SEA LOADS ON LARGE BUOYANT CARGO DURING OCEAN TRANSPORT

This paper presents a semi empirical procedure for the evaluation of sea loads on large buoyant cargoes during ocean transport by heavy lift ships. Theories and underlying assumptions used in the procedure are discussed. The procedure predicts kinematics of the cargo and waves, the occurrence of coupling between waves and cargo, and the coupling forces in time domain. Air gaps between the cargo and wave surface are traced on the basis of linear theories of ship motion and waved to detect the occurrence of couplings. The coupling process is then treated as a local problem in the sense that it does not affect overall ship motion. The coupling forces are assumed to be a linear sum of buoyancy, Froude-Krylov force, added mass, and drag. The first two components are computed in a nearly exact method, whereas the latter components are approximated by empirical equations. The slamming force, which occurs only briefly at the moment of water entry, is computed separately. The required force coefficients are determined empirically. The underlying assumptions, are verified with hydraulic model measurements, the results of which confirm the approach for engineering applications.

• Supplemental Notes:
  • Ocean Engng, v 20 n 5, Sept 1993, p 509 [19 p, 14 ref, 2 tab, 16 fig]
• Authors:
  • Huang, E T
  • Pauling, J R
• Publication Date: 1993

Language

• English

Subject/Index Terms

• TRT Terms: Heavy lift shipping; Loads; Seakeeping; Water waves
• Old TRIS Terms: Wave loads
• Subject Areas: Hydraulics and Hydrology; Marine Transportation;

Filing Info

• Accession Number: 00706296
• Record Type: Publication
• Source Agency: British Maritime Technology
• Files: TRIS
• Created Date: Aug 14 1995 12:00AM