Phenomenological Model for Magnetorheological Dampers

TLDR

MR dampers are semiactive control devices that use MR fluids to provide adaptable, reliable, fail‑safe damping without large power sources. The authors aim to develop control algorithms that exploit the unique features of MR dampers. They propose a new model, derived after reviewing idealized mechanical models, that captures the damper’s intrinsic nonlinear behavior. Experimental comparison shows the model accurately predicts damper behavior across a wide range of conditions and is suitable for control design and analysis.

Abstract

Semiactive control devices have received significant attention in recent years because they offer the adaptability of active control devices without requiring the associated large power sources. Magnetorheological (MR) dampers are semiactive control devices that use MR fluids to produce controllable dampers. They potentially offer highly reliable operation and can be viewed as fail-safe in that they become passive dampers should the control hardware malfunction. To develop control algorithms that take full advantage of the unique features of the MR damper, models must be developed that can adequately characterize the damper's intrinsic nonlinear behavior. Following a review of several idealized mechanical models for controllable fluid dampers, a new model is proposed that can effectively portray the behavior of a typical MR damper. Comparison with experimental results for a prototype damper indicates that the model is accurate over a wide range of operating conditions and is adequate for control design and analysis.