This study aims to get a deep insight of the inherent hysteresis behavior of magnetorheological fluid dampers and to develop the method of designing such hysteresis. Taking into account the compressibility of magnetorheological fluid, a physical model of magnetorheological dampers is developed by establishing the flow rate equations for two chambers. The model is validated by a set of the experimental data from a literature. As a special case of the proposed physical model, a lumped parameter physical model which can explain the hysteresis in a more straightforward way is derived and validated too. The fact that the viscous force can be ignored compared to the Coulomb force reduces the lumped parameter physical model to its simplest form, that is, a friction element representing the Coulomb force is connected in series with a spring element representing the compressibility of fluid. It is this simple two-element physical model that captures the essence of the hysteresis behavior, on the basis of which, the mechanism of the hysteresis generation is explored in great detail, and the formula is also derived for calculating the hysteresis width. Finally, the design method of the hysteresis behavior is illustrated by a specific example.
This paper presents a novel magnetorheological (MR) damper with a self-powered capability, which is proposed to have energy harvesting and MR damping technologies integrated into a single device. Vibration energy harvesting mechanisms were adopted, based on ball-screw mechanisms and a rotary permanent magnet dc generator, to convert the external vibration energy into electrical energy to power the MR damping unit. The configuration and operating principles of the proposed self-powered MR damper were presented. Considering the core loss effect on the magnetic field, a theoretical analysis of the proposed MR damper was carried out and a mechanical model was developed. Finally, a prototype with a capacity of 10 kN was fabricated and experimentally investigated in both the direct-supply mode and the supply-withrectifier mode. The results indicated that the proposed configuration is feasible and that both modes can realize good self-adaptability of the MR damping force. However, the direct-supply mode has a sag effect in the force-displacement curve and provides a lower energy-dissipating capacity than the direct-supply mode does under the same conditions.
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