Controllability of magnetorheological shock absorber: II. Testing and analysis

To specifically verify the application feasibility of the internal bypass magnetorheological shock absorber (MRSA) for high-speed shock mitigation systems, the controllability evaluation indexes of damping force controllability and real-time controllability of the developed internal bypass MRSA prototype are experimentally investigated in Part II of this paper. Using the self-developed drop-induced shock setup and servo-hydraulic testing machine at Hefei University of Technology, the damping force characteristics of the internal bypass MRSA, including the controllable damping force range, the dynamic range, and the constant stroking load velocity range, are tested under the high-speed impact and sinusoidal displacement excitations. The response time characteristics of the internal bypass MRSA prototype are tested under triangular displacement excitation on the servo-hydraulic testing machine, including the response times when the electromagnetic coil windings of the internal bypass MRSA energized by current driver and voltage driver. The controllability of the internal bypass MRSA for semi-active shock mitigation systems is further evaluated, analyzed, and discussed. (paper)