Abstract
The drift speed of a floating structure in a seaway appears to be a slowly varying function of time. If this structure is kept on station by means of anchor lines, the natural sway and surge periods of this mass-spring system are so large that it can be excited by the low-frequency drifting force, resulting in large motion amplitudes of the floater. The origin of the low-frequency drifting force is discussed and the functional relationship with characteristics of the sea is derived theoretically. The theoretical explanation is verified by model test results. An adequate agreement between theory and experiment is established.
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