Adaptive Energy Absorbers for Drop-induced Shock Mitigation

作者：Wereley Norman M^*; Choi Young Tai; Singh Harinder J

来源：Journal of Intelligent Material Systems and Structures, 2011, 22(6): 515-519.

DOI：10.1177/1045389X10393767

• magnetorheological fluids
• magnetorheological damper
• energy absorber
• impact damper
• optimal control
• Bingham number

This study addresses the non-dimensional analysis of adaptive magnetorheological energy absorbers (MREAs) for drop-induced shock mitigation. The control objective to ensure that the payload mass comes to rest at the end of the available stroke of the MREA, that is, a 'soft landing.' The governing equation of motion of a single-degree-of-freedom system with an MREA was derived. The Bingham number was defined and its effect on the system response was examined. A comprehensive non-dimensional analysis was conducted using non-dimensional stroke, velocity and acceleration, where Bingham number and time constant were key parameters. An optimal Bingham number - based on drop velocity, payload mass, and passive damping - minimized the drop-induced shock loads transmitted to the payload by utilizing maximum damper stroke.

• 出版日期2011-4