Forces and Moments on Ships to be Moored at Diego Garcia.
TAGGART (ROBERT) INC FAIRFAX VA
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The technique used to calculate wind forces and moments on a given ship is delineated in Chapter XII, Section 1 of the forthcoming book Ship Design and Construction . The pertinent material is reproduced in Appendix A of this report. Basically the abovewater area is divided into layers of equivalent area. A wind velocity profile is assumed wherein the velocity varies as the one-fifth power of the height above the surface of the water and the drag forces for a bow-on and for a beam-on wind are calculated. Multipliers, derived from past experience and model tests, are applied to these forces to derive the resultant forces and moments for winds acting at various angles from bow-on to stern-on. Current forces are also derived. The ships on which these calculations were made are the Maine Class RoRo merchant ships MarAd Designation C7-S-95a and the Challenger II Class General Cargo Ships MarAd Designation C4-S-64a.
- Marine Engineering