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Meeting	ACGS Committee Meeting 112 - Annapolis, Maryland - October 2013
Agenda Location	8 SUBCOMMITTEE D – DYNAMICS, COMPUTATIONS, AND ANALYSIS 8.3 Adaptive Energy Absorption for Occupant Protection in Aircraft and Automobiles
Title	Adaptive Energy Absorption for Occupant Protection in Aircraft and Automobiles
Presenter	Norm Wereley
Affiliation	University of Maryland
Available Downloads*	presentation
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Abstract	Adaptive Energy Absorption Systems For Occupant Protection Systems in Aircraft and Automobiles Norman M. Wereley, Ph.D. Minta Martin Professor and Chair Dept. of Aerospace Engineering , University of Maryland College Park MD 20742 USA wereley@umd.edu Abstract: The ability to dissipate energy in vehicle systems, especially with the goal of protecting occupants and payloads from potentially injurious vibration, repetitive shock, crash and blast loads, is becoming a critical issue as the cumulative impact of these load spectra on chronic health and acute injury are becoming better understood. Energy is dissipated utilizing a stroking element, such as a hydraulic damper or energy absorber. However, it is difficult to anticipate precisely what range of payload or occupant mass an isolation system might be expected to protect, or what vibration and shock spectra the system might encounter. Therefore, adaptation of stroking load is required to enable a system to have sufficient adjustability or control capability to effectively dissipate energy across a wide range of anticipated and even unanticipated disturbances. The goals of my research are threefold: (1) to develop field dependent or controllable energy absorbing materials, especially magnetorheological (MR) fluids, (2) to develop magnetorheological energy absorbers (MREAs) to enable adaptation of stroking load to optimally control stroke and load, and (3) to protect payloads or occupants from a wide range of vibration and shock spectra, as well as to accommodate a range of payload or occupant mass. Applications to crew seating in rotorcraft, aircraft, ground vehicles, as well as landing gear, will be discussed.