Type of Document Master's Thesis Author Cotton, John Rowland URN etd-08012012-040542 Title A viscoelastic model for the response of a step change in velocity of the human otolith organs Degree Master of Science Department Engineering Mechanics Advisory Committee
Advisor Name Title Grant, John Wallace Committee Chair Schneck, Daniel J. Committee Member Swift, George W. Committee Member Keywords
Date of Defense 1989-11-15 Availability restricted AbstractThe otolith organs are housed in the inner ear and are responsible for sensing accelerations
and gravity. These inertial sensing systems are modeled in this thesis as a three
material system consisting of a rigid otoconial plate attached to the skull by a gel layer, surrounded
by a viscous endolymph fluid. The gel layer is considered to be a viscoelastic solid,
and modeled as a simple Kelvin element. The governing differential equations are derived
and nondimensionalized, yielding three nondimensional parameters: nondimensional density,
R, nondimensional viscosity, M, and nondimensional elasticity, 6. The equations are
solved using ünite difference techniques on a digital computer. By comparing the model’s
response with previous biological research, values for the nondimensional parameters are
found. The value of R is 0.75 and the value of 6 is between 0.3 and 0.075. While the value
of M is placed between 5. and 10., results indicate that to properly model the long time
response of the otolith, a single and constant value for viscosity is not feasible.
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