Initial developments of a vibration model of the human head-neck system

Author

Christopher D. Hayes

Date of Award

6-1988

Degree Type

Thesis

Degree Name

Master of Science

Major

Engineering Science

Major Professor

Jack F. Wasserman

Committee Members

Thomas G. Carley, J. A. M. Boulet

Abstract

Advances in aviation technology have lead to use of the aviator's helmet as an equipment mounting platform. Military researchers are concerned with the physiological effects and the affect to aviator performance brought about by these changes in helmet design. This thesis deals with the initial developments of a three-dimensional mathematical model which uses representative kinematic equations to describe the effects of changes in helmet weight and center-of-gravity on the human head-neck-helmet system motion in a vibratory environment.

A four degree of freedom mathematical model was developed consisting of a two pivot description connected by a system of rotational springs. The equations of motion were derived using Lagrange's equation, producing four second order, nonlinear differential equations with nonconstant coefficients. The equations were linearized by neglecting high order terms and assuming small angles.

A computer program was used to evaluate the linearized θ_H equation and to compare results to experimental physical data. The results showed that the θ_H equation reproduced the frequency responses exhibited in the physical data. Interpretation of these results was used to speculate about mechanisms governing muscle reactions due to certain loading conditions.

Recommended Citation

Hayes, Christopher D., "Initial developments of a vibration model of the human head-neck system. " Master's Thesis, University of Tennessee, 1988.
https://trace.tennessee.edu/utk_gradthes/13224