Global ETD Search

1	Finite element simulation of external ear sound fields for the optimization of eardrum related measurements Schmidt, Sebastian January 2009 (has links) Zugl.: Bochum, Univ., Diss., 2009
2	Modelling of Components of the Human Middle Ear and Simulation of Their Dynamic Behaviour Beer, Hans-Joachim, Bornitz, Matthias, Hardtke, Hans-Jürgen, Schmidt, Rolf, Hofmann, Gert, Vogel, Uwe, Zahnert, Thomas, Hüttenbrink, Karl-Bernd 03 March 2014 (has links) (PDF) In order to get a better insight into the function of the human middle ear it is necessary to simulate its dynamic behaviour by means of the finite-element method. Three-dimensional measurements of the surfaces of the tympanic membrane and of the auditory ossicles malleus, incus and stapes are carried out and geometrical models are created. On the basis of these data, finite-element models are constructed and the dynamic behaviour of the combinations tympanic membrane with malleus in its elastic suspensions and stapes with annular ligament is simulated. Natural frequencies and mode shapes are computed by modal analysis. These investigations showed that the ossicles can be treated as rigid bodies only in a restricted frequency range from 0 to 3.5 kHz. / Dieser Beitrag ist mit Zustimmung des Rechteinhabers aufgrund einer (DFG-geförderten) Allianz- bzw. Nationallizenz frei zugänglich. Modalanalyse Gehörknöchelchen Trommelfell Mittelohr Finite-Elemente-Methode Parameterschätzung Finite-element method Middle ear Ossicles Tympanic membrane Modal analysis Parameter estimation ddc:610 rvk:XA 10000
3	Identification of Parameters for the Middle Ear Model Bornitz, Matthias, Zahnert, Thomas, Hardtke, Hans-Jürgen, Hüttenbrink, Karl-Bernd 03 March 2014 (has links) (PDF) 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. / Dieser Beitrag ist mit Zustimmung des Rechteinhabers aufgrund einer (DFG-geförderten) Allianz- bzw. Nationallizenz frei zugänglich. Mittelohr Laser-Scanning-Vibrometer Finite-Elemente-Methode Parameterschätzung Trommelfell Modellanalyse Finite-element model Middle ear Parameter estimation Tympanic membrane Modal analysis Laser scanning vibrometer ddc:610 rvk:XA 10000
4	Modelling of Components of the Human Middle Ear and Simulation of Their Dynamic Behaviour Beer, Hans-Joachim, Bornitz, Matthias, Hardtke, Hans-Jürgen, Schmidt, Rolf, Hofmann, Gert, Vogel, Uwe, Zahnert, Thomas, Hüttenbrink, Karl-Bernd January 1999 (has links) In order to get a better insight into the function of the human middle ear it is necessary to simulate its dynamic behaviour by means of the finite-element method. Three-dimensional measurements of the surfaces of the tympanic membrane and of the auditory ossicles malleus, incus and stapes are carried out and geometrical models are created. On the basis of these data, finite-element models are constructed and the dynamic behaviour of the combinations tympanic membrane with malleus in its elastic suspensions and stapes with annular ligament is simulated. Natural frequencies and mode shapes are computed by modal analysis. These investigations showed that the ossicles can be treated as rigid bodies only in a restricted frequency range from 0 to 3.5 kHz. / Dieser Beitrag ist mit Zustimmung des Rechteinhabers aufgrund einer (DFG-geförderten) Allianz- bzw. Nationallizenz frei zugänglich. info:eu-repo/classification/ddc/610 ddc:610
5	Identification of Parameters for the Middle Ear Model Bornitz, Matthias, Zahnert, Thomas, Hardtke, Hans-Jürgen, Hüttenbrink, Karl-Bernd January 1999 (has links) 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. / Dieser Beitrag ist mit Zustimmung des Rechteinhabers aufgrund einer (DFG-geförderten) Allianz- bzw. Nationallizenz frei zugänglich. info:eu-repo/classification/ddc/610 ddc:610

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