The submerged structural members in the tank of large tankers undergo very complex local vibrations in cargo and other liquids. It is believed that such local vibrations are one of the principal causes of the cracks of the relevant structures. The authors analyzed, applying the Ritz's technique, lateral vibration of the deep girder in the cargo tank and vibration of the open floor in the aft-peak tank. The hydrodynamic inertia, or added mass, of water surrounding the deep girder was determined by the two-dimensional finite element method which incorporates the source-sink technique and corrected for the effect of three-dimensional flow by the simplified calculation. Vibration of the open floor was studied using the Ritz's technique with consideration towards the added mass. For both deep girder and open floor, frequencies calculated were found to agree with the frequencies measured in large tankers with an error of about 10% and to decrease in water to the level where they would synchronize with the propeller-blade frequency.

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  • Corporate Authors:

    Mitsubishi Heavy Industries Limited

    5-1 Marunouchi, 2-chome, Chiyoda-Ku
    Tokyo 100,   Japan 
  • Authors:
    • Ohnuma, S
    • Nagamoto, R
    • Ushijima, M
  • Publication Date: 1973-6

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Filing Info

  • Accession Number: 00057193
  • Record Type: Publication
  • Source Agency: Mitsubishi Heavy Industries Limited
  • Files: TRIS
  • Created Date: Jul 31 1974 12:00AM