Vocal fold dynamics in a synthetic self-oscillating model: Contact pressure and dissipated-energy dose

2021 ◽  
Vol 150 (1) ◽  
pp. 478-489
Author(s):  
Mohsen Motie-Shirazi ◽  
Matías Zañartu ◽  
Sean D. Peterson ◽  
Byron D. Erath
Keyword(s):  
Contact Pressure ◽  
Vocal Fold ◽  
Dissipated Energy ◽  
Vocal Fold Dynamics ◽  
Energy Dose

scholarly journals Toward Development of a Vocal Fold Contact Pressure Probe: Sensor Characterization and Validation Using Synthetic Vocal Fold Models

2019 ◽  
Vol 9 (15) ◽  
pp. 3002 ◽  
Author(s):  
Mohsen Motie-Shirazi ◽  
Matías Zañartu ◽  
Sean D. Peterson ◽  
Daryush D. Mehta ◽  
James B. Kobler ◽  
...  
Keyword(s):  
Contact Pressure ◽  
Vocal Fold ◽  
Ground Truth ◽  
Pressure Probe ◽  
Primary Role ◽  
Novel Approach ◽  
Sensor Position ◽  
Probe Sensor ◽  
Contact Pressures

Excessive vocal fold collision pressures during phonation are considered to play a primary role in the formation of benign vocal fold lesions, such as nodules. The ability to accurately and reliably acquire intraglottal pressure has the potential to provide unique insights into the pathophysiology of phonotrauma. Difficulties arise, however, in directly measuring vocal fold contact pressures due to physical intrusion from the sensor that may disrupt the contact mechanics, as well as difficulty in determining probe/sensor position relative to the contact location. These issues are quantified and addressed through the implementation of a novel approach for identifying the timing and location of vocal fold contact, and measuring intraglottal and vocal fold contact pressures via a pressure probe embedded in the wall of a hemi-laryngeal flow facility. The accuracy and sensitivity of the pressure measurements are validated against ground truth values. Application to in vivo approaches are assessed by acquiring intraglottal and VF contact pressures using a synthetic, self-oscillating vocal fold model in a hemi-laryngeal configuration, where the sensitivity of the measured intraglottal and vocal fold contact pressure relative to the sensor position is explored.

Nonlinear Vocal Fold Dynamics in a Two-Mass Model of Speech Arising From Asymmetric Intraglottal Flow

2011 ◽  
Author(s):  
Byron D. Erath ◽  
Matías Zañartu ◽  
Sean D. Peterson ◽  
Michael W. Plesniak
Keyword(s):  
Vocal Fold ◽  
Vocal Tract ◽  
Vocal Folds ◽  
Attractive Alternative ◽  
Nonlinear Phenomena ◽  
Mass Model ◽  
Sustained Oscillations ◽  
Voiced Speech ◽  
Subglottal Pressure ◽  
Vocal Fold Dynamics

Voiced speech is initiated as air is expelled from the lungs and passes through the vocal tract inciting self-sustained oscillations of the vocal folds. While various approaches exist for investigating both normal and pathological speech, the relative inaccessibility of the vocal folds make multi-mass speech models an attractive alternative. Their behavior has been benchmarked with excised larynx experiments, and they have been used as analysis tools for both normal and disordered speech, including investigations of paralysis, vocal tremor, and breathiness. However, during pathological speech, vocal fold motion is often unstructured, resulting in chaotic motion and a wealth of nonlinear phenomena. Unfortunately, current methodologies for multi-mass speech models are unable to replicate the nonlinear vocal fold behavior that often occurs in physiological diseased voice for realistic values of subglottal pressure.

Model based comparison of vocal fold dynamics between children and adults

2015 ◽  
Vol 138 (3) ◽  
pp. 1779-1779 ◽  
Author(s):  
Michael Döllinger ◽  
Denis Dubrovskiy ◽  
Eva Beck ◽  
Rita Patel
Keyword(s):  
Vocal Fold ◽  
Model Based ◽  
Vocal Fold Dynamics

The influence of epilarynx area on vocal fold dynamics

2006 ◽  
Vol 135 (5) ◽  
pp. 724-729 ◽  
Author(s):  
Michael Döllinger ◽  
David A. Berry ◽  
Douglas W. Montequin
Keyword(s):  
Vocal Fold ◽  
Vocal Fold Dynamics

Experimental Validation of Fretting Fatigue Strength and Fretting Wear Rate at Contact Surface of Turbine-Blade-Shroud Cover

2012 ◽  
Author(s):  
Kunio Asai ◽  
Takeshi Kudo ◽  
Hideo Yoda
Keyword(s):  
Fatigue Strength ◽  
Wear Rate ◽  
Contact Pressure ◽  
Contact Force ◽  
Contact Surface ◽  
Fretting Fatigue ◽  
Fretting Wear ◽  
Dissipated Energy ◽  
Normal Contact ◽  
Vibratory Load

In continuously coupled blade structures, fretting fatigue and wear have to be considered as supposed failure modes at the contact surface of the shroud cover, which is subject to steady contact pressure from centrifugal force and the vibratory load of the blade. We did unique fretting tests that modeled the structure of the shroud cover, where the vibratory load is only carried by the contact friction force, i.e., a type of friction. What was investigated in this study are fretting fatigue strength, wear rate, and friction characteristics, such as friction coefficient and slip-range of 12%-Cr steel blade material. The friction-type tests showed that fretting fatigue strength decreases with the contact pressure and a critical normal contact force exists under which fretting fatigue failure does not occur at any vibratory load. This differs from knowledge obtained through pad-type load carry tests that fretting fatigue strength decreases with the increase of contact pressure and that it almost saturates under a certain contact pressure. Our detailed observation in the friction-type tests clarified that this mechanism was the low contact pressure narrowing the contact area and a resulting high stress concentration at a local area. The fretting wear rate was explained by the dissipated energy rate per cycle obtained from the measured hysteresis loop between the relative slip range and the tangential contact force. This fretting wear rate per cycle is almost the same as the general adhesion wear rate when energy dissipation per cycle is high, and the former is smaller than the latter as the dissipated energy decreases. Finally, to prevent fretting fatigue and wear, we propose an evaluation design chart of the contact surface of the shroud cover based on our friction-type fretting tests.

scholarly journals Modeling the effects of a posterior glottal opening on vocal fold dynamics with implications for vocal hyperfunction

2014 ◽  
Vol 136 (6) ◽  
pp. 3262-3271 ◽  
Author(s):  
Matías Zañartu ◽  
Gabriel E. Galindo ◽  
Byron D. Erath ◽  
Sean D. Peterson ◽  
George R. Wodicka ◽  
...  
Keyword(s):  
Vocal Fold ◽  
Vocal Hyperfunction ◽  
Vocal Fold Dynamics

scholarly journals Effects of the Epilarynx Area on Vocal Fold Dynamics and the Primary Voice Signal

2012 ◽  
Vol 26 (3) ◽  
pp. 285-292 ◽  
Author(s):  
Michael Döllinger ◽  
David A. Berry ◽  
Georg Luegmair ◽  
Björn Hüttner ◽  
Christopher Bohr
Keyword(s):  
Vocal Fold ◽  
Voice Signal ◽  
Vocal Fold Dynamics
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