The optimal magnetic force for a novel actuator coupled to the tympanic membrane: A finite element analysis
Journal
Biomedical Engineering - Applications, Basis and Communications
Journal Volume
19
Journal Issue
3
Pages
171-177
Date Issued
2007
Author(s)
Abstract
A new type of electromagnetic vibration transducer designed to be placed onto the tympanic membrane will be developed. Such an electromagnetic transducer should have the following characteristics: small in size, high-energy efficiency and suitable frequency bandwidth. In order to find out the optimal electromagnetic force and to predict the frequency-amplitude characteristics, a finite element middle ear biomechanical model was used to derive the optimal magnetic force of the actuator in this study. First, the electromagnetic transducer coupled to the ear drum was created by using a computer-aided design (CAD). Then the new coupled tympanic membrane-transducer complex was loaded to a 3-dimensional biomechanical model in the middle. The air gap between magnet and coil, input current and vibration force were calculated by finite element analysis simulation. In addition, gain and frequency response curves of the actuator were also calculated. Predicted displacement of tip of the malleus induced by the sound pressure of 80 dB SPL with different input currents are computed from the finite element model over the auditory frequency range of 100-8000 Hz as the force input into the ANSYS software. Simulated results show displacements of vibration are about 100 nm in the range from 100-1000 Hz and reduced when the frequencies are higher than 1000 Hz. Functional gains were about 20-25 dB across the 100 to 8,000 Hz frequency range. © 2007 National Taiwan University.
SDGs
Other Subjects
Actuators; Biomechanics; Computer aided design; Energy efficiency; Frequency response; Magnetic actuators; Magnetic devices; Transducers; Vibration analysis; Amplitude characteristics; Bio-mechanical models; Electromagnetic forces; Electromagnetic transducer; Electromagnetic vibrations; Frequency band width; Frequency-response curves; High energy efficiency; Finite element method; amplitude modulation; article; biomechanics; calculation; computer aided design; computer model; device; eardrum; electromagnetic actuator; finite element analysis; hearing loss; magnetic field; malleus; mathematical computing; nonhuman; prediction; sound pressure; three dimensional imaging; transducer; vibration
Publisher
World Scientific Publishing Co. Pte Ltd
Type
journal article