중이의 소리전달특성 유한요소해석

In this study, a finite element model of human middle ear has been developed. The FE model was verified by comparing the result with previous studies. The displacement transfer function of umbo and velocity transfer function of footplate were calculated for comparison. The geometric data of ossicles from micro CT was used in order to develop the middle ear FE model. A right side temporal bone of a Korean cadaver was used for micro CT. The 2-dimensional geometric data from the micro CT was transformed into 3-dimensional solid geometry of three ossicles such as malleus, incus and stapes and used for the finite element model of middle ear. The developed FE model includes three ossicles, tympanic membrane, ligaments and muscles. The sound transfer functions of the FE model shows good agreement with measured responses over 10 ㎑ frequency band. To identify sensitivities of middle ear function due to material property variation, several parameter studies have been fulfilled using the middle ear FE model. As a result the stiffness property of incudostapedial joint was the most influential to the middle ear sound transfer function among the parameters.