Physical Models of an Eardrum of a Middle Ear of the Human
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Abstract
Different models of a middle ear of the human which can help to estimate his condition before and after a timpanoplastika are considered. In particular, as models of an eardrum the round, rectangular and bent membranes are offered. For an eardrum its flexibility, a tension, the first own frequency, mass of acoustical stones are defined by model of an acoustic membrane. The received results well will be coordinated with experimental data. Feature of attachment of acoustical stones to an eardrum is attachment in the area of asymmetrical to its center. Then, if the frequency of 600 Hz at which zones of fluctuations in the form of two semi-disks were observed is more than own frequency of fluctuations of a free membrane, then the line of attachment of stones coincides with the nodal line of asymmetrical fashion and such nature of zones does not demand for an explanation of the concept of the bent membrane. Shrapnel's membrane, and its role at surgical restoration of an eardrum is separately analysed. As model of all middle ear the model on the basis of electro-acoustic analogies is chosen. It allowed to receive quantitative indices of a condition of an acoustical system of the person: parameter of norm of a middle ear and coefficient of strengthening of sound pressure acoustical stones and to make recommendations about selection of materials for a timpanoplastika, and assessment of success of its carrying out.
Бібл. 10, рис. 5.
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