Vibration Control of Structural Systems using MR dampers and a `Modified' Sliding Mode Control Technique

Magnetorheological (MR) dampers are easily controlled by appropriately regulating the current through an electromagnet producing the necessary magnetic field across the fluid; thus they can be utilized in applying advanced nonlinear control strategies aimed at vibration suppression problems. Since most MR dampers are passive (i.e., they are dissipative and do not produce motion) modern nonlinear control schemes must be significantly modified before they can be employed. This study presents the theoretical development of a modified nonlinear control methodology for MR dampers applied to typical vibration control problems. The methodology is applied to single and multiple DOF systems. The case when only one measurement sensor is used in a quarter-car model is also analyzed using a classical observer design. Simulated and experimental results show the effectiveness of the methodology in controlling the vibration of a general vibratory system.

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