Biomedical Engineering: Applications, Basis and CommunicationsVol. 19, No. 03, pp. 171-177 (2007) No AccessTHE OPTIMAL MAGNETIC FORCE FOR A NOVEL ACTUATOR COUPLED TO THE TYMPANIC MEMBRANE: A FINITE ELEMENT ANALYSISChia-Fone Lee, Jyh-Horng Chen, Yuan-Fang Chou and Tien-Chen LiuChia-Fone LeeInstitute of Biomedical Engineering, National Taiwan University, Taipei, TaiwanDepartment of Otolaryngology, Buddhist Tzu Chi General Hospital, Hualien, TaiwanDepartment of Medicine, Buddhist Tzu Chi University, Hualien, Taiwan Search for more papers by this author , Jyh-Horng ChenInstitute of Biomedical Engineering, National Taiwan University, Taipei, TaiwanInstitute of Electrical Engineering, College of Electrical Engineering and Computer Science, National Taiwan University, Taipei, Taiwan Search for more papers by this author , Yuan-Fang ChouInstitute of Mechanical Engineering, College of Mechanical Engineering, National Taiwan University, Taipei, Taiwan Search for more papers by this author and Tien-Chen LiuDepartment of Otolaryngology, National Taiwan University Hospital, Taipei, TaiwanCorresponding author: Dr Tien-Chen Liu, Associated Professor, Department of Otolaryngology, National Taiwan University Hospital, Taipei, Taiwan. Tel.: +886-2-2312, exts 3456, 5896; Fax: +886-2-2341, ext 0905. Search for more papers by this author https://doi.org/10.4015/S1016237207000227Cited by:3 PreviousNext AboutSectionsPDF/EPUB ToolsAdd to favoritesDownload CitationsTrack CitationsRecommend to Library ShareShare onFacebookTwitterLinked InRedditEmail AbstractA 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. References H. H. Kim and D. M. Barrs, Otolaryng Head Neck 134, 1043 (2006). Crossref, ISI, Google ScholarR. Perkins, Otolaryng Head and Neck 114, 720 (1996). 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Notable Biomedical TitlesAuthors from Harvard, Rutgers University, University College London and more! FiguresReferencesRelatedDetailsCited By 3Numerical Study and Optimization of a Novel Piezoelectric Transducer for a Round-Window Stimulating Type Middle-Ear ImplantHouguang Liu, Hehe Wang, Zhushi Rao, Jianhua Yang and Shanguo Yang9 January 2019 | Micromachines, Vol. 10, No. 1The effect of actuator and its coupling conditions on eardrum-stimulated middle ear implants: A numerical analysisDan Xu, Houguang Liu, Lei Zhou, Gang Cheng and Jianhua Yang et al.10 November 2016 | Proceedings of the Institution of Mechanical Engineers, Part H: Journal of Engineering in Medicine, Vol. 230, No. 12A novel opto-electromagnetic actuator coupled to the tympanic membraneChia-Fone Lee, Chih-Hua Shih, Jen-Fang Yu, Jyh-Horng Chen and Yuan-Fang Chou et al.1 Dec 2008 | Journal of Biomechanics, Vol. 41, No. 16 Recommended Vol. 19, No. 03 Metrics History Accepted 4 June 2007 PDF download