Vibrational dynamics of vocal folds using nonlinear normal modes

• Published in: Medical engineering & physics Vol. 35; no. 8; pp. 1079 - 1088
• Main Authors: Pinheiro, Alan P., Kerschen, Gaëtan
• Format: Journal Article Web Resource
• Language: English
• Published: England Elsevier Ltd 01.08.2013; Butterworth Heinemann
• Subjects: Adult; Algorithms; Biomechanical modeling; Computer Simulation; Energy levels; Engineering, computing & technology; Female; Gain; Humans; Ingénierie mécanique; Ingénierie, informatique & technologie; Male; Mechanical engineering; Medical; Models, Biological; Nonlinear dynamics; Nonlinear modal analysis; Nonlinear phenomena; Nonlinearity; Parameter extraction; Phonation - physiology; Radiology; Sound Spectrography - methods; Speech - physiology; Speech Production Measurement - methods; Vibration; Vocal Cords - physiology; Vocal fold vibration; Voice; Voice dynamics; Vocal fold vibration; Biomechanical modeling; Nonlinear modal analysis; Parameter extraction; Voice dynamics
• ISSN: 1350-4533; 1873-4030; 1873-4030
• DOI: 10.1016/j.medengphy.2012.11.002

Many previous works involving physical models, excised and in vivo larynges have pointed out nonlinear vibration in vocal folds during voice production. Moreover, theoretical studies involving mechanical modeling of these folds have tried to gain a profound understanding of the observed nonlinear phenomena. In this context, the present work uses the nonlinear normal mode theory to investigate the nonlinear modal behavior of 16 subjects using a two-mass mechanical modeling of the vocal folds. The free response of the conservative system at different energy levels is considered to assess the impact of the structural nonlinearity of the vocal fold tissues. The results show very interesting and complex nonlinear phenomena including frequency–energy dependence, subharmonic regimes and, in some cases, modal interactions, entrainment and bifurcations.