000003264 001__ 3264
000003264 005__ 20141118153405.0
000003264 04107 $$acze
000003264 046__ $$k2005-05-09
000003264 100__ $$aDušek, D.
000003264 24500 $$aInfluence of middle ear cavity wall absorption on mechanics of hearing

000003264 24630 $$n11.$$pENGINEERING MECHANICS 2005
000003264 260__ $$bInstitute of Thermomechanics AS CR, v.v.i., Brno
000003264 506__ $$arestricted
000003264 520__ $$2eng$$aImpedance and wall absorption are important characteristics of acoustical systems. Unlike the electrical case, no convenient commercial system is available for acoustical impedance measurement. Reasons for this lack include the unavailability of low distortion acoustic sources, the unavailability of precisely calibrated acoustic sources, and the complications introduced by the wave-like nature of sound (due to the relatively slow sound speed). Therefore it is an absence of serious experimental data of eardrum acoustic impedance or ear cavity wall impedance. In this paper we shall discuss an application of mathematical modelling for the determination of an interval of possible impedance values. The modelling used here is based on final element method (system Ansys 7.1), the complete mechanical model of human ear. From the point of view of acoustic energy transmission are taken in account the acoustic subsystem of the external auditory canal, the elastic structure of the tympanic membrane, the middle ear cavity acoustic subsystem, the stiff ear ossicle chain with moveable joints, the coupling of individual ossicles to the walls of middle ear cavity via ligaments and muscles and the coupling of stapes footplate to oval window (the enter of cochlea).

000003264 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000003264 653__ $$a

000003264 7112_ $$aENGINEERING MECHANICS 2005$$cSvratka (CZ)$$d2005-05-09 / 2005-05-12$$gEM2005
000003264 720__ $$aDušek, D.$$iPellant, K.
000003264 8560_ $$ffischerc@itam.cas.cz
000003264 8564_ $$s545703$$uhttps://invenio.itam.cas.cz/record/3264/files/Dusek-PT.pdf$$y
             Original version of the author's contribution as presented on CD, .
            
000003264 962__ $$r3238
000003264 980__ $$aPAPER