Abstract
In this study, a compressible magneto-rheological fluid damper – liquid spring (CMRFD-LS) system is designed, built and tested. The CMRFD-LS functions as a liquid spring and a controllable fluid damper in a single unit. The CMRFD-LS system has a Magneto-Rheolgical (MR) valve with tapered annular flow channel. The flow profile and pressure drops due to varying cross sections of the flow path under different applied magnetic fields are studied. To evaluate the spring effect, experiments are carried out using pure silicone oil under different input displacements and frequencies. The spring effect of the liquid spring and the energy dissipated due to damping are obtained from the performance tests conducted with MR fluid, which is composed of 80% (wt.) iron particles suspended in silicone oil. The equivalent spring coefficient, equivalent damping coefficients and energy dissipated for different sinusoidal input displacements at different motion frequencies and applied electric currents are determined from these force-displacement loops of experimental results. The effect of the tapered flow path on the pressure drops for compression and rebound is investigated.
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