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Finite Element Modelling Of Tympanic Membrane Vibrations Under Quasi Static Pressurization
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Book Synopsis Finite-element Modelling of Tympanic-membrane Vibrations Under Quasi-static Pressurization by : Sahar Choukir
Download or read book Finite-element Modelling of Tympanic-membrane Vibrations Under Quasi-static Pressurization written by Sahar Choukir and published by . This book was released on 2018 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: "Early detection of hearing loss is important so it can be addressed in a timely manner. Current newborn hearing screening methods produce high false-positive rates which are attributed to transient conditions in the external and middle ear in the first 48 hours after birth. Tympanometry (acoustical input admittance measurement in the presence of a range of quasi-static pressures) is a promising tool for characterizing middle-ear status in newborns but their response to tympanometry is not well understood. Tympanometry involves large, nonlinear deformations; viscoelastic (time-dependent) effects; and complex dynamic responses. The goal of this study is to combine these three features in a dynamic nonlinear viscoelastic model. The constitutive equation of this model is a convolution integral composed of a Mooney-Rivlin hyperelastic model and an exponential time-dependent Prony series with six time constants. Material properties are taken from previous measurements and estimates. The tympanic membrane contributes to the overall response more than other middle-ear components do and those other components are greatly simplified in this model. The tympanic membrane is assumed to be homogeneous and nearly incompressible. The loading conditions included low-amplitude sound pressures; high quasi-static pressures; and combinations of high quasi-static pressures with low- amplitude sound pressures, corresponding to those involved in tympanometry. Simulations were performed with two different finite-element solvers and we report simulated displacements and vibrations in the frequency and time domains for the different loading conditions. Results from the two finite-element solvers were compared and were similar. The simulation results were compared with measured data from experimental animals. In response to high quasi-static pressures, the model replicates the asymmetrical effects of positive and negative pressures on the displacement; the hysteresis of the displacement; and the frequency dependence of the hysteresis. The model also replicates the differences between the peak-admittance magnitudes and the pressures at which they occur for low-amplitude vibrations during negative and positive sweeps of high quasi-static pressures. Our dynamic nonlinear viscoelastic model of the middle ear permits quantitative insights into the middle ear's response to different loading conditions and will help to establish improved applications of tympanometric measurements in newborns." --
Book Synopsis Finite-element Modelling of Middle-ear Vibrations Under Quasi-static Pressurization by : Dongfang Qian
Download or read book Finite-element Modelling of Middle-ear Vibrations Under Quasi-static Pressurization written by Dongfang Qian and published by . This book was released on 2020 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: "Early identification of hearing loss is important because if untreated it can lead to delayed language development and other difficulties. Current tools for newborn hearing screening are subject to excessively high false-positive rates. Tympanometry is a promising tool for improving screening tests by evaluating the condition of the middle ear, but it is poorly understood in newborns. Tympanometry involves large deformations, non-linear responses, viscoelastic (time-dependent) effects, and complex dynamic responses, which make it hard to model. A previous gerbil finite-element model developed in our lab was the first numerical simulation of tympanometry involving the simultaneous application of large quasi-static pressures and small sound pressures, and it succeeded in replicating some features of tympanometry. However, the model involved over-simplified anatomical details of the ossicles to reduce the computational cost. The goal of this study was to improve the model by adding a representation of the incudostapedial joint and its surrounding structures.The model employed a quasi-linear visco-hyperelastic model with several time constants in a Prony series. Material properties were taken from previous models and publications. The tympanic membrane was assumed to be homogeneous and nearly incompressible. The loads, combining high quasi-static pressures with low-amplitude sound pressures, both low-frequency pure tones and wideband chirps, reflected the conditions in tympanometry. The model was verified against our previous models, and validated against data from the literature and our recent laser vibrometry data for the pressurized gerbil middle ear. The model demonstrated experimentally and clinically observed features, including hysteresis and the asymmetry in the vibration amplitude between positive and negative static pressures.This numerical model will help us gain insight into how the middle ear responds to different stimuli and thus open up new approaches to the interpretation of tympanometric measurements"--
Book Synopsis Finite Element and Boundary Methods in Structural Acoustics and Vibration by : Noureddine Atalla
Download or read book Finite Element and Boundary Methods in Structural Acoustics and Vibration written by Noureddine Atalla and published by CRC Press. This book was released on 2015-04-17 with total page 466 pages. Available in PDF, EPUB and Kindle. Book excerpt: Effectively Construct Integral Formulations Suitable for Numerical ImplementationFinite Element and Boundary Methods in Structural Acoustics and Vibration provides a unique and in-depth presentation of the finite element method (FEM) and the boundary element method (BEM) in structural acoustics and vibrations. It illustrates the principles using a
Book Synopsis Application of Finite Element Method to the Quasi-static Thermoelastic Analysis of Prestress in Multilayer Pressure Vessels by : Pushkar Narendra Tamhane
Download or read book Application of Finite Element Method to the Quasi-static Thermoelastic Analysis of Prestress in Multilayer Pressure Vessels written by Pushkar Narendra Tamhane and published by . This book was released on 1991 with total page 174 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Finite Element Applications in Vibration Problems by : Mounir M. Kamal
Download or read book Finite Element Applications in Vibration Problems written by Mounir M. Kamal and published by . This book was released on 1977 with total page 136 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Finite Element Applications in Acoustics by : Mounir M. Kamal
Download or read book Finite Element Applications in Acoustics written by Mounir M. Kamal and published by . This book was released on 1981 with total page 146 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Applied mechanics reviews written by and published by . This book was released on 1948 with total page 400 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Journal of the Acoustical Society of America by : Acoustical Society of America
Download or read book The Journal of the Acoustical Society of America written by Acoustical Society of America and published by . This book was released on 2006 with total page 988 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Mechanics of Biological Systems and Materials, Volume 6 by : Srinivasan Arjun Tekalur
Download or read book Mechanics of Biological Systems and Materials, Volume 6 written by Srinivasan Arjun Tekalur and published by Springer. This book was released on 2015-10-29 with total page 148 pages. Available in PDF, EPUB and Kindle. Book excerpt: 5thInternational Symposium on the Mechanics of Biological Systems and Materials, Volume 6 of the Proceedings of the 2015SEM Annual Conference& Exposition on Experimental and Applied Mechanics, the sixth volume of nine from the Conference, brings together contributions to this important area of research and engineering. The collection presents early findings and case studies on a wide range of areas, including: Soft Tissues Mechanics Bio-Engineering and Biomechanics Natural Materials & Bio-Inspiration Novel Techniques and Experiments in Biomechanics Tissue Engineering Cells Mechanics
Book Synopsis Biomechanics of Hearing by : John J. Rosowski
Download or read book Biomechanics of Hearing written by John J. Rosowski and published by . This book was released on 1999 with total page 104 pages. Available in PDF, EPUB and Kindle. Book excerpt: How does the structure of the ear define normal auditory function and how do pathologically and surgically induced changes in the ear structure change hearing? This volume presents the results of the Euromech Colloquium on 'Biomechanics of Hearing'. Attended by experts - engineers, physicists, audiologists - active in different fields of modern measurement techniques, modeling and simulation and microsurgery with applications to hearing. Common themes were the description of auditory function on the basis of mathematical models of the middle and inner ear and identification, i.e. the use of measurements of middle and inner ear function to evaluate the parameters of the suggested models for normal, pathological and reconstructed ears and to refine them in their structure. The collected papers point out the positive accomplishments that can be derived from quantitative multidisciplinary approaches to hearing science. This volume is indispensable reading for audiologists, physicians and hearing scientists interested in the mechanics and acoustics of the auditory periphery.
Book Synopsis Molecular, Cellular, and Tissue Engineering of the Vascular System by : Bingmei M. Fu
Download or read book Molecular, Cellular, and Tissue Engineering of the Vascular System written by Bingmei M. Fu and published by Springer. This book was released on 2018-10-12 with total page 335 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book introduces the latest research in molecular, cellular, and tissue engineering of the vascular system. Topics covered include the roles of endothelial surface glycocalyx as a mechano-sensor and transducer for blood flow, a barrier to water and solute transport across the vascular wall and to the interaction between circulating cells and the vessel wall, the roles of nuclear envelope proteins and nuclear lamina in regulating vascular functions under blood flow-induced forces, and the roles of smooth muscle cells and extracellular components in arterial vasoconstriction. Other topics covered include non-surgical vascular interventions for coronary artery diseases, genesis and mechanisms of atherosclerotic plaque microcalcifications and human abdominal aortic aneurysms, experiments and modelling for red blood cell and tumor cell movement in microcirculation, transport across the blood-brain barrier and its role in Alzheimer’s disease, mathematical models for cell survival after hyperthermia, application of hypothermia in enhancing treatment for brain and spinal cord injuries, and damage of eardrums due to blast waves. This is an ideal book for biomedical engineers and researchers, medical researchers, and students in biomedical engineering and medical sciences.
Author :American Society of Mechanical Engineers. Design Engineering Division. Vibrations Committee Publisher : ISBN 13 : Total Pages :0 pages Book Rating :4.:/5 (5 download)
Book Synopsis Finite Element Applications in Vibration Problems by : American Society of Mechanical Engineers. Design Engineering Division. Vibrations Committee
Download or read book Finite Element Applications in Vibration Problems written by American Society of Mechanical Engineers. Design Engineering Division. Vibrations Committee and published by . This book was released on 1977 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Finite Element Analysis of the Statics of and Vibrations in Axisymmetric Shells by : W. Shahla
Download or read book Finite Element Analysis of the Statics of and Vibrations in Axisymmetric Shells written by W. Shahla and published by . This book was released on 1985 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Metals Abstracts written by and published by . This book was released on 1995 with total page 1192 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :United States. National Aeronautics and Space Administration. Scientific and Technical Information Branch Publisher : ISBN 13 : Total Pages :1080 pages Book Rating :4.E/5 ( download)
Book Synopsis Japanese Science and Technology, 1983-1984 by : United States. National Aeronautics and Space Administration. Scientific and Technical Information Branch
Download or read book Japanese Science and Technology, 1983-1984 written by United States. National Aeronautics and Space Administration. Scientific and Technical Information Branch and published by . This book was released on 1985 with total page 1080 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Principles of Vibration and Sound by : Thomas D. Rossing
Download or read book Principles of Vibration and Sound written by Thomas D. Rossing and published by Springer Science & Business Media. This book was released on 2013-03-14 with total page 336 pages. Available in PDF, EPUB and Kindle. Book excerpt: An ideal text for advanced undergraduates, the book provides the foundations needed to understand the acoustics of rooms and musical instruments as well as the basics for scientists and engineers interested in noise and vibration. The new edition contains four new chapters devoted primarily to applications of acoustical principles in everyday life: Microphones and Other Transducers, Sound in Concert Halls and Studios, Sound and Noise Outdoors; and Underwater Sound.
Book Synopsis Scientific and Technical Aerospace Reports by :
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1966 with total page 1466 pages. Available in PDF, EPUB and Kindle. Book excerpt:
