可動部を有する透光型遮音板の列車走行音に対する防音性能評価

抄録

Sound insulation plate made of transparent polycarbonate are installed on existing concrete noise barriers to achieve higher noise reduction. However, it is almost impossible to install higher noise barrier without reinforcing the viaduct sufficiently because of wind load increase. Therefore, the authors have proposed a novel noise barrier, sound insulation plate of which can reduce wind load with hinge mechanism. In this paper, noise insulation performance of the novel noise barrier as insertion loss was evaluated in rail line. And acoustic analysis by finite element method in frequency domains was conducted to inspect the applicability for noise reduction estimation. Then the measured insertion loss shows no sound leakage from the clearance of sound insulation plate and the numerical results shows that it is applicable to visualize the distribution of sound transmission and estimate the sound reduction effect according to the noise barrier height.