Time Delay Study on the Semi-Active Control with a Magnetorheological Damper

Abstract eng:
The semi-active control with the advantages of both passive control and active control has been shown to be a promising strategy in mitigating seismic responses for isolated structures. A Magnetorheological (MR) damper is one of the smart semi-active devices which have been developed and studied recently. The damping force exerted from MR dampers can be regulated easily by changing the current input. Although the past researches have revealed that MR dampers in semi-active control systems are capable of mitigating seismic hazard, analytically and experimentally, it is inevitable that time delay may decrease the control performance of the semi-active control system. The time-delay effect of an isolated bridge under semi-active control with a MR damper controlled by sliding mode control is studied in this paper. A target structure is analyzed under a typical near-field ground motion recorded in the Chi-Chi earthquake to evaluate effect of the time delay and the time delay compensation method. The numerical analytical results reveal that the time-delay deteriorates the control performance. A time-delay compensation method based on Newmark’s integration method is adopted to mitigate such an effect. Through numerical simulation the compensation method shows a satisfactory performance of decreasing the time-delay effect in the semi-active control system by using a MR damper with the sliding mode control.

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