Adaptive Seat Energy Absorbers for Enhanced Crash Safety: Technology Demonstration

Report No. ARL-TR-7743
Authors: Gregory J Hiemenz; Muthuvel Murugan; Wei Hu; Norman M Wereley; JinHyeong Yoo
Date/Pages: August 2016; 126 pages
Abstract: This research program is intended to design, assemble, and test, both at a component and assembly level, adaptive seat energy absorber (ASEA) technology to retrofit a rotorcraft crew seat. Two adaptive energy absorber (EA) technologies were developed in this research program: 1) rotary magnetorheological EA with magnetic bias and 2) magnetostrictive friction EA. The results of the evaluation of these adaptive seat EA technologies for rotorcraft crashworthiness and safety enhancement are summarized in this report. The low speed crash dynamic sled tests conducted showed great promise for the ASEA technology, with occupant compressive lumbar loads measured to be more than 32% lower than published data for the baseline MH-60R seat with conventional EAs. Moreover, the ASEA used substantially less stroke than the baseline seat, showing that the ASEA can be much more efficient.
Distribution: Approved for public release
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Last Update / Reviewed: August 1, 2016