鉄道の曲線部におけるきしり音に関する検討

（各種パラメータによる傾向）

抄録

In order to obtain the data of curve squeal noise during a train running in a commercial line, the measurement field test was conducted. Sound pressure on both inner and outer sides of the railway curved track were measured with microphones. Laser displacement sensors were used for the measurement of wheel displacements in the lateral direction to estimate an attack angle of wheels. Through the measurements it is found that characteristics of curve squeal noise were different for each train. Even the characteristics did not coincide for each bogie of one train. This means that curve squeal noise does not occur stably. The main frequency of curve squeal in this measurement were 4 kHz or more. High frequency noise, that is a kind of curve squeal above 10 kHz, were seen in several trains. Relation between some parameters that can be associated with squeal noise and sound pressure level were investigated. High humidity can decrease the squeal noise. A certain range of running velocity of the bogie below balance speed at the curve makes the squeal noise greater in the frequency range of 7 kHz to 8 kHz. The squeal noise of inner rail side is greater that of outer rail side in this frequency and running velocity ranges. The greater attack angle also makes curve squeal greater.