Computational interferometric description of nested flow fields

Computer graphics and theoretical descriptions of density are used to obtain computer generated flow visualizations called computational interferograms. Computational interferograms are pictorially analogous to optical interferograms, and examples showing the fringe pattern for the flow about a sharp tip cone in a supersonic air stream are presented. To ascertain the effect of unsteady behavior, local density disturbances are added to the steady state flow field. This introduces irregularities to the computational interferogram like those seen in the optical interferograms. These theoretical disturbances can be varied in geometry, density description, translated with time, and strengthened or dissipated. The accuracy of computational interferometry relies on the accuracy of the theoretical density descriptions and therefore, it provides a way of verifying existing models of flow fields, especially those containing unsteady or turbulent behavior. In addition to being a unique method of flow visualization, computational interferometry can be used to develop and modify theories or numerical solutions to both simple and complex flow fields. The presented research is a general description of this process

Calculation of Stopping Torques for Limbs Subjected to Aerodynamic Loads

Ejection from high speed aircraft during emergencies expose the limb segments of crewmembers to inertial and aerodynamic loads that can result in flail injuries. In this study, maximum joint torques necessary to stop the limb segment motion were calculated using a gross motion simulation model. A linear relationship between the restoring torque and joint flexure was assumed in the calculations. Results show that large joint torques are necessary to stop the limbs within relatively small specified angles and vice versa. The method described and the calculations made are useful in the design of limb restraint evaluation devices and dummies

Simulations of rollover tests. Final report.

National Highway Traffic Safety Administration, Washington, D.C.Mode of access: Internet.Author corporate affiliation: Air Force Armstrong Aerospace Medical Research Laboratory, Wright-Patterson AFB, OhioReport covers the period March 1984-May 1988Subject code: ENJSubject code: JCBSubject code: NT*ENSubject code: WNBJSubject code: WVIF