Full-Size Model of Shinkansen and Sound Proofing Walls Tested Noise Decreasing Effect of Developed Noise Absorbing Material

Considering speed increase in the future, noise prevention is a major issue for railway enterprises. In general, railway enterprises build higher sound proofing walls as a countermeasure to increased noise. However, wall height is restricted due to external load. Thus railway noise countermeasure is noise absorbing material applied to sound proofing walls on viaducts and upper shape of existing sound proofing wall. In this paper we propose a method to derive noise absorbing material and noise absorbing device. To develop the countermeasure against the noise caused by high-speed-train, we constructed the 1/1 scaled model of viaduct and train mocking Shinkansen. The noise absorbing material applied to sound proofing walls. We tested variety of four type noise absorbing material, to find out the highest sound-absorbing effect. typeA: Made of the polyester, thickness of 50mm (conventional type) typeB: Made of the polyester, thickness of 100mm typeC : Made of the High-density polyester, thickness of 100mm typeD : Made of the polyester (high frequency sound measure), thickness of 50mm As a result, typeC noise absorbing material was the highest sound-absorbing effect of the four. In Conclusions, We did full-scale model experiment, to find out noise decreasing effect of developed noise absorbing material.