Comparison of Linear, Nonlinear, Hysteretic, and Probabilistic Models for Magnetorheological Fluid Dampers

摘要

Magnetorheological (MR) fluid dampers have a semicontrollable damping force outputnthat is dependent on the current input to the damper, as well as the relative velocity. Thenmechanical construction, fluid properties, and embedded electromagnet result in a dynamicndamper response. This study evaluates four modeling approaches with respect tonpredicting the multi-input single-output behavior of an experimental MR damper whennthe inputs are band-limited random signals typically encountered in primary suspensionnapplications. The first two models in this study are static in the sense that there is anunique output for any given set of inputs and no dynamics is present in either model. Thenthird model incorporates a dynamic filter with the nonlinear model to exhibit hystereticneffects, which are known to exist in actual MR dampers. The fourth model is probabilisticnand illustrates the dynamic nature of an actual MR damper. The results of this studynclearly show the importance of nonlinear and dynamic effects in magnetorheologicalndamper response. This study also highlights the importance of characterizing magnetorheologicalndampers using excitation signals that are representative of an actualnimplementation.