| 摘要 |
PURPOSE:To reduce the resonance frequency of a plate by putting additional mass such as a steel plate block closely by a permanent magnet on a vibrating plate. CONSTITUTION:A side board vibration prevention device 25 is provided on the vibrating part 13 between both the reinforcement beams 11 on the side board of a tank. The side board vibration prevention device 25 fixes additional mass 21 with a sheet 20 on the vibrating part 13 of a side board by a permanent magnet 22. An anticorrosive layer 23 is provided outside of the additional mass 21. Since the additional mass is put by the permanent magnet, when a transformer is completed, vibration prevention measures can be done simply at the time when a resonance is detected. |
