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Title |
A Design and Performance Evaluation of Semi-active MR Damper for the Smart Control of Construction Structures
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Keywords |
감쇠성능 ; 감쇠력 ; 동적범위 ; 갭 효과 ; MR감쇠기 ; 준능동 제어 Damping performance ; Damping force ; Dynamic range ; Gap effect ; MR damper ; Semi-active control |
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Abstract |
This research developed two semi-active MR dampers whose gaps in the orifice area were different from each other, and evaluated their damping performance by loading tests. The Damping performance of MR dampers characteristically depends on various factors like their material and mechanical ones, but most importantly on the size of gap in the orifice area. For this research, we designed the orifice gaps of two dampers as each 1.0mm and 2.0mm, both with the 80mm outer diameter of the orifice. We also designed two loading test sets with different input currents, and acquired different control ability from them. The acquired test results were analyzed and evaluated with their maximum and minimum damping force and also their dynamic range from the force-displacement hysteresis loops and the force-input current relationship curve. This research clearly proved how the damping performance of control devices depends on the gap effect, and also presented a possibility that the two dampers developed in this research could be used for the smart control of construction structures by effectively adapting the input current and the number of coil turns.
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