High Vibration on Hydroelectric Head-gate Hoist during Commissioning

  • By Ken Keith
  • one year ago
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During commissioning of a new headgate hoist, high vibration levels were noted on the fan break bearings during emergency drop. The vibration levels were significantly higher than those measured during the factory acceptance test (FAT). In depth measurements indicated higher than expected running speeds leading to excitation of shaft critical speed in additional to possible structural resonance. A detailed analysis will be presented on the vibration measurements and the findings including assembly issues of the entire hoist.