Pelorson (1, 2, 3) , Isao Tokuda (4)

1 LEGI - Laboratoire des Écoulements Géophysiques et Industriels [Grenoble]
2 CNRS - Centre National de la Recherche Scientifique
3 UGA - Université Grenoble Alpes
4 Ritsumeikan University

Vertical left-right level difference due to angular asymmetry characterises unilateral vocal fold paralysis. High-speed image sequences of three distinct auto-oscillating silicone vocal folds replicas are analysed simultaneously in both space and time with a dynamic vibration mode decomposition while imposing different degrees of angular asymmetry. From the modes eigenvalue spectra, it is found for all three replicas that the degree of angular asymmetry affects the decay of vibration modes. More in particular, for the assessed vocal fold replicas, increased mode decay is observed when the replica contains a stiff epithelium-like surface layer whereas it decreases otherwise. Spatial mode patterns near the glottal aperture reflect the mode order along the posterior-anterior direction and the imposed angular asymmetry reduces the spatial mode extent near the tilted vocal fold edge. Consequently, the quantified dynamic vibration mode properties, including the ones observed for higher order modes, are of potential interest for clinical studies involving high-speed vocal folds auto-oscillation imaging.

Mots clés: High-speed vibration imaging; dynamic vibration mode analysis; mechanical vocal fold replica; vertical positioning asymmetry

Domaines: Mécanique des fluides [physics.class-ph]; Acoustique [physics.class-ph]

Annemie van Hirtum, Xavier Pelorson, Isao Tokuda. VIBRATION MODE DECOMPOSITION FROM HIGH-SPEED IMAGING OF AUTO-OSCILLATING VOCAL FOLD REPLICAS WITHOUT AND WITH VERTICAL TILTING. 12th International MAVEBA workshop (International Workshop on Models and Analysis of Vocal Emissions for Biomedical Applications ), 2021, Firenze, Italy. ⟨hal-03489405⟩