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Related Experiment Video

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Investigating the Three-dimensional Flow Separation Induced by a Model Vocal Fold Polyp

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Published on: February 3, 2014

Dynamics of temporal variations in phonatory flow.

Michael H Krane¹, Michael Barry, Timothy Wei

¹Applied Research Laboratory, Pennsylvania State University, University Park, Pennsylvania 16804, USA. mhk5@only.arl.psu.edu

The Journal of the Acoustical Society of America

|July 24, 2010

Summary

This summary is machine-generated.

This study reveals that phonatory airflow is dynamic, not steady. Neglecting unsteady acceleration and glottal jet dynamics during voice production leads to inaccurate models, especially in later phonation stages.

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Area of Science:

Acoustics
Fluid Dynamics
Biomechanics

Background:

The quasisteady phonatory flow assumption often overlooks time variations in airflow.
Previous research relied on glottal impedance measurements, limiting dynamic analysis.
Understanding airflow dynamics is crucial for accurate voice production models.

Purpose of the Study:

To investigate the dynamic relevance of time-varying phonatory airflow.
To estimate unsteady and convective acceleration terms using velocity field measurements.
To determine the conditions under which phonatory flow is inherently unsteady.

Main Methods:

Utilized spatially and temporally resolved velocity field measurements.
Estimated unsteady and convective acceleration terms in the unsteady Bernoulli equation.
Analyzed acceleration waveforms derived from experimental data.

Main Results:

Unsteady and convective accelerations are of the same order of magnitude throughout the phonation cycle.
Glottal jet flow significantly contributes to unsteady acceleration.
Jet inertia is negligible mid-cycle due to opposing accelerations, but crucial in later stages.

Conclusions:

Phonatory airflow is inherently unsteady, contrary to quasisteady assumptions.
Unsteady acceleration is critical during the final phonation stages, impacting voice power and spectral content.
Glottal jet dynamics must be incorporated into phonatory airflow models.