Simulation of the Motion of the Center of Mass of an Occupant under Ejection Accelerations
Abstract
The development of highly sophisticated and complex ejection seats to provide safe egress from aircraft during low altitude, high speed and adverse attitude ejections addresses the need for a reliable computer simulation capability to determine the trajectory of the seat and occupant under these conditions. The occupant response to increasingly severe acceleration profiles must, therefore, be addressed if the simulation model is to be able to evaluate the behavior of the seat/occupant system. Traditionally, the seat and occupant have been treated in combination as a rigid body for purposes of trajectory analysis. However, experience with ejection seat tests has demonstrated a considerable amount of relative motion between the occupant (typically an anthropomorphic dummy) and the seat itself. This report presents a lumped mass, spring-damper mathematical computer model to simulate the motion of the occupant's C.G.with respect to the seat under a dynamic ejection environment. The analysis of anthropomorphic dummy results and of computer generated biodynamic simulation data used in the evaluation of the model will be discussed. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 01, 1981
- Accession Number
- ADA113806
Entities
People
- Georg D. Frisch
- Louis A. D'aulerio
Organizations
- Naval Air Warfare Center Warminster