Simulation of 3d larynges with asymmetric distribution of viscoelastic properties in their vocal folds

Here 3D larynx models whose viscoelastic properties of the superficial tissues of the true vocal folds were altered in specific regions at the glottis producing different left-right fold asymmetries are analyzed. The idea is to initiate studies about the dynamic of larynges under possible pathological conditions. All simulations used a strategy based on the finite element method to solve a fluid-structure interaction (airflow in the larynx) with a contact-impact problem (glottal closure). The results show that glottal closure is directly influenced by the presence and location of a stiffer mass in the surface of one of the vocal folds. Changes in glottal signal F0 (up to +13.7Hz), open quotient (up to 0.5812), and relative jitter (up to 15.2381%) were observed and are discussed here.