Effect of Crash Pulse Shape on Scat Stroke Requirements for Limiting Loads on Occupants of Aircraft

this paper is x 23.562(7) which states, "The compression load measured between the pelvis and lumbar spine of the ATD may not exceed 1500 pounds." (ATD designates anthropomorphic test dummy.) As noted in reference 15, experimental crush data for vertebrae (T8 through T12 and L1 through L5) i ndicate that the crushing force ranged from slightly over 1300 to 2360 lb . The T9 thoracic vertebrae of the spine (carrying 60 l b which is the estimated upper body weight of a 50-percentile man) was crushed at approximately 1500 lb . Based upon this and other considerations (for example, ref. 16), the criterion became 1500 lb . Since the regulations in Part 23 do not specify any particular pulse shape to achieve the required magnitudes and durations of the seat loadings i n a laboratory environment, the purpose of this paper is to (1) provide comparative information for various pulse shapes that potentially could be used to test seats to meet the regulation , (2) show the effects that crash pulse shape can have on the seat stroke requirements necessary to maintain a specified limit loading on the seat/occupant under variou