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Abstract:
A precise model of the cochlea and its vicinity is essential for reliable numerical simulation which could discern between different mechanisms of energy transfer to the human ear. Therefore, a significant fraction of our effort was devoted to the construction of a sufficiently detailed and anatomically faithful model of the ear (its outer, middle, and inner parts). The model we constructed consists of the following parts: (1) the outer ear represented by its exterior surface, the surface of the auditory canal including the tympanic membrane, modeled as a finite-thickness surface; (2) the middle ear, modeled as a surface of the system of ossicles and supporting structures; (3) the inner ear, modeled as a set of surfaces representing the boundaries of the cochlea, the vestibule, and the semi-circular canals; (4) the skull, described by the surface of the bone; (5) the outer surface of the skin surrounding the skull; and (6) a homogeneous material filling the space between the skull and the inner ear. For tests of noise-protection devices, we also included a model of a helmet and the material layer filling the space between the helmet and the surface of the head. We stress that all the geometry components -- skull, skin, inner ear, middle ear, outer ear, and helmet -- are mutually compatible and matched to one another. Some representative examples of the geometry details are presented in Figures 1 to 8.
| Limitations: |
 APPROVED FOR PUBLIC RELEASE |
| Description: |
Final performance rept. 1 Oct 2007-30 Nov 2009 |
| Pages: |
7 |
| Report Date: |
30 Nov 2009 |
| Contract Number: |
FA9550-08-C-0006 FA955008C0006 |
| Report Number: |
A900715 |
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