This paper presents a method of parameter identification for a finite-element model of the human middle ear. The parameter values are estimated using a characterization of the difference in natural frequencies and mode shapes of the tympanic membrane between the model and the specimens. Experimental results were obtained from temporal bone specimens under sound excitation (300–3,000 Hz). The first 3 modes of the tympanic membrane could be observed with a laser scanning vibrometer and were used to estimate the stiffness parameters for the orthotropic finite-element model of the eardrum. A further point of discussion is the parameter sensitivity and its implication for the identification process.

Keywords:
Finite-element model, Middle ear, Parameter estimation, Tympanic membrane, Modal analysis, Laser scanning vibrometer
1.
ANSYS Revision 5.3 Users Manual. Houston Swanson Analysis Systems.
2.
Beer HJ, Bornitz M, Drescher J, Schmidt R, Hardtke HJ, Hofmann G, Vogel U, Zahnert T, Hüttenbrink KB: Finite element modelling of the human eardrum and applications; in Hüttenbrink KB (ed): Middle Ear Mechanics in Research and Otosurgery. Proceedings of the International Workshop on Middle Ear Mechanics, Dresden, 19–22 Sept 1996. Dresden, University of Technology, 1997, pp 40–47.
3.
Békésy G von: The structure of the middle ear and the hearing of one’s own voice by bone conduction. J Acoust Soc Am 1949;21:217–232.
4.
Drescher J: FE-Modellierung und Simulation des menschlichen Trommelfells; master’s thesis, Technische Universität Dresden, Institut für Festkörpermechanik, Dresden, 1995.
5.
Eiber A, Kauf A: Berechnete Verschiebung der Mittelohrknochen unter statischer Belastung HNO 1994;42:754–759.
6.
Funnell WRJ, Laszlo CA: A critical review of experimental observations on eardrum structure and function. Otorhinolaryngology 1982;44:181–205.
7.
Goode RL, Killion M, Nakamura K, Nishihara S: New knowledge about the function of the human middle ear: Development of an improved analog model. Am J Otol 1994;15:145–154.
8.
Hudde H, Weistenhöfer C: A three-dimensional circuit model of the middle ear. Acustica 1997;83:535–549.
9.
Kirikae J: The Middle Ear. Tokyo, University of Tokyo Press, 1960.
10.
Natke HG: Einführung in Theorie und Praxis der Zeitreihen- und Modalanalyse. Braunschweig, Vieweg & Sohn, 1983.
11.
Wada H, Kobayashi T, Naganuma H, Tachizaki H: Analysis of dynamic characteristics of eardrum: Young’s modulus, thickness and damping ratio of the human eardrum. Trans JMSE 1990;56:1431–1434.
12.
Wada H, Metoki T, Kobayashi T: Analysis of dynamic behavior of human middle ear using a finite-element method. J Acoust Soc Am 1992;96:3157–3168.
13.
Williams KR, Blayney AW, Rice HJ: Middle ear mechanics as examined by the finite element method; in Hüttenbrink KB (ed): Middle Ear Mechanics in Research and Otosurgery. Proceedings of the International Workshop on Middle Ear Mechanics, Dresden, 19–22 Sept 1996. Dresden, University of Technology, 1997, pp 40–47.
1999
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