2026-09-20T06:44:22Z https://www.ideals.illinois.edu/oai-pmh

oai:www.ideals.illinois.edu:2142/99180 2023-07-11 col_2142_5131 col_2142_14800 com_2142_5130 com_2142_14799 com_2142_234

Open Restriction set for Item 105142 on 2019-01-22T15:34:03Z with date null by fschaef2@illinois.edu. Bodony, Daniel J. Bodony, Daniel J. Geubelle, Philippe H. Freund, Jonathan B. Sutton, Bradley P. Saurabh, Shakti 2018-03-13T15:20:59Z 2018-03-13T15:20:59Z 2017-09-19 2017-12 The generation and propagation of the human voice is studied using direct numerical simulation. A full body domain is employed for the purpose of directly computing the sound in the region past the speaker's mouth. The air in the vocal tract is modeled as a compressible and viscous fluid interacting with the vocal folds (VFs). The vocal fold tissue material properties are multi-layered, with varying stiffness, and a finite-strain model is utilized and implemented in a quadratic finite element code. The fluid-solid domains are coupled through a boundary-fitted interface and utilize a Poisson equation-based mesh deformation method. The domain includes an anatomically relevant vocal tract geometry, either in two dimensions or in three dimensions. Adult and two-year-old child anatomy inspired simulations are performed. Phonation simulations using a non-linear hyper elastic, linear elastic and viscoelastic models of the VFs are performed and compared. The sensitivity of phonation to the VF Poisson's ratio is also evaluated. Simulations are employed to investigate voice disorders related to vocal fold stiffness asymmetry and unilateral vocal fold paralysis (UVFP). Additionally, an analysis is performed for medialization laryngoplasty, a well known surgical treatment for UVFP. Phonation onset is determined from all the simulations as a measure of degree of voice disorder with phonation threshold pressure (PTP) as a key parameter for the quantification. The computational model developed is demonstrated to be consistent with prior measurements and sufficiently sensitive to be used in future studies involving VF pathologies, surgical procedures to restore voice, and/or closed loop models of voice, speech and perception. Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2019-12-01 The student, Shakti Saurabh, accepted the attached license on 2017-09-18 at 18:16. The student, Shakti Saurabh, submitted this Dissertation for approval on 2017-09-18 at 18:25. This Dissertation was approved for publication on 2017-09-19 at 14:20. DSpace SAF Submission Ingestion Package generated from Vireo submission #11651 on 2018-03-13 at 09:55:04 Made available in DSpace on 2018-03-13T15:20:59Z (GMT). No. of bitstreams: 3 SAURABH-DISSERTATION-2017.pdf: 8925844 bytes, checksum: 2148c4eb440ee763f5aaad80874449aa (MD5) LICENSE.txt: 4211 bytes, checksum: ce8263d2f5a6ddc8029e07424fe9985a (MD5) PROQUEST_LICENSE.txt: 4557 bytes, checksum: 82bb844c427bcaa99aa0bba09bfa85fb (MD5) Previous issue date: 2017-09-19 Embargo set by: Seth Robbins for item 105142 Lift date: 2020-03-13T15:21:19Z Reason: Author requested U of Illinois access only (OA after 2yrs) in Vireo ETD system Embargo set by: Seth Robbins for item 105142 Lift date: 2020-03-13T15:25:40Z Reason: Author requested U of Illinois access only (OA after 2yrs) in Vireo ETD system Embargo set by: Seth Robbins for item 105142 Lift date: 2020-03-13T15:28:52Z Reason: Author requested U of Illinois access only (OA after 2yrs) in Vireo ETD system Open Restriction set for Item 105142 on 2019-01-22T15:34:05Z with date null by fschaef2@illinois.edu. Open Restriction set for Item 105142 on 2019-01-22T15:48:38Z with date null by fschaef2@illinois.edu. Open Restriction set for Item 105142 on 2019-01-22T15:48:41Z with date null by fschaef2@illinois.edu. Open Restriction set for Item 105142 on 2019-01-22T15:48:49Z with date null by fschaef2@illinois.edu. Open Restriction set for Item 105142 on 2019-01-22T15:48:52Z with date null by fschaef2@illinois.edu. Open application/pdf http://hdl.handle.net/2142/99180 en Copyright 2017 Shakti Saurabh Vocal folds (VF) Unilateral vocal fold paralysis (UVFP) Phonation threshold pressure (PTP) Medialization laryngoplasty Fluid-structure interaction (FSI) Phonation Direct numerical simulation of human phonation text text Aerospace Engineering Aerospace Engineering University of Illinois at Urbana-Champaign Dissertation Ph.D.