PERFORMANCE TEST AND HYSTERESIS MODEL OF MR DAMPER WITH BIDIRECTIONAL ADJUSTING DAMPING FORCE

Based on the conceptual design and theoretical analysis, four models of the magnetorheological (MR) damper with bidirectional adjusting damping force are fabricated. The distribution of magnetic field in the damping tunnel is examined, and the performance curves of force-displacement and force-velocity of the model dampers in different states of input current are tested. The dynamic hysteresis model of the model damper is built through parameter identification of the improved Sigmoid model. It is shown that the structure of magnetic circuit of the model dampers may achieve bidirectional adjustment of the damping force well, and the distribution of magnetic field in the damping tunnel meets the design requirement in the main. The model dampers may generate the medium, maximum and minimum outputs in the states of the zero, maximum positive and minimum negative input current respectively, and the medium output in the state of zero current may ensure the fail-safe property of the dampers and prevent the settling of the MR fluid. The hysteresis model built is simple, practical and precise.