In the structure with long-span slabs or in near transportation facilities, the reduction of the vertical vibration is an important for a view point of habitability, comfortableness or usability. In former case, it will be an efficient method to place a mass damper system on the slab or the floor for attenuating of the vibration. However, the discrepancy of each natural frequency is a problem in a TMD. On the other hand, the cost performance is a problem in an AMD, although the vibration control effect is improved. This study has investigated the variable damping type mass damper using the erectro-rheorogical fluid (ERMD). The dynamic tests for investigating the damper characteristics the have already been carried out in various electric fields, frequency and displacement. In this paper, the dynamic analytical model for the damping force characteristics of ERMD is examined by using the revision type bi-linear model. The vibration control performance is investigated though the time response analysis and teh vibration tests using the beam-structure model. As a result, the dynamic analytical model is possible to express the voltage and displacement dependency in detail. Moreover, the stable vibration control performance was obtained by the semi-active control in the time response analysis. In the vibration tests, the maximum reponse of displacement in beam was reduced about 1/4 at control.
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