110 レール防音材の材料構成の検討(新しい騒音・振動改善技術(3),騒音・振動評価・改善技術)

概要

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Recently in railway transport, the need for control of a rolling noise generated between wheel and rail is increasing, however, the conventional countermeasures such as sound-proof wall have a big problem that these need much labor to install, so it is eagerly requested to develop a new measure easy to install. Therefore, we have developed a new type of material named "Rail Noise Insulating Material (RNIM)". The first developed type is a laminated structure of foamed ethylene-propylene rubber and damping steel, and it has been confirmed to have an effect to reduce the rolling noise in the commercial line. However, it is also found out that the material cost must be reduced. So we have examined the better materials for inner and outer layer of RNIM, consequently six samples are selected. As the result of impact test for evaluating the properties of these six samples, it has been revealed that natural rubber is promising for inner layer, and normal steel for outer layer.
2007-07-18