Vessel and Harmonic Loads |
 
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Vessel and Harmonic Loads |
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Vessel and harmonic loads are only applicable to frequency domain analysis.
Vessel loads are used to specify frequency-dependent loads, for example, the variation in top tension of a riser connected to a TLP. They are specified in terms of a point of application (node), direction and a load RAO definition. Vessel loads can be used with constant point loads – in which case the constant load (applied at all frequencies) is added to the vessel load at each particular frequency.
Harmonics loads define sinusoidally varying point loads, and are only applicable in a frequency domain regular wave analysis. They are specified in terms of a point of application (node), direction, amplitude and phase. The harmonic load has the same period as the analysis regular wave, or waves in the case of many regular wave analyses.
•*LOAD is used to define arbitrary loading. Specifically, the TYPE=VESSEL input is used to define vessel loads, while the TYPE=HARMONIC input is used to define harmonic loads.