This book introduces a new seven-mass biomechanical model for the
mechanical vibration of vocal folds. The model is based on the
body-cover layer concept of the vocal fold biomechanics, and
segments the cover layer into three masses along the longitudinal
direction of the vocal fold. The model is used to characterize the
vocal fold dynamics of 14 human subjects with healthy and
pathological vocal folds (nodule, polyp and unilateral paralysis).
A semi-empirical procedure for tuning the model parameters is
proposed so that the model response matches as closely as possible
the experimental data obtained from high-speed videoendoscopy in
the time and frequency domains. Two factors, quantifying the
asymmetry between left and right vocal folds and anterior and
posterior segments of the vocal folds, are introduced. Based on the
value of the asymmetry factors for the 14 subjects, the 2D
asymmetry space is subdivided into four regions corresponding to
healthy vocal folds, nodule, polyp and unilateral paralysis. This
yields a clear visual aid for clinicians, correlating the model
parameters to voice quality.
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