7th International Workshop on Models and Analysis of Vocal Emissions for Biomedical Applications (MAVEBA 2011)

Florence, Italy
August 25-27, 2011

Self-Oscillating, Multi-Layer Numerical and Artificial Vocal Fold Models with Thin Epithelial and Loose Cover Layers

Scott L. Thomson, P. R. Murray

Department of Mechanical Engineering, Brigham Young University, Provo, Utah, USA

Synthetic models are used to study vocal fold flow-induced vibration. Advantages include reproducibility and vibration frequencies typical of human phonation. Limitations of recent models include lack of a mucosal wave, excessive inferiorsuperior motion, and limited convergent-divergent motion. To overcome these limitations, a synthetic vocal fold model was developed that included separate epithelial and lamina propria layers. A corresponding finite element model was developed. High-speed imaging was used to quantify synthetic model motion, including videokymography and determination of three-dimensional marker trajectories. Both models exhibited similar characteristics in terms of vibration frequency (around 115 Hz) and maximum glottal width (just under 2 mm). The synthetic model onset pressure was 0.4 kPa, which is significantly lower than many previous synthetic models. These values are consistent with human phonation. Importantly, in both models mucosal wave-like motion was evident and alternating convergent-divergent intraglottal profiles were seen. These advantages will be useful in future experiments and simulations by providing models that exhibit more life-like response and motion. The two models are described, data are presented, significance of the models is discussed, and suggestions for future work are provided.

Index Terms. Vocal fold models, artificial models, finite element models

Full Paper (reprinted with permission from Firenze University Press)

Bibliographic reference.  Thomson, Scott L. / Murray, P. R. (2011): "Self-oscillating, multi-layer numerical and artificial vocal fold models with thin epithelial and loose cover layers", In MAVEBA-2011, 57-60.