Impact stress in a self-oscillating model of human vocal folds

0460359 - ÚT 2017 RIV IN eng J - Journal Article
Horáček, Jaromír - Bula, Vítězslav - Radolf, Vojtěch - Šidlof, Petr
Impact stress in a self-oscillating model of human vocal folds.
Journal of Vibration Engineering & Technologies. Roč. 4, č. 3 (2016), s. 183-190. ISSN 2321-3558
R&D Projects: GA ČR(CZ) GAP101/12/1306
Institutional support: RVO:61388998
Keywords : fluid-structure interaction * flutter * biomechanics of voice modeling * phonation * aeroelasticity
Subject RIV: BI - Acoustics
Impact factor: 0.259, year: 2016
http://www.tvi-in.com/Journals/journaldetail.aspx?Id=2016062811045074383592dcc719793

The present contribution discusses a measurement of impact stress in a replica of the vocal folds made of silicon rubber excited by airflow with synchronous registration of the flow-induced vocal fold vibrations using a high speed camera, measurement of the subglottal dynamic and mean air pressures and the radiated acoustic pressure. Special miniature contact sensor was used to measure the impact stress between oscillating vocal folds during collisions. The airflow coming to the 1:1 scaled model of trachea was increasing from the phonation threshold up to the airflow rate of 0,6 l/s and subglottal pressure of 2,3 kPa, which is in the range of physiologically relevant values in a normal human voice production. Depending on the flow rate the maximum contact stress, also referred to as the maximum impact stress, was measured from about 1,7 to 2,75 kPa and the vibration amplitude of the glottis, also referred to us the maximum glottal opening, was between 2 and 3,7 mm. The fundamental frequency of self-oscillations of the vocal folds was about 152 Hz. The measured impact stress corresponds to values of 0,4-3,2 kPa, which are found in human excised larynges, as well as to the values numerically simulated by the aeroelastic model of the self-sustained vocal fold oscillations with collisions.
Permanent Link: http://hdl.handle.net/11104/0260823