MOTIONS AND LOADS ON SHIP MODELS IN REGULAR OBLIQUE WAVES

The prediction of ship motions and loads in a seaway is first discussed in general terms, and the recent history of model experiments in waves is outlined. New theoretical methods of predicting the motions and loads experienced in oblique waves must be verified by comparison with the results of model tests, but most published results have insufficient detail for such verification by independent workers. In this account of tests on a model of a warship for which trial results were available, the Authors (of the Admiralty Marine Technology Establishment, Haslar and Dunfermline) have provided detailed information so that the results should be adequate for use by the ship research community. The work is the outcome of discussions within the Ship Structure/Hydrodynamics Liaison Group, whose members are drawn from the MTF and several other organisations (including B.S.R.A.). The model used in these experiments, which were carried out in the AMTE manoeuvring tank at Haslar, is described in particular detail. It was divided into four sections by transverse cuts at three stations; the sections were joined by means of strain-gauged dynamometers to enable bending moments, torsional moments, and shear forces to be measured at the three stations. Pitch, heave, relative bow motion, roll, yaw, and rudder motions were also measured. The model was run over a wide range of headings and wave-lengths at two speeds to determine the loads at the three stations, together with the gross hull-motions. Complete results will be published in an R.I.N.A. Occasional Publication; the present paper includes a small proportion of the results, giving their salient features and comparing them with predictions given by a number of published theories and computer programs. These comparisons show that vertical plane motions and loads are, in general, reasonably well predicted at all headings. Lateral plane motions and loads are less well predicted; predictions of torsional moments are very poor, a matter requiring urgent attention.

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/03060209
• Supplemental Notes:
  • This paper was presented at an R.I.N.A. meeting in April 1979.
• Corporate Authors:

  Royal Institution of Naval Architects

  10 Upper Belgrave Street
  ,   United States 
• Authors:
  • Lloyd, ARJM
• Publication Date: 1980-1

Media Info

• Features: References;
• Pagination: p. 21
• Serial:
  • Naval Architect
  • ISSN: 0306-0209

Subject/Index Terms

• TRT Terms: Bending moments; Equipment tests; Loads; Moments (Mechanics); Ship motion; Ships; Structural models; Tanks (Containers); Torsion; Water waves
• Uncontrolled Terms: Ship models
• Old TRIS Terms: Model testing; Shear loads; Tank testing; Torsional moment; Wave loads
• Subject Areas: Bridges and other structures; Hydraulics and Hydrology; Marine Transportation; Vehicles and Equipment;

Filing Info

• Accession Number: 00314983
• Record Type: Publication
• Source Agency: British Ship Research Association
• Report/Paper Numbers: Technical Papers
• Files: TRIS
• Created Date: Aug 27 1980 12:00AM