Abstract
This paper deals with motion characteristics of crane vessels in lifting operation. Emphasis is laid here especially on the effect of coupled motion between a vessel and hook load. Linear equations for calculating motions of 8 degrees of freedom are derived. Results of calculation of motion responses in regular waves are shown to be in good agreement with those of experiments carried out on a scale model of an actual crane barge. Calculation of motion responses of a few types of crane vessels in irregular waves and a trial estimation of workability thereof are presented to show the influence of the coupled motion effect on performance of crane vessels in actual sea area.
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