Examining the Quasi-Steady Airflow Assumption in Irregular Vocal Fold Vibration

Xiaojian Wang; Xudong Zheng; Ingo R. Titze; Anil Palaparthi; Qian Xue

doi:10.3390/app132312691

Back

Examining the Quasi-Steady Airflow Assumption in Irregular Vocal Fold Vibration

Journal article

Open access

Peer reviewed

Examining the Quasi-Steady Airflow Assumption in Irregular Vocal Fold Vibration

Xiaojian Wang, Xudong Zheng, Ingo R. Titze, Anil Palaparthi and Qian Xue

Applied sciences, Vol.13(23), p.12691

12/01/2023

DOI: 10.3390/app132312691

PMCID: PMC13001722

PMID: 41869000

Files and links (1)

url

https://doi.org/10.3390/app132312691View

Published (Version of record) Open Access

Abstract

The quasi-steady flow assumption (QSFA) is commonly used in the field of biomechanics of phonation. It approximates time-varying glottal flow with steady flow solutions based on frozen glottal shapes, ignoring unsteady flow behaviors and vocal fold motion. This study examined the limitations of QSFA in human phonation using numerical methods by considering factors of phonation frequency, air inertance in the vocal tract, and irregular glottal shapes. Two sets of irregular glottal shapes were examined through dynamic, pseudo-static, and quasi-steady simulations. The differences between dynamic and quasi-steady/pseudo-static simulations were measured for glottal flow rate, glottal wall pressure, and sound spectrum to evaluate the validity of QSFA. The results show that errors in glottal flow rate and wall pressure predicted by QSFA were small at 100 Hz but significant at 500 Hz due to growing flow unsteadiness. Air inertia in the vocal tract worsened predictions when interacting with unsteady glottal flow. Flow unsteadiness also influenced the harmonic energy ratio, which is perceptually important. The effects of glottal shape and glottal wall motion on the validity of QSFA were found to be insignificant.

Chemistry

Chemistry, Multidisciplinary

Engineering

Engineering, Multidisciplinary

Materials Science

Materials Science, Multidisciplinary

Physical Sciences

Physics

Physics, Applied

Science & Technology

Technology

Details

Title: Subtitle: Examining the Quasi-Steady Airflow Assumption in Irregular Vocal Fold Vibration
Creators: Xiaojian Wang - University of Maine
Xudong Zheng - University of Maine
Ingo R. Titze - University of Utah
Anil Palaparthi - University of Utah
Qian Xue - University of Maine
Resource Type: Journal article
Publication Details: Applied sciences, Vol.13(23), p.12691
DOI: 10.3390/app132312691
PMID: 41869000
PMCID: PMC13001722
NLM abbreviation: Appl Sci (Basel)
ISSN: 2076-3417
eISSN: 2076-3417
Publisher: Mdpi
Number of pages: 17
Grant note: National Institute on Deafness and Other Communication Disorders (NIDCD); United States Department of Health & Human Services; National Institutes of Health (NIH) - USA; NIH National Institute on Deafness & Other Communication Disorders (NIDCD)
Language: English
Date published: 12/01/2023
Academic Unit: School of Music; Communication Sciences and Disorders
Record Identifier: 9984719573302771

Metrics

13 Record Views

1 Times Cited - Web of Science