Title: FULL-SCALE EXPERIMENTAL VERIFICATION OF SEMI-ACTIVE CONTROL ON CABLE -MR DAMPER SYSTEM
Abstract: Mechanical dampers have been proved to be one of the most effective countermeasures for vibration mitigation of stay cables in various cable-stayed bridges over the world. However, for long stay cables, as the installation height of the damper is restricted due to the aesthetic concern, using passive dampers alone may not satisfy the control requirement of the stay cables. Therefore, semi-active MR dampers have been proposed for the vibration mitigation of long stay cables. However, the highly nonlinear feature of the MR damper leads 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. Simulation study has previously been carried out for the cable-MR damper system using a semi-active control algorithm based on the universal design curve of dampers and a bilinear mechanical model of the MR damper. This paper aims to verify the effectiveness of MR damper using the same approaches as in the simulation study for vibration mitigation of stay cable by full-scale experimental test. A long stay cable fabricated for a real bridge was set-up with MR damper installed. The cable was excited under free vibrations. Different test scenarios were considered where the MR damper was tuned as passive damper with minimum or maximum input current, or the input current of the damper was changed according to the proposed semi-active control algorithm. The effectiveness of the MR damper for controlling the cable vibration was assessed through computing the damping ratio of the cable for free vibration and the root mean square value of acceleration of the cable for forced vibration.
Publication Year: 2013
Publication Date: 2013-09-11
Language: en
Type: article
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