Abstract
Noise Insulator for Rail Joint termed as NIRJ has been developed by RTRI. Noise reduction effect of NIRJ was evaluated by verification test conducted for glued-insulated joint in commercial line. On the test, in addition to evaluation of noise reduction effect of NIRJ, comparison of noise of ordinary rail with rail joint, and evaluation of noise reduction effect due to rail grinding were also conducted. Consequently, we confirmed t!lat the countermeasure for noise at trailer passage was necessary as well as countermeasure n)r noise at motorcar passage at rail joint, since the noise level is not so much of between trailer passage and motorcar passage at rail joint. Although noise level at a rail joint is higher than that at away from rail joints by approximately 3dB, noise level was reduced approximately 2dB by, rail grinding. In addition, by installation of NIRJ, the noise level at a rail joint was reduced to only l〜2dB higher than that at away from rail joints.
