抄録
This report presents aeroacoustic characteristics of measured aerodynamic sounds radiated from simplified models on a flat base. The simplified models consist of a hemisphere, spheroid, half hemisphere and elongated hemisphere with an inserted half cylinder as an intermediate part of the hemisphere. An important purpose of these test models is to provide acoustic data which can be used to survey the aerodynamic noise from the upper parts of train front. An installation called the Maibara wind tunnel was used for experimental tests. As the results of analysis on the measured sound pressure from the test models, it is confirmed that a moving body which has an effectively smoothed and streamlined front shape can sufficiently decrease the aerodynamic noise generated from the upper parts even if its running speed reaches 350 km/h.
