Experimental flow study of modeled regular and irregular glottal closure types

Kirmse, Clemens; Triep, Michael; Brücker, Christoph; Döllinger, Michael; Stingl, Michael

doi:10.3109/14015431003667652

Cited by 6 publications

(6 citation statements)

References 4 publications

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“…Optimization techniques were used to define cam geometries that yielded four different glottal closure types of interest (convex, concave, rectangular, and triangular). Kirmse et al [69] used different configurations of these cam geometries, including asymmetric driving functions, to explore the glottal jet in regular and pathological cases.…”

Section: Externally-driven Modelsmentioning

confidence: 99%

In Vitro Experimental Investigation of Voice Production

Kniesburges

Thomson²,

Barney³

et al. 2011

CBIO

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The process of human phonation involves a complex interaction between the physical domains of structural dynamics, fluid flow, and acoustic sound production and radiation. Given the high degree of nonlinearity of these processes, even small anatomical or physiological disturbances can significantly affect the voice signal. In the worst cases, patients can lose their voice and hence the normal mode of speech communication. To improve medical therapies and surgical techniques it is very important to understand better the physics of the human phonation process. Due to the limited experimental access to the human larynx, alternative strategies, including artificial vocal folds, have been developed. The following review gives an overview of experimental investigations of artificial vocal folds within the last 30 years. The models are sorted into three groups: static models, externally driven models, and self-oscillating models. The focus is on the different models of the human vocal folds and on the ways in which they have been applied.

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Section: Externally-driven Modelsmentioning

confidence: 99%

In Vitro Experimental Investigation of Voice Production

Kniesburges

Thomson²,

Barney³

et al. 2011

CBIO

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“…Besides excised larynges, synthetic vocal fold models with silicone vocal folds were carried out with the focus on the glottal insufficiency (Park and Mongeau, 2008;Kirmse et al, 2010;Kniesburges et al, 2013Kniesburges et al, , 2016. Pickup and Thomson (2009) and Zhang et al (2012) investigated asymmetric vocal fold oscillations with a silicone model.…”

Section: Introductionmentioning

confidence: 99%

“…Pickup and Thomson (2009) and Zhang et al (2012) investigated asymmetric vocal fold oscillations with a silicone model. Such models can mimic specific physiological and disordered motion patterns of the vocal folds for which they have been developed for and are therefore well-established in voice science (Zhang et al, 2004;Thomson et al, 2005;Park and Mongeau, 2008;Kirmse et al, 2010;Murray and Thomson, 2012;Kniesburges et al, 2013Kniesburges et al, , 2016Van Hirtum and Pelorson, 2017;Motie-Shirazi et al, 2019;Taylor et al, 2019;Romero et al, 2020). However, both ex vivo and synthetic larynx models are restricted regarding the spatial resolution of the measuring data of fluid flow, the vocal fold dynamics, and their interaction.…”

Section: Introductionmentioning

confidence: 99%

3D-FV-FE Aeroacoustic Larynx Model for Investigation of Functional Based Voice Disorders

et al. 2021

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For the clinical analysis of underlying mechanisms of voice disorders, we developed a numerical aeroacoustic larynx model, called simVoice, that mimics commonly observed functional laryngeal disorders as glottal insufficiency and vibrational left-right asymmetries. The model is a combination of the Finite Volume (FV) CFD solver Star-CCM+ and the Finite Element (FE) aeroacoustic solver CFS++. simVoice models turbulence using Large Eddy Simulations (LES) and the acoustic wave propagation with the perturbed convective wave equation (PCWE). Its geometry corresponds to a simplified larynx and a vocal tract model representing the vowel /a/. The oscillations of the vocal folds are externally driven. In total, 10 configurations with different degrees of functional-based disorders were simulated and analyzed. The energy transfer between the glottal airflow and the vocal folds decreases with an increasing glottal insufficiency and potentially reflects the higher effort during speech for patients being concerned. This loss of energy transfer may also have an essential influence on the quality of the sound signal as expressed by decreasing sound pressure level (SPL), Cepstral Peak Prominence (CPP), and Vocal Efficiency (VE). Asymmetry in the vocal fold oscillations also reduces the quality of the sound signal. However, simVoice confirmed previous clinical and experimental observations that a high level of glottal insufficiency worsens the acoustic signal quality more than oscillatory left-right asymmetry. Both symptoms in combination will further reduce the quality of the sound signal. In summary, simVoice allows for detailed analysis of the origins of disordered voice production and hence fosters the further understanding of laryngeal physiology, including occurring dependencies. A current walltime of 10 h/cycle is, with a prospective increase in computing power, auspicious for a future clinical use of simVoice.

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“…Some authors have reported that the sound produced by the larynx is nonlinear [29] [31]- [34], which means that the phonation cycle loses its regularity when subglottic pressure is higher than the optimal phonation pressure [29]. The non-periodicity of speech cycles may be caused by the nonlinearity of the system assigned to the Coanda effect [30] [35]- [37], as well as to the presence of vortices in the glottic region [38]- [40] and in the supraglottic region [33] [38] [40]- [42]. Increased airflow increases these effects [36] [41]- [43].…”

Section: Discussionmentioning

confidence: 99%

Comparison of Tongue and Lip Trills with Phonation of the Sustained Vowel /<i>ε</i>/ Regarding the Periodicity of the Electroglottographic Waveform and the Amplitude of the Electroglottographic Signal

Cordeiro¹,

Montagnoli²,

Ubrig³

et al. 2015

OJA

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Aim: The aim is to compare the vocal fold vibration seen during lip and tongue trills with that seen during phonation of the sustained vowel /ε/, in terms of the periodicity of the EGG waveform and the amplitude of the EGG signal, in professional voice users. Study design: This was a quasi-experimental study. Methods: We used electroglottography (EGG) to compare the vocal fold vibration seen during tongue and lip trills with that seen during phonation of the sustained vowel /ε/, in terms of the EGG waveform periodicity and signal amplitude, in 10 classically trained, professional singers. The participants produced the sustained vowel /ε/ and performed tongue and lip trills at the same frequency and intensity. The periodicity of the waveform and the amplitude of the signal were visually analyzed by three blinded, experienced readers. To confirm the visual analysis results, we measured the jitter and shimmer of the signal and the frequency of variation in vocal fold vibration during the trill exercises. Results: The EGG waveform was classified as periodic for the sustained vowel phonation task and as quasi-periodic for the trill exercises, the vibration pattern repeating at approximately 24 Hz. Conclusion: The vibration of the vocal folds was modified according to the supraglottic movement in trills exercises.

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Experimental flow study of modeled regular and irregular glottal closure types

Cited by 6 publications

References 4 publications

In Vitro Experimental Investigation of Voice Production

In Vitro Experimental Investigation of Voice Production

3D-FV-FE Aeroacoustic Larynx Model for Investigation of Functional Based Voice Disorders

Comparison of Tongue and Lip Trills with Phonation of the Sustained Vowel /<i>ε</i>/ Regarding the Periodicity of the Electroglottographic Waveform and the Amplitude of the Electroglottographic Signal

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Experimental flow study of modeled regular and irregular glottal closure types

Cited by 6 publications

References 4 publications

In Vitro Experimental Investigation of Voice Production

In Vitro Experimental Investigation of Voice Production

3D-FV-FE Aeroacoustic Larynx Model for Investigation of Functional Based Voice Disorders

Comparison of Tongue and Lip Trills with Phonation of the Sustained Vowel /&lt;i&gt;ε&lt;/i&gt;/ Regarding the Periodicity of the Electroglottographic Waveform and the Amplitude of the Electroglottographic Signal

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Comparison of Tongue and Lip Trills with Phonation of the Sustained Vowel /<i>ε</i>/ Regarding the Periodicity of the Electroglottographic Waveform and the Amplitude of the Electroglottographic Signal