Geometry of human vocal folds and glottal channel for mathematical and biomechanical modeling of voice production

Šidlof, Petr; Švec, Jan G.; Horáček, Jaromı́r; Veselý, Ján; Klepácek, I; Havlík, Radan

doi:10.1016/j.jbiomech.2007.12.016

Cited by 37 publications

(35 citation statements)

References 29 publications

(29 reference statements)

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“…Thus the medial surface thickness in this study should be interpreted as an approximate measure of the thickness of the most constricted portion of the glottis in the flow direction. Four values of the vocal fold medial surface thickness are considered in this study, from 1 to 4.5 mm, which roughly covers the range as used in previous studies (Titze and Talkin, 1979;Alipour et al, 2000;Scherer et al, 2001;Thomson et al, 2005;Luo et al, 2009) and estimated from reported experimental data (Sidlof et al, 2008). The initial glottal angle is varied in a range between 0 and 4 , which corresponds to a resting glottal opening of 0-10.1 mm 2 .…”

Section: B Simulation Conditionsmentioning

confidence: 99%

Cause-effect relationship between vocal fold physiology and voice production in a three-dimensional phonation model

Zhang¹

2016

The Journal of the Acoustical Society of America

115

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The goal of this study is to better understand the cause-effect relation between vocal fold physiology and the resulting vibration pattern and voice acoustics. Using a three-dimensional continuum model of phonation, the effects of changes in vocal fold stiffness, medial surface thickness in the vertical direction, resting glottal opening, and subglottal pressure on vocal fold vibration and different acoustic measures are investigated. The results show that the medial surface thickness has dominant effects on the vertical phase difference between the upper and lower margins of the medial surface, closed quotient, H1-H2, and higher-order harmonics excitation. The main effects of vocal fold approximation or decreasing resting glottal opening are to lower the phonation threshold pressure, reduce noise production, and increase the fundamental frequency. Increasing subglottal pressure is primarily responsible for vocal intensity increase but also leads to significant increase in noise production and an increased fundamental frequency. Increasing AP stiffness significantly increases the fundamental frequency and slightly reduces noise production. The interaction among vocal fold thickness, stiffness, approximation, and subglottal pressure in the control of F0, vocal intensity, and voice quality is discussed.

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Section: B Simulation Conditionsmentioning

confidence: 99%

Cause-effect relationship between vocal fold physiology and voice production in a three-dimensional phonation model

Zhang¹

2016

The Journal of the Acoustical Society of America

115

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“…Of these the model depth, D (the maximum depth from the medial edge to the lateral edge), was constant and the other 13 were variable. The variable parameters were each given a low, baseline, and high value (see Table I), according to similar values found in previous reports (Stiblar-Martincic, 1997;Scherer et al, 2001a;Tayama et al, 2002;Agarwal et al, 2003;Nanayakkara, 2005;Sidlof et al, 2008). It is noted that variations in the parameters resulted in the base vertical thickness dimension (corresponding to the fixed, lateral edge length; i.e., that of the leftmost vertical edge in Fig.…”

Section: A Model Definition and Parameterizationmentioning

confidence: 53%

Identification of geometric parameters influencing the flow-induced vibration of a two-layer self-oscillating computational vocal fold model

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Thomson

2011

The Journal of the Acoustical Society of America

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Simplified models have been used to simulate and study the flow-induced vibrations of the human vocal folds. While it is clear that the models' responses are sensitive to geometry, it is not clear how and to what extent specific geometric features influence model motion. In this study geometric features that played significant roles in governing the motion of a two-layer (body-cover), two-dimensional, finite element vocal fold model were identified. The model was defined using a flow solver based on the viscous, unsteady, Navier-Stokes equations and a solid solver that allowed for large strain and deformation. A screening-type design-of-experiments approach was used to identify the relative importance of 13 geometric parameters. Five output measures were analyzed to assess the magnitude of each geometric parameter's effect on the model's motion. The measures related to frequency, glottal width, flow rate, intraglottal angle, and intraglottal phase delay. The most significant geometric parameters were those associated with the cover--primarily the pre-phonatory intraglottal angle--as well as the body inferior angle. Some models exhibited evidence of improved model motion, including mucosal wave-like motion and alternating convergent-divergent glottal profiles, although further improvements are still needed to more closely mimic human vocal fold motion.

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“…As an example, there can be used principle of myoelasto aerodynamic principle of vocal folds function presented in the literature till this time. [1][2][3][4][5][6][7][8][9][10][11][12][13][14] To complete the reliable analysis of a complex phenomenon which the source voice generation undoubtedly is and which has not been reliably resolved in the literature so far, other possible concepts of the examined effect and problem need to be sought without prejudice if possible and presented with impartiality.…”

mentioning

confidence: 99%

“…Also this is shown by a large number of authors who try to come up with at least ''a small contribution'' to help clarify the function of the vocal folds. [1][2][3][4][5][6][7][8][9][10][11][12][13][14] Then it is difficult of course to trust some articles published, which present very ''authoritative'' conclusions regarding the properties and function of the vocal folds and possible variations of this function.…”

mentioning

confidence: 99%

“…The supporters of this principle attach the crucial priority to the aerodynamic effect of a medium flowing through the vocal folds, that is, to presence of Bernoulli's effect. [1][2][3]5,[8][9][10][12][13][14] Some authors even adopt the idea that Bernoulli's effect ''forms the course of motion and shape of the vocal folds'' during their opening of the upper and closing of the lower parts.…”

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confidence: 99%

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Mišun

2012

Journal of Voice

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Geometry of human vocal folds and glottal channel for mathematical and biomechanical modeling of voice production

Cited by 37 publications

References 29 publications

Cause-effect relationship between vocal fold physiology and voice production in a three-dimensional phonation model

Cause-effect relationship between vocal fold physiology and voice production in a three-dimensional phonation model

Identification of geometric parameters influencing the flow-induced vibration of a two-layer self-oscillating computational vocal fold model

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