SELECTION OF WAVE SPECTRA FOR USE IN SHIP DESIGN

The successful incorporation of seakeeping in the ship design cycle requires that the seaway in which the ship is to operate is described accurately for construction of a mathematical model to predict, inter alia, the wave loads the structure must withstand, the motions it will experience during its operation and the average speed it will be able to achieve. This paper reviews various methods for representing seaway characteristics and compares their validity in determining the responses of a destrover-type ship and a commercial ship. The use of spreading functions to describe short-crested storm seas is illustrated by reference to the long- and short-crested pitch responses of a Mariner-type ship. In a discussion of wave statistics, some criteria for distinguishing between sea and swell are considered and the design process for calculating significant roll is outlined. Seakeeping events such as shipping of green water, slamming and propeller racing are difficult to model; the paper reviews a number of studies of these phenomena and gives examples of the use of probability criteria in calculating ship's speed capability.

• Supplemental Notes:
  • Proceedings of International Symposium "WAVES 74" - Ocean Wave Measurement and Analysis, New Orleans, 9-11 Sept 1974.
• Corporate Authors:

  American Society of Civil Engineers

  345 East 47th Street
  New York, NY  United States  10017-2398
• Authors:
  • Chryssostomidis, C
  • Oakes, M C
• Publication Date: 1974-9

Media Info

• Features: References;
• Pagination: 18 p.

Subject/Index Terms

• TRT Terms: Electromagnetic spectrum; Force; Loads; Mathematical models; Seakeeping; Seas; Ship motion; Ships; Speed; Vehicle design; Water waves; Waves
• Uncontrolled Terms: Ship design
• Old TRIS Terms: Sea spectra; Ship speed prediction; Wave forces on structures; Wave loads
• Subject Areas: Design; Hydraulics and Hydrology; Marine Transportation; Vehicles and Equipment;

Filing Info

• Accession Number: 00152580
• Record Type: Publication
• Source Agency: ish Ship Research Association
• Report/Paper Numbers: Vol. II
• Files: TRIS
• Created Date: May 11 1977 12:00AM