Design and Evaluation Methods for Optimizing Ejection Seat Cushions for Comfort and Safety
Final rept. Jul 1967-Jun 1968
FROST ENGINEERING DEVELOPMENT CORP ENGLEWOOD CO
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Two kinds of cushions, passive and inflatable, were developed using analytic and empirical optimization procedures to enhance both comfort and safety. Comfort tests were run on a series of polyurethane foams, an inflatable seat cushion, and two operational seat cushions. Load-deflection and damping coefficient data were also obtained. Results of the tests showed that comfort increases as cushion thickness or inflation pressure increases. Analog computer results using a single-degree-of-freedom model of the human body demonstrated an increasing overshoot with increasing thickness or inflation pressure except for low density polyurethane foam. Optimization curves for comfort versus dynamic overshoot were generated and used in the design of the optimized cushions.