Accession Number : AD0773859

Title :   A Distributed Parameter Model of the Inertially Loaded Human Spine: A Finite Difference Solution.

Descriptive Note : Final rept. 1 Dec 71-1 Apr 73,


Personal Author(s) : Liu,Y. King ; Cramer,Harold J. ; von Rosenberg,Dale U.

Report Date : NOV 1973

Pagination or Media Count : 147

Abstract : The prupose of this research was the development and solutions of nonlinear continuum models of the human spinal response to impact, with emphasis on the vertical impact-pilot ejection problem. A derivation is given for a general one-dimensional continuum model of the spine considered as a curved homogenous beam and subject to the eccentric inertial loading of the human torso. A reduction to a small strain, large deflection model is made by introducing the assumptions of linear elasticity. A further reduction to a small strain, small deflection model is made by assuming small curvatures. A three parameter viscoelastic model is also treated. Methods of solution for these nonlinear dynamic models are formulated using the finite difference calculus. (Modified author abstract)

Descriptors :   *Spinal column, *Biodynamics, *Impact shock, *Finite difference theory, Mathematical models, Numerical analysis, Stresses, Acceleration, Ejection, Pilots, Computer programs

Subject Categories : Stress Physiology

Distribution Statement : APPROVED FOR PUBLIC RELEASE