Oscillational noise has frequently been observed by pop-up ocean bottom seismometers (OBS). The major cause of the noise is supposed to be bottom currents. When the relationship between current speed and shape of the OBS was examined experimentally, Karman vortexes were found to develop about the L-shaped frames, the pressure case of the radio transmitter and the antenna of the transmitter when the current exceeded 20 cm/sec. The Karman vortexes which formed about the antenna were found to be the most undesirable. The frequency of the antenna oscillation was from 3.20 to 3.70 Hz for current speeds of 18 cm/sec and 30 cm/sec, and the amplitude was large enough to saturate the seismometers in the OBS. The frequency was nearly equal to the resonance frequency of the antenna in air and half of the excitation frequency of the Karman vortex. This suggests that the oscillation is the result of resonance in the antenna due to an external force. The use of a fin was effective in reducing the oscillation.
雑誌名
東京大學地震研究所彙報 = Bulletin of the Earthquake Research Institute, University of Tokyo
巻
55
号
1
ページ
169 - 182
発行年
1980-08-25
ISSN
00408972
書誌レコードID
AN00162258
フォーマット
application/pdf
日本十進分類法
453
出版者
東京大学地震研究所
出版者別名
Earthquake Research Institute, University of Tokyo
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底層流による海底地震計周囲の渦の発生の実験的観察
ji0551008.pdf
(1.85MB)
