125 高速列車が明かり区間を通過する際に発生する低周波音(低周波・超低周波音(2),騒音・振動評価・改善技術)

概要

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It is reported that not only an audible noise but also a low-frequency noise is radiated from a high-speed train toward a way-side area in an open section. The observed the low-frequency noise, which is defined here as the noise of below 80Hz including the infrasound of below 20Hz, consists of hydrodynamic pressure variation around the nose and tail part of the train and low-frequency acoustic pressure wave by aerodynamic sound sources around the train as well as vibrating surfaces of a viaduct structure. We use an acronym PF (Pressure Field) for the former phenomenon, and PW (Pressure Wave) for the latter. In the past, we measured the wayside low-frequency noise in a fully open section, however the causes of the PW still remained to be fully clarified due to lack of sufficient data. Hence, we have measured the PW in the wide range of the train speed of 150〜400km/h. From the obtained characteristics of spectra, distance attenuation and velocity dependency, the major component of the PW in the far field is found to be aerodynamic sound emitted from the train, in a high-speed region of over 350km/h.
社団法人日本機械学会の論文
2006-07-11