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Modal damping and stepping-switch control of stay cables with magnetorheological fluid dampers

Recent theoretical studies indicated that semi-active control using magnetorheological (MR) fluid dampers could provide better damping capability than viscous dampers for cable vibration mitigation. However, some challenging problems still remain in implementation of this smart damping technique to real engineering structures, e.g. how does the nonlinearity of MR dampers affect the system response? what are criteria of selecting MR damper size for an actual cable in design stage? which control strategies are cost effective and efficient for semi-active implementation? This paper tries to address these issues.