Variable Structure System Based Fuzzy Logic Control of Bridge Vibration Using Fail-Safe Magneto-Rheological Fluid Dampers

摘要

This paper presents a semi-active vibration control of a scaled two-span bridge structure. Magneto-rheological fluid (MRF) dampers are utilized as the semi-active energy absorbing devices and a bridge vibration control system is developed. Closed-loop control system based on fuzzy logic is used to suppress the bridge deck motion under random excitations. The sufficient condition for the closed-loop stability of the fuzzy control system is derived from the variable structure system (VSS) theory. It is demonstrated that this stable fuzzy control system can significantly reduce the relative deck displacement using about 55% less power compared to passive-on state, while the absolute deck acceleration is relatively unaffected.