The added resistance of a ship in a seaway is of great importance in design optimization. For power plant specifications a reliable estimate of the added resistance over the range of ship operating conditions is needed. In an investigation of the seakeeping performance of a transom stern containership, an attempt has been made to experimentally predict the added resistance in a seaway by obtaining an added resistance curve in regular waves. This curve is then used with a random sea spectrum to give a mean added resistance prediction in a seaway. This will be checked against experimental results in random seas. To aid experimentation in regular waves an electronic counting device is being developed to measure the resistance over an integral number of wave cycles. This device should eliminate over or under-predicting the regular wave added resistance. Current theory over-predicts added resistance for transom stern ships in a seaway by factors ranging from about two to four. The linearized ship theory gives good predictions for heaving, pitching, and phase angles, however. If lower added resistance in a seaway can be expected than is actually predicted, then significant power plant space and money can be saved in the design-construction-service cycle.

  • Supplemental Notes:
    • Presented at Meeting of New England Section of the Society of Naval Architects and Marine Engineers.
  • Corporate Authors:

    Society of Naval Architects and Marine Engineers

    601 Pavonia Avenue
    Jersey City, NJ  United States  07306-2907
  • Authors:
    • Oakes, M C
  • Publication Date: 1972-9

Media Info

  • Features: References;
  • Pagination: 43 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00044417
  • Record Type: Publication
  • Source Agency: Society of Naval Architects and Marine Engineers
  • Files: TRIS
  • Created Date: May 11 1973 12:00AM