چكيده به لاتين
This research presents new leverage system which increases displacement and velocity of dampers. The proposed system is composed of lever, linear spring, viscous damper and magnetorheological (MR) damper. The proposed mechanism increases force transferred to structure by using lever arm and improves damper efficacy. At first motion equation of the lever is derived and relations of the proposed mechanism are developed. Through numerical simulations, sensitivity of building responses by making change in parameters such as spring stiffness and viscous damping coefficient of the mechanism are discussed. Also, sensitivity of building in various frequencies with different amplification factors are presented. Proposed amplification mechanism is utilized in both linear seven-story building and nonlinear three-story benchmark building. For controlling the 7-story linear building, linear quadratic regulator (LQR) is used and simple adaptive control is proposed (SAC) for the nonlinear structure. Finally, it is observed that the proposed system is very appropriate for structures against earthquakes, even by using low-force control.
Keywords: Lever amplification mechanism, MR damper, Non-linear structure, LQR, Simple adaptive control method
