Effect of Pulse Separation on Subject Response Using a Dynamic Preload Device

摘要

The maximum safety factor in the operation of a manned escape system is achievedwhen the system is ejected from the cockpit as rapidly as possible in order to clear the empennage of the aircraft. However, physiological limitations associated with spinal loads on the occupant dictate an upper bound on the acceleration levels of the escape system. The optimum acceleration-time history of the escape system is that time history which leads to maximum escape velocity and escape distance achievable within the acceleration limits allowable on the occupant. Twenty-eight fully instrumented tests were conducted using the Vertical Deceleration Tower modified to incorporate a dynamic preload device. Analysis of the data and computer simulations showed that use of dynamic preload could provide an ejection seat with a much greater escape displacement in a given time interval than would be the case if no dynamic preload were used for the same allowable value of the Dynamic Response Index. The tests were conducted using the large Advanced Dynamic Anthropomorphic Manikin (ADAM) as a test subject.