Finite-Element Modelling of the Response of the Gerbil Middle Ear to Sound.

摘要: We present a finite-element model of the gerbil middle ear that, using set baseline parameters based primarily on priori estimates from literature, generates responses that are comparable with we measured in vivo multi-point vibrometry and those by other groups. investigated similarity numerous features (umbo, pars-flaccida pars-tensa displacement magnitudes, resonance frequency break-up frequency, etc.) experimental corresponding ones responses, as opposed to simply computing frequency-by-frequency differences between responses. The umbo response is within range variability seen data terms low-frequency (i.e., well below middle-ear resonance) magnitude phase, main magnitude, roll-off slope irregularities above but somewhat high for frequencies frequency. At low frequencies, ossicular axis rotation appears correspond anatomical behaviour more complex at break-up). pars tensa similar what observed experimentally phases, spatial vibration pattern, bandwidths high-frequency features. A sensitivity analysis showed have strongest effects results Young’s modulus, thickness density tensa; modulus stapedial annular ligament; malleus. Displacements tympanic membrane manubrium stapes did not show large changes when material properties incus, stapes, incudomallear joint, incudostapedial posterior incudal ligament were changed ±10 % their values parameter set.