CRASHWORTHINESS EVALUATION OF AN ENERGY ABSORPTION EXPERIMENTAL TROOP SEAT CONCEPT
Final technical rept.
AVIATION SAFETY ENGINEERING AND RESEARCH PHOENIX AZ
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This report is an evaluation of an experimental troop seat concept that was progressively developed and dynamically tested. The seats were installed and tested along with other equipment in four full-scale crashes of CH-21 helicopters. The designs submitted represented progressive steps in the development of a troop seat using strut-type energy attenuation. The basic concept was a single-passenger, side-facing, bucket seat. Anthropomorphic dummies, restrained by lap belts and single diagonal chest straps, were placed in the seats to provide simulated human loading characteristics during impact. Accelerometers were mounted in the pelvic cavity of the dummies to permit recording of the impact decelerations. Floor accelerations were also measured near the seat installations. Tensiometers recorded the belt forces. High-speed cameras positioned in the helicopters recorded the reaction of the dummies and experimental seats during the crash sequences. The seats were divided into two basic functional units first, a seat base incorporating an energy-absorbing strut to provide the vertical support and second, a curved nylon seat back that was designed to provide the occupant with restraint in the lateral and longitudinal directions, in addition to the restraint provided by the lap belt and chest strap. The test series demonstrated the effectiveness of strut-type energy absorption as a method of attenuating crash forces.
- Military Aircraft Operations