Vibration Mitigation of Stay Cable using Optimally Tuned MR damper based on Frictional Equivalent Model

Magnetorheological (MR) damper has been proved to be one of the most effective Semi-active control devices for the vibration mitigation of stay cables in various cable-stayed bridges. However, the highly nonlinear feature of the MR damper lead to a relatively complex representation of its mathematical model, and makes it difficult to be applied to suppress cable vibration with an efficient control algorithm. Therefore, this paper aims to develop a simplified mathematical model for the MR damper with less parameters involved, and to propose a semi-active control strategy using the universal design curves of nonlinear dampers model for the vibration control of stay cables. Theoretical analysis and simulation studies will be carried out to evaluate the performance of the cable-MR damper system and the efficiency of the proposed semi-active control strategy.