Journal article
Interpretation of biomechanical simulations of normal and chaotic vocal fold oscillations with empirical eigenfunctions
The Journal of the Acoustical Society of America, Vol.95(6), pp.3595-3604
06/01/1994
DOI: 10.1121/1.409875
PMID: 8046149
Abstract
Empirical orthogonal eigenfunctions are extracted from biomechanical simulations of normal and chaotic vocal fold oscillations. For normal phonation, two dominant empirical eigenfunctions capture the vibration patterns of the folds and exhibit a 1:1 entrainment. The eigenfunctions show some correspondence to theoretical low-order normal modes of a simplified, three-dimensional elastic continuum, and to the normal modes of a linearized two-mass model. The eigenfunctions also facilitate a physical interpretation of energy transfer mechanisms in vocal fold dynamics. Subharmonic regimes and chaotic oscillations are observed during simulations of a lax cover, in which case at least three empirical eigenfunctions are necessary to capture the resulting vocal fold oscillations. These chaotic oscillations might be understood in terms of a desynchronization of a few of the low-order modes, and may be related to mechanisms of creaky voice or vocal fry. Furthermore, some of the empirical eigenfunctions captured during complex oscillations correspond to higher-order normal modes described in earlier theoretical work. The empirical eigenfunctions may also be useful in the design of lower-order models (valid over the range for which the empirical eigenfunctions remain more or less constant), and may help facilitate bifurcation analyses of the biomechanical simulation.
Details
- Title: Subtitle
- Interpretation of biomechanical simulations of normal and chaotic vocal fold oscillations with empirical eigenfunctions
- Creators
- David A. Berry - University of IowaHanspeter Herzel - Technische Universität BerlinIngo R. Titze - University of IowaKatharina Krischer - Fritz Haber Institute of the Max Planck Society
- Resource Type
- Journal article
- Publication Details
- The Journal of the Acoustical Society of America, Vol.95(6), pp.3595-3604
- DOI
- 10.1121/1.409875
- PMID
- 8046149
- ISSN
- 0001-4966
- eISSN
- 1520-8524
- Number of pages
- 10
- Language
- English
- Date published
- 06/01/1994
- Academic Unit
- School of Music; Communication Sciences and Disorders
- Record Identifier
- 9984719738202771
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