Host: The Japan Society of Mechanical Engineers
Name : [in Japanese]
Date : July 10, 2017 - July 12, 2017
In an open section without tunnels, pressure fluctuations are emitted from high-speed trains and railway structures. This pressure fluctuation is consisted of two components, i.e. the aerodynamic component which is generated from train vehicles and structure borne sound from railway structures. For the aerodynamic component, although vehicles except the leading and trailing cars could play a major role, their characteristics have not been clarified. In the present study, a field test was conducted in which low-frequency aerodynamic sound sources were identified. In addition, using a launching facility for train model, an experiment was carried out in order to simulate the field test and explore low-noise shapes. The field test using a linear microphone array clearly showed that more than 16 to 32 measurements of trains are required to identify the source precisely and that bogies and current collecting devices are major sources. The results obtained by launching experiment were consistent with those in the field test. Rounding cavity corner is supposed to be one of the reduction countermeasures for the low-frequency aerodynamic sound.
