The Proceedings of International Symposium on Seed-up and Service Technology for Railway and Maglev Systems : STECH
Online ISSN : 2424-3167
2015
Session ID : 1.00E+34
Conference information
1E34 Aerodynamic noise evaluation for high-speed trains by similarity law(Environment and Energy)
Akitoshi MatsuiToru WatanabeYukinobu Abe
Author information
CONFERENCE PROCEEDINGS RESTRICTED ACCESS

Details
Abstract
The objective of this research is to assess aerodynamic noise sources and the wind velocity conversion of the similarity law in increasing wind velocity. We measured the radiated aerodynamic noise from a cylinder with/without periodic holes and a pantograph with/without a sound insulating plate in the low noise high-speed wind tunnel. The background noise of the wind tunnel, at over 200km/h, becomes to be proportional to the eighth power of wind velocity from the sixth power. On the other hand, the noise level of the cylinder, up to 420km/h, is in proportion to the sixth power of the wind velocity, as dipole sound source. And the noise reduction effect of the change of the flow structure by periodic holes also continues. However, the noise level of the pantograph model with the sound insulating plate is in proportion to lower than the sixth power of wind velocity in contrast to the pantograph model itself. This causes that the noise reduction effect of the sound insulating plate is underestimated at the noise level conversion of wind velocity. These results show that the cylinders and the pantograph model increases still in proportion to the sixth power as dipole sound source. However, it is found that the noise level of objects with sound insulating structure is proportional to lower than the sixth power of wind velocity and there is a possibility that the estimated noise level by the wind velocity conversion is different from the actual noise level.
Content from these authors
© 2015 The Japan Society of Mechanical Engineers
Previous article Next article
feedback
Top