ARTICULATED TOTAL BODY MODEL ENHANCEMENTS. VOLUME 3: PROGRAMMER'S GUIDE

The ATB Model is used at the Armstrong Aerospace Medical Research Lab. to study human body biomechanics in various dynamic environments, especially aircraft ejection with windblast exposure. To improve the model's predicted results and capabilities, a number of modifications have been made, including the capability to have segment contact ellipsoids block the wind from other segments, an option to prescribe velocity dependent wind forces, a correction to prevent angular drift in the joints, improved contact force calculations for segment contact near a plane's edge, the capability to specify as input multi-axis angular displacements to describe the vehicle motion, a sliding joint capability and a hyperellipsoid option. Along with these major changes, a number of minor corrections and clarifications have been included to form the ATB-IV version. Volume 3, contains a complete listing of the ATB-IVprogram with designation of coding modifications from previous versions.