17 April 2013 Adaptive magnetorheological seat suspension for shock mitigation
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An adaptive magnetorheological seat suspension (AMSS) was analyzed for optimal protection of occupants from shock loads caused by the impact of a helicopter with the ground. The AMSS system consists of an adaptive linear stroke magnetorheological shock absorber (MRSA) integrated into the seat structure of a helicopter. The MRSA provides a large controllability yield force to accommodate a wide spectrum for shock mitigation. A multiple degrees-of-freedom nonlinear biodynamic model for a 50th percentile male occupant was integrated with the dynamics of MRSA and the governing equations of motion were investigated theoretically. The load-stroke profile of MRSA was optimized with the goal of minimizing the potential for injuries. The MRSA yield force and the shock absorber stroke limitations were the most crucial parameters for improved biodynamic response mitigation. An assessment of injuries based on established injury criteria for different body parts was carried out.
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Harinder J. Singh, Harinder J. Singh, Norman M. Wereley, Norman M. Wereley, "Adaptive magnetorheological seat suspension for shock mitigation", Proc. SPIE 8690, Industrial and Commercial Applications of Smart Structures Technologies 2013, 86900A (17 April 2013); doi: 10.1117/12.2012271; https://doi.org/10.1117/12.2012271

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