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Materials 2013, 6(10), 4675-4688; doi:10.3390/ma6104675

Simulations and Measurements of Human Middle Ear Vibrations Using Multi-Body Systems and Laser-Doppler Vibrometry with the Floating Mass Transducer

1
Department of Otorhinolaryngology, Head and Neck Surgery, Klinikum rechts der Isar, Technical University Munich, Ismaninger Str. 22, Munich 81675, Germany
2
Department of Applied Sciences and Mechatronics, Munich University of Applied Sciences, Loth Str. 34, Munich 80335, Germany
*
Author to whom correspondence should be addressed.
Received: 11 July 2013 / Revised: 25 September 2013 / Accepted: 29 September 2013 / Published: 22 October 2013
(This article belongs to the Special Issue Computational Modeling and Simulation in Materials Study)
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Abstract

The transfer characteristic of the human middle ear with an applied middle ear implant (floating mass transducer) is examined computationally with a Multi-body System approach and compared with experimental results. For this purpose, the geometry of the middle ear was reconstructed from μ-computer tomography slice data and prepared for a Multi-body System simulation. The transfer function of the floating mass transducer, which is the ratio of the input voltage and the generated force, is derived based on a physical context. The numerical results obtained with the Multi-body System approach are compared with experimental results by Laser Doppler measurements of the stapes footplate velocities of five different specimens. Although slightly differing anatomical structures were used for the calculation and the measurement, a high correspondence with respect to the course of stapes footplate displacement along the frequency was found. Notably, a notch at frequencies just below 1 kHz occurred. Additionally, phase courses of stapes footplate displacements were determined computationally if possible and compared with experimental results. The examinations were undertaken to quantify stapes footplate displacements in the clinical practice of middle ear implants and, also, to develop fitting strategies on a physical basis for hearing impaired patients aided with middle ear implants.
Keywords: middle ear; μCT; Multi-body System (MBS); floating mass transducer (FMT); laser-Doppler vibrometry (LDV) middle ear; μCT; Multi-body System (MBS); floating mass transducer (FMT); laser-Doppler vibrometry (LDV)
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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MDPI and ACS Style

Böhnke, F.; Bretan, T.; Lehner, S.; Strenger, T. Simulations and Measurements of Human Middle Ear Vibrations Using Multi-Body Systems and Laser-Doppler Vibrometry with the Floating Mass Transducer. Materials 2013, 6, 4675-4688.

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