Abstract
We have developed a new soundproof system which is installed additionally on existing railway concrete viaducts. This system is effective in decreasing the noise caused by the running of a train and can reduce wind load transmitted to the viaduct because of a movable soundproof plate of the system under a strong wind condition. In this system, the soundproof plate is supported on rotating shafts on the both sides of the plate. It is effective to set the axis position near the center of the plate in height direction so that the plate can return to the original position soon after the wind weakens. In this study, the influence of the axis position was investigated in a wind tunnel test. Furthermore, the drag coefficient applied to the model was determined experimentally.
