As ships increase in size, the formulas previously used to describe ships' vibrations are being found to contain errors which are leading to expensive repairs and lost time. The article describes the various differences between the previous calculations used and the vibrations which are actually being found to occur. An analogy is made to electrical resonant circuits when dealing with mechanical vibrations. This analogy is used throughout the rest of the article to explain the various vibrations. The authors then describe the various resonators of forced vibrations appearing in the ship. The entire range of forced vibrations of the hull is then related to the free vibration of the ship when excited by the sea, with special regard to the effect of slamming on the hull girder. The fact that a calm sea can also cause damaging vibrations is also mentioned. In all cases the phenomena are illustrated by graphs and diagrams related to the electrical analogy, and methods for damping or eliminating the vibrations are suggested. The conclusion reached by the authors is that, as ships increase in size and speed the consideration of vibratory phenomena becomes increasingly important.

  • Availability:
  • Corporate Authors:

    International Periodical Press

    193 Heemraadssingel
    Rotterdam,   Netherlands 
  • Authors:
    • Bourceau, G
    • Volcy, G C
  • Publication Date: 1971-7

Media Info

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Filing Info

  • Accession Number: 00028765
  • Record Type: Publication
  • Source Agency: United States Merchant Marine Academy
  • Files: TRIS
  • Created Date: Mar 28 1972 12:00AM