Miscellaneous |
 
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Miscellaneous |
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Note that the vessel heading is the angle, in degrees, between the instantaneous local vessel surge axis and the line defining the direction of the wave incident on the vessel, as defined in Definition of Wave Heading Used In Flexcom figure. Vessel heading must be defined in the range ±180°.
The RAOs for the three displacements (heave, surge and sway) are input in terms of displacement amplitude per unit wave amplitude. For yaw, roll and pitch, the inputs are in degrees per unit wave amplitude.
In general, when performing an analysis where RAOs are specified as a function of wave heading, it is always recommended when postprocessing the results that you plot timetraces of the motions of the node(s) attached to floating vessels. In this way you can ensure that the RAO specification did in fact lead to the expected vessel motions.