鉄道車輪-レール系の転動音に関する基礎的研究

抄録

The rolling noise of the wheel/rail system of a railway vehicle was investigated. First, the coupled vertical vibrations between a rail and a wheel were analyzed, regarding the rail as an infinitely long beam installed on an viscoelastic foundation and the wheel as a point mass. The surface roughness of the rail was considered and the contact characteristic between a rail and a wheel was linearized by using the equivalent linearization method. And by obtaining the frequency response functions for the rail and the wheel, those vertical vibrations were calculated. Then, on the basis of the acoustic model that the point sources are infinitely arrayed on the top and the lower part of the rail, the sound generated from the rail was calculated. The trend of the theoretical results for the sound pressure level agreed with the experimental results using the Shinkansen and the hypothesis that the main source of the rolling noise is the rail was ascertained.