scholarly journals Wrinkling of Tympanic Membrane Under Unbalanced Pressure

2017 ◽  
Vol 84 (4) ◽  
Author(s):  
Bo Wang ◽  
Pravarsha Ghanta ◽  
Sandra Vinnikova ◽  
Siyuan Bao ◽  
Junfeng Liang ◽  
...  
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Analytical Solution ◽  
Tympanic Membrane ◽  
Middle Ear ◽  
Approximate Analytical Solution ◽  
Ritz Method ◽  
Transmission Function ◽  
Acoustic Transmission ◽  
Element Analysis

Mechanics of tympanic membrane (TM) is crucial for investigating the acoustic transmission through the ear. In this study, we studied the wrinkling behavior of tympanic membrane when it is exposed to mismatched air pressure between the ambient and the middle ear. The Rayleigh–Ritz method is adopted to analyze the critical wrinkling pressure and the fundamental eigenmode. An approximate analytical solution is obtained and validated by finite element analysis (FEA). The model will be useful in future investigations on how the wrinkling deformation of the TM alters the acoustic transmission function of the ear.

Effect of stimulation sites on the performance of electromagnetic middle ear implant: A finite element analysis

2020 ◽  
Vol 124 ◽  
pp. 103918
Author(s):  
Houguang Liu ◽  
Wenbo Wang ◽  
Yu Zhao ◽  
Jianhua Yang ◽  
Shanguo Yang ◽  
...  
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Middle Ear ◽  
Element Analysis ◽  
Middle Ear Implant

Evaluation and Repair of Cracks on Statically Loaded Beams Using Piezoelectric Actuation

2021 ◽  
Vol 11 (1) ◽  
pp. 34-49
Author(s):  
Goutam Roy ◽  
Brajesh Kumar Panigrahi ◽  
Goutam Pohit
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Ritz Method ◽  
Actuation Voltage ◽  
Piezoelectric Actuation ◽  
Cracked Beam ◽  
Element Analysis ◽  
Various Boundary Conditions ◽  
Piezoelectric Patch ◽  
Loading Patterns

In the present work, damage produced by a crack in a statically loaded beam is first evaluated. Subsequently, an attempt is made to repair the effect of the crack by attaching a piezoelectric patch to the beam as an actuator. Static analysis of PZT patched cracked beam along with rotational spring is performed using Ritz method. Subsequently, a finite element analysis is performed by using ABAQUS 6.12 to collate the analytical results. It is shown in the study that when PZT patch is subjected to external electric field, it yields a local reactive moment, which counters the crack effects. An equation is procured in order to compute the required actuation voltage for repairing of cracks. A parametric study is performed for various boundary conditions and loading patterns. It is distinctly noticed that the technique nullifies the discontinuity in slope curve which develops due to a crack.

Finite Element Analysis (FEA) of Honeycomb Sandwich Panel for Continuum Properties Evaluation and Core Height Influence on the Dynamic Behavior

2011 ◽  
Vol 326 ◽  
pp. 1-10 ◽  
Author(s):  
Hammad Rahman ◽  
Rehan Jamshed ◽  
Haris Hameed ◽  
Sajid Raza
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Analytical Solution ◽  
Vibration Analysis ◽  
Sandwich Structure ◽  
Sandwich Panel ◽  
Fe Analysis ◽  
Element Analysis ◽  
Honeycomb Sandwich ◽  
Core Height

Finite element analysis of honeycomb sandwich panel has been performed by modeling the structure through three different approaches. Continuum properties are calculated through analytical solution and verified through FE analysis of bare core. In addition to that the thickness of core has also been varied in all the three approaches in order to study its effect on vibration analysis of sandwich structure.

scholarly journals COMPUTER AIDED THREE-DIMENSIONAL RECONSTRUCTION AND MODELING OF MIDDLE EAR BIOMECHANICS BY HIGH-RESOLUTION COMPUTED TOMOGRAPHY AND FINITE ELEMENT ANALYSIS

2006 ◽  
Vol 18 (05) ◽  
pp. 214-221 ◽  
Author(s):  
CHIA-FONE LEE ◽  
PEIR-RONG CHEN ◽  
WEN-JENG LEE ◽  
JYH-HORNG CHEN ◽  
TIEN-CHEN LIU
Keyword(s):  
Computed Tomography ◽  
Finite Element Analysis ◽  
Finite Element ◽  
High Resolution ◽  
Temporal Bone ◽  
Middle Ear ◽  
Histological Section ◽  
Slice Thickness ◽  
High Resolution Computed Tomography ◽  
Element Analysis

In order to present a systematic and practical approach that uses high-resolution computed tomography (HRCT) to derive models of the middle ear for finite element analysis (FEA). This prospective study included 31 subjects with normal hearing and no previous otological disorders. Temporal bone images obtained from 15 right ears and 16 left ears were used for evaluation and reconstruction. High-resolution computed tomography of temporal bone was performed using simultaneous acquisition of 16 sections with a collimated slice thickness of 0.625 mm. All images were transferred to an Amira visualization system for 3D reconstruction. The created 3-D model was translated into two commercial modeling packages, Patran and ANSYS, for finite element analysis. The characteristic dimensions of the model were measured and compared with previous published histological section data. This result confirms that the geometric model created by the proposed method is accurate except the tympanic membrane is thicker than that of histological section method. No obvious difference in the geometrical dimension between right and left ossicles was found (p > 0.05). The 3D model created by finite element method and predicted umbo and stapes displacements are close to the bounds of the experimental curves of Nishihara's, Huber's, and Gan's data across the frequency range of 100-8000 Hz. The model includes a description of the geometry of the middle ear components, and dynamic equations of vibration. The proposed method is quick, practical, low cost and most importantly, non-invasive as compared with histological section methods.

Sign in / Sign up

Export Citation Format

Share Document