Abstract
We have developed a new soundproof system which is installed additionally on existing railway concrete viaducts to make them higher considerably. 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 by rotating shafts and fixed by magnetic force at its bottom. In this study, the magnetic force was treated as a non-linear spring and frequency response analysis was conducted with a finite element method. As a result, the vibration mode in the analysis approximately agreed with that of impact test with an impulse hammer. Furthermore, vibration response of the current type of soundproof plate was compared to the new one and it was recognized that both were different.
