19th Asia-Pacific Vibration Conference (APVC2021)

81 / 2021-03-30 07:09:35

Analysis and tests of magnetorheological adaptive shock mitigation system

Magnetorheological energy absorber,Shock mitigation,Nonlinear model,Control algorithm

Optimal shock mitigation shows great engineering potential, e.g., suspension systems of special vehicles and seats, spacecraft landing gears, vehicle frontal impact energy absorption systems, and artillery/machine gun recoil devices, etc. In this paper, with the objectives of maximizing usage of the piston stroking and zeroing final velocity of the piston, a shock mitigation control algorithm for magnetorheological energy absorber (MREA) based drop-induced shock mitigation system is theoretically and experimentally studied. A double-rod MREA with a large dynamic and controllable velocity range is designed and manufactured. The mechanical model of the MREA based on the (Resistor-Capacitor) RC operator hysteresis model and Bingham model are respectively established. Then, the dynamic model of the drop-induced shock mitigation system with the MREA is given. Finally, dynamic responses of the MREA under the drop-induced shock excitation are analyzed and tested, to evaluate the control strategies and nonlinear models of the MREA.