Abstract
The characteristics of the low-frequency pressure waves radiated from a train passing a viaduct of Shinkansen were examined through field measurement based on the manual for measuring low-frequency noise issued by the Ministry of the Environment in October 2000, by using a low-frequency sound level meter (NA-18 A) manufactured by Rion Co., Ltd. The measurement proved that the low-frequency noise consisted of a hydrodynamic pressure field and an acoustic pressure wave. The hydrodynamic pressure field is called train passing pseudo-sound and the acoustic pressure wave is called low-frequency pressure wave. The low-frequency pressure wave is seemingly emitted from a line source. The low-frequency wave is also proportional to the 4-5 th power of train velocity and approximately to the 1 st power of the distance from the source to the observation point.
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